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Update to 4.18.0-477.27.2.rt7.290.el8_8

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Andrew Lukoshko 2023-09-29 12:11:54 +00:00
parent 57fb2819f5
commit b1333d4a56
37 changed files with 4039 additions and 2 deletions
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243
SOURCES/1015-x86-microcode-intel-Expose-collect_cpu_info_early-fo.patch Normal file
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@ -0,0 +1,243 @@
From 38871bad2601515be96d1c3eb2ca1dbe2293bfff Mon Sep 17 00:00:00 2001
From: Jithu Joseph <jithu.joseph@intel.com>
Date: Fri, 6 May 2022 15:53:59 -0700
Subject: [PATCH 01/36] x86/microcode/intel: Expose collect_cpu_info_early()
for IFS
IFS is a CPU feature that allows a binary blob, similar to microcode,
to be loaded and consumed to perform low level validation of CPU
circuitry. In fact, it carries the same Processor Signature
(family/model/stepping) details that are contained in Intel microcode
blobs.
In support of an IFS driver to trigger loading, validation, and running
of these tests blobs, make the functionality of cpu_signatures_match()
and collect_cpu_info_early() available outside of the microcode driver.
Add an "intel_" prefix and drop the "_early" suffix from
collect_cpu_info_early() and EXPORT_SYMBOL_GPL() it. Add
declaration to x86 <asm/cpu.h>
Make cpu_signatures_match() an inline function in x86 <asm/cpu.h>,
and also give it an "intel_" prefix.
No functional change intended.
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Jithu Joseph <jithu.joseph@intel.com>
Co-developed-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20220506225410.1652287-2-tony.luck@intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
(cherry picked from commit d3287fb0d3c8afdfd4870a6cd4a852abc9008b3b)
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/include/asm/cpu.h | 19 +++++++++
arch/x86/kernel/cpu/intel.c | 32 +++++++++++++++
arch/x86/kernel/cpu/microcode/intel.c | 59 ++++-----------------------
3 files changed, 58 insertions(+), 52 deletions(-)
diff --git a/arch/x86/include/asm/cpu.h b/arch/x86/include/asm/cpu.h
index 21924730afae..2d62a3f122ee 100644
--- a/arch/x86/include/asm/cpu.h
+++ b/arch/x86/include/asm/cpu.h
@@ -73,4 +73,23 @@ static inline u8 get_this_hybrid_cpu_type(void)
return 0;
}
#endif
+
+struct ucode_cpu_info;
+
+int intel_cpu_collect_info(struct ucode_cpu_info *uci);
+
+static inline bool intel_cpu_signatures_match(unsigned int s1, unsigned int p1,
+ unsigned int s2, unsigned int p2)
+{
+ if (s1 != s2)
+ return false;
+
+ /* Processor flags are either both 0 ... */
+ if (!p1 && !p2)
+ return true;
+
+ /* ... or they intersect. */
+ return p1 & p2;
+}
+
#endif /* _ASM_X86_CPU_H */
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 7579e773e29b..cf85431fb09a 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -217,6 +217,38 @@ static bool bad_spectre_microcode(struct cpuinfo_x86 *c)
return false;
}
+int intel_cpu_collect_info(struct ucode_cpu_info *uci)
+{
+ unsigned int val[2];
+ unsigned int family, model;
+ struct cpu_signature csig = { 0 };
+ unsigned int eax, ebx, ecx, edx;
+
+ memset(uci, 0, sizeof(*uci));
+
+ eax = 0x00000001;
+ ecx = 0;
+ native_cpuid(&eax, &ebx, &ecx, &edx);
+ csig.sig = eax;
+
+ family = x86_family(eax);
+ model = x86_model(eax);
+
+ if (model >= 5 || family > 6) {
+ /* get processor flags from MSR 0x17 */
+ native_rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
+ csig.pf = 1 << ((val[1] >> 18) & 7);
+ }
+
+ csig.rev = intel_get_microcode_revision();
+
+ uci->cpu_sig = csig;
+ uci->valid = 1;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(intel_cpu_collect_info);
+
static void early_init_intel(struct cpuinfo_x86 *c)
{
u64 misc_enable;
diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 6a99535d7f37..5f8223909db4 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -45,20 +45,6 @@ static struct microcode_intel *intel_ucode_patch;
/* last level cache size per core */
static int llc_size_per_core;
-static inline bool cpu_signatures_match(unsigned int s1, unsigned int p1,
- unsigned int s2, unsigned int p2)
-{
- if (s1 != s2)
- return false;
-
- /* Processor flags are either both 0 ... */
- if (!p1 && !p2)
- return true;
-
- /* ... or they intersect. */
- return p1 & p2;
-}
-
/*
* Returns 1 if update has been found, 0 otherwise.
*/
@@ -69,7 +55,7 @@ static int find_matching_signature(void *mc, unsigned int csig, int cpf)
struct extended_signature *ext_sig;
int i;
- if (cpu_signatures_match(csig, cpf, mc_hdr->sig, mc_hdr->pf))
+ if (intel_cpu_signatures_match(csig, cpf, mc_hdr->sig, mc_hdr->pf))
return 1;
/* Look for ext. headers: */
@@ -80,7 +66,7 @@ static int find_matching_signature(void *mc, unsigned int csig, int cpf)
ext_sig = (void *)ext_hdr + EXT_HEADER_SIZE;
for (i = 0; i < ext_hdr->count; i++) {
- if (cpu_signatures_match(csig, cpf, ext_sig->sig, ext_sig->pf))
+ if (intel_cpu_signatures_match(csig, cpf, ext_sig->sig, ext_sig->pf))
return 1;
ext_sig++;
}
@@ -385,37 +371,6 @@ next:
return patch;
}
-static int collect_cpu_info_early(struct ucode_cpu_info *uci)
-{
- unsigned int val[2];
- unsigned int family, model;
- struct cpu_signature csig = { 0 };
- unsigned int eax, ebx, ecx, edx;
-
- memset(uci, 0, sizeof(*uci));
-
- eax = 0x00000001;
- ecx = 0;
- native_cpuid(&eax, &ebx, &ecx, &edx);
- csig.sig = eax;
-
- family = x86_family(eax);
- model = x86_model(eax);
-
- if ((model >= 5) || (family > 6)) {
- /* get processor flags from MSR 0x17 */
- native_rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
- csig.pf = 1 << ((val[1] >> 18) & 7);
- }
-
- csig.rev = intel_get_microcode_revision();
-
- uci->cpu_sig = csig;
- uci->valid = 1;
-
- return 0;
-}
-
static void show_saved_mc(void)
{
#ifdef DEBUG
@@ -429,7 +384,7 @@ static void show_saved_mc(void)
return;
}
- collect_cpu_info_early(&uci);
+ intel_cpu_collect_info(&uci);
sig = uci.cpu_sig.sig;
pf = uci.cpu_sig.pf;
@@ -538,7 +493,7 @@ void show_ucode_info_early(void)
struct ucode_cpu_info uci;
if (delay_ucode_info) {
- collect_cpu_info_early(&uci);
+ intel_cpu_collect_info(&uci);
print_ucode_info(&uci, current_mc_date);
delay_ucode_info = 0;
}
@@ -640,7 +595,7 @@ int __init save_microcode_in_initrd_intel(void)
if (!(cp.data && cp.size))
return 0;
- collect_cpu_info_early(&uci);
+ intel_cpu_collect_info(&uci);
scan_microcode(cp.data, cp.size, &uci, true);
@@ -673,7 +628,7 @@ static struct microcode_intel *__load_ucode_intel(struct ucode_cpu_info *uci)
if (!(cp.data && cp.size))
return NULL;
- collect_cpu_info_early(uci);
+ intel_cpu_collect_info(uci);
return scan_microcode(cp.data, cp.size, uci, false);
}
@@ -748,7 +703,7 @@ void reload_ucode_intel(void)
struct microcode_intel *p;
struct ucode_cpu_info uci;
- collect_cpu_info_early(&uci);
+ intel_cpu_collect_info(&uci);
p = find_patch(&uci);
if (!p)
--
2.39.3

129
SOURCES/1016-x86-cpu-Load-microcode-during-restore_processor_stat.patch Normal file
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@ -0,0 +1,129 @@
From be1cba911af4925ef0f42bdfee9682b01c94dfcb Mon Sep 17 00:00:00 2001
From: Borislav Petkov <bp@suse.de>
Date: Tue, 19 Apr 2022 09:52:41 -0700
Subject: [PATCH 02/36] x86/cpu: Load microcode during
restore_processor_state()
When resuming from system sleep state, restore_processor_state()
restores the boot CPU MSRs. These MSRs could be emulated by microcode.
If microcode is not loaded yet, writing to emulated MSRs leads to
unchecked MSR access error:
...
PM: Calling lapic_suspend+0x0/0x210
unchecked MSR access error: WRMSR to 0x10f (tried to write 0x0...0) at rIP: ... (native_write_msr)
Call Trace:
<TASK>
? restore_processor_state
x86_acpi_suspend_lowlevel
acpi_suspend_enter
suspend_devices_and_enter
pm_suspend.cold
state_store
kobj_attr_store
sysfs_kf_write
kernfs_fop_write_iter
new_sync_write
vfs_write
ksys_write
__x64_sys_write
do_syscall_64
entry_SYSCALL_64_after_hwframe
RIP: 0033:0x7fda13c260a7
To ensure microcode emulated MSRs are available for restoration, load
the microcode on the boot CPU before restoring these MSRs.
[ Pawan: write commit message and productize it. ]
Fixes: e2a1256b17b1 ("x86/speculation: Restore speculation related MSRs during S3 resume")
Reported-by: Kyle D. Pelton <kyle.d.pelton@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Tested-by: Kyle D. Pelton <kyle.d.pelton@intel.com>
Cc: stable@vger.kernel.org
Link: https://bugzilla.kernel.org/show_bug.cgi?id=215841
Link: https://lore.kernel.org/r/4350dfbf785cd482d3fafa72b2b49c83102df3ce.1650386317.git.pawan.kumar.gupta@linux.intel.com
(cherry picked from commit f9e14dbbd454581061c736bf70bf5cbb15ac927c)
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/include/asm/microcode.h | 2 ++
arch/x86/kernel/cpu/microcode/core.c | 6 +++---
arch/x86/power/cpu.c | 8 ++++++++
3 files changed, 13 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/microcode.h b/arch/x86/include/asm/microcode.h
index 2b7cc5397f80..a930a63d1260 100644
--- a/arch/x86/include/asm/microcode.h
+++ b/arch/x86/include/asm/microcode.h
@@ -133,6 +133,7 @@ extern void load_ucode_ap(void);
void reload_early_microcode(void);
extern bool get_builtin_firmware(struct cpio_data *cd, const char *name);
extern bool initrd_gone;
+void microcode_bsp_resume(void);
#else
static inline int __init microcode_init(void) { return 0; };
static inline void __init load_ucode_bsp(void) { }
@@ -140,6 +141,7 @@ static inline void load_ucode_ap(void) { }
static inline void reload_early_microcode(void) { }
static inline bool
get_builtin_firmware(struct cpio_data *cd, const char *name) { return false; }
+static inline void microcode_bsp_resume(void) { }
#endif
#endif /* _ASM_X86_MICROCODE_H */
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index e263da7247af..f0946658f885 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -778,9 +778,9 @@ static struct subsys_interface mc_cpu_interface = {
};
/**
- * mc_bp_resume - Update boot CPU microcode during resume.
+ * microcode_bsp_resume - Update boot CPU microcode during resume.
*/
-static void mc_bp_resume(void)
+void microcode_bsp_resume(void)
{
int cpu = smp_processor_id();
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
@@ -792,7 +792,7 @@ static void mc_bp_resume(void)
}
static struct syscore_ops mc_syscore_ops = {
- .resume = mc_bp_resume,
+ .resume = microcode_bsp_resume,
};
static int mc_cpu_starting(unsigned int cpu)
diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c
index f48756c903d4..dd5a29553697 100644
--- a/arch/x86/power/cpu.c
+++ b/arch/x86/power/cpu.c
@@ -25,6 +25,7 @@
#include <asm/cpu.h>
#include <asm/mmu_context.h>
#include <linux/dmi.h>
+#include <asm/microcode.h>
#ifdef CONFIG_X86_32
__visible unsigned long saved_context_ebx;
@@ -266,6 +267,13 @@ static void notrace __restore_processor_state(struct saved_context *ctxt)
x86_platform.restore_sched_clock_state();
mtrr_bp_restore();
perf_restore_debug_store();
+
+ microcode_bsp_resume();
+
+ /*
+ * This needs to happen after the microcode has been updated upon resume
+ * because some of the MSRs are "emulated" in microcode.
+ */
msr_restore_context(ctxt);
}
--
2.39.3

51
SOURCES/1017-x86-microcode-Deprecate-MICROCODE_OLD_INTERFACE.patch Normal file
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@ -0,0 +1,51 @@
From b31d4c149df44c050b12b7aca2c535e06f1b1237 Mon Sep 17 00:00:00 2001
From: Borislav Petkov <bp@suse.de>
Date: Fri, 5 Apr 2019 06:28:11 +0200
Subject: [PATCH 03/36] x86/microcode: Deprecate MICROCODE_OLD_INTERFACE
This is the ancient loading interface which requires special tools to be
used. The bigger problem with it is that it is as inadequate for proper
loading of microcode as the late microcode loading interface is because
it happens just as late.
iucode_tool's manpage already warns people that it is deprecated.
Deprecate it and turn it off by default along with a big fat warning in
the Kconfig help. It will go away sometime in the future.
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: x86@kernel.org
Link: https://lkml.kernel.org/r/20190405133010.24249-4-bp@alien8.de
(cherry picked from commit c02f48e070bde326f55bd94544ca82291f7396e3)
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/Kconfig | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index f26d1d596e9a..4f762b807bd4 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1361,8 +1361,16 @@ config MICROCODE_AMD
processors will be enabled.
config MICROCODE_OLD_INTERFACE
- def_bool y
+ bool "Ancient loading interface (DEPRECATED)"
+ default n
depends on MICROCODE
+ ---help---
+ DO NOT USE THIS! This is the ancient /dev/cpu/microcode interface
+ which was used by userspace tools like iucode_tool and microcode.ctl.
+ It is inadequate because it runs too late to be able to properly
+ load microcode on a machine and it needs special tools. Instead, you
+ should've switched to the early loading method with the initrd or
+ builtin microcode by now: Documentation/x86/microcode.txt
config X86_MSR
tristate "/dev/cpu/*/msr - Model-specific register support"
--
2.39.3

170
SOURCES/1018-x86-microcode-Rip-out-the-OLD_INTERFACE.patch Normal file
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@ -0,0 +1,170 @@
From c11a8e91d637901133fad441470d2240cc9d05e7 Mon Sep 17 00:00:00 2001
From: Borislav Petkov <bp@suse.de>
Date: Wed, 25 May 2022 18:12:29 +0200
Subject: [PATCH 04/36] x86/microcode: Rip out the OLD_INTERFACE
Everything should be using the early initrd loading by now.
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20220525161232.14924-2-bp@alien8.de
(cherry picked from commit 181b6f40e9ea80c76756d4d0cdeed396016c487e)
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/Kconfig | 12 ----
arch/x86/kernel/cpu/microcode/core.c | 100 ---------------------------
2 files changed, 112 deletions(-)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 4f762b807bd4..b9bcde5c538f 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1360,18 +1360,6 @@ config MICROCODE_AMD
If you select this option, microcode patch loading support for AMD
processors will be enabled.
-config MICROCODE_OLD_INTERFACE
- bool "Ancient loading interface (DEPRECATED)"
- default n
- depends on MICROCODE
- ---help---
- DO NOT USE THIS! This is the ancient /dev/cpu/microcode interface
- which was used by userspace tools like iucode_tool and microcode.ctl.
- It is inadequate because it runs too late to be able to properly
- load microcode on a machine and it needs special tools. Instead, you
- should've switched to the early loading method with the initrd or
- builtin microcode by now: Documentation/x86/microcode.txt
-
config X86_MSR
tristate "/dev/cpu/*/msr - Model-specific register support"
---help---
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index f0946658f885..bbc262a5fc0d 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -392,98 +392,6 @@ static int apply_microcode_on_target(int cpu)
return ret;
}
-#ifdef CONFIG_MICROCODE_OLD_INTERFACE
-static int do_microcode_update(const void __user *buf, size_t size)
-{
- int error = 0;
- int cpu;
-
- for_each_online_cpu(cpu) {
- struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
- enum ucode_state ustate;
-
- if (!uci->valid)
- continue;
-
- ustate = microcode_ops->request_microcode_user(cpu, buf, size);
- if (ustate == UCODE_ERROR) {
- error = -1;
- break;
- } else if (ustate == UCODE_NEW) {
- apply_microcode_on_target(cpu);
- }
- }
-
- return error;
-}
-
-static int microcode_open(struct inode *inode, struct file *file)
-{
- return capable(CAP_SYS_RAWIO) ? nonseekable_open(inode, file) : -EPERM;
-}
-
-static ssize_t microcode_write(struct file *file, const char __user *buf,
- size_t len, loff_t *ppos)
-{
- ssize_t ret = -EINVAL;
- unsigned long nr_pages = totalram_pages();
-
- if ((len >> PAGE_SHIFT) > nr_pages) {
- pr_err("too much data (max %ld pages)\n", nr_pages);
- return ret;
- }
-
- get_online_cpus();
- mutex_lock(&microcode_mutex);
-
- if (do_microcode_update(buf, len) == 0)
- ret = (ssize_t)len;
-
- if (ret > 0)
- perf_check_microcode();
-
- mutex_unlock(&microcode_mutex);
- put_online_cpus();
-
- return ret;
-}
-
-static const struct file_operations microcode_fops = {
- .owner = THIS_MODULE,
- .write = microcode_write,
- .open = microcode_open,
- .llseek = no_llseek,
-};
-
-static struct miscdevice microcode_dev = {
- .minor = MICROCODE_MINOR,
- .name = "microcode",
- .nodename = "cpu/microcode",
- .fops = &microcode_fops,
-};
-
-static int __init microcode_dev_init(void)
-{
- int error;
-
- error = misc_register(&microcode_dev);
- if (error) {
- pr_err("can't misc_register on minor=%d\n", MICROCODE_MINOR);
- return error;
- }
-
- return 0;
-}
-
-static void __exit microcode_dev_exit(void)
-{
- misc_deregister(&microcode_dev);
-}
-#else
-#define microcode_dev_init() 0
-#define microcode_dev_exit() do { } while (0)
-#endif
-
/* fake device for request_firmware */
static struct platform_device *microcode_pdev;
@@ -876,10 +784,6 @@ int __init microcode_init(void)
goto out_driver;
}
- error = microcode_dev_init();
- if (error)
- goto out_ucode_group;
-
register_syscore_ops(&mc_syscore_ops);
cpuhp_setup_state_nocalls(CPUHP_AP_MICROCODE_LOADER, "x86/microcode:starting",
mc_cpu_starting, NULL);
@@ -890,10 +794,6 @@ int __init microcode_init(void)
return 0;
- out_ucode_group:
- sysfs_remove_group(&cpu_subsys.dev_root->kobj,
- &cpu_root_microcode_group);
-
out_driver:
get_online_cpus();
mutex_lock(&microcode_mutex);
--
2.39.3

