Rebase the lockdown sysrq patch to work with upstream
Upstream finally merged the lockdown patches, adjust the SysRq patch to work with the upstreamed version. Signed-off-by: Jeremy Cline <jcline@redhat.com>
This commit is contained in:
Jeremy Cline
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5df4c5562f
14
kernel.spec
14
kernel.spec
@ -499,16 +499,16 @@ Patch122: Input-synaptics-pin-3-touches-when-the-firmware-repo.patch
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# 200 - x86 / secureboot
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# Patch201: efi-lockdown.patch
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# bz 1497559 - Make kernel MODSIGN code not error on missing variables
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Patch207: 0001-Make-get_cert_list-not-complain-about-cert-lists-tha.patch
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Patch208: 0002-Add-efi_status_to_str-and-rework-efi_status_to_err.patch
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Patch209: 0003-Make-get_cert_list-use-efi_status_to_str-to-print-er.patch
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Patch200: 0001-Make-get_cert_list-not-complain-about-cert-lists-tha.patch
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Patch201: 0002-Add-efi_status_to_str-and-rework-efi_status_to_err.patch
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Patch202: 0003-Make-get_cert_list-use-efi_status_to_str-to-print-er.patch
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Patch210: disable-i8042-check-on-apple-mac.patch
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Patch203: disable-i8042-check-on-apple-mac.patch
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Patch212: efi-secureboot.patch
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Patch204: efi-secureboot.patch
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Patch205: lift-lockdown-sysrq.patch
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# 300 - ARM patches
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Patch300: arm64-Add-option-of-13-for-FORCE_MAX_ZONEORDER.patch
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@ -1,7 +1,7 @@
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From 4a84d19a10c31a363aa7d1f325bd212012263a98 Mon Sep 17 00:00:00 2001
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From c2eb371cede78df9a47bf3a125aa9a45dd833da7 Mon Sep 17 00:00:00 2001
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From: Kyle McMartin <kyle@redhat.com>
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Date: Mon, 9 Apr 2018 09:52:45 +0100
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Subject: [PATCH 28/29] Add a SysRq option to lift kernel lockdown
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Subject: [PATCH] Add a SysRq option to lift kernel lockdown
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Make an option to provide a sysrq key that will lift the kernel lockdown,
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thereby allowing the running kernel image to be accessed and modified.
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@ -14,16 +14,17 @@ for that arch, the Kconfig option is restricted to arches that support it.
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Signed-off-by: Kyle McMartin <kyle@redhat.com>
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Signed-off-by: David Howells <dhowells@redhat.com>
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cc: x86@kernel.org
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Signed-off-by: Jeremy Cline <jcline@redhat.com>
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---
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arch/x86/include/asm/setup.h | 2 ++
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drivers/input/misc/uinput.c | 1 +
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drivers/tty/sysrq.c | 19 ++++++++++-----
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include/linux/input.h | 5 ++++
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include/linux/sysrq.h | 8 +++++-
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drivers/tty/sysrq.c | 27 +++++++++++++---------
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include/linux/input.h | 5 +++++
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include/linux/sysrq.h | 8 ++++++-
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kernel/debug/kdb/kdb_main.c | 2 +-
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security/Kconfig | 10 ++++++++
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security/lock_down.c | 47 ++++++++++++++++++++++++++++++++++++
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8 files changed, 86 insertions(+), 8 deletions(-)
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security/lockdown/Kconfig | 11 +++++++++
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security/lockdown/lockdown.c | 43 ++++++++++++++++++++++++++++++++++++
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8 files changed, 87 insertions(+), 12 deletions(-)
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diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h
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index ed8ec011a9fd..8daf633a5347 100644
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@ -51,7 +52,7 @@ index 84051f20b18a..583ab2bc1916 100644
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input_set_drvdata(udev->dev, udev);
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diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
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index 573b2055173c..7cc95a8bdf8d 100644
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index 573b2055173c..99082faafc44 100644
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--- a/drivers/tty/sysrq.c
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+++ b/drivers/tty/sysrq.c
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@@ -480,6 +480,7 @@ static struct sysrq_key_op *sysrq_key_table[36] = {
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@ -75,16 +76,20 @@ index 573b2055173c..7cc95a8bdf8d 100644
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op_p = __sysrq_get_key_op(key);
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if (op_p) {
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- /*
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- * Should we check for enabled operations (/proc/sysrq-trigger
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- * should not) and is the invoked operation enabled?