106
SOURCES/1019-x86-microcode-Default-disable-late-loading.patch Normal file
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@ -0,0 +1,106 @@
From 9cc01dc772e684b7864d8c8a1f526035c991aa76 Mon Sep 17 00:00:00 2001
From: Borislav Petkov <bp@suse.de>
Date: Wed, 25 May 2022 18:12:30 +0200
Subject: [PATCH 05/36] x86/microcode: Default-disable late loading
It is dangerous and it should not be used anyway - there's a nice early
loading already.
Requested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20220525161232.14924-3-bp@alien8.de
(cherry picked from commit a77a94f86273ce42a39cb479217dd8d68acfe0ff)
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/Kconfig | 11 +++++++++++
arch/x86/kernel/cpu/common.c | 2 ++
arch/x86/kernel/cpu/microcode/core.c | 7 ++++++-
3 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index b9bcde5c538f..5af5427c50ae 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1360,6 +1360,17 @@ config MICROCODE_AMD
If you select this option, microcode patch loading support for AMD
processors will be enabled.
+config MICROCODE_LATE_LOADING
+ bool "Late microcode loading (DANGEROUS)"
+ default n
+ depends on MICROCODE
+ help
+ Loading microcode late, when the system is up and executing instructions
+ is a tricky business and should be avoided if possible. Just the sequence
+ of synchronizing all cores and SMT threads is one fragile dance which does
+ not guarantee that cores might not softlock after the loading. Therefore,
+ use this at your own risk. Late loading taints the kernel too.
+
config X86_MSR
tristate "/dev/cpu/*/msr - Model-specific register support"
---help---
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index f59edeef14eb..7be057c7531c 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -2145,6 +2145,7 @@ void cpu_init_secondary(void)
}
#endif
+#ifdef CONFIG_MICROCODE_LATE_LOADING
/*
* The microcode loader calls this upon late microcode load to recheck features,
* only when microcode has been updated. Caller holds microcode_mutex and CPU
@@ -2174,6 +2175,7 @@ void microcode_check(void)
pr_warn("x86/CPU: CPU features have changed after loading microcode, but might not take effect.\n");
pr_warn("x86/CPU: Please consider either early loading through initrd/built-in or a potential BIOS update.\n");
}
+#endif
/*
* Invoked from core CPU hotplug code after hotplug operations
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index bbc262a5fc0d..c4d19f4b7afb 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -395,6 +395,7 @@ static int apply_microcode_on_target(int cpu)
/* fake device for request_firmware */
static struct platform_device *microcode_pdev;
+#ifdef CONFIG_MICROCODE_LATE_LOADING
/*
* Late loading dance. Why the heavy-handed stomp_machine effort?
*
@@ -563,6 +564,9 @@ put:
return ret;
}
+static DEVICE_ATTR_WO(reload);
+#endif
+
static ssize_t version_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -579,7 +583,6 @@ static ssize_t pf_show(struct device *dev,
return sprintf(buf, "0x%x\n", uci->cpu_sig.pf);
}
-static DEVICE_ATTR_WO(reload);
static DEVICE_ATTR(version, 0444, version_show, NULL);
static DEVICE_ATTR(processor_flags, 0444, pf_show, NULL);
@@ -732,7 +735,9 @@ static int mc_cpu_down_prep(unsigned int cpu)
}
static struct attribute *cpu_root_microcode_attrs[] = {
+#ifdef CONFIG_MICROCODE_LATE_LOADING
&dev_attr_reload.attr,
+#endif
NULL
};
--
2.39.3

47
SOURCES/1020-x86-microcode-Taint-and-warn-on-late-loading.patch Normal file
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@ -0,0 +1,47 @@
From abfdcc849a720f36bbb075ee35d64e84314387fe Mon Sep 17 00:00:00 2001
From: Borislav Petkov <bp@suse.de>
Date: Wed, 25 May 2022 18:12:31 +0200
Subject: [PATCH 06/36] x86/microcode: Taint and warn on late loading
Warn before it is attempted and taint the kernel. Late loading microcode
can lead to malfunction of the kernel when the microcode update changes
behaviour. There is no way for the kernel to determine whether its safe or
not.
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20220525161232.14924-4-bp@alien8.de
(cherry picked from commit d23d33ea0fcdc4bbb484990bf53867f99c63ccab)
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/kernel/cpu/microcode/core.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index c4d19f4b7afb..a803b839b16e 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -513,6 +513,9 @@ static int microcode_reload_late(void)
{
int ret;
+ pr_err("Attempting late microcode loading - it is dangerous and taints the kernel.\n");
+ pr_err("You should switch to early loading, if possible.\n");
+
atomic_set(&late_cpus_in, 0);
atomic_set(&late_cpus_out, 0);
@@ -561,6 +564,8 @@ put:
if (ret >= 0)
ret = size;
+ add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_STILL_OK);
+
return ret;
}
--
2.39.3

45
SOURCES/1021-x86-microcode-Remove-unnecessary-perf-callback.patch Normal file
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@ -0,0 +1,45 @@
From 88686baf053310a4bd81088bd733c8be8a68db49 Mon Sep 17 00:00:00 2001
From: Borislav Petkov <bp@suse.de>
Date: Wed, 25 May 2022 18:12:32 +0200
Subject: [PATCH 07/36] x86/microcode: Remove unnecessary perf callback
c93dc84cbe32 ("perf/x86: Add a microcode revision check for SNB-PEBS")
checks whether the microcode revision has fixed PEBS issues.
This can happen either:
1. At PEBS init time, where the early microcode has been loaded already
2. During late loading, in the microcode_check() callback.
So remove the unnecessary call in the microcode loader init routine.
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20220525161232.14924-5-bp@alien8.de
(cherry picked from commit 0c0fe08c76485fe0178ebb0fa1a2052c727abe94)
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/kernel/cpu/microcode/core.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index a803b839b16e..44bac17304ac 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -776,10 +776,7 @@ int __init microcode_init(void)
get_online_cpus();
mutex_lock(&microcode_mutex);
-
error = subsys_interface_register(&mc_cpu_interface);
- if (!error)
- perf_check_microcode();
mutex_unlock(&microcode_mutex);
put_online_cpus();
--
2.39.3

49
SOURCES/1022-x86-microcode-Print-previous-version-of-microcode-af.patch Normal file
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@ -0,0 +1,49 @@
From bdaca71f1e3ffeea24c2a02d4eb21879d4dece96 Mon Sep 17 00:00:00 2001
From: Ashok Raj <ashok.raj@intel.com>
Date: Mon, 29 Aug 2022 18:10:30 +0000
Subject: [PATCH 08/36] x86/microcode: Print previous version of microcode
after reload
Print both old and new versions of microcode after a reload is complete
because knowing the previous microcode version is sometimes important
from a debugging perspective.
[ bp: Massage commit message. ]
Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/r/20220829181030.722891-1-ashok.raj@intel.com
(cherry picked from commit 7fce8d6eccbc31a561d07c79f359ad09f0424347)
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/kernel/cpu/microcode/core.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 44bac17304ac..6affa814699d 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -511,7 +511,7 @@ wait_for_siblings:
*/
static int microcode_reload_late(void)
{
- int ret;
+ int old = boot_cpu_data.microcode, ret;
pr_err("Attempting late microcode loading - it is dangerous and taints the kernel.\n");
pr_err("You should switch to early loading, if possible.\n");
@@ -523,7 +523,8 @@ static int microcode_reload_late(void)
if (ret > 0)
microcode_check();
- pr_info("Reload completed, microcode revision: 0x%x\n", boot_cpu_data.microcode);
+ pr_info("Reload completed, microcode revision: 0x%x -> 0x%x\n",
+ old, boot_cpu_data.microcode);
return ret;
}
--
2.39.3

179
SOURCES/1023-x86-microcode-Rip-out-the-subsys-interface-gunk.patch Normal file
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@ -0,0 +1,179 @@
From 15a76d02ad4df4dbe37ed5bda874deeba2659843 Mon Sep 17 00:00:00 2001
From: Borislav Petkov <bp@suse.de>
Date: Wed, 19 Oct 2022 18:13:06 +0200
Subject: [PATCH 09/36] x86/microcode: Rip out the subsys interface gunk
This is a left-over from the old days when CPU hotplug wasn't as robust
as it is now. Currently, microcode gets loaded early on the CPU init
path and there's no need to attempt to load it again, which that subsys
interface callback is doing.
The only other thing that the subsys interface init path was doing is
adding the
/sys/devices/system/cpu/cpu*/microcode/
hierarchy.
So add a function which gets called on each CPU after all the necessary
driver setup has happened. Use schedule_on_each_cpu() which can block
because the sysfs creating code does kmem_cache_zalloc() which can block
too and the initial version of this where it did that setup in an IPI
handler of on_each_cpu() can cause a deadlock of the sort:
lock(fs_reclaim);
<Interrupt>
lock(fs_reclaim);
as the IPI handler runs in IRQ context.
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Ashok Raj <ashok.raj@intel.com>
Link: https://lore.kernel.org/r/20221028142638.28498-2-bp@alien8.de
(cherry picked from commit b6f86689d5b740f2cc3ac3a1032c7374b24381cc)
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/kernel/cpu/microcode/core.c | 82 +++++++---------------------
1 file changed, 21 insertions(+), 61 deletions(-)
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 6affa814699d..8a7fc5d8db6e 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -621,8 +621,8 @@ static enum ucode_state microcode_resume_cpu(int cpu)
static enum ucode_state microcode_init_cpu(int cpu, bool refresh_fw)
{
- enum ucode_state ustate;
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
+ enum ucode_state ustate;
if (uci->valid)
return UCODE_OK;
@@ -656,44 +656,6 @@ static enum ucode_state microcode_update_cpu(int cpu)
return microcode_init_cpu(cpu, false);
}
-static int mc_device_add(struct device *dev, struct subsys_interface *sif)
-{
- int err, cpu = dev->id;
-
- if (!cpu_online(cpu))
- return 0;
-
- pr_debug("CPU%d added\n", cpu);
-
- err = sysfs_create_group(&dev->kobj, &mc_attr_group);
- if (err)
- return err;
-
- if (microcode_init_cpu(cpu, true) == UCODE_ERROR)
- return -EINVAL;
-
- return err;
-}
-
-static void mc_device_remove(struct device *dev, struct subsys_interface *sif)
-{
- int cpu = dev->id;
-
- if (!cpu_online(cpu))
- return;
-
- pr_debug("CPU%d removed\n", cpu);
- microcode_fini_cpu(cpu);
- sysfs_remove_group(&dev->kobj, &mc_attr_group);
-}
-
-static struct subsys_interface mc_cpu_interface = {
- .name = "microcode",
- .subsys = &cpu_subsys,
- .add_dev = mc_device_add,
- .remove_dev = mc_device_remove,
-};
-
/**
* microcode_bsp_resume - Update boot CPU microcode during resume.
*/
@@ -733,6 +695,9 @@ static int mc_cpu_down_prep(unsigned int cpu)
struct device *dev;
dev = get_cpu_device(cpu);
+
+ microcode_fini_cpu(cpu);
+
/* Suspend is in progress, only remove the interface */
sysfs_remove_group(&dev->kobj, &mc_attr_group);
pr_debug("CPU%d removed\n", cpu);
@@ -740,6 +705,18 @@ static int mc_cpu_down_prep(unsigned int cpu)
return 0;
}
+static void setup_online_cpu(struct work_struct *work)
+{
+ int cpu = smp_processor_id();
+ struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
+
+ memset(uci, 0, sizeof(*uci));
+
+ microcode_ops->collect_cpu_info(cpu, &uci->cpu_sig);
+
+ mc_cpu_online(cpu);
+}
+
static struct attribute *cpu_root_microcode_attrs[] = {
#ifdef CONFIG_MICROCODE_LATE_LOADING
&dev_attr_reload.attr,
@@ -771,27 +748,19 @@ int __init microcode_init(void)
return -ENODEV;
microcode_pdev = platform_device_register_simple("microcode", -1,
- NULL, 0);
- if (IS_ERR(microcode_pdev))
- return PTR_ERR(microcode_pdev);
-
- get_online_cpus();
- mutex_lock(&microcode_mutex);
- error = subsys_interface_register(&mc_cpu_interface);
- mutex_unlock(&microcode_mutex);
- put_online_cpus();
-
- if (error)
- goto out_pdev;
+ NULL, 0);
error = sysfs_create_group(&cpu_subsys.dev_root->kobj,
&cpu_root_microcode_group);
if (error) {
pr_err("Error creating microcode group!\n");
- goto out_driver;
+ goto out_pdev;
}
+ /* Do per-CPU setup */
+ schedule_on_each_cpu(setup_online_cpu);
+
register_syscore_ops(&mc_syscore_ops);
cpuhp_setup_state_nocalls(CPUHP_AP_MICROCODE_LOADER, "x86/microcode:starting",
mc_cpu_starting, NULL);
@@ -802,15 +771,6 @@ int __init microcode_init(void)
return 0;
- out_driver:
- get_online_cpus();
- mutex_lock(&microcode_mutex);
-
- subsys_interface_unregister(&mc_cpu_interface);
-
- mutex_unlock(&microcode_mutex);
- put_online_cpus();
-
out_pdev:
platform_device_unregister(microcode_pdev);
return error;
--
2.39.3

212
SOURCES/1024-x86-microcode-Simplify-init-path-even-more.patch Normal file
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@ -0,0 +1,212 @@
From 1a37aa866d76aaab6901bb331ea1be202ccad636 Mon Sep 17 00:00:00 2001
From: Borislav Petkov <bp@suse.de>
Date: Wed, 19 Oct 2022 19:07:30 +0200
Subject: [PATCH 10/36] x86/microcode: Simplify init path even more
Get rid of all the IPI-sending functions and their wrappers and use
those which are supposed to be called on each CPU.
Thus:
- microcode_init_cpu() gets called on each CPU on init, applying any new
microcode that the driver might've found on the filesystem.
- mc_cpu_starting() simply tries to apply cached microcode as this is
the cpuhp starting callback which gets called on CPU resume too.
Even if the driver init function is a late initcall, there is no
filesystem by then (not even a hdd driver has been loaded yet) so a new
firmware load attempt cannot simply be done.
It is pointless anyway - for that there's late loading if one really
needs it.
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Ashok Raj <ashok.raj@intel.com>
Link: https://lore.kernel.org/r/20221028142638.28498-3-bp@alien8.de
(cherry picked from commit 2071c0aeda228107bf1b9e870b6187c90fbeef1d)
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/kernel/cpu/microcode/core.c | 120 ++++-----------------------
1 file changed, 16 insertions(+), 104 deletions(-)
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 8a7fc5d8db6e..50321a43da01 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -338,60 +338,6 @@ void reload_early_microcode(void)
}
}
-static void collect_cpu_info_local(void *arg)
-{
- struct cpu_info_ctx *ctx = arg;
-
- ctx->err = microcode_ops->collect_cpu_info(smp_processor_id(),
- ctx->cpu_sig);
-}
-
-static int collect_cpu_info_on_target(int cpu, struct cpu_signature *cpu_sig)
-{
- struct cpu_info_ctx ctx = { .cpu_sig = cpu_sig, .err = 0 };
- int ret;
-
- ret = smp_call_function_single(cpu, collect_cpu_info_local, &ctx, 1);
- if (!ret)
- ret = ctx.err;
-
- return ret;
-}
-
-static int collect_cpu_info(int cpu)
-{
- struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
- int ret;
-
- memset(uci, 0, sizeof(*uci));
-
- ret = collect_cpu_info_on_target(cpu, &uci->cpu_sig);
- if (!ret)
- uci->valid = 1;
-
- return ret;
-}
-
-static void apply_microcode_local(void *arg)
-{
- enum ucode_state *err = arg;
-
- *err = microcode_ops->apply_microcode(smp_processor_id());
-}
-
-static int apply_microcode_on_target(int cpu)
-{
- enum ucode_state err;
- int ret;
-
- ret = smp_call_function_single(cpu, apply_microcode_local, &err, 1);
- if (!ret) {
- if (err == UCODE_ERROR)
- ret = 1;
- }
- return ret;
-}
-
/* fake device for request_firmware */
static struct platform_device *microcode_pdev;
@@ -478,7 +424,7 @@ static int __reload_late(void *info)
* below.
*/
if (cpumask_first(topology_sibling_cpumask(cpu)) == cpu)
- apply_microcode_local(&err);
+ err = microcode_ops->apply_microcode(cpu);
else
goto wait_for_siblings;
@@ -500,7 +446,7 @@ wait_for_siblings:
* revision.
*/
if (cpumask_first(topology_sibling_cpumask(cpu)) != cpu)
- apply_microcode_local(&err);
+ err = microcode_ops->apply_microcode(cpu);
return ret;
}
@@ -609,51 +555,15 @@ static void microcode_fini_cpu(int cpu)
microcode_ops->microcode_fini_cpu(cpu);
}
-static enum ucode_state microcode_resume_cpu(int cpu)
-{
- if (apply_microcode_on_target(cpu))
- return UCODE_ERROR;
-
- pr_debug("CPU%d updated upon resume\n", cpu);
-
- return UCODE_OK;
-}
-
-static enum ucode_state microcode_init_cpu(int cpu, bool refresh_fw)
-{
- struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
- enum ucode_state ustate;
-
- if (uci->valid)
- return UCODE_OK;
-
- if (collect_cpu_info(cpu))
- return UCODE_ERROR;
-
- /* --dimm. Trigger a delayed update? */
- if (system_state != SYSTEM_RUNNING)
- return UCODE_NFOUND;
-
- ustate = microcode_ops->request_microcode_fw(cpu, &microcode_pdev->dev, refresh_fw);
- if (ustate == UCODE_NEW) {
- pr_debug("CPU%d updated upon init\n", cpu);
- apply_microcode_on_target(cpu);
- }
-
- return ustate;
-}
-
-static enum ucode_state microcode_update_cpu(int cpu)
+static enum ucode_state microcode_init_cpu(int cpu)
{
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
- /* Refresh CPU microcode revision after resume. */
- collect_cpu_info(cpu);
+ memset(uci, 0, sizeof(*uci));
- if (uci->valid)
- return microcode_resume_cpu(cpu);
+ microcode_ops->collect_cpu_info(cpu, &uci->cpu_sig);
- return microcode_init_cpu(cpu, false);
+ return microcode_ops->apply_microcode(cpu);
}
/**
@@ -671,14 +581,14 @@ void microcode_bsp_resume(void)
}
static struct syscore_ops mc_syscore_ops = {
- .resume = microcode_bsp_resume,
+ .resume = microcode_bsp_resume,
};
static int mc_cpu_starting(unsigned int cpu)
{
- microcode_update_cpu(cpu);
- pr_debug("CPU%d added\n", cpu);
- return 0;
+ enum ucode_state err = microcode_ops->apply_microcode(cpu);
+
+ return err == UCODE_ERROR;
}
static int mc_cpu_online(unsigned int cpu)
@@ -708,11 +618,13 @@ static int mc_cpu_down_prep(unsigned int cpu)
static void setup_online_cpu(struct work_struct *work)
{
int cpu = smp_processor_id();
- struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
-
- memset(uci, 0, sizeof(*uci));
+ enum ucode_state err;
- microcode_ops->collect_cpu_info(cpu, &uci->cpu_sig);
+ err = microcode_init_cpu(cpu);
+ if (err == UCODE_ERROR) {
+ pr_err("Error applying microcode on CPU%d\n", cpu);
+ return;
+ }
mc_cpu_online(cpu);
}
--
2.39.3

88
SOURCES/1025-x86-microcode-AMD-Rename-a-couple-of-functions.patch Normal file
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@ -0,0 +1,88 @@
From a385d6a4761819826f5fb234415f4f1ad43fc141 Mon Sep 17 00:00:00 2001
From: Borislav Petkov <bp@suse.de>
Date: Mon, 19 Dec 2022 22:06:55 +0100
Subject: [PATCH 11/36] x86/microcode/AMD: Rename a couple of functions
- Rename apply_microcode_early_amd() to early_apply_microcode():
simplify the name so that it is clear what it does and when does it do
it.
- Rename __load_ucode_amd() to find_blobs_in_containers(): the new name
actually explains what it does.
Document some.
No functional changes.
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20221219210656.5140-1-bp@alien8.de
(cherry picked from commit 61de9b7036f26448a1916291c456f62dd6bf07ea)
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/kernel/cpu/microcode/amd.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 750889d77b56..0b557d04be22 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -415,8 +415,7 @@ static int __apply_microcode_amd(struct microcode_amd *mc)
*
* Returns true if container found (sets @desc), false otherwise.
*/
-static bool
-apply_microcode_early_amd(u32 cpuid_1_eax, void *ucode, size_t size, bool save_patch)
+static bool early_apply_microcode(u32 cpuid_1_eax, void *ucode, size_t size, bool save_patch)
{
struct cont_desc desc = { 0 };
u8 (*patch)[PATCH_MAX_SIZE];
@@ -476,7 +475,7 @@ static bool get_builtin_microcode(struct cpio_data *cp, unsigned int family)
#endif
}
-static void __load_ucode_amd(unsigned int cpuid_1_eax, struct cpio_data *ret)
+static void find_blobs_in_containers(unsigned int cpuid_1_eax, struct cpio_data *ret)
{
struct ucode_cpu_info *uci;
struct cpio_data cp;
@@ -506,11 +505,11 @@ void __init load_ucode_amd_bsp(unsigned int cpuid_1_eax)
{
struct cpio_data cp = { };
- __load_ucode_amd(cpuid_1_eax, &cp);
+ find_blobs_in_containers(cpuid_1_eax, &cp);
if (!(cp.data && cp.size))
return;
- apply_microcode_early_amd(cpuid_1_eax, cp.data, cp.size, true);
+ early_apply_microcode(cpuid_1_eax, cp.data, cp.size, true);
}
void load_ucode_amd_ap(unsigned int cpuid_1_eax)
@@ -541,11 +540,11 @@ void load_ucode_amd_ap(unsigned int cpuid_1_eax)
}
}
- __load_ucode_amd(cpuid_1_eax, &cp);
+ find_blobs_in_containers(cpuid_1_eax, &cp);
if (!(cp.data && cp.size))
return;
- apply_microcode_early_amd(cpuid_1_eax, cp.data, cp.size, false);
+ early_apply_microcode(cpuid_1_eax, cp.data, cp.size, false);
}
static enum ucode_state
@@ -810,6 +809,7 @@ static int verify_and_add_patch(u8 family, u8 *fw, unsigned int leftover,
return 0;
}
+/* Scan the blob in @data and add microcode patches to the cache. */
static enum ucode_state __load_microcode_amd(u8 family, const u8 *data,
size_t size)
{
--
2.39.3

79
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@ -0,0 +1,79 @@
From f19ca27f91db6320d02ba1cd28751a217616e282 Mon Sep 17 00:00:00 2001
From: Mihai Carabas <mihai.carabas@oracle.com>
Date: Tue, 21 Apr 2020 22:28:38 +0300
Subject: [PATCH 12/36] x86/microcode: Fix return value for microcode late
loading
The return value from stop_machine() might not be consistent.
stop_machine_cpuslocked() returns:
- zero if all functions have returned 0.
- a non-zero value if at least one of the functions returned
a non-zero value.
There is no way to know if it is negative or positive. So make
__reload_late() return 0 on success or negative otherwise.
[ bp: Unify ret val check and touch up. ]
Signed-off-by: Mihai Carabas <mihai.carabas@oracle.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/1587497318-4438-1-git-send-email-mihai.carabas@oracle.com
(cherry picked from commit 9adbf3c609af92a57a73000a3cb8f4c2d307dfa3)
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/kernel/cpu/microcode/core.c | 15 +++++++--------
1 file changed, 7 insertions(+), 8 deletions(-)
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 50321a43da01..36f78ceca5f2 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -400,8 +400,7 @@ static int __wait_for_cpus(atomic_t *t, long long timeout)
/*
* Returns:
* < 0 - on error
- * 0 - no update done
- * 1 - microcode was updated
+ * 0 - success (no update done or microcode was updated)
*/
static int __reload_late(void *info)
{
@@ -428,11 +427,11 @@ static int __reload_late(void *info)
else
goto wait_for_siblings;
- if (err > UCODE_NFOUND) {
- pr_warn("Error reloading microcode on CPU %d\n", cpu);
+ if (err >= UCODE_NFOUND) {
+ if (err == UCODE_ERROR)
+ pr_warn("Error reloading microcode on CPU %d\n", cpu);
+
ret = -1;
- } else if (err == UCODE_UPDATED || err == UCODE_OK) {
- ret = 1;
}
wait_for_siblings:
@@ -466,7 +465,7 @@ static int microcode_reload_late(void)
atomic_set(&late_cpus_out, 0);
ret = stop_machine_cpuslocked(__reload_late, NULL, cpu_online_mask);
- if (ret > 0)
+ if (ret == 0)
microcode_check();
pr_info("Reload completed, microcode revision: 0x%x -> 0x%x\n",
@@ -508,7 +507,7 @@ static ssize_t reload_store(struct device *dev,
put:
put_online_cpus();
- if (ret >= 0)
+ if (ret == 0)
ret = size;
add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_STILL_OK);
--
2.39.3

110
SOURCES/1027-x86-microcode-Add-a-parameter-to-microcode_check-to-.patch Normal file
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@ -0,0 +1,110 @@
From e298b1596a0ace2d3b272747a645856f6eb61128 Mon Sep 17 00:00:00 2001
From: Ashok Raj <ashok.raj@intel.com>
Date: Mon, 9 Jan 2023 07:35:50 -0800
Subject: [PATCH 13/36] x86/microcode: Add a parameter to microcode_check() to
store CPU capabilities
Add a parameter to store CPU capabilities before performing a microcode
update so that CPU capabilities can be compared before and after update.
[ bp: Massage. ]
Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230109153555.4986-2-ashok.raj@intel.com
(cherry picked from commit ab31c74455c64e69342ddab21fd9426fcbfefde7)
CVE: CVE-2023-20593
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/include/asm/processor.h | 2 +-
arch/x86/kernel/cpu/common.c | 21 +++++++++++++--------
arch/x86/kernel/cpu/microcode/core.c | 3 ++-
3 files changed, 16 insertions(+), 10 deletions(-)
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 605740dfd017..9968d456d7e8 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -919,7 +919,7 @@ bool xen_set_default_idle(void);
void stop_this_cpu(void *dummy);
void df_debug(struct pt_regs *regs, long error_code);
-void microcode_check(void);
+void microcode_check(struct cpuinfo_x86 *prev_info);
enum l1tf_mitigations {
L1TF_MITIGATION_OFF,
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 7be057c7531c..437fe55acce8 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -2146,30 +2146,35 @@ void cpu_init_secondary(void)
#endif
#ifdef CONFIG_MICROCODE_LATE_LOADING
-/*
+/**
+ * microcode_check() - Check if any CPU capabilities changed after an update.
+ * @prev_info: CPU capabilities stored before an update.
+ *
* The microcode loader calls this upon late microcode load to recheck features,
* only when microcode has been updated. Caller holds microcode_mutex and CPU
* hotplug lock.
+ *
+ * Return: None
*/
-void microcode_check(void)
+void microcode_check(struct cpuinfo_x86 *prev_info)
{
- struct cpuinfo_x86 info;
-
perf_check_microcode();
/* Reload CPUID max function as it might've changed. */
- info.cpuid_level = cpuid_eax(0);
+ prev_info->cpuid_level = cpuid_eax(0);
/*
* Copy all capability leafs to pick up the synthetic ones so that
* memcmp() below doesn't fail on that. The ones coming from CPUID will
* get overwritten in get_cpu_cap().
*/
- memcpy(&info.x86_capability, &boot_cpu_data.x86_capability, sizeof(info.x86_capability));
+ memcpy(&prev_info->x86_capability, &boot_cpu_data.x86_capability,
+ sizeof(prev_info->x86_capability));
- get_cpu_cap(&info);
+ get_cpu_cap(prev_info);
- if (!memcmp(&info.x86_capability, &boot_cpu_data.x86_capability, sizeof(info.x86_capability)))
+ if (!memcmp(&prev_info->x86_capability, &boot_cpu_data.x86_capability,
+ sizeof(prev_info->x86_capability)))
return;
pr_warn("x86/CPU: CPU features have changed after loading microcode, but might not take effect.\n");
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 36f78ceca5f2..41a90074df21 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -457,6 +457,7 @@ wait_for_siblings:
static int microcode_reload_late(void)
{
int old = boot_cpu_data.microcode, ret;
+ struct cpuinfo_x86 prev_info;
pr_err("Attempting late microcode loading - it is dangerous and taints the kernel.\n");
pr_err("You should switch to early loading, if possible.\n");
@@ -466,7 +467,7 @@ static int microcode_reload_late(void)
ret = stop_machine_cpuslocked(__reload_late, NULL, cpu_online_mask);
if (ret == 0)
- microcode_check();
+ microcode_check(&prev_info);
pr_info("Reload completed, microcode revision: 0x%x -> 0x%x\n",
old, boot_cpu_data.microcode);
--
2.39.3

135
SOURCES/1028-x86-microcode-Check-CPU-capabilities-after-late-micr.patch Normal file
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@ -0,0 +1,135 @@
From a8cd7508b4dfd8cedd394da8cdb0253f18bdb1a8 Mon Sep 17 00:00:00 2001
From: Ashok Raj <ashok.raj@intel.com>
Date: Mon, 9 Jan 2023 07:35:51 -0800
Subject: [PATCH 14/36] x86/microcode: Check CPU capabilities after late
microcode update correctly
The kernel caches each CPU's feature bits at boot in an x86_capability[]
structure. However, the capabilities in the BSP's copy can be turned off
as a result of certain command line parameters or configuration
restrictions, for example the SGX bit. This can cause a mismatch when
comparing the values before and after the microcode update.
microcode_check() is called after an update to report any previously
cached CPUID bits which might have changed due to the update.
Therefore, store the cached CPU caps before the update and compare them
with the CPU caps after the microcode update has succeeded.
Thus, the comparison is done between the CPUID *hardware* bits before
and after the upgrade instead of using the cached, possibly runtime
modified values in BSP's boot_cpu_data copy.
As a result, false warnings about CPUID bits changes are avoided.
[ bp:
- Massage.
- Add SRBDS_CTRL example.
- Add kernel-doc.
- Incorporate forgotten review feedback from dhansen.
]
Fixes: 1008c52c09dc ("x86/CPU: Add a microcode loader callback")
Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230109153555.4986-3-ashok.raj@intel.com
(cherry picked from commit c0dd9245aa9e25a697181f6085692272c9ec61bc)
CVE: CVE-2023-20593
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/include/asm/processor.h | 1 +
arch/x86/kernel/cpu/common.c | 36 ++++++++++++++++++----------
arch/x86/kernel/cpu/microcode/core.c | 6 +++++
3 files changed, 30 insertions(+), 13 deletions(-)
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 9968d456d7e8..820104bdee1f 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -920,6 +920,7 @@ bool xen_set_default_idle(void);
void stop_this_cpu(void *dummy);
void df_debug(struct pt_regs *regs, long error_code);
void microcode_check(struct cpuinfo_x86 *prev_info);
+void store_cpu_caps(struct cpuinfo_x86 *info);
enum l1tf_mitigations {
L1TF_MITIGATION_OFF,
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 437fe55acce8..22763a691b7b 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -2146,6 +2146,25 @@ void cpu_init_secondary(void)
#endif
#ifdef CONFIG_MICROCODE_LATE_LOADING
+/**
+ * store_cpu_caps() - Store a snapshot of CPU capabilities
+ * @curr_info: Pointer where to store it
+ *
+ * Returns: None
+ */
+void store_cpu_caps(struct cpuinfo_x86 *curr_info)
+{
+ /* Reload CPUID max function as it might've changed. */
+ curr_info->cpuid_level = cpuid_eax(0);
+
+ /* Copy all capability leafs and pick up the synthetic ones. */
+ memcpy(&curr_info->x86_capability, &boot_cpu_data.x86_capability,
+ sizeof(curr_info->x86_capability));
+
+ /* Get the hardware CPUID leafs */
+ get_cpu_cap(curr_info);
+}
+
/**
* microcode_check() - Check if any CPU capabilities changed after an update.
* @prev_info: CPU capabilities stored before an update.
@@ -2158,22 +2177,13 @@ void cpu_init_secondary(void)
*/
void microcode_check(struct cpuinfo_x86 *prev_info)
{
- perf_check_microcode();
-
- /* Reload CPUID max function as it might've changed. */
- prev_info->cpuid_level = cpuid_eax(0);
+ struct cpuinfo_x86 curr_info;
- /*
- * Copy all capability leafs to pick up the synthetic ones so that
- * memcmp() below doesn't fail on that. The ones coming from CPUID will
- * get overwritten in get_cpu_cap().
- */
- memcpy(&prev_info->x86_capability, &boot_cpu_data.x86_capability,
- sizeof(prev_info->x86_capability));
+ perf_check_microcode();
- get_cpu_cap(prev_info);
+ store_cpu_caps(&curr_info);
- if (!memcmp(&prev_info->x86_capability, &boot_cpu_data.x86_capability,
+ if (!memcmp(&prev_info->x86_capability, &curr_info.x86_capability,
sizeof(prev_info->x86_capability)))
return;
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 41a90074df21..9df2c40a4ddf 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -465,6 +465,12 @@ static int microcode_reload_late(void)
atomic_set(&late_cpus_in, 0);
atomic_set(&late_cpus_out, 0);
+ /*
+ * Take a snapshot before the microcode update in order to compare and
+ * check whether any bits changed after an update.
+ */
+ store_cpu_caps(&prev_info);
+
ret = stop_machine_cpuslocked(__reload_late, NULL, cpu_online_mask);
if (ret == 0)
microcode_check(&prev_info);
--
2.39.3

54
SOURCES/1029-x86-microcode-Adjust-late-loading-result-reporting-m.patch Normal file
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@ -0,0 +1,54 @@
From 527c5ac4a29d4b854b10586ea877c65174cbd40d Mon Sep 17 00:00:00 2001
From: Ashok Raj <ashok.raj@intel.com>
Date: Mon, 9 Jan 2023 07:35:52 -0800
Subject: [PATCH 15/36] x86/microcode: Adjust late loading result reporting
message
During late microcode loading, the "Reload completed" message is issued
unconditionally, regardless of success or failure.
Adjust the message to report the result of the update.
[ bp: Massage. ]
Fixes: 9bd681251b7c ("x86/microcode: Announce reload operation's completion")
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/lkml/874judpqqd.ffs@tglx/
(cherry picked from commit 6eab3abac7043226e5375e9ead0c7607ced6767b)
CVE: CVE-2023-20593
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/kernel/cpu/microcode/core.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 9df2c40a4ddf..fb383088bede 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -472,11 +472,14 @@ static int microcode_reload_late(void)
store_cpu_caps(&prev_info);
ret = stop_machine_cpuslocked(__reload_late, NULL, cpu_online_mask);
- if (ret == 0)
+ if (!ret) {
+ pr_info("Reload succeeded, microcode revision: 0x%x -> 0x%x\n",
+ old, boot_cpu_data.microcode);
microcode_check(&prev_info);
-
- pr_info("Reload completed, microcode revision: 0x%x -> 0x%x\n",
- old, boot_cpu_data.microcode);
+ } else {
+ pr_info("Reload failed, current microcode revision: 0x%x\n",
+ boot_cpu_data.microcode);
+ }
return ret;
}
--
2.39.3

148
SOURCES/1030-x86-amd-Cache-debug-register-values-in-percpu-variab.patch Normal file
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@ -0,0 +1,148 @@
From e167d6613aef8356261f97e2b50489142f8e1406 Mon Sep 17 00:00:00 2001
From: Alexey Kardashevskiy <aik@amd.com>
Date: Fri, 20 Jan 2023 14:10:45 +1100
Subject: [PATCH 16/36] x86/amd: Cache debug register values in percpu
variables
Reading DR[0-3]_ADDR_MASK MSRs takes about 250 cycles which is going to
be noticeable with the AMD KVM SEV-ES DebugSwap feature enabled. KVM is
going to store host's DR[0-3] and DR[0-3]_ADDR_MASK before switching to
a guest; the hardware is going to swap these on VMRUN and VMEXIT.
Store MSR values passed to set_dr_addr_mask() in percpu variables
(when changed) and return them via new amd_get_dr_addr_mask().
The gain here is about 10x.
As set_dr_addr_mask() uses the array too, change the @dr type to
unsigned to avoid checking for <0. And give it the amd_ prefix to match
the new helper as the whole DR_ADDR_MASK feature is AMD-specific anyway.
While at it, replace deprecated boot_cpu_has() with cpu_feature_enabled()
in set_dr_addr_mask().
Signed-off-by: Alexey Kardashevskiy <aik@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230120031047.628097-2-aik@amd.com
(cherry picked from commit 7914695743d598b189d549f2f57af24aa5633705)
The conflict is due to patch 84b6a34 which is not present
in this repo. This is an optimization/not a bug fix. Hence
not porting it.
CVE: CVE-2023-20593
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/include/asm/debugreg.h | 9 +++++--
arch/x86/kernel/cpu/amd.c | 47 +++++++++++++++++++++++----------
arch/x86/kernel/hw_breakpoint.c | 4 +--
3 files changed, 42 insertions(+), 18 deletions(-)
diff --git a/arch/x86/include/asm/debugreg.h b/arch/x86/include/asm/debugreg.h
index 1c964123f2dd..ccf6639c8df9 100644
--- a/arch/x86/include/asm/debugreg.h
+++ b/arch/x86/include/asm/debugreg.h
@@ -144,9 +144,14 @@ static __always_inline void local_db_restore(unsigned long dr7)
}
#ifdef CONFIG_CPU_SUP_AMD
-extern void set_dr_addr_mask(unsigned long mask, int dr);
+extern void amd_set_dr_addr_mask(unsigned long mask, unsigned int dr);
+extern unsigned long amd_get_dr_addr_mask(unsigned int dr);
#else
-static inline void set_dr_addr_mask(unsigned long mask, int dr) { }
+static inline void amd_set_dr_addr_mask(unsigned long mask, unsigned int dr) { }
+static inline unsigned long amd_get_dr_addr_mask(unsigned int dr)
+{
+ return 0;
+}
#endif
#endif /* _ASM_X86_DEBUGREG_H */
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index efa49b3f87b9..6eb7923f5f08 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -1146,24 +1146,43 @@ static bool cpu_has_amd_erratum(struct cpuinfo_x86 *cpu, const int *erratum)
return false;
}
-void set_dr_addr_mask(unsigned long mask, int dr)
+static DEFINE_PER_CPU_READ_MOSTLY(unsigned long[4], amd_dr_addr_mask);
+
+static unsigned int amd_msr_dr_addr_masks[] = {
+ MSR_F16H_DR0_ADDR_MASK,
+ MSR_F16H_DR1_ADDR_MASK,
+ MSR_F16H_DR1_ADDR_MASK + 1,
+ MSR_F16H_DR1_ADDR_MASK + 2
+};
+
+void amd_set_dr_addr_mask(unsigned long mask, unsigned int dr)
{
- if (!boot_cpu_has(X86_FEATURE_BPEXT))
+ int cpu = smp_processor_id();
+
+ if (!cpu_feature_enabled(X86_FEATURE_BPEXT))
return;
- switch (dr) {
- case 0:
- wrmsr(MSR_F16H_DR0_ADDR_MASK, mask, 0);
- break;
- case 1:
- case 2:
- case 3:
- wrmsr(MSR_F16H_DR1_ADDR_MASK - 1 + dr, mask, 0);
- break;
- default:
- break;
- }
+ if (WARN_ON_ONCE(dr >= ARRAY_SIZE(amd_msr_dr_addr_masks)))
+ return;
+
+ if (per_cpu(amd_dr_addr_mask, cpu)[dr] == mask)
+ return;
+
+ wrmsr(amd_msr_dr_addr_masks[dr], mask, 0);
+ per_cpu(amd_dr_addr_mask, cpu)[dr] = mask;
+}
+
+unsigned long amd_get_dr_addr_mask(unsigned int dr)
+{
+ if (!cpu_feature_enabled(X86_FEATURE_BPEXT))
+ return 0;
+
+ if (WARN_ON_ONCE(dr >= ARRAY_SIZE(amd_msr_dr_addr_masks)))
+ return 0;
+
+ return per_cpu(amd_dr_addr_mask[dr], smp_processor_id());
}
+EXPORT_SYMBOL_GPL(amd_get_dr_addr_mask);
u32 amd_get_highest_perf(void)
{
diff --git a/arch/x86/kernel/hw_breakpoint.c b/arch/x86/kernel/hw_breakpoint.c
index 3871950432d6..d38d4648512d 100644
--- a/arch/x86/kernel/hw_breakpoint.c
+++ b/arch/x86/kernel/hw_breakpoint.c
@@ -129,7 +129,7 @@ int arch_install_hw_breakpoint(struct perf_event *bp)
set_debugreg(*dr7, 7);
if (info->mask)
- set_dr_addr_mask(info->mask, i);
+ amd_set_dr_addr_mask(info->mask, i);
return 0;
}
@@ -166,7 +166,7 @@ void arch_uninstall_hw_breakpoint(struct perf_event *bp)
set_debugreg(*dr7, 7);
if (info->mask)
- set_dr_addr_mask(0, i);
+ amd_set_dr_addr_mask(0, i);
}
static int arch_bp_generic_len(int x86_len)
--
2.39.3