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- */
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- if (!check_mask || sysrq_on_mask(op_p->enable_mask)) {
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+ /* Ban synthetic events from some sysrq functionality */
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+ if ((from == SYSRQ_FROM_PROC || from == SYSRQ_FROM_SYNTHETIC) &&
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+ op_p->enable_mask & SYSRQ_DISABLE_USERSPACE)
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+ op_p->enable_mask & SYSRQ_DISABLE_USERSPACE) {
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+ printk("This sysrq operation is disabled from userspace.\n");
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/*
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* Should we check for enabled operations (/proc/sysrq-trigger
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* should not) and is the invoked operation enabled?
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*/
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- if (!check_mask || sysrq_on_mask(op_p->enable_mask)) {
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+ if (from == SYSRQ_FROM_KERNEL || sysrq_on_mask(op_p->enable_mask)) {
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+ } else if (from == SYSRQ_FROM_KERNEL || sysrq_on_mask(op_p->enable_mask)) {
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+ /*
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+ * Should we check for enabled operations (/proc/sysrq-trigger
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+ * should not) and is the invoked operation enabled?
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+ */
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pr_info("%s\n", op_p->action_msg);
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console_loglevel = orig_log_level;
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op_p->handler(key);
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@ -128,10 +133,10 @@ index 573b2055173c..7cc95a8bdf8d 100644
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return count;
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diff --git a/include/linux/input.h b/include/linux/input.h
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index 510e78558c10..7e7065b2f58a 100644
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index 94f277cd806a..8539afa2c001 100644
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--- a/include/linux/input.h
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+++ b/include/linux/input.h
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@@ -39,6 +39,7 @@ struct input_value {
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@@ -48,6 +48,7 @@ enum input_clock_type {
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* @phys: physical path to the device in the system hierarchy
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* @uniq: unique identification code for the device (if device has it)
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* @id: id of the device (struct input_id)
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@ -139,7 +144,7 @@ index 510e78558c10..7e7065b2f58a 100644
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* @propbit: bitmap of device properties and quirks
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* @evbit: bitmap of types of events supported by the device (EV_KEY,
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* EV_REL, etc.)
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@@ -121,6 +122,8 @@ struct input_dev {
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@@ -134,6 +135,8 @@ struct input_dev {
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const char *uniq;
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struct input_id id;
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@ -148,7 +153,7 @@ index 510e78558c10..7e7065b2f58a 100644
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unsigned long propbit[BITS_TO_LONGS(INPUT_PROP_CNT)];
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unsigned long evbit[BITS_TO_LONGS(EV_CNT)];
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@@ -187,6 +190,8 @@ struct input_dev {
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@@ -204,6 +207,8 @@ struct input_dev {
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};
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#define to_input_dev(d) container_of(d, struct input_dev, dev)
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@ -185,7 +190,7 @@ index 8c71874e8485..7de1f08b60a9 100644
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int unregister_sysrq_key(int key, struct sysrq_key_op *op);
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struct sysrq_key_op *__sysrq_get_key_op(int key);
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diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
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index 9ecfa37c7fbf..902b7785d7dc 100644
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index 4567fe998c30..d05142ef44c4 100644
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--- a/kernel/debug/kdb/kdb_main.c
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+++ b/kernel/debug/kdb/kdb_main.c
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@@ -1981,7 +1981,7 @@ static int kdb_sr(int argc, const char **argv)
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@ -197,51 +202,42 @@ index 9ecfa37c7fbf..902b7785d7dc 100644
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kdb_trap_printk--;
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return 0;
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diff --git a/security/Kconfig b/security/Kconfig
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index 720cf9dee2b4..fe08b674bfce 100644
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--- a/security/Kconfig
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+++ b/security/Kconfig
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@@ -245,6 +245,16 @@ config LOCK_DOWN_KERNEL_FORCE
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help
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Enable the kernel lock down functionality automatically at boot.