94
SOURCES/1031-x86-microcode-Remove-request_microcode_user.patch Normal file
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@ -0,0 +1,94 @@
From a53f36400559990c1a3716f11ecb46c03cc7cde7 Mon Sep 17 00:00:00 2001
From: Borislav Petkov <bp@suse.de>
Date: Thu, 25 Aug 2022 09:51:57 +0200
Subject: [PATCH 17/36] x86/microcode: Remove ->request_microcode_user()
181b6f40e9ea ("x86/microcode: Rip out the OLD_INTERFACE")
removed the old microcode loading interface but forgot to remove the
related ->request_microcode_user() functionality which it uses.
Rip it out now too.
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20220825075445.28171-1-bp@alien8.de
(cherry picked from commit 8c61eafd22d7207039bff85c6e1d386f15abd17e)
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/include/asm/microcode.h | 3 ---
arch/x86/kernel/cpu/microcode/amd.c | 7 -------
arch/x86/kernel/cpu/microcode/intel.c | 17 -----------------
3 files changed, 27 deletions(-)
diff --git a/arch/x86/include/asm/microcode.h b/arch/x86/include/asm/microcode.h
index a930a63d1260..215ea340e7f9 100644
--- a/arch/x86/include/asm/microcode.h
+++ b/arch/x86/include/asm/microcode.h
@@ -32,9 +32,6 @@ enum ucode_state {
};
struct microcode_ops {
- enum ucode_state (*request_microcode_user) (int cpu,
- const void __user *buf, size_t size);
-
enum ucode_state (*request_microcode_fw) (int cpu, struct device *,
bool refresh_fw);
diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 0b557d04be22..9d15b7e5a13e 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -929,12 +929,6 @@ static enum ucode_state request_microcode_amd(int cpu, struct device *device,
return ret;
}
-static enum ucode_state
-request_microcode_user(int cpu, const void __user *buf, size_t size)
-{
- return UCODE_ERROR;
-}
-
static void microcode_fini_cpu_amd(int cpu)
{
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
@@ -943,7 +937,6 @@ static void microcode_fini_cpu_amd(int cpu)
}
static struct microcode_ops microcode_amd_ops = {
- .request_microcode_user = request_microcode_user,
.request_microcode_fw = request_microcode_amd,
.collect_cpu_info = collect_cpu_info_amd,
.apply_microcode = apply_microcode_amd,
diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 5f8223909db4..6fa667192bd9 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -952,24 +952,7 @@ static enum ucode_state request_microcode_fw(int cpu, struct device *device,
return ret;
}
-static enum ucode_state
-request_microcode_user(int cpu, const void __user *buf, size_t size)
-{
- struct iov_iter iter;
- struct iovec iov;
-
- if (is_blacklisted(cpu))
- return UCODE_NFOUND;
-
- iov.iov_base = (void __user *)buf;
- iov.iov_len = size;
- iov_iter_init(&iter, WRITE, &iov, 1, size);
-
- return generic_load_microcode(cpu, &iter);
-}
-
static struct microcode_ops microcode_intel_ops = {
- .request_microcode_user = request_microcode_user,
.request_microcode_fw = request_microcode_fw,
.collect_cpu_info = collect_cpu_info,
.apply_microcode = apply_microcode_intel,
--
2.39.3

88
SOURCES/1032-x86-microcode-Kill-refresh_fw.patch Normal file
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@ -0,0 +1,88 @@
From f93ce31159692d4be33e05f6a63361c7b9a29292 Mon Sep 17 00:00:00 2001
From: Borislav Petkov <bp@suse.de>
Date: Wed, 19 Oct 2022 19:16:20 +0200
Subject: [PATCH 18/36] x86/microcode: Kill refresh_fw
request_microcode_fw() can always request firmware now so drop this
superfluous argument.
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Ashok Raj <ashok.raj@intel.com>
Link: https://lore.kernel.org/r/20221028142638.28498-4-bp@alien8.de
(cherry picked from commit a61ac80ae52ea349416472cd52005f9988537208)
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/include/asm/microcode.h | 3 +--
arch/x86/kernel/cpu/microcode/amd.c | 5 ++---
arch/x86/kernel/cpu/microcode/core.c | 2 +-
arch/x86/kernel/cpu/microcode/intel.c | 3 +--
4 files changed, 5 insertions(+), 8 deletions(-)
diff --git a/arch/x86/include/asm/microcode.h b/arch/x86/include/asm/microcode.h
index 215ea340e7f9..af1ba544c800 100644
--- a/arch/x86/include/asm/microcode.h
+++ b/arch/x86/include/asm/microcode.h
@@ -32,8 +32,7 @@ enum ucode_state {
};
struct microcode_ops {
- enum ucode_state (*request_microcode_fw) (int cpu, struct device *,
- bool refresh_fw);
+ enum ucode_state (*request_microcode_fw) (int cpu, struct device *);
void (*microcode_fini_cpu) (int cpu);
diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 9d15b7e5a13e..381addff7fc8 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -895,8 +895,7 @@ load_microcode_amd(bool save, u8 family, const u8 *data, size_t size)
*
* These might be larger than 2K.
*/
-static enum ucode_state request_microcode_amd(int cpu, struct device *device,
- bool refresh_fw)
+static enum ucode_state request_microcode_amd(int cpu, struct device *device)
{
char fw_name[36] = "amd-ucode/microcode_amd.bin";
struct cpuinfo_x86 *c = &cpu_data(cpu);
@@ -905,7 +904,7 @@ static enum ucode_state request_microcode_amd(int cpu, struct device *device,
const struct firmware *fw;
/* reload ucode container only on the boot cpu */
- if (!refresh_fw || !bsp)
+ if (!bsp)
return UCODE_OK;
if (c->x86 >= 0x15)
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index fb383088bede..3d4c2c1aae11 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -506,7 +506,7 @@ static ssize_t reload_store(struct device *dev,
if (ret)
goto put;
- tmp_ret = microcode_ops->request_microcode_fw(bsp, &microcode_pdev->dev, true);
+ tmp_ret = microcode_ops->request_microcode_fw(bsp, &microcode_pdev->dev);
if (tmp_ret != UCODE_NEW)
goto put;
diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 6fa667192bd9..818d5fa8ca20 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -921,8 +921,7 @@ static bool is_blacklisted(unsigned int cpu)
return false;
}
-static enum ucode_state request_microcode_fw(int cpu, struct device *device,
- bool refresh_fw)
+static enum ucode_state request_microcode_fw(int cpu, struct device *device)
{
struct cpuinfo_x86 *c = &cpu_data(cpu);
const struct firmware *firmware;
--
2.39.3

92
SOURCES/1033-x86-microcode-amd-Remove-load_microcode_amd-s-bsp-pa.patch Normal file
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@ -0,0 +1,92 @@
From cb425451860828e0ac0516f58a37b131f0476b3c Mon Sep 17 00:00:00 2001
From: "Borislav Petkov (AMD)" <bp@alien8.de>
Date: Tue, 17 Jan 2023 23:59:24 +0100
Subject: [PATCH 19/36] x86/microcode/amd: Remove load_microcode_amd()'s bsp
parameter
It is always the BSP.
No functional changes.
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230130161709.11615-2-bp@alien8.de
(cherry picked from commit 2355370cd941cbb20882cc3f34460f9f2b8f9a18)
CVE: CVE-2023-20593
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/kernel/cpu/microcode/amd.c | 19 ++++---------------
1 file changed, 4 insertions(+), 15 deletions(-)
diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 381addff7fc8..68643a68fa11 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -547,8 +547,7 @@ void load_ucode_amd_ap(unsigned int cpuid_1_eax)
early_apply_microcode(cpuid_1_eax, cp.data, cp.size, false);
}
-static enum ucode_state
-load_microcode_amd(bool save, u8 family, const u8 *data, size_t size);
+static enum ucode_state load_microcode_amd(u8 family, const u8 *data, size_t size);
int __init save_microcode_in_initrd_amd(unsigned int cpuid_1_eax)
{
@@ -566,7 +565,7 @@ int __init save_microcode_in_initrd_amd(unsigned int cpuid_1_eax)
if (!desc.mc)
return -EINVAL;
- ret = load_microcode_amd(true, x86_family(cpuid_1_eax), desc.data, desc.size);
+ ret = load_microcode_amd(x86_family(cpuid_1_eax), desc.data, desc.size);
if (ret > UCODE_UPDATED)
return -EINVAL;
@@ -844,8 +843,7 @@ static enum ucode_state __load_microcode_amd(u8 family, const u8 *data,
return UCODE_OK;
}
-static enum ucode_state
-load_microcode_amd(bool save, u8 family, const u8 *data, size_t size)
+static enum ucode_state load_microcode_amd(u8 family, const u8 *data, size_t size)
{
struct ucode_patch *p;
enum ucode_state ret;
@@ -869,10 +867,6 @@ load_microcode_amd(bool save, u8 family, const u8 *data, size_t size)
ret = UCODE_NEW;
}
- /* save BSP's matching patch for early load */
- if (!save)
- return ret;
-
memset(amd_ucode_patch, 0, PATCH_MAX_SIZE);
memcpy(amd_ucode_patch, p->data, min_t(u32, ksize(p->data), PATCH_MAX_SIZE));
@@ -899,14 +893,9 @@ static enum ucode_state request_microcode_amd(int cpu, struct device *device)
{
char fw_name[36] = "amd-ucode/microcode_amd.bin";
struct cpuinfo_x86 *c = &cpu_data(cpu);
- bool bsp = c->cpu_index == boot_cpu_data.cpu_index;
enum ucode_state ret = UCODE_NFOUND;
const struct firmware *fw;
- /* reload ucode container only on the boot cpu */
- if (!bsp)
- return UCODE_OK;
-
if (c->x86 >= 0x15)
snprintf(fw_name, sizeof(fw_name), "amd-ucode/microcode_amd_fam%.2xh.bin", c->x86);
@@ -919,7 +908,7 @@ static enum ucode_state request_microcode_amd(int cpu, struct device *device)
if (!verify_container(fw->data, fw->size, false))
goto fw_release;
- ret = load_microcode_amd(bsp, c->x86, fw->data, fw->size);
+ ret = load_microcode_amd(c->x86, fw->data, fw->size);
fw_release:
release_firmware(fw);
--
2.39.3

62
SOURCES/1034-x86-microcode-Drop-struct-ucode_cpu_info.valid.patch Normal file
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@ -0,0 +1,62 @@
From fbc8e41bf83779c3c6727075c5d131a3aa9f7a2b Mon Sep 17 00:00:00 2001
From: Borislav Petkov <bp@suse.de>
Date: Wed, 19 Oct 2022 19:25:27 +0200
Subject: [PATCH 20/36] x86/microcode: Drop struct ucode_cpu_info.valid
It is not needed anymore.
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Ashok Raj <ashok.raj@intel.com>
Link: https://lore.kernel.org/r/20221028142638.28498-6-bp@alien8.de
(cherry picked from commit 254ed7cf4dd79a18bbc496ab53f6c82d45431c78)
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/include/asm/microcode.h | 1 -
arch/x86/kernel/cpu/intel.c | 1 -
arch/x86/kernel/cpu/microcode/core.c | 4 ++--
3 files changed, 2 insertions(+), 4 deletions(-)
diff --git a/arch/x86/include/asm/microcode.h b/arch/x86/include/asm/microcode.h
index af1ba544c800..e65c39a1f5fa 100644
--- a/arch/x86/include/asm/microcode.h
+++ b/arch/x86/include/asm/microcode.h
@@ -48,7 +48,6 @@ struct microcode_ops {
struct ucode_cpu_info {
struct cpu_signature cpu_sig;
- int valid;
void *mc;
};
extern struct ucode_cpu_info ucode_cpu_info[];
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index cf85431fb09a..c7935482c58a 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -243,7 +243,6 @@ int intel_cpu_collect_info(struct ucode_cpu_info *uci)
csig.rev = intel_get_microcode_revision();
uci->cpu_sig = csig;
- uci->valid = 1;
return 0;
}
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 3d4c2c1aae11..6cd0db1e7b96 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -583,9 +583,9 @@ void microcode_bsp_resume(void)
int cpu = smp_processor_id();
struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
- if (uci->valid && uci->mc)
+ if (uci->mc)
microcode_ops->apply_microcode(cpu);
- else if (!uci->mc)
+ else
reload_early_microcode();
}
--
2.39.3

110
SOURCES/1035-x86-microcode-AMD-Add-a-cpu-parameter-to-the-reloadi.patch Normal file
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@ -0,0 +1,110 @@
From 077f4f2e376a6489736ee5994db3539593941c0c Mon Sep 17 00:00:00 2001
From: "Borislav Petkov (AMD)" <bp@alien8.de>
Date: Thu, 26 Jan 2023 00:08:03 +0100
Subject: [PATCH 21/36] x86/microcode/AMD: Add a @cpu parameter to the
reloading functions
Will be used in a subsequent change.
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230130161709.11615-3-bp@alien8.de
(cherry picked from commit a5ad92134bd153a9ccdcddf09a95b088f36c3cce)
CVE: CVE-2023-20593
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/include/asm/microcode.h | 4 ++--
arch/x86/include/asm/microcode_amd.h | 4 ++--
arch/x86/kernel/cpu/microcode/amd.c | 2 +-
arch/x86/kernel/cpu/microcode/core.c | 6 +++---
4 files changed, 8 insertions(+), 8 deletions(-)
diff --git a/arch/x86/include/asm/microcode.h b/arch/x86/include/asm/microcode.h
index e65c39a1f5fa..67051a58a18b 100644
--- a/arch/x86/include/asm/microcode.h
+++ b/arch/x86/include/asm/microcode.h
@@ -125,7 +125,7 @@ static inline unsigned int x86_cpuid_family(void)
int __init microcode_init(void);
extern void __init load_ucode_bsp(void);
extern void load_ucode_ap(void);
-void reload_early_microcode(void);
+void reload_early_microcode(unsigned int cpu);
extern bool get_builtin_firmware(struct cpio_data *cd, const char *name);
extern bool initrd_gone;
void microcode_bsp_resume(void);
@@ -133,7 +133,7 @@ void microcode_bsp_resume(void);
static inline int __init microcode_init(void) { return 0; };
static inline void __init load_ucode_bsp(void) { }
static inline void load_ucode_ap(void) { }
-static inline void reload_early_microcode(void) { }
+static inline void reload_early_microcode(unsigned int cpu) { }
static inline bool
get_builtin_firmware(struct cpio_data *cd, const char *name) { return false; }
static inline void microcode_bsp_resume(void) { }
diff --git a/arch/x86/include/asm/microcode_amd.h b/arch/x86/include/asm/microcode_amd.h
index 7063b5a43220..a645b25ee442 100644
--- a/arch/x86/include/asm/microcode_amd.h
+++ b/arch/x86/include/asm/microcode_amd.h
@@ -47,12 +47,12 @@ struct microcode_amd {
extern void __init load_ucode_amd_bsp(unsigned int family);
extern void load_ucode_amd_ap(unsigned int family);
extern int __init save_microcode_in_initrd_amd(unsigned int family);
-void reload_ucode_amd(void);
+void reload_ucode_amd(unsigned int cpu);
#else
static inline void __init load_ucode_amd_bsp(unsigned int family) {}
static inline void load_ucode_amd_ap(unsigned int family) {}
static inline int __init
save_microcode_in_initrd_amd(unsigned int family) { return -EINVAL; }
-static inline void reload_ucode_amd(void) {}
+static inline void reload_ucode_amd(unsigned int cpu) {}
#endif
#endif /* _ASM_X86_MICROCODE_AMD_H */
diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 68643a68fa11..6ab27650f8a7 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -572,7 +572,7 @@ int __init save_microcode_in_initrd_amd(unsigned int cpuid_1_eax)
return 0;
}
-void reload_ucode_amd(void)
+void reload_ucode_amd(unsigned int cpu)
{
struct microcode_amd *mc;
u32 rev, dummy __always_unused;
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 6cd0db1e7b96..681df41e5b69 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -317,7 +317,7 @@ struct cpio_data find_microcode_in_initrd(const char *path, bool use_pa)
#endif
}
-void reload_early_microcode(void)
+void reload_early_microcode(unsigned int cpu)
{
int vendor, family;
@@ -331,7 +331,7 @@ void reload_early_microcode(void)
break;
case X86_VENDOR_AMD:
if (family >= 0x10)
- reload_ucode_amd();
+ reload_ucode_amd(cpu);
break;
default:
break;
@@ -586,7 +586,7 @@ void microcode_bsp_resume(void)
if (uci->mc)
microcode_ops->apply_microcode(cpu);
else
- reload_early_microcode();
+ reload_early_microcode(cpu);
}
static struct syscore_ops mc_syscore_ops = {
--
2.39.3

63
SOURCES/1036-x86-microcode-AMD-Track-patch-allocation-size-explic.patch Normal file
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@ -0,0 +1,63 @@
From d9032189bbe791846b2c3e224ae164e106e2be1b Mon Sep 17 00:00:00 2001
From: Kees Cook <keescook@chromium.org>
Date: Wed, 21 Sep 2022 20:10:10 -0700
Subject: [PATCH 22/36] x86/microcode/AMD: Track patch allocation size
explicitly
In preparation for reducing the use of ksize(), record the actual
allocation size for later memcpy(). This avoids copying extra
(uninitialized!) bytes into the patch buffer when the requested
allocation size isn't exactly the size of a kmalloc bucket.
Additionally, fix potential future issues where runtime bounds checking
will notice that the buffer was allocated to a smaller value than
returned by ksize().
Fixes: 757885e94a22 ("x86, microcode, amd: Early microcode patch loading support for AMD")
Suggested-by: Daniel Micay <danielmicay@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/lkml/CA+DvKQ+bp7Y7gmaVhacjv9uF6Ar-o4tet872h4Q8RPYPJjcJQA@mail.gmail.com/
(cherry picked from commit 712f210a457d9c32414df246a72781550bc23ef6)
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/include/asm/microcode.h | 1 +
arch/x86/kernel/cpu/microcode/amd.c | 3 ++-
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/microcode.h b/arch/x86/include/asm/microcode.h
index 67051a58a18b..629330986955 100644
--- a/arch/x86/include/asm/microcode.h
+++ b/arch/x86/include/asm/microcode.h
@@ -9,6 +9,7 @@
struct ucode_patch {
struct list_head plist;
void *data; /* Intel uses only this one */
+ unsigned int size;
u32 patch_id;
u16 equiv_cpu;
};
diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 6ab27650f8a7..030f69f93c00 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -791,6 +791,7 @@ static int verify_and_add_patch(u8 family, u8 *fw, unsigned int leftover,
kfree(patch);
return -EINVAL;
}
+ patch->size = *patch_size;
mc_hdr = (struct microcode_header_amd *)(fw + SECTION_HDR_SIZE);
proc_id = mc_hdr->processor_rev_id;
@@ -868,7 +869,7 @@ static enum ucode_state load_microcode_amd(u8 family, const u8 *data, size_t siz
}
memset(amd_ucode_patch, 0, PATCH_MAX_SIZE);
- memcpy(amd_ucode_patch, p->data, min_t(u32, ksize(p->data), PATCH_MAX_SIZE));
+ memcpy(amd_ucode_patch, p->data, min_t(u32, p->size, PATCH_MAX_SIZE));
return ret;
}
--
2.39.3

111
SOURCES/1037-x86-microcode-AMD-Fix-mixed-steppings-support.patch Normal file
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@ -0,0 +1,111 @@
From 34d3d5458f58c88954bb3087219610f35e2b5c37 Mon Sep 17 00:00:00 2001
From: "Borislav Petkov (AMD)" <bp@alien8.de>
Date: Thu, 26 Jan 2023 16:26:17 +0100
Subject: [PATCH 23/36] x86/microcode/AMD: Fix mixed steppings support
The AMD side of the loader has always claimed to support mixed
steppings. But somewhere along the way, it broke that by assuming that
the cached patch blob is a single one instead of it being one per
*node*.
So turn it into a per-node one so that each node can stash the blob
relevant for it.
[ NB: Fixes tag is not really the exactly correct one but it is good
enough. ]
Fixes: fe055896c040 ("x86/microcode: Merge the early microcode loader")
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: <stable@kernel.org> # 2355370cd941 ("x86/microcode/amd: Remove load_microcode_amd()'s bsp parameter")
Cc: <stable@kernel.org> # a5ad92134bd1 ("x86/microcode/AMD: Add a @cpu parameter to the reloading functions")
Link: https://lore.kernel.org/r/20230130161709.11615-4-bp@alien8.de
(cherry picked from commit 7ff6edf4fef38ab404ee7861f257e28eaaeed35f)
CVE: CVE-2023-20593
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/kernel/cpu/microcode/amd.c | 34 ++++++++++++++++++-----------
1 file changed, 21 insertions(+), 13 deletions(-)
diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 030f69f93c00..d1d31011b8fa 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -55,7 +55,9 @@ struct cont_desc {
};
static u32 ucode_new_rev;
-static u8 amd_ucode_patch[PATCH_MAX_SIZE];
+
+/* One blob per node. */
+static u8 amd_ucode_patch[MAX_NUMNODES][PATCH_MAX_SIZE];
/*
* Microcode patch container file is prepended to the initrd in cpio
@@ -428,7 +430,7 @@ static bool early_apply_microcode(u32 cpuid_1_eax, void *ucode, size_t size, boo
patch = (u8 (*)[PATCH_MAX_SIZE])__pa_nodebug(&amd_ucode_patch);
#else
new_rev = &ucode_new_rev;
- patch = &amd_ucode_patch;
+ patch = &amd_ucode_patch[0];
#endif
desc.cpuid_1_eax = cpuid_1_eax;
@@ -574,10 +576,10 @@ int __init save_microcode_in_initrd_amd(unsigned int cpuid_1_eax)
void reload_ucode_amd(unsigned int cpu)
{
- struct microcode_amd *mc;
u32 rev, dummy __always_unused;
+ struct microcode_amd *mc;
- mc = (struct microcode_amd *)amd_ucode_patch;
+ mc = (struct microcode_amd *)amd_ucode_patch[cpu_to_node(cpu)];
rdmsr(MSR_AMD64_PATCH_LEVEL, rev, dummy);
@@ -846,6 +848,8 @@ static enum ucode_state __load_microcode_amd(u8 family, const u8 *data,
static enum ucode_state load_microcode_amd(u8 family, const u8 *data, size_t size)
{
+ struct cpuinfo_x86 *c;
+ unsigned int nid, cpu;
struct ucode_patch *p;
enum ucode_state ret;
@@ -858,18 +862,22 @@ static enum ucode_state load_microcode_amd(u8 family, const u8 *data, size_t siz
return ret;
}
- p = find_patch(0);
- if (!p) {
- return ret;
- } else {
- if (boot_cpu_data.microcode >= p->patch_id)
- return ret;
+ for_each_node(nid) {
+ cpu = cpumask_first(cpumask_of_node(nid));
+ c = &cpu_data(cpu);
+
+ p = find_patch(cpu);
+ if (!p)
+ continue;
+
+ if (c->microcode >= p->patch_id)
+ continue;
ret = UCODE_NEW;
- }
- memset(amd_ucode_patch, 0, PATCH_MAX_SIZE);
- memcpy(amd_ucode_patch, p->data, min_t(u32, p->size, PATCH_MAX_SIZE));
+ memset(&amd_ucode_patch[nid], 0, PATCH_MAX_SIZE);
+ memcpy(&amd_ucode_patch[nid], p->data, min_t(u32, p->size, PATCH_MAX_SIZE));
+ }
return ret;
}
--
2.39.3

40
SOURCES/1038-x86-microcode-core-Return-an-error-only-when-necessa.patch Normal file
View File

@ -0,0 +1,40 @@
From c6dc156a35536e30bb96df8a1b8c93cb16bd219b Mon Sep 17 00:00:00 2001
From: "Borislav Petkov (AMD)" <bp@alien8.de>
Date: Mon, 30 Jan 2023 13:48:04 +0100
Subject: [PATCH 24/36] x86/microcode/core: Return an error only when necessary
Return an error from the late loading function which is run on each CPU
only when an error has actually been encountered during the update.
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230130161709.11615-5-bp@alien8.de
(cherry picked from commit f33e0c893b22bf94d7985f1f2aa3872237560c74)
CVE: CVE-2023-20593
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/kernel/cpu/microcode/core.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 681df41e5b69..23b88e66fa7c 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -428,10 +428,10 @@ static int __reload_late(void *info)
goto wait_for_siblings;
if (err >= UCODE_NFOUND) {
- if (err == UCODE_ERROR)
+ if (err == UCODE_ERROR) {
pr_warn("Error reloading microcode on CPU %d\n", cpu);
-
- ret = -1;
+ ret = -1;
+ }
}
wait_for_siblings:
--
2.39.3

225
SOURCES/1039-x86-apic-Don-t-disable-x2APIC-if-locked.patch Normal file
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@ -0,0 +1,225 @@
From ce57ab2e87f50d1176abea086f4aad38ba87886b Mon Sep 17 00:00:00 2001
From: Daniel Sneddon <daniel.sneddon@linux.intel.com>
Date: Tue, 16 Aug 2022 16:19:42 -0700
Subject: [PATCH 25/36] x86/apic: Don't disable x2APIC if locked
The APIC supports two modes, legacy APIC (or xAPIC), and Extended APIC
(or x2APIC). X2APIC mode is mostly compatible with legacy APIC, but
it disables the memory-mapped APIC interface in favor of one that uses
MSRs. The APIC mode is controlled by the EXT bit in the APIC MSR.
The MMIO/xAPIC interface has some problems, most notably the APIC LEAK
[1]. This bug allows an attacker to use the APIC MMIO interface to
extract data from the SGX enclave.
Introduce support for a new feature that will allow the BIOS to lock
the APIC in x2APIC mode. If the APIC is locked in x2APIC mode and the
kernel tries to disable the APIC or revert to legacy APIC mode a GP
fault will occur.
Introduce support for a new MSR (IA32_XAPIC_DISABLE_STATUS) and handle
the new locked mode when the LEGACY_XAPIC_DISABLED bit is set by
preventing the kernel from trying to disable the x2APIC.
On platforms with the IA32_XAPIC_DISABLE_STATUS MSR, if SGX or TDX are
enabled the LEGACY_XAPIC_DISABLED will be set by the BIOS. If
legacy APIC is required, then it SGX and TDX need to be disabled in the
BIOS.
[1]: https://aepicleak.com/aepicleak.pdf
Signed-off-by: Daniel Sneddon <daniel.sneddon@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Tested-by: Neelima Krishnan <neelima.krishnan@intel.com>
Link: https://lkml.kernel.org/r/20220816231943.1152579-1-daniel.sneddon@linux.intel.com
(cherry picked from commit b8d1d163604bd1e600b062fb00de5dc42baa355f)
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
.../admin-guide/kernel-parameters.txt | 4 ++
arch/x86/Kconfig | 7 ++-
arch/x86/include/asm/cpu.h | 2 +
arch/x86/include/asm/msr-index.h | 13 ++++++
arch/x86/kernel/apic/apic.c | 44 +++++++++++++++++--
5 files changed, 65 insertions(+), 5 deletions(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 25f0b3a543e9..73a92fb9e3c6 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -3355,6 +3355,10 @@
nox2apic [X86-64,APIC] Do not enable x2APIC mode.
+ NOTE: this parameter will be ignored on systems with the
+ LEGACY_XAPIC_DISABLED bit set in the
+ IA32_XAPIC_DISABLE_STATUS MSR.
+
cpu0_hotplug [X86] Turn on CPU0 hotplug feature when
CONFIG_BOOTPARAM_HOTPLUG_CPU0 is off.
Some features depend on CPU0. Known dependencies are:
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 5af5427c50ae..585893a349b6 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -449,6 +449,11 @@ config X86_X2APIC
This allows 32-bit apic IDs (so it can support very large systems),
and accesses the local apic via MSRs not via mmio.
+ Some Intel systems circa 2022 and later are locked into x2APIC mode
+ and can not fall back to the legacy APIC modes if SGX or TDX are
+ enabled in the BIOS. They will be unable to boot without enabling
+ this option.
+
If you don't know what to do here, say N.
config X86_MPPARSE
@@ -1979,7 +1984,7 @@ endchoice
config X86_SGX
bool "Software Guard eXtensions (SGX)"
- depends on X86_64 && CPU_SUP_INTEL
+ depends on X86_64 && CPU_SUP_INTEL && X86_X2APIC
depends on CRYPTO=y
depends on CRYPTO_SHA256=y
select SRCU
diff --git a/arch/x86/include/asm/cpu.h b/arch/x86/include/asm/cpu.h
index 2d62a3f122ee..66f9715b01c9 100644
--- a/arch/x86/include/asm/cpu.h
+++ b/arch/x86/include/asm/cpu.h
@@ -92,4 +92,6 @@ static inline bool intel_cpu_signatures_match(unsigned int s1, unsigned int p1,
return p1 & p2;
}
+extern u64 x86_read_arch_cap_msr(void);
+
#endif /* _ASM_X86_CPU_H */
diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index e30f8e289deb..9b0d407dd1ae 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -153,6 +153,11 @@
* Return Stack Buffer Predictions.
*/
+#define ARCH_CAP_XAPIC_DISABLE BIT(21) /*
+ * IA32_XAPIC_DISABLE_STATUS MSR
+ * supported
+ */
+
#define MSR_IA32_FLUSH_CMD 0x0000010b
#define L1D_FLUSH BIT(0) /*
* Writeback and invalidate the
@@ -1015,4 +1020,12 @@
#define MSR_IA32_HW_FEEDBACK_PTR 0x17d0
#define MSR_IA32_HW_FEEDBACK_CONFIG 0x17d1
+/* x2APIC locked status */
+#define MSR_IA32_XAPIC_DISABLE_STATUS 0xBD
+#define LEGACY_XAPIC_DISABLED BIT(0) /*
+ * x2APIC mode is locked and
+ * disabling x2APIC will cause
+ * a #GP
+ */
+
#endif /* _ASM_X86_MSR_INDEX_H */
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index b191e575e53c..d73f1037961a 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -57,6 +57,7 @@
#include <asm/cpu_device_id.h>
#include <asm/intel-family.h>
#include <asm/irq_regs.h>
+#include <asm/cpu.h>
unsigned int num_processors;
@@ -1734,11 +1735,26 @@ EXPORT_SYMBOL_GPL(x2apic_mode);
enum {
X2APIC_OFF,
- X2APIC_ON,
X2APIC_DISABLED,
+ /* All states below here have X2APIC enabled */
+ X2APIC_ON,
+ X2APIC_ON_LOCKED
};
static int x2apic_state;
+static bool x2apic_hw_locked(void)
+{
+ u64 ia32_cap;
+ u64 msr;
+
+ ia32_cap = x86_read_arch_cap_msr();
+ if (ia32_cap & ARCH_CAP_XAPIC_DISABLE) {
+ rdmsrl(MSR_IA32_XAPIC_DISABLE_STATUS, msr);
+ return (msr & LEGACY_XAPIC_DISABLED);
+ }
+ return false;
+}
+
static void __x2apic_disable(void)
{
u64 msr;
@@ -1776,6 +1792,10 @@ static int __init setup_nox2apic(char *str)
apicid);
return 0;
}
+ if (x2apic_hw_locked()) {
+ pr_warn("APIC locked in x2apic mode, can't disable\n");
+ return 0;
+ }
pr_warn("x2apic already enabled.\n");
__x2apic_disable();
}
@@ -1790,10 +1810,18 @@ early_param("nox2apic", setup_nox2apic);
void x2apic_setup(void)
{
/*
- * If x2apic is not in ON state, disable it if already enabled
+ * Try to make the AP's APIC state match that of the BSP, but if the
+ * BSP is unlocked and the AP is locked then there is a state mismatch.
+ * Warn about the mismatch in case a GP fault occurs due to a locked AP
+ * trying to be turned off.
+ */
+ if (x2apic_state != X2APIC_ON_LOCKED && x2apic_hw_locked())
+ pr_warn("x2apic lock mismatch between BSP and AP.\n");
+ /*
+ * If x2apic is not in ON or LOCKED state, disable it if already enabled
* from BIOS.
*/
- if (x2apic_state != X2APIC_ON) {
+ if (x2apic_state < X2APIC_ON) {
__x2apic_disable();
return;
}
@@ -1814,6 +1842,11 @@ static __init void x2apic_disable(void)
if (x2apic_id >= 255)
panic("Cannot disable x2apic, id: %08x\n", x2apic_id);
+ if (x2apic_hw_locked()) {
+ pr_warn("Cannot disable locked x2apic, id: %08x\n", x2apic_id);
+ return;
+ }
+
__x2apic_disable();
register_lapic_address(mp_lapic_addr);
}
@@ -1872,7 +1905,10 @@ void __init check_x2apic(void)
if (x2apic_enabled()) {
pr_info("x2apic: enabled by BIOS, switching to x2apic ops\n");
x2apic_mode = 1;
- x2apic_state = X2APIC_ON;
+ if (x2apic_hw_locked())
+ x2apic_state = X2APIC_ON_LOCKED;
+ else
+ x2apic_state = X2APIC_ON;
} else if (!boot_cpu_has(X86_FEATURE_X2APIC)) {
x2apic_state = X2APIC_DISABLED;
}
--
2.39.3

186
SOURCES/1040-x86-cpu-amd-Move-the-errata-checking-functionality-u.patch Normal file
View File

@ -0,0 +1,186 @@
From 53173ac5885435f751b54a87710e6111a51a819c Mon Sep 17 00:00:00 2001
From: "Borislav Petkov (AMD)" <bp@alien8.de>
Date: Sat, 15 Jul 2023 13:31:32 +0200
Subject: [PATCH 26/36] x86/cpu/amd: Move the errata checking functionality up
Avoid new and remove old forward declarations.
No functional changes.
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
(cherry picked from commit 8b6f687743dacce83dbb0c7cfacf88bab00f808a)
CVE: CVE-2023-20593
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/kernel/cpu/amd.c | 139 ++++++++++++++++++--------------------
1 file changed, 67 insertions(+), 72 deletions(-)
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 6eb7923f5f08..2406a71a1eb6 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -26,11 +26,6 @@
#include "cpu.h"
-static const int amd_erratum_383[];
-static const int amd_erratum_400[];
-static const int amd_erratum_1054[];
-static bool cpu_has_amd_erratum(struct cpuinfo_x86 *cpu, const int *erratum);
-
/*
* nodes_per_socket: Stores the number of nodes per socket.
* Refer to Fam15h Models 00-0fh BKDG - CPUID Fn8000_001E_ECX
@@ -38,6 +33,73 @@ static bool cpu_has_amd_erratum(struct cpuinfo_x86 *cpu, const int *erratum);
*/
static u32 nodes_per_socket = 1;
+/*
+ * AMD errata checking
+ *
+ * Errata are defined as arrays of ints using the AMD_LEGACY_ERRATUM() or
+ * AMD_OSVW_ERRATUM() macros. The latter is intended for newer errata that
+ * have an OSVW id assigned, which it takes as first argument. Both take a
+ * variable number of family-specific model-stepping ranges created by
+ * AMD_MODEL_RANGE().
+ *
+ * Example:
+ *
+ * const int amd_erratum_319[] =
+ * AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0x4, 0x2),
+ * AMD_MODEL_RANGE(0x10, 0x8, 0x0, 0x8, 0x0),
+ * AMD_MODEL_RANGE(0x10, 0x9, 0x0, 0x9, 0x0));
+ */
+
+#define AMD_LEGACY_ERRATUM(...) { -1, __VA_ARGS__, 0 }
+#define AMD_OSVW_ERRATUM(osvw_id, ...) { osvw_id, __VA_ARGS__, 0 }
+#define AMD_MODEL_RANGE(f, m_start, s_start, m_end, s_end) \
+ ((f << 24) | (m_start << 16) | (s_start << 12) | (m_end << 4) | (s_end))
+#define AMD_MODEL_RANGE_FAMILY(range) (((range) >> 24) & 0xff)
+#define AMD_MODEL_RANGE_START(range) (((range) >> 12) & 0xfff)
+#define AMD_MODEL_RANGE_END(range) ((range) & 0xfff)
+
+static const int amd_erratum_400[] =
+ AMD_OSVW_ERRATUM(1, AMD_MODEL_RANGE(0xf, 0x41, 0x2, 0xff, 0xf),
+ AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0xff, 0xf));
+
+static const int amd_erratum_383[] =
+ AMD_OSVW_ERRATUM(3, AMD_MODEL_RANGE(0x10, 0, 0, 0xff, 0xf));
+
+/* #1054: Instructions Retired Performance Counter May Be Inaccurate */
+static const int amd_erratum_1054[] =
+ AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x17, 0, 0, 0x2f, 0xf));
+
+static bool cpu_has_amd_erratum(struct cpuinfo_x86 *cpu, const int *erratum)
+{
+ int osvw_id = *erratum++;
+ u32 range;
+ u32 ms;
+
+ if (osvw_id >= 0 && osvw_id < 65536 &&
+ cpu_has(cpu, X86_FEATURE_OSVW)) {
+ u64 osvw_len;
+
+ rdmsrl(MSR_AMD64_OSVW_ID_LENGTH, osvw_len);
+ if (osvw_id < osvw_len) {
+ u64 osvw_bits;
+
+ rdmsrl(MSR_AMD64_OSVW_STATUS + (osvw_id >> 6),
+ osvw_bits);
+ return osvw_bits & (1ULL << (osvw_id & 0x3f));
+ }
+ }
+
+ /* OSVW unavailable or ID unknown, match family-model-stepping range */
+ ms = (cpu->x86_model << 4) | cpu->x86_stepping;
+ while ((range = *erratum++))
+ if ((cpu->x86 == AMD_MODEL_RANGE_FAMILY(range)) &&
+ (ms >= AMD_MODEL_RANGE_START(range)) &&
+ (ms <= AMD_MODEL_RANGE_END(range)))
+ return true;
+
+ return false;
+}
+
static inline int rdmsrl_amd_safe(unsigned msr, unsigned long long *p)
{
u32 gprs[8] = { 0 };
@@ -1079,73 +1141,6 @@ static const struct cpu_dev amd_cpu_dev = {
cpu_dev_register(amd_cpu_dev);
-/*
- * AMD errata checking
- *
- * Errata are defined as arrays of ints using the AMD_LEGACY_ERRATUM() or
- * AMD_OSVW_ERRATUM() macros. The latter is intended for newer errata that
- * have an OSVW id assigned, which it takes as first argument. Both take a
- * variable number of family-specific model-stepping ranges created by
- * AMD_MODEL_RANGE().
- *
- * Example:
- *
- * const int amd_erratum_319[] =
- * AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0x4, 0x2),
- * AMD_MODEL_RANGE(0x10, 0x8, 0x0, 0x8, 0x0),
- * AMD_MODEL_RANGE(0x10, 0x9, 0x0, 0x9, 0x0));
- */
-
-#define AMD_LEGACY_ERRATUM(...) { -1, __VA_ARGS__, 0 }
-#define AMD_OSVW_ERRATUM(osvw_id, ...) { osvw_id, __VA_ARGS__, 0 }
-#define AMD_MODEL_RANGE(f, m_start, s_start, m_end, s_end) \
- ((f << 24) | (m_start << 16) | (s_start << 12) | (m_end << 4) | (s_end))
-#define AMD_MODEL_RANGE_FAMILY(range) (((range) >> 24) & 0xff)
-#define AMD_MODEL_RANGE_START(range) (((range) >> 12) & 0xfff)
-#define AMD_MODEL_RANGE_END(range) ((range) & 0xfff)
-
-static const int amd_erratum_400[] =
- AMD_OSVW_ERRATUM(1, AMD_MODEL_RANGE(0xf, 0x41, 0x2, 0xff, 0xf),
- AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0xff, 0xf));
-
-static const int amd_erratum_383[] =
- AMD_OSVW_ERRATUM(3, AMD_MODEL_RANGE(0x10, 0, 0, 0xff, 0xf));
-
-/* #1054: Instructions Retired Performance Counter May Be Inaccurate */
-static const int amd_erratum_1054[] =
- AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x17, 0, 0, 0x2f, 0xf));
-
-static bool cpu_has_amd_erratum(struct cpuinfo_x86 *cpu, const int *erratum)
-{
- int osvw_id = *erratum++;
- u32 range;
- u32 ms;
-
- if (osvw_id >= 0 && osvw_id < 65536 &&
- cpu_has(cpu, X86_FEATURE_OSVW)) {
- u64 osvw_len;
-
- rdmsrl(MSR_AMD64_OSVW_ID_LENGTH, osvw_len);
- if (osvw_id < osvw_len) {
- u64 osvw_bits;
-
- rdmsrl(MSR_AMD64_OSVW_STATUS + (osvw_id >> 6),
- osvw_bits);
- return osvw_bits & (1ULL << (osvw_id & 0x3f));
- }
- }
-
- /* OSVW unavailable or ID unknown, match family-model-stepping range */
- ms = (cpu->x86_model << 4) | cpu->x86_stepping;
- while ((range = *erratum++))
- if ((cpu->x86 == AMD_MODEL_RANGE_FAMILY(range)) &&
- (ms >= AMD_MODEL_RANGE_START(range)) &&
- (ms <= AMD_MODEL_RANGE_END(range)))
- return true;
-
- return false;
-}
-
static DEFINE_PER_CPU_READ_MOSTLY(unsigned long[4], amd_dr_addr_mask);
static unsigned int amd_msr_dr_addr_masks[] = {
--
2.39.3