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diff --git a/security/lockdown/Kconfig b/security/lockdown/Kconfig
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index e84ddf484010..20e979178e1c 100644
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--- a/security/lockdown/Kconfig
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+++ b/security/lockdown/Kconfig
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@@ -45,3 +45,14 @@ config LOCK_DOWN_KERNEL_FORCE_CONFIDENTIALITY
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disabled.
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+config ALLOW_LOCKDOWN_LIFT_BY_SYSRQ
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+ bool "Allow the kernel lockdown to be lifted by SysRq"
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+ depends on LOCK_DOWN_KERNEL
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+ depends on !LOCK_DOWN_KERNEL_FORCE
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+ depends on MAGIC_SYSRQ
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+ depends on X86
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+ help
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+ Allow the lockdown on a kernel to be lifted, by pressing a SysRq key
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+ combination on a wired keyboard. On x86, this is SysRq+x.
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endchoice
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+
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source "security/selinux/Kconfig"
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source "security/smack/Kconfig"
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source "security/tomoyo/Kconfig"
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diff --git a/security/lock_down.c b/security/lock_down.c
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index ee00ca2677e7..d68dff872ced 100644
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--- a/security/lock_down.c
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+++ b/security/lock_down.c
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@@ -12,8 +12,14 @@
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+config ALLOW_LOCKDOWN_LIFT_BY_SYSRQ
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+ bool "Allow the kernel lockdown to be lifted by SysRq"
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+ depends on SECURITY_LOCKDOWN_LSM
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+ depends on !LOCK_DOWN_KERNEL_FORCE_CONFIDENTIALITY
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+ depends on !LOCK_DOWN_KERNEL_FORCE_INTEGRITY
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+ depends on MAGIC_SYSRQ
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+ depends on X86
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+ help
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+ Allow setting the lockdown mode to "none" by pressing a SysRq key
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+ combination on a wired keyboard. On x86, this is SysRq+x
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diff --git a/security/lockdown/lockdown.c b/security/lockdown/lockdown.c
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index 8a10b43daf74..df4662257309 100644
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--- a/security/lockdown/lockdown.c
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+++ b/security/lockdown/lockdown.c
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@@ -13,6 +13,8 @@
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#include <linux/security.h>
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#include <linux/export.h>
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#include <linux/lsm_hooks.h>
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+#include <linux/sysrq.h>
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+#include <asm/setup.h>
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+#ifdef CONFIG_ALLOW_LOCKDOWN_LIFT_BY_SYSRQ
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+static __read_mostly bool kernel_locked_down;
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+#else
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static __ro_after_init bool kernel_locked_down;
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+#endif
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static enum lockdown_reason kernel_locked_down;
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/*
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* Put the kernel into lock-down mode.
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@@ -58,3 +64,44 @@ bool __kernel_is_locked_down(const char *what, bool first)
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return kernel_locked_down;
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@@ -179,6 +181,47 @@ static int __init lockdown_secfs_init(void)
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return PTR_ERR_OR_ZERO(dentry);
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}
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EXPORT_SYMBOL(__kernel_is_locked_down);
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+
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+#ifdef CONFIG_ALLOW_LOCKDOWN_LIFT_BY_SYSRQ
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+
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+/*
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@ -250,7 +246,7 @@ index ee00ca2677e7..d68dff872ced 100644
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+static void lift_kernel_lockdown(void)
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+{
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+ pr_notice("Lifting lockdown\n");
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+ kernel_locked_down = false;
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+ kernel_locked_down = LOCKDOWN_NONE;
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+}
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+
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+/*
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@ -282,5 +278,10 @@ index ee00ca2677e7..d68dff872ced 100644
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+late_initcall(lockdown_lift_sysrq);
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+
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+#endif /* CONFIG_ALLOW_LOCKDOWN_LIFT_BY_SYSRQ */
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+
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core_initcall(lockdown_secfs_init);
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#ifdef CONFIG_SECURITY_LOCKDOWN_LSM_EARLY
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--
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2.21.0
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