63
SOURCES/1041-x86-cpu-Remove-redundant-extern-x86_read_arch_cap_ms.patch Normal file
View File

@ -0,0 +1,63 @@
From d2d2944b80b99ecdcb1c10b0704bbdf78fbf5f79 Mon Sep 17 00:00:00 2001
From: Ashok Raj <ashok.raj@intel.com>
Date: Mon, 28 Nov 2022 09:24:51 -0800
Subject: [PATCH 27/36] x86/cpu: Remove redundant extern
x86_read_arch_cap_msr()
The prototype for the x86_read_arch_cap_msr() function has moved to
arch/x86/include/asm/cpu.h - kill the redundant definition in arch/x86/kernel/cpu.h
and include the header.
Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Daniel Sneddon <daniel.sneddon@linux.intel.com>
Link: https://lore.kernel.org/r/20221128172451.792595-1-ashok.raj@intel.com
(cherry picked from commit bb5525a50601f8be7d0ffb04740e1714506e60c4)
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/kernel/cpu/bugs.c | 1 +
arch/x86/kernel/cpu/cpu.h | 2 --
arch/x86/kernel/cpu/tsx.c | 1 +
3 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 848a0cce2243..5dc79427d047 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -33,6 +33,7 @@
#include <asm/e820/api.h>
#include <asm/hypervisor.h>
#include <asm/tlbflush.h>
+#include <asm/cpu.h>
#include "cpu.h"
diff --git a/arch/x86/kernel/cpu/cpu.h b/arch/x86/kernel/cpu/cpu.h
index 54afd004624b..1add3618f766 100644
--- a/arch/x86/kernel/cpu/cpu.h
+++ b/arch/x86/kernel/cpu/cpu.h
@@ -84,8 +84,6 @@ unsigned int aperfmperf_get_khz(int cpu);
extern void x86_spec_ctrl_setup_ap(void);
extern void update_srbds_msr(void);
-extern u64 x86_read_arch_cap_msr(void);
-
#ifdef CONFIG_IA32_FEAT_CTL
void init_ia32_feat_ctl(struct cpuinfo_x86 *c);
#endif
diff --git a/arch/x86/kernel/cpu/tsx.c b/arch/x86/kernel/cpu/tsx.c
index 39b3e65c9c8d..73b7226d042b 100644
--- a/arch/x86/kernel/cpu/tsx.c
+++ b/arch/x86/kernel/cpu/tsx.c
@@ -11,6 +11,7 @@
#include <linux/cpufeature.h>
#include <asm/cmdline.h>
+#include <asm/cpu.h>
#include "cpu.h"
--
2.39.3

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@ -0,0 +1,77 @@
From 58f7b0c78ff579aef5a470804ff76e4ed913056b Mon Sep 17 00:00:00 2001
From: Kim Phillips <kim.phillips@amd.com>
Date: Tue, 10 Jan 2023 16:46:37 -0600
Subject: [PATCH 28/36] x86/cpu, kvm: Add support for CPUID_80000021_EAX
Add support for CPUID leaf 80000021, EAX. The majority of the features will be
used in the kernel and thus a separate leaf is appropriate.
Include KVM's reverse_cpuid entry because features are used by VM guests, too.
[ bp: Massage commit message. ]
Signed-off-by: Kim Phillips <kim.phillips@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20230124163319.2277355-2-kim.phillips@amd.com
(cherry picked from commit 8415a74852d7c24795007ee9862d25feb519007c)
The conflicts in arch/x86/include/asm/cpufeature.h,
arch/x86/include/asm/cpufeatures.h, arch/x86/include/asm/disabled-features.h
and arch/x86/include/asm/required-features.h are due to
the below commit added for kABI compatibility:
Repo: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/:
commit: 219a085bc8ba328d65a1e12bc1886415525a38d9
The conflict in arch/x86/kvm/reverse_cpuid.h is due to
upstream commit 24d74b9f5f2a972ac9228372adeac62b2dc10ea2
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/include/asm/cpufeature.h | 1 +
arch/x86/kernel/cpu/common.c | 3 +++
arch/x86/kvm/reverse_cpuid.h | 1 +
3 files changed, 5 insertions(+)
diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index 925722baef7c..3b2473cdf2ad 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -31,6 +31,7 @@ enum cpuid_leafs
CPUID_8000_0007_EBX,
CPUID_7_EDX,
CPUID_8000_001F_EAX,
+ CPUID_8000_0021_EAX,
};
#ifdef CONFIG_X86_FEATURE_NAMES
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 22763a691b7b..a8dfd75588cd 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -962,6 +962,9 @@ void get_cpu_cap(struct cpuinfo_x86 *c)
if (c->extended_cpuid_level >= 0x8000001f)
c->x86_capability[CPUID_8000_001F_EAX] = cpuid_eax(0x8000001f);
+ if (c->extended_cpuid_level >= 0x80000021)
+ c->x86_capability[CPUID_8000_0021_EAX] = cpuid_eax(0x80000021);
+
init_scattered_cpuid_features(c);
init_speculation_control(c);
diff --git a/arch/x86/kvm/reverse_cpuid.h b/arch/x86/kvm/reverse_cpuid.h
index a19d473d0184..7eeade35a425 100644
--- a/arch/x86/kvm/reverse_cpuid.h
+++ b/arch/x86/kvm/reverse_cpuid.h
@@ -48,6 +48,7 @@ static const struct cpuid_reg reverse_cpuid[] = {
[CPUID_7_1_EAX] = { 7, 1, CPUID_EAX},
[CPUID_12_EAX] = {0x00000012, 0, CPUID_EAX},
[CPUID_8000_001F_EAX] = {0x8000001f, 0, CPUID_EAX},
+ [CPUID_8000_0021_EAX] = {0x80000021, 0, CPUID_EAX},
};
/*
--
2.39.3

43
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@ -0,0 +1,43 @@
From 35b7cde8ddf1c374c533ec0de2958d2cd74e587d Mon Sep 17 00:00:00 2001
From: Jim Mattson <jmattson@google.com>
Date: Fri, 7 Oct 2022 15:16:44 -0700
Subject: [PATCH 29/36] KVM: x86: Advertise that the SMM_CTL MSR is not
supported
CPUID.80000021H:EAX[bit 9] indicates that the SMM_CTL MSR (0xc0010116) is
not supported. This defeature can be advertised by KVM_GET_SUPPORTED_CPUID
regardless of whether or not the host enumerates it; currently it will be
included only if the host enumerates at least leaf 8000001DH, due to a
preexisting bug in QEMU that KVM has to work around (commit f751d8eac176,
"KVM: x86: work around QEMU issue with synthetic CPUID leaves", 2022-04-29).
Signed-off-by: Jim Mattson <jmattson@google.com>
Message-Id: <20221007221644.138355-1-jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit 74bee0cad8dcd8ddec5e763c369239fc5990676a)
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/kvm/cpuid.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 6e3f385a3648..3726861ae52a 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -1180,8 +1180,12 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
* Other defined bits are for MSRs that KVM does not expose:
* EAX 3 SPCL, SMM page configuration lock
* EAX 13 PCMSR, Prefetch control MSR
+ *
+ * KVM doesn't support SMM_CTL.
+ * EAX 9 SMM_CTL MSR is not supported
*/
entry->eax &= BIT(0) | BIT(2) | BIT(6);
+ entry->eax |= BIT(9);
if (static_cpu_has(X86_FEATURE_LFENCE_RDTSC))
entry->eax |= BIT(2);
if (!static_cpu_has_bug(X86_BUG_NULL_SEG))
--
2.39.3

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@ -0,0 +1,84 @@
From d8cd9882c866de836235c5761b11e1bc4272508e Mon Sep 17 00:00:00 2001
From: Kim Phillips <kim.phillips@amd.com>
Date: Tue, 24 Jan 2023 10:33:13 -0600
Subject: [PATCH 30/36] KVM: x86: Move open-coded CPUID leaf 0x80000021 EAX bit
propagation code
Move code from __do_cpuid_func() to kvm_set_cpu_caps() in preparation for adding
the features in their native leaf.
Also drop the bit description comments as it will be more self-describing once
the individual features are added.
Whilst there, switch to using the more efficient cpu_feature_enabled() instead
of static_cpu_has().
Note, LFENCE_RDTSC and "NULL selector clears base" are currently synthetic,
Linux-defined feature flags as Linux tracking of the features predates AMD's
definition. Keep the manual propagation of the flags from their synthetic
counterparts until the kernel fully converts to AMD's definition, otherwise KVM
would stop synthesizing the flags as intended.
Signed-off-by: Kim Phillips <kim.phillips@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20230124163319.2277355-3-kim.phillips@amd.com
(cherry picked from commit c35ac8c4bf600ee23bacb20f863aa7830efb23fb)
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/kvm/cpuid.c | 31 ++++++++++++-------------------
1 file changed, 12 insertions(+), 19 deletions(-)
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 3726861ae52a..2ca5ac683c44 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -682,6 +682,17 @@ void kvm_set_cpu_caps(void)
0 /* SME */ | F(SEV) | 0 /* VM_PAGE_FLUSH */ | F(SEV_ES) |
F(SME_COHERENT));
+ kvm_cpu_cap_mask(CPUID_8000_0021_EAX,
+ BIT(0) /* NO_NESTED_DATA_BP */ |
+ BIT(2) /* LFENCE Always serializing */ | 0 /* SmmPgCfgLock */ |
+ BIT(6) /* NULL_SEL_CLR_BASE */ | 0 /* PrefetchCtlMsr */
+ );
+ if (cpu_feature_enabled(X86_FEATURE_LFENCE_RDTSC))
+ kvm_cpu_caps[CPUID_8000_0021_EAX] |= BIT(2) /* LFENCE Always serializing */;
+ if (!static_cpu_has_bug(X86_BUG_NULL_SEG))
+ kvm_cpu_caps[CPUID_8000_0021_EAX] |= BIT(6) /* NULL_SEL_CLR_BASE */;
+ kvm_cpu_caps[CPUID_8000_0021_EAX] |= BIT(9) /* NO_SMM_CTL_MSR */;
+
kvm_cpu_cap_mask(CPUID_C000_0001_EDX,
F(XSTORE) | F(XSTORE_EN) | F(XCRYPT) | F(XCRYPT_EN) |
F(ACE2) | F(ACE2_EN) | F(PHE) | F(PHE_EN) |
@@ -1171,25 +1182,7 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
break;
case 0x80000021:
entry->ebx = entry->ecx = entry->edx = 0;
- /*
- * Pass down these bits:
- * EAX 0 NNDBP, Processor ignores nested data breakpoints
- * EAX 2 LAS, LFENCE always serializing
- * EAX 6 NSCB, Null selector clear base
- *
- * Other defined bits are for MSRs that KVM does not expose:
- * EAX 3 SPCL, SMM page configuration lock
- * EAX 13 PCMSR, Prefetch control MSR
- *
- * KVM doesn't support SMM_CTL.
- * EAX 9 SMM_CTL MSR is not supported
- */
- entry->eax &= BIT(0) | BIT(2) | BIT(6);
- entry->eax |= BIT(9);
- if (static_cpu_has(X86_FEATURE_LFENCE_RDTSC))
- entry->eax |= BIT(2);
- if (!static_cpu_has_bug(X86_BUG_NULL_SEG))
- entry->eax |= BIT(6);
+ cpuid_entry_override(entry, CPUID_8000_0021_EAX);
break;
/*Add support for Centaur's CPUID instruction*/
case 0xC0000000:
--
2.39.3

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@ -0,0 +1,51 @@
From a1116fd67a3178ce220ee6c2c8abe6bf792e26f2 Mon Sep 17 00:00:00 2001
From: Kim Phillips <kim.phillips@amd.com>
Date: Tue, 24 Jan 2023 10:33:14 -0600
Subject: [PATCH 31/36] x86/cpu, kvm: Add the NO_NESTED_DATA_BP feature
The "Processor ignores nested data breakpoints" feature was being
open-coded for KVM. Add the feature to its newly introduced CPUID leaf
0x80000021 EAX proper.
Signed-off-by: Kim Phillips <kim.phillips@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20230124163319.2277355-4-kim.phillips@amd.com
(cherry picked from commit a9dc9ec5a1fafc3d2fe7a7b594eefaeaccf89a6b)
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/include/asm/cpufeatures.h | 3 +++
arch/x86/kvm/cpuid.c | 2 +-
2 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index ffc806d3a863..ac6e58a79fad 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -421,6 +421,9 @@
#define X86_FEATURE_IBRS_EXIT_SET (22*32+ 0) /* "" Set IBRS on kernel exit */
#define X86_FEATURE_IBRS_EXIT_SKIP (22*32+ 1) /* "" Skip SPEC_CTRL MSR write on exit */
+/* AMD-defined Extended Feature 2 EAX, CPUID level 0x80000021 (EAX), word 20 */
+#define X86_FEATURE_NO_NESTED_DATA_BP (20*32+ 0) /* "" No Nested Data Breakpoints */
+
/*
* BUG word(s)
*/
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 2ca5ac683c44..1a8dbad7e2d9 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -683,7 +683,7 @@ void kvm_set_cpu_caps(void)
F(SME_COHERENT));
kvm_cpu_cap_mask(CPUID_8000_0021_EAX,
- BIT(0) /* NO_NESTED_DATA_BP */ |
+ F(NO_NESTED_DATA_BP) |
BIT(2) /* LFENCE Always serializing */ | 0 /* SmmPgCfgLock */ |
BIT(6) /* NULL_SEL_CLR_BASE */ | 0 /* PrefetchCtlMsr */
);
--
2.39.3

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@ -0,0 +1,148 @@
From 97e9891f4f6253ec70fc870e639d7e4d07b9e361 Mon Sep 17 00:00:00 2001
From: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Date: Wed, 30 Nov 2022 07:25:51 -0800
Subject: [PATCH 32/36] x86/bugs: Make sure MSR_SPEC_CTRL is updated properly
upon resume from S3
The "force" argument to write_spec_ctrl_current() is currently ambiguous
as it does not guarantee the MSR write. This is due to the optimization
that writes to the MSR happen only when the new value differs from the
cached value.
This is fine in most cases, but breaks for S3 resume when the cached MSR
value gets out of sync with the hardware MSR value due to S3 resetting
it.
When x86_spec_ctrl_current is same as x86_spec_ctrl_base, the MSR write
is skipped. Which results in SPEC_CTRL mitigations not getting restored.
Move the MSR write from write_spec_ctrl_current() to a new function that
unconditionally writes to the MSR. Update the callers accordingly and
rename functions.
[ bp: Rework a bit. ]
Fixes: caa0ff24d5d0 ("x86/bugs: Keep a per-CPU IA32_SPEC_CTRL value")
Suggested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: <stable@kernel.org>
Link: https://lore.kernel.org/r/806d39b0bfec2fe8f50dc5446dff20f5bb24a959.1669821572.git.pawan.kumar.gupta@linux.intel.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
(cherry picked from commit 66065157420c5b9b3f078f43d313c153e1ff7f83)
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/include/asm/nospec-branch.h | 2 +-
arch/x86/kernel/cpu/bugs.c | 21 ++++++++++++++-------
arch/x86/kernel/process.c | 2 +-
3 files changed, 16 insertions(+), 9 deletions(-)
diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h
index 442e62e7be47..53e56fc9cf70 100644
--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -318,7 +318,7 @@ static inline void indirect_branch_prediction_barrier(void)
/* The Intel SPEC CTRL MSR base value cache */
extern u64 x86_spec_ctrl_base;
DECLARE_PER_CPU(u64, x86_spec_ctrl_current);
-extern void write_spec_ctrl_current(u64 val, bool force);
+extern void update_spec_ctrl_cond(u64 val);
extern u64 spec_ctrl_current(void);
/*
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 5dc79427d047..53623ea69873 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -60,11 +60,18 @@ EXPORT_SYMBOL_GPL(x86_spec_ctrl_current);
static DEFINE_MUTEX(spec_ctrl_mutex);
+/* Update SPEC_CTRL MSR and its cached copy unconditionally */
+static void update_spec_ctrl(u64 val)
+{
+ this_cpu_write(x86_spec_ctrl_current, val);
+ wrmsrl(MSR_IA32_SPEC_CTRL, val);
+}
+
/*
* Keep track of the SPEC_CTRL MSR value for the current task, which may differ
* from x86_spec_ctrl_base due to STIBP/SSB in __speculation_ctrl_update().
*/
-void write_spec_ctrl_current(u64 val, bool force)
+void update_spec_ctrl_cond(u64 val)
{
if (this_cpu_read(x86_spec_ctrl_current) == val)
return;
@@ -76,7 +83,7 @@ void write_spec_ctrl_current(u64 val, bool force)
* forced or the exit MSR write is skipped the update can be delayed
* until that time.
*/
- if (force || !cpu_feature_enabled(X86_FEATURE_KERNEL_IBRS) ||
+ if (!cpu_feature_enabled(X86_FEATURE_KERNEL_IBRS) ||
cpu_feature_enabled(X86_FEATURE_IBRS_EXIT_SKIP))
wrmsrl(MSR_IA32_SPEC_CTRL, val);
}
@@ -1308,7 +1315,7 @@ static void __init spec_ctrl_disable_kernel_rrsba(void)
if (ia32_cap & ARCH_CAP_RRSBA) {
x86_spec_ctrl_base |= SPEC_CTRL_RRSBA_DIS_S;
- write_spec_ctrl_current(x86_spec_ctrl_base, true);
+ update_spec_ctrl(x86_spec_ctrl_base);
}
}
@@ -1440,7 +1447,7 @@ static void __init spectre_v2_select_mitigation(void)
if (spectre_v2_in_ibrs_mode(mode)) {
x86_spec_ctrl_base |= SPEC_CTRL_IBRS;
- write_spec_ctrl_current(x86_spec_ctrl_base, true);
+ update_spec_ctrl(x86_spec_ctrl_base);
}
switch (mode) {
@@ -1565,7 +1572,7 @@ static void __init spectre_v2_select_mitigation(void)
static void update_stibp_msr(void * __unused)
{
u64 val = spec_ctrl_current() | (x86_spec_ctrl_base & SPEC_CTRL_STIBP);
- write_spec_ctrl_current(val, true);
+ update_spec_ctrl(val);
}
/* Update x86_spec_ctrl_base in case SMT state changed. */
@@ -1798,7 +1805,7 @@ static enum ssb_mitigation __init __ssb_select_mitigation(void)
x86_amd_ssb_disable();
} else {
x86_spec_ctrl_base |= SPEC_CTRL_SSBD;
- write_spec_ctrl_current(x86_spec_ctrl_base, true);
+ update_spec_ctrl(x86_spec_ctrl_base);
}
}
@@ -2016,7 +2023,7 @@ int arch_prctl_spec_ctrl_get(struct task_struct *task, unsigned long which)
void x86_spec_ctrl_setup_ap(void)
{
if (boot_cpu_has(X86_FEATURE_MSR_SPEC_CTRL))
- write_spec_ctrl_current(x86_spec_ctrl_base, true);
+ update_spec_ctrl(x86_spec_ctrl_base);
if (ssb_mode == SPEC_STORE_BYPASS_DISABLE)
x86_amd_ssb_disable();
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 87bcb25ff8b2..a62f200aa736 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -583,7 +583,7 @@ static __always_inline void __speculation_ctrl_update(unsigned long tifp,
}
if (updmsr)
- write_spec_ctrl_current(msr, false);
+ update_spec_ctrl_cond(msr);
}
static unsigned long speculation_ctrl_update_tif(struct task_struct *tsk)
--
2.39.3

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@ -0,0 +1,209 @@
From 6b575d67beff6c1ce5f7643cb9326327170114a8 Mon Sep 17 00:00:00 2001
From: Kim Phillips <kim.phillips@amd.com>
Date: Tue, 24 Jan 2023 10:33:18 -0600
Subject: [PATCH 33/36] x86/cpu: Support AMD Automatic IBRS
The AMD Zen4 core supports a new feature called Automatic IBRS.
It is a "set-and-forget" feature that means that, like Intel's Enhanced IBRS,
h/w manages its IBRS mitigation resources automatically across CPL transitions.
The feature is advertised by CPUID_Fn80000021_EAX bit 8 and is enabled by
setting MSR C000_0080 (EFER) bit 21.
Enable Automatic IBRS by default if the CPU feature is present. It typically
provides greater performance over the incumbent generic retpolines mitigation.
Reuse the SPECTRE_V2_EIBRS spectre_v2_mitigation enum. AMD Automatic IBRS and
Intel Enhanced IBRS have similar enablement. Add NO_EIBRS_PBRSB to
cpu_vuln_whitelist, since AMD Automatic IBRS isn't affected by PBRSB-eIBRS.
The kernel command line option spectre_v2=eibrs is used to select AMD Automatic
IBRS, if available.
Signed-off-by: Kim Phillips <kim.phillips@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Sean Christopherson <seanjc@google.com>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lore.kernel.org/r/20230124163319.2277355-8-kim.phillips@amd.com
(cherry picked from commit e7862eda309ecfccc36bb5558d937ed3ace07f3f)
Also add fix 06cb31cc761823ef444ba4e1df11347342a6e745 upstream found
while resolving conflicts. It's a minor doc change.
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
Documentation/admin-guide/hw-vuln/spectre.rst | 7 ++++---
.../admin-guide/kernel-parameters.txt | 6 +++---
arch/x86/include/asm/cpufeatures.h | 1 +
arch/x86/include/asm/msr-index.h | 2 ++
arch/x86/kernel/cpu/bugs.c | 20 +++++++++++--------
arch/x86/kernel/cpu/common.c | 17 +++++++++-------
6 files changed, 32 insertions(+), 21 deletions(-)
diff --git a/Documentation/admin-guide/hw-vuln/spectre.rst b/Documentation/admin-guide/hw-vuln/spectre.rst
index fb2572ed9674..bf161b5aa98f 100644
--- a/Documentation/admin-guide/hw-vuln/spectre.rst
+++ b/Documentation/admin-guide/hw-vuln/spectre.rst
@@ -610,9 +610,10 @@ kernel command line.
retpoline,generic Retpolines
retpoline,lfence LFENCE; indirect branch
retpoline,amd alias for retpoline,lfence
- eibrs enhanced IBRS
- eibrs,retpoline enhanced IBRS + Retpolines
- eibrs,lfence enhanced IBRS + LFENCE
+ eibrs Enhanced/Auto IBRS
+ eibrs,retpoline Enhanced/Auto IBRS + Retpolines
+ eibrs,lfence Enhanced/Auto IBRS + LFENCE
+ ibrs use IBRS to protect kernel
Not specifying this option is equivalent to
spectre_v2=auto.
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 73a92fb9e3c6..b6da8048f62c 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -4968,9 +4968,9 @@
retpoline,generic - Retpolines
retpoline,lfence - LFENCE; indirect branch
retpoline,amd - alias for retpoline,lfence
- eibrs - enhanced IBRS
- eibrs,retpoline - enhanced IBRS + Retpolines
- eibrs,lfence - enhanced IBRS + LFENCE
+ eibrs - Enhanced/Auto IBRS
+ eibrs,retpoline - Enhanced/Auto IBRS + Retpolines
+ eibrs,lfence - Enhanced/Auto IBRS + LFENCE
ibrs - use IBRS to protect kernel
ibrs_always - use IBRS to protect both kernel
and userland
diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index ac6e58a79fad..316b11ea50ca 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -423,6 +423,7 @@
/* AMD-defined Extended Feature 2 EAX, CPUID level 0x80000021 (EAX), word 20 */
#define X86_FEATURE_NO_NESTED_DATA_BP (20*32+ 0) /* "" No Nested Data Breakpoints */
+#define X86_FEATURE_AUTOIBRS (20*32+ 8) /* "" Automatic IBRS */
/*
* BUG word(s)
diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index 9b0d407dd1ae..bf54eb786776 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -30,6 +30,7 @@
#define _EFER_SVME 12 /* Enable virtualization */
#define _EFER_LMSLE 13 /* Long Mode Segment Limit Enable */
#define _EFER_FFXSR 14 /* Enable Fast FXSAVE/FXRSTOR */
+#define _EFER_AUTOIBRS 21 /* Enable Automatic IBRS */
#define EFER_SCE (1<<_EFER_SCE)
#define EFER_LME (1<<_EFER_LME)
@@ -38,6 +39,7 @@
#define EFER_SVME (1<<_EFER_SVME)
#define EFER_LMSLE (1<<_EFER_LMSLE)
#define EFER_FFXSR (1<<_EFER_FFXSR)
+#define EFER_AUTOIBRS (1<<_EFER_AUTOIBRS)
/* Intel MSRs. Some also available on other CPUs */
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 53623ea69873..43295a878b8f 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -1177,9 +1177,9 @@ static const char * const spectre_v2_strings[] = {
[SPECTRE_V2_NONE] = "Vulnerable",
[SPECTRE_V2_RETPOLINE] = "Mitigation: Retpolines",
[SPECTRE_V2_LFENCE] = "Mitigation: LFENCE",
- [SPECTRE_V2_EIBRS] = "Mitigation: Enhanced IBRS",
- [SPECTRE_V2_EIBRS_LFENCE] = "Mitigation: Enhanced IBRS + LFENCE",
- [SPECTRE_V2_EIBRS_RETPOLINE] = "Mitigation: Enhanced IBRS + Retpolines",
+ [SPECTRE_V2_EIBRS] = "Mitigation: Enhanced / Automatic IBRS",
+ [SPECTRE_V2_EIBRS_LFENCE] = "Mitigation: Enhanced / Automatic IBRS + LFENCE",
+ [SPECTRE_V2_EIBRS_RETPOLINE] = "Mitigation: Enhanced / Automatic IBRS + Retpolines",
[SPECTRE_V2_IBRS] = "Mitigation: IBRS",
[SPECTRE_V2_IBRS_ALWAYS] = "Mitigation: IBRS (kernel and user space)",
[SPECTRE_V2_RETPOLINE_IBRS_USER] = "Mitigation: Full retpoline and IBRS (user space)",
@@ -1253,7 +1253,7 @@ static enum spectre_v2_mitigation_cmd __init spectre_v2_parse_cmdline(void)
cmd == SPECTRE_V2_CMD_EIBRS_LFENCE ||
cmd == SPECTRE_V2_CMD_EIBRS_RETPOLINE) &&
!boot_cpu_has(X86_FEATURE_IBRS_ENHANCED)) {
- pr_err("%s selected but CPU doesn't have eIBRS. Switching to AUTO select\n",
+ pr_err("%s selected but CPU doesn't have Enhanced or Automatic IBRS. Switching to AUTO select\n",
mitigation_options[i].option);
return SPECTRE_V2_CMD_AUTO;
}
@@ -1446,8 +1446,12 @@ static void __init spectre_v2_select_mitigation(void)
pr_err(SPECTRE_V2_EIBRS_EBPF_MSG);
if (spectre_v2_in_ibrs_mode(mode)) {
- x86_spec_ctrl_base |= SPEC_CTRL_IBRS;
- update_spec_ctrl(x86_spec_ctrl_base);
+ if (boot_cpu_has(X86_FEATURE_AUTOIBRS)) {
+ msr_set_bit(MSR_EFER, _EFER_AUTOIBRS);
+ } else {
+ x86_spec_ctrl_base |= SPEC_CTRL_IBRS;
+ update_spec_ctrl(x86_spec_ctrl_base);
+ }
}
switch (mode) {
@@ -1542,8 +1546,8 @@ static void __init spectre_v2_select_mitigation(void)
/*
* Retpoline protects the kernel, but doesn't protect firmware. IBRS
* and Enhanced IBRS protect firmware too, so enable IBRS around
- * firmware calls only when IBRS / Enhanced IBRS aren't otherwise
- * enabled.
+ * firmware calls only when IBRS / Enhanced / Automatic IBRS aren't
+ * otherwise enabled.
*
* Use "mode" to check Enhanced IBRS instead of boot_cpu_has(), because
* the user might select retpoline on the kernel command line and if
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index a8dfd75588cd..c5c08a3ace2a 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1091,7 +1091,7 @@ static const __initconst struct x86_cpu_id_v2 cpu_vuln_whitelist[] = {
VULNWL_AMD(0x12, NO_MELTDOWN | NO_SSB | NO_L1TF | NO_MDS | NO_SWAPGS | NO_ITLB_MULTIHIT | NO_MMIO),
/* FAMILY_ANY must be last, otherwise 0x0f - 0x12 matches won't work */
- VULNWL_AMD(X86_FAMILY_ANY, NO_MELTDOWN | NO_L1TF | NO_MDS | NO_SWAPGS | NO_ITLB_MULTIHIT | NO_MMIO),
+ VULNWL_AMD(X86_FAMILY_ANY, NO_MELTDOWN | NO_L1TF | NO_MDS | NO_SWAPGS | NO_ITLB_MULTIHIT | NO_MMIO | NO_EIBRS_PBRSB),
{}
};
@@ -1196,8 +1196,16 @@ static void __init cpu_set_bug_bits(struct cpuinfo_x86 *c)
!cpu_has(c, X86_FEATURE_AMD_SSB_NO))
setup_force_cpu_bug(X86_BUG_SPEC_STORE_BYPASS);
- if (ia32_cap & ARCH_CAP_IBRS_ALL)
+ /*
+ * AMD's AutoIBRS is equivalent to Intel's eIBRS - use the Intel feature
+ * flag and protect from vendor-specific bugs via the whitelist.
+ */
+ if ((ia32_cap & ARCH_CAP_IBRS_ALL) || cpu_has(c, X86_FEATURE_AUTOIBRS)) {
setup_force_cpu_cap(X86_FEATURE_IBRS_ENHANCED);
+ if (!cpu_matches(cpu_vuln_whitelist, NO_EIBRS_PBRSB) &&
+ !(ia32_cap & ARCH_CAP_PBRSB_NO))
+ setup_force_cpu_bug(X86_BUG_EIBRS_PBRSB);
+ }
if (!cpu_matches(cpu_vuln_whitelist, NO_MDS) &&
!(ia32_cap & ARCH_CAP_MDS_NO)) {
@@ -1259,11 +1267,6 @@ static void __init cpu_set_bug_bits(struct cpuinfo_x86 *c)
setup_force_cpu_bug(X86_BUG_RETBLEED);
}
- if (cpu_has(c, X86_FEATURE_IBRS_ENHANCED) &&
- !cpu_matches(cpu_vuln_whitelist, NO_EIBRS_PBRSB) &&
- !(ia32_cap & ARCH_CAP_PBRSB_NO))
- setup_force_cpu_bug(X86_BUG_EIBRS_PBRSB);
-
if (cpu_matches(cpu_vuln_whitelist, NO_MELTDOWN))
return;
--
2.39.3

86
SOURCES/1048-x86-CPU-AMD-Make-sure-EFER-AIBRSE-is-set.patch Normal file
View File

@ -0,0 +1,86 @@
From 373fedf7ca5674e2ab511685e183e6e6c6e00d91 Mon Sep 17 00:00:00 2001
From: "Borislav Petkov (AMD)" <bp@alien8.de>
Date: Sat, 25 Feb 2023 01:11:31 +0100
Subject: [PATCH 34/36] x86/CPU/AMD: Make sure EFER[AIBRSE] is set
The AutoIBRS bit gets set only on the BSP as part of determining which
mitigation to enable on AMD. Setting on the APs relies on the
circumstance that the APs get booted through the trampoline and EFER
- the MSR which contains that bit - gets replicated on every AP from the
BSP.
However, this can change in the future and considering the security
implications of this bit not being set on every CPU, make sure it is set
by verifying EFER later in the boot process and on every AP.
Reported-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lore.kernel.org/r/20230224185257.o3mcmloei5zqu7wa@treble
(cherry picked from commit 8cc68c9c9e92dbaae51a711454c66eb668045508)
CVE: CVE-2023-20593
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/kernel/cpu/amd.c | 11 +++++++++++
arch/x86/kernel/cpu/bugs.c | 3 +--
arch/x86/kernel/cpu/cpu.h | 8 ++++++++
3 files changed, 20 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 2406a71a1eb6..c2979e3bed04 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -1046,6 +1046,17 @@ static void init_amd(struct cpuinfo_x86 *c)
msr_set_bit(MSR_K7_HWCR, MSR_K7_HWCR_IRPERF_EN_BIT);
check_null_seg_clears_base(c);
+
+ /*
+ * Make sure EFER[AIBRSE - Automatic IBRS Enable] is set. The APs are brought up
+ * using the trampoline code and as part of it, MSR_EFER gets prepared there in
+ * order to be replicated onto them. Regardless, set it here again, if not set,
+ * to protect against any future refactoring/code reorganization which might
+ * miss setting this important bit.
+ */
+ if (spectre_v2_in_eibrs_mode(spectre_v2_enabled) &&
+ cpu_has(c, X86_FEATURE_AUTOIBRS))
+ WARN_ON_ONCE(msr_set_bit(MSR_EFER, _EFER_AUTOIBRS));
}
#ifdef CONFIG_X86_32
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 43295a878b8f..d8c1bbea4e90 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -748,8 +748,7 @@ static int __init nospectre_v1_cmdline(char *str)
}
early_param("nospectre_v1", nospectre_v1_cmdline);
-static enum spectre_v2_mitigation spectre_v2_enabled __ro_after_init =
- SPECTRE_V2_NONE;
+enum spectre_v2_mitigation spectre_v2_enabled __ro_after_init = SPECTRE_V2_NONE;
#undef pr_fmt
#define pr_fmt(fmt) "RETBleed: " fmt
diff --git a/arch/x86/kernel/cpu/cpu.h b/arch/x86/kernel/cpu/cpu.h
index 1add3618f766..0af870727bfa 100644
--- a/arch/x86/kernel/cpu/cpu.h
+++ b/arch/x86/kernel/cpu/cpu.h
@@ -88,4 +88,12 @@ extern void update_srbds_msr(void);
void init_ia32_feat_ctl(struct cpuinfo_x86 *c);
#endif
+extern enum spectre_v2_mitigation spectre_v2_enabled;
+
+static inline bool spectre_v2_in_eibrs_mode(enum spectre_v2_mitigation mode)
+{
+ return mode == SPECTRE_V2_EIBRS ||
+ mode == SPECTRE_V2_EIBRS_RETPOLINE ||
+ mode == SPECTRE_V2_EIBRS_LFENCE;
+}
#endif /* ARCH_X86_CPU_H */
--
2.39.3

175
SOURCES/1049-x86-cpu-amd-Add-a-Zenbleed-fix.patch Normal file
View File

@ -0,0 +1,175 @@
From 661c6baa7f0dd4ef365c1cfd5aee9e999304fab2 Mon Sep 17 00:00:00 2001
From: "Borislav Petkov (AMD)" <bp@alien8.de>
Date: Sat, 15 Jul 2023 13:41:28 +0200
Subject: [PATCH 35/36] x86/cpu/amd: Add a Zenbleed fix
Add a fix for the Zen2 VZEROUPPER data corruption bug where under
certain circumstances executing VZEROUPPER can cause register
corruption or leak data.
The optimal fix is through microcode but in the case the proper
microcode revision has not been applied, enable a fallback fix using
a chicken bit.
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
(cherry picked from commit 522b1d69219d8f083173819fde04f994aa051a98)
CVE: CVE-2023-20593
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
---
arch/x86/include/asm/microcode.h | 1 +
arch/x86/include/asm/microcode_amd.h | 2 +
arch/x86/include/asm/msr-index.h | 2 +
arch/x86/kernel/cpu/amd.c | 60 ++++++++++++++++++++++++++++
arch/x86/kernel/cpu/common.c | 2 +
5 files changed, 67 insertions(+)
diff --git a/arch/x86/include/asm/microcode.h b/arch/x86/include/asm/microcode.h
index 629330986955..2e23f658c69b 100644
--- a/arch/x86/include/asm/microcode.h
+++ b/arch/x86/include/asm/microcode.h
@@ -5,6 +5,7 @@
#include <asm/cpu.h>
#include <linux/earlycpio.h>
#include <linux/initrd.h>
+#include <asm/microcode_amd.h>
struct ucode_patch {
struct list_head plist;
diff --git a/arch/x86/include/asm/microcode_amd.h b/arch/x86/include/asm/microcode_amd.h
index a645b25ee442..403a8e76b310 100644
--- a/arch/x86/include/asm/microcode_amd.h
+++ b/arch/x86/include/asm/microcode_amd.h
@@ -48,11 +48,13 @@ extern void __init load_ucode_amd_bsp(unsigned int family);
extern void load_ucode_amd_ap(unsigned int family);
extern int __init save_microcode_in_initrd_amd(unsigned int family);
void reload_ucode_amd(unsigned int cpu);
+extern void amd_check_microcode(void);
#else
static inline void __init load_ucode_amd_bsp(unsigned int family) {}
static inline void load_ucode_amd_ap(unsigned int family) {}
static inline int __init
save_microcode_in_initrd_amd(unsigned int family) { return -EINVAL; }
static inline void reload_ucode_amd(unsigned int cpu) {}
+static inline void amd_check_microcode(void) {}
#endif
#endif /* _ASM_X86_MICROCODE_AMD_H */
diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index bf54eb786776..bc38cbf0ac20 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -498,6 +498,8 @@
#define MSR_AMD_PPIN 0xc00102f1
#define MSR_AMD64_LS_CFG 0xc0011020
#define MSR_AMD64_DC_CFG 0xc0011022
+#define MSR_AMD64_DE_CFG_ZEN2_FP_BACKUP_FIX_BIT 9
+
#define MSR_AMD64_BU_CFG2 0xc001102a
#define MSR_AMD64_IBSFETCHCTL 0xc0011030
#define MSR_AMD64_IBSFETCHLINAD 0xc0011031
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index c2979e3bed04..384e484cbbdc 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -69,6 +69,11 @@ static const int amd_erratum_383[] =
static const int amd_erratum_1054[] =
AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x17, 0, 0, 0x2f, 0xf));
+static const int amd_zenbleed[] =
+ AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x17, 0x30, 0x0, 0x4f, 0xf),
+ AMD_MODEL_RANGE(0x17, 0x60, 0x0, 0x7f, 0xf),
+ AMD_MODEL_RANGE(0x17, 0xa0, 0x0, 0xaf, 0xf));
+
static bool cpu_has_amd_erratum(struct cpuinfo_x86 *cpu, const int *erratum)
{
int osvw_id = *erratum++;
@@ -957,6 +962,47 @@ static void init_amd_zn(struct cpuinfo_x86 *c)
}
}
+static bool cpu_has_zenbleed_microcode(void)
+{
+ u32 good_rev = 0;
+
+ switch (boot_cpu_data.x86_model) {
+ case 0x30 ... 0x3f: good_rev = 0x0830107a; break;
+ case 0x60 ... 0x67: good_rev = 0x0860010b; break;
+ case 0x68 ... 0x6f: good_rev = 0x08608105; break;
+ case 0x70 ... 0x7f: good_rev = 0x08701032; break;
+ case 0xa0 ... 0xaf: good_rev = 0x08a00008; break;
+
+ default:
+ return false;
+ break;
+ }
+
+ if (boot_cpu_data.microcode < good_rev)
+ return false;
+
+ return true;
+}
+
+static void zenbleed_check(struct cpuinfo_x86 *c)
+{
+ if (!cpu_has_amd_erratum(c, amd_zenbleed))
+ return;
+
+ if (cpu_has(c, X86_FEATURE_HYPERVISOR))
+ return;
+
+ if (!cpu_has(c, X86_FEATURE_AVX))
+ return;
+
+ if (!cpu_has_zenbleed_microcode()) {
+ pr_notice_once("Zenbleed: please update your microcode for the most optimal fix\n");
+ msr_set_bit(MSR_AMD64_DE_CFG, MSR_AMD64_DE_CFG_ZEN2_FP_BACKUP_FIX_BIT);
+ } else {
+ msr_clear_bit(MSR_AMD64_DE_CFG, MSR_AMD64_DE_CFG_ZEN2_FP_BACKUP_FIX_BIT);
+ }
+}
+
static void init_amd(struct cpuinfo_x86 *c)
{
early_init_amd(c);
@@ -1057,6 +1103,8 @@ static void init_amd(struct cpuinfo_x86 *c)
if (spectre_v2_in_eibrs_mode(spectre_v2_enabled) &&
cpu_has(c, X86_FEATURE_AUTOIBRS))
WARN_ON_ONCE(msr_set_bit(MSR_EFER, _EFER_AUTOIBRS));
+
+ zenbleed_check(c);
}
#ifdef CONFIG_X86_32
@@ -1205,3 +1253,15 @@ u32 amd_get_highest_perf(void)
return 255;
}
EXPORT_SYMBOL_GPL(amd_get_highest_perf);
+
+static void zenbleed_check_cpu(void *unused)
+{
+ struct cpuinfo_x86 *c = &cpu_data(smp_processor_id());
+
+ zenbleed_check(c);
+}
+
+void amd_check_microcode(void)
+{
+ on_each_cpu(zenbleed_check_cpu, NULL, 1);
+}
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index c5c08a3ace2a..61039cf3d6eb 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -2187,6 +2187,8 @@ void microcode_check(struct cpuinfo_x86 *prev_info)
perf_check_microcode();
+ amd_check_microcode();
+
store_cpu_caps(&curr_info);
if (!memcmp(&prev_info->x86_capability, &curr_info.x86_capability,
--
2.39.3

76
SOURCES/1050-netfilter-nf_tables-incorrect-error-path-handling-wi.patch Normal file
View File

@ -0,0 +1,76 @@
From 516c2ee4fa03f50738843aae224410f1c532ddd3 Mon Sep 17 00:00:00 2001
From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Thu, 8 Jun 2023 02:32:02 +0200
Subject: [PATCH 36/36] netfilter: nf_tables: incorrect error path handling with
NFT_MSG_NEWRULE
In case of error when adding a new rule that refers to an anonymous set,
deactivate expressions via NFT_TRANS_PREPARE state, not NFT_TRANS_RELEASE.
Thus, the lookup expression marks anonymous sets as inactive in the next
generation to ensure it is not reachable in this transaction anymore and
decrement the set refcount as introduced by c1592a89942e ("netfilter:
nf_tables: deactivate anonymous set from preparation phase"). The abort
step takes care of undoing the anonymous set.
This is also consistent with rule deletion, where NFT_TRANS_PREPARE is
used. Note that this error path is exercised in the preparation step of
the commit protocol. This patch replaces nf_tables_rule_release() by the
deactivate and destroy calls, this time with NFT_TRANS_PREPARE.
Due to this incorrect error handling, it is possible to access a
dangling pointer to the anonymous set that remains in the transaction
list.
[1009.379054] BUG: KASAN: use-after-free in nft_set_lookup_global+0x147/0x1a0 [nf_tables]
[1009.379106] Read of size 8 at addr ffff88816c4c8020 by task nft-rule-add/137110
[1009.379116] CPU: 7 PID: 137110 Comm: nft-rule-add Not tainted 6.4.0-rc4+ #256
[1009.379128] Call Trace:
[1009.379132] <TASK>
[1009.379135] dump_stack_lvl+0x33/0x50
[1009.379146] ? nft_set_lookup_global+0x147/0x1a0 [nf_tables]
[1009.379191] print_address_description.constprop.0+0x27/0x300
[1009.379201] kasan_report+0x107/0x120
[1009.379210] ? nft_set_lookup_global+0x147/0x1a0 [nf_tables]
[1009.379255] nft_set_lookup_global+0x147/0x1a0 [nf_tables]
[1009.379302] nft_lookup_init+0xa5/0x270 [nf_tables]
[1009.379350] nf_tables_newrule+0x698/0xe50 [nf_tables]
[1009.379397] ? nf_tables_rule_release+0xe0/0xe0 [nf_tables]
[1009.379441] ? kasan_unpoison+0x23/0x50
[1009.379450] nfnetlink_rcv_batch+0x97c/0xd90 [nfnetlink]
[1009.379470] ? nfnetlink_rcv_msg+0x480/0x480 [nfnetlink]
[1009.379485] ? __alloc_skb+0xb8/0x1e0
[1009.379493] ? __alloc_skb+0xb8/0x1e0
[1009.379502] ? entry_SYSCALL_64_after_hwframe+0x46/0xb0
[1009.379509] ? unwind_get_return_address+0x2a/0x40
[1009.379517] ? write_profile+0xc0/0xc0
[1009.379524] ? avc_lookup+0x8f/0xc0
[1009.379532] ? __rcu_read_unlock+0x43/0x60
Fixes: 958bee14d071 ("netfilter: nf_tables: use new transaction infrastructure to handle sets")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
(cherry picked from commit 1240eb93f0616b21c675416516ff3d74798fdc97)
CVE: CVE-2023-3390
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
Reviewed-by: Venkat Venkatsubra <venkat.x.venkatsubra@oracle.com>
---
net/netfilter/nf_tables_api.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index c7d98b011cd6..f9bf6e156051 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -3260,7 +3260,8 @@ err_destroy_flow_rule:
if (flow)
nft_flow_rule_destroy(flow);
err_release_rule:
- nf_tables_rule_release(&ctx, rule);
+ nft_rule_expr_deactivate(&ctx, rule, NFT_TRANS_PREPARE);
+ nf_tables_rule_destroy(&ctx, rule);
err_release_expr:
for (i = 0; i < n; i++) {
if (info[i].ops) {
--
2.39.3

113
SPECS/kernel.spec
View File

@ -38,11 +38,11 @@
# define buildid .local
%define rpmversion 4.18.0
%define pkgrelease 477.27.1.rt7.290.el8_8
%define pkgrelease 477.27.2.rt7.290.el8_8
%define tarfile_release 477.13.1.rt7.276.el8_8
# allow pkg_release to have configurable %%{?dist} tag
%define specrelease 477.27.1.rt7.290%{?dist}
%define specrelease 477.27.2.rt7.290%{?dist}
%define pkg_release %{specrelease}%{?buildid}
@ -538,6 +538,42 @@ Patch1011: 1011-net-sched-cls_fw-Fix-improper-refcount-update-leads-.patch
Patch1012: 1012-netfilter-nft_set_pipapo-fix-improper-element-remova.patch
Patch1013: 1013-netfilter-nf_tables-prevent-OOB-access-in-nft_byteor.patch
Patch1014: 1014-net-sched-flower-fix-possible-OOB-write-in-fl_set_ge.patch
Patch1015: 1015-x86-microcode-intel-Expose-collect_cpu_info_early-fo.patch
Patch1016: 1016-x86-cpu-Load-microcode-during-restore_processor_stat.patch
Patch1017: 1017-x86-microcode-Deprecate-MICROCODE_OLD_INTERFACE.patch
Patch1018: 1018-x86-microcode-Rip-out-the-OLD_INTERFACE.patch
Patch1019: 1019-x86-microcode-Default-disable-late-loading.patch
Patch1020: 1020-x86-microcode-Taint-and-warn-on-late-loading.patch
Patch1021: 1021-x86-microcode-Remove-unnecessary-perf-callback.patch
Patch1022: 1022-x86-microcode-Print-previous-version-of-microcode-af.patch
Patch1023: 1023-x86-microcode-Rip-out-the-subsys-interface-gunk.patch
Patch1024: 1024-x86-microcode-Simplify-init-path-even-more.patch
Patch1025: 1025-x86-microcode-AMD-Rename-a-couple-of-functions.patch
Patch1026: 1026-x86-microcode-Fix-return-value-for-microcode-late-lo.patch
Patch1027: 1027-x86-microcode-Add-a-parameter-to-microcode_check-to-.patch
Patch1028: 1028-x86-microcode-Check-CPU-capabilities-after-late-micr.patch
Patch1029: 1029-x86-microcode-Adjust-late-loading-result-reporting-m.patch
Patch1030: 1030-x86-amd-Cache-debug-register-values-in-percpu-variab.patch
Patch1031: 1031-x86-microcode-Remove-request_microcode_user.patch
Patch1032: 1032-x86-microcode-Kill-refresh_fw.patch
Patch1033: 1033-x86-microcode-amd-Remove-load_microcode_amd-s-bsp-pa.patch
Patch1034: 1034-x86-microcode-Drop-struct-ucode_cpu_info.valid.patch
Patch1035: 1035-x86-microcode-AMD-Add-a-cpu-parameter-to-the-reloadi.patch
Patch1036: 1036-x86-microcode-AMD-Track-patch-allocation-size-explic.patch
Patch1037: 1037-x86-microcode-AMD-Fix-mixed-steppings-support.patch
Patch1038: 1038-x86-microcode-core-Return-an-error-only-when-necessa.patch
Patch1039: 1039-x86-apic-Don-t-disable-x2APIC-if-locked.patch
Patch1040: 1040-x86-cpu-amd-Move-the-errata-checking-functionality-u.patch
Patch1041: 1041-x86-cpu-Remove-redundant-extern-x86_read_arch_cap_ms.patch
Patch1042: 1042-x86-cpu-kvm-Add-support-for-CPUID_80000021_EAX.patch
Patch1043: 1043-KVM-x86-Advertise-that-the-SMM_CTL-MSR-is-not-suppor.patch
Patch1044: 1044-KVM-x86-Move-open-coded-CPUID-leaf-0x80000021-EAX-bi.patch
Patch1045: 1045-x86-cpu-kvm-Add-the-NO_NESTED_DATA_BP-feature.patch
Patch1046: 1046-x86-bugs-Make-sure-MSR_SPEC_CTRL-is-updated-properly.patch
Patch1047: 1047-x86-cpu-Support-AMD-Automatic-IBRS.patch
Patch1048: 1048-x86-CPU-AMD-Make-sure-EFER-AIBRSE-is-set.patch
Patch1049: 1049-x86-cpu-amd-Add-a-Zenbleed-fix.patch
Patch1050: 1050-netfilter-nf_tables-incorrect-error-path-handling-wi.patch
Patch9001: 9001-x86-xen-Split-HVM-vector-callback-setup-and-interrup.patch
Patch9002: 9002-x86-microcode-AMD-Load-late-on-both-threads-too.patch
@ -1119,6 +1155,42 @@ ApplyPatch 1011-net-sched-cls_fw-Fix-improper-refcount-update-leads-.patch
ApplyPatch 1012-netfilter-nft_set_pipapo-fix-improper-element-remova.patch
ApplyPatch 1013-netfilter-nf_tables-prevent-OOB-access-in-nft_byteor.patch
ApplyPatch 1014-net-sched-flower-fix-possible-OOB-write-in-fl_set_ge.patch
ApplyPatch 1015-x86-microcode-intel-Expose-collect_cpu_info_early-fo.patch
ApplyPatch 1016-x86-cpu-Load-microcode-during-restore_processor_stat.patch
ApplyPatch 1017-x86-microcode-Deprecate-MICROCODE_OLD_INTERFACE.patch
ApplyPatch 1018-x86-microcode-Rip-out-the-OLD_INTERFACE.patch
ApplyPatch 1019-x86-microcode-Default-disable-late-loading.patch
ApplyPatch 1020-x86-microcode-Taint-and-warn-on-late-loading.patch
ApplyPatch 1021-x86-microcode-Remove-unnecessary-perf-callback.patch
ApplyPatch 1022-x86-microcode-Print-previous-version-of-microcode-af.patch
ApplyPatch 1023-x86-microcode-Rip-out-the-subsys-interface-gunk.patch
ApplyPatch 1024-x86-microcode-Simplify-init-path-even-more.patch
ApplyPatch 1025-x86-microcode-AMD-Rename-a-couple-of-functions.patch
ApplyPatch 1026-x86-microcode-Fix-return-value-for-microcode-late-lo.patch
ApplyPatch 1027-x86-microcode-Add-a-parameter-to-microcode_check-to-.patch
ApplyPatch 1028-x86-microcode-Check-CPU-capabilities-after-late-micr.patch
ApplyPatch 1029-x86-microcode-Adjust-late-loading-result-reporting-m.patch
ApplyPatch 1030-x86-amd-Cache-debug-register-values-in-percpu-variab.patch
ApplyPatch 1031-x86-microcode-Remove-request_microcode_user.patch
ApplyPatch 1032-x86-microcode-Kill-refresh_fw.patch
ApplyPatch 1033-x86-microcode-amd-Remove-load_microcode_amd-s-bsp-pa.patch
ApplyPatch 1034-x86-microcode-Drop-struct-ucode_cpu_info.valid.patch
ApplyPatch 1035-x86-microcode-AMD-Add-a-cpu-parameter-to-the-reloadi.patch
ApplyPatch 1036-x86-microcode-AMD-Track-patch-allocation-size-explic.patch
ApplyPatch 1037-x86-microcode-AMD-Fix-mixed-steppings-support.patch
ApplyPatch 1038-x86-microcode-core-Return-an-error-only-when-necessa.patch
ApplyPatch 1039-x86-apic-Don-t-disable-x2APIC-if-locked.patch
ApplyPatch 1040-x86-cpu-amd-Move-the-errata-checking-functionality-u.patch
ApplyPatch 1041-x86-cpu-Remove-redundant-extern-x86_read_arch_cap_ms.patch
ApplyPatch 1042-x86-cpu-kvm-Add-support-for-CPUID_80000021_EAX.patch
ApplyPatch 1043-KVM-x86-Advertise-that-the-SMM_CTL-MSR-is-not-suppor.patch
ApplyPatch 1044-KVM-x86-Move-open-coded-CPUID-leaf-0x80000021-EAX-bi.patch
ApplyPatch 1045-x86-cpu-kvm-Add-the-NO_NESTED_DATA_BP-feature.patch
ApplyPatch 1046-x86-bugs-Make-sure-MSR_SPEC_CTRL-is-updated-properly.patch
ApplyPatch 1047-x86-cpu-Support-AMD-Automatic-IBRS.patch
ApplyPatch 1048-x86-CPU-AMD-Make-sure-EFER-AIBRSE-is-set.patch
ApplyPatch 1049-x86-cpu-amd-Add-a-Zenbleed-fix.patch
ApplyPatch 1050-netfilter-nf_tables-incorrect-error-path-handling-wi.patch
ApplyPatch 9001-x86-xen-Split-HVM-vector-callback-setup-and-interrup.patch
ApplyPatch 9002-x86-microcode-AMD-Load-late-on-both-threads-too.patch
@ -2731,6 +2803,43 @@ fi
#
#
%changelog
* Thu Sep 29 2023 Andrew Lukoshko <alukoshko@almalinux.org> [4.18.0-477.27.2.rt7.290.el8_8]
- x86/microcode/intel: Expose collect_cpu_info_early() for IFS
- x86/cpu: Load microcode during restore_processor_state()
- x86/microcode: Deprecate MICROCODE_OLD_INTERFACE
- x86/microcode: Rip out the OLD_INTERFACE
- x86/microcode: Default-disable late loading
- x86/microcode: Taint and warn on late loading
- x86/microcode: Remove unnecessary perf callback
- x86/microcode: Print previous version of microcode after reload
- x86/microcode: Rip out the subsys interface gunk
- x86/microcode: Simplify init path even more
- x86/microcode/AMD: Rename a couple of functions {CVE-2023-20593}
- x86/microcode: Add a parameter to microcode_check() to store CPU capabilities {CVE-2023-20593}
- x86/microcode: Check CPU capabilities after late microcode update correctly {CVE-2023-20593}
- x86/microcode: Adjust late loading result reporting message {CVE-2023-20593}
- x86/amd: Cache debug register values in percpu variables {CVE-2023-20593}
- x86/microcode: Remove ->request_microcode_user()
- x86/microcode: Kill refresh_fw
- x86/microcode/amd: Remove load_microcode_amd()'s bsp parameter {CVE-2023-20593}
- x86/microcode: Drop struct ucode_cpu_info.valid
- x86/microcode/AMD: Add a @cpu parameter to the reloading functions {CVE-2023-20593}
- x86/microcode/AMD: Track patch allocation size explicitly
- x86/microcode/AMD: Fix mixed steppings support {CVE-2023-20593}
- x86/microcode/core: Return an error only when necessary {CVE-2023-20593}
- x86/apic: Don't disable x2APIC if locked
- x86/cpu/amd: Move the errata checking functionality up {CVE-2023-20593}
- x86/cpu: Remove redundant extern x86_read_arch_cap_msr()
- x86/cpu, kvm: Add support for CPUID_80000021_EAX
- KVM: x86: Advertise that the SMM_CTL MSR is not supported
- KVM: x86: Move open-coded CPUID leaf 0x80000021 EAX bit propagation code
- x86/cpu, kvm: Add the NO_NESTED_DATA_BP feature
- x86/bugs: Make sure MSR_SPEC_CTRL is updated properly upon resume from S3
- x86/cpu: Support AMD Automatic IBRS
- x86/CPU/AMD: Make sure EFER[AIBRSE] is set
- x86/cpu/amd: Add a Zenbleed fix {CVE-2023-20593}
- netfilter: nf_tables: incorrect error path handling with NFT_MSG_NEWRULE {CVE-2023-3390}
* Thu Sep 21 2023 Andrew Lukoshko <alukoshko@almalinux.org> [4.18.0-477.27.1.rt7.290.el8_8]
- bluetooth: Perform careful capability checks in hci_sock_ioctl() {CVE-2023-2002}
- ipvlan:Fix out-of-bounds caused by unclear skb->cb {CVE-2023-3090}