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- 0029-Fix-invalid-structure-size-error-during-crash-startu.patch

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- 0030-arm64-Fix-again-segfault.patch
- 0031-diskdump-netdump-fix-segmentation-fault.patch
This commit is contained in:
eabdullin 2023-08-09 10:50:58 +03:00
parent 0b62bb872f
commit eaaeaa62a3
4 changed files with 266 additions and 1 deletions
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47
SOURCES/0029-Fix-invalid-structure-size-error-during-crash-startu.patch Normal file
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@ -0,0 +1,47 @@
From ec1e61b33a705b8be8d116a541c7b076b0429deb Mon Sep 17 00:00:00 2001
From: Lianbo Jiang <lijiang@redhat.com>
Date: Mon, 12 Jun 2023 18:50:05 +0800
Subject: [PATCH 3/5] Fix invalid structure size error during crash startup on
ppc64
The crash utility will fail to start session on ppc64 with the following
error:
# crash vmlinux vmcore -s
crash: invalid structure size: note_buf
FILE: diskdump.c LINE: 121 FUNCTION: have_crash_notes()
[./crash] error trace: 101859ac => 10291798 => 10291450 => 10266038
10266038: SIZE_verify+156
10291450: have_crash_notes+308
10291798: map_cpus_to_prstatus_kdump_cmprs+448
101859ac: task_init+11980
The reason is that the size of note_buf is not initialized before using
SIZE(note_buf) in the have_crash_notes() on some architectures including
ppc64. Let's initialize it in task_init() to fix this issue.
Fixes: db8c030857b4 ("diskdump/netdump: fix segmentation fault caused by failure of stopping CPUs")
Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
---
task.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/task.c b/task.c
index 88941c7b0e4d..2b7467b4193d 100644
--- a/task.c
+++ b/task.c
@@ -675,6 +675,9 @@ task_init(void)
tt->this_task = pid_to_task(active_pid);
}
else {
+ if (INVALID_SIZE(note_buf))
+ STRUCT_SIZE_INIT(note_buf, "note_buf_t");
+
if (KDUMP_DUMPFILE())
map_cpus_to_prstatus();
else if (ELF_NOTES_VALID() && DISKDUMP_DUMPFILE())
--
2.37.1

41
SOURCES/0030-arm64-Fix-again-segfault.patch Normal file
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@ -0,0 +1,41 @@
From 6c8cd9b5dcf48221e5f75fc5850bb4719d77acce Mon Sep 17 00:00:00 2001
From: HATAYAMA Daisuke <d.hatayama@fujitsu.com>
Date: Wed, 7 Jun 2023 18:37:34 +0900
Subject: [PATCH] arm64: Fix again segfault in
arm64_is_kernel_exception_frame() when corrupt stack pointer address is given
This is the second trial from the commit
9868ebc8e648e5791764a51567a23efae7170d9b that was reverted at the
previous commit.
As described in the previous commit, result of STACK_OFFSET_TYPE() can
be an address out of bt->stackbuf and hence the address needs to be
checked prior to being referred to as an pt_regs object.
So, to fix the issue, let's check if stkptr points to within the range
of the kernel stack first.
[ kh: added a warning at Lianbo's suggestion ]
Signed-off-by: HATAYAMA Daisuke <d.hatayama@fujitsu.com>
---
arm64.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arm64.c b/arm64.c
index efbdccbe..67b1a224 100644
--- a/arm64.c
+++ b/arm64.c
@@ -2381,6 +2381,12 @@ arm64_is_kernel_exception_frame(struct bt_info *bt, ulong stkptr)
struct arm64_pt_regs *regs;
struct machine_specific *ms = machdep->machspec;
+ if (stkptr > STACKSIZE() && !INSTACK(stkptr, bt)) {
+ if (CRASHDEBUG(1))
+ error(WARNING, "stkptr: %lx is outside the kernel stack range\n", stkptr);
+ return FALSE;
+ }
+
regs = (struct arm64_pt_regs *)&bt->stackbuf[(ulong)(STACK_OFFSET_TYPE(stkptr))];
if (INSTACK(regs->sp, bt) && INSTACK(regs->regs[29], bt) &&

161
SOURCES/0031-diskdump-netdump-fix-segmentation-fault.patch Normal file
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@ -0,0 +1,161 @@
From db8c030857b4e318728c51c20da687906c109d0d Mon Sep 17 00:00:00 2001
From: HATAYAMA Daisuke <d.hatayama@fujitsu.com>
Date: Tue, 30 May 2023 19:38:34 +0900
Subject: [PATCH] diskdump/netdump: fix segmentation fault caused by failure of
stopping CPUs
There's no NMI on ARM. Hence, stopping the non-panicking CPUs from the
panicking CPU via IPI can fail easily if interrupts are being masked
in those moment. Moreover, crash_notes are not initialized for such
unstopped CPUs and the corresponding NT_PRSTATUS notes are not
attached to vmcore. However, crash utility never takes it
consideration such uninitialized crash_notes and then ends with
mapping different NT_PRSTATUS to actually unstopped CPUs. This corrupt
mapping can result crash utility into segmentation fault in the
operations where register values in NT_PRSTATUS notes are used.
For example:
crash> bt 1408
PID: 1408 TASK: ffff000003e22200 CPU: 2 COMMAND: "repro"
Segmentation fault (core dumped)
crash> help -D
diskdump_data:
filename: 127.0.0.1-2023-05-26-02:21:27/vmcore-ld1
flags: 46 (KDUMP_CMPRS_LOCAL|ERROR_EXCLUDED|LZO_SUPPORTED)
...snip...
notes_buf: 1815df0
num_vmcoredd_notes: 0
num_prstatus_notes: 5
notes[0]: 1815df0 (NT_PRSTATUS)
si.signo: 0 si.code: 0 si.errno: 0
...snip...
PSTATE: 80400005 FPVALID: 00000000
notes[4]: 1808f10 (NT_PRSTATUS)
Segmentation fault (core dumped)
To fix this issue, let's map NT_PRSTATUS to some CPU only if the
corresponding crash_notes is checked to be initialized.
[ kh: moved existence check for crash_notes out of the loop ]
Signed-off-by: HATAYAMA Daisuke <d.hatayama@fujitsu.com>
Signed-off-by: Kazuhito Hagio <k-hagio-ab@nec.com>
---
defs.h | 1 +
diskdump.c | 45 ++++++++++++++++++++++++++++++++++++++++++++-
netdump.c | 7 ++++++-
3 files changed, 51 insertions(+), 2 deletions(-)
diff --git a/defs.h b/defs.h
index 7d8bb8ab..6520d2f1 100644
--- a/defs.h
+++ b/defs.h
@@ -7118,6 +7118,7 @@ int dumpfile_is_split(void);
void show_split_dumpfiles(void);
void x86_process_elf_notes(void *, unsigned long);
void *diskdump_get_prstatus_percpu(int);
+int have_crash_notes(int cpu);
void map_cpus_to_prstatus_kdump_cmprs(void);
void diskdump_display_regs(int, FILE *);
void process_elf32_notes(void *, ulong);
diff --git a/diskdump.c b/diskdump.c
index 94bca4de..2c284ff3 100644
--- a/diskdump.c
+++ b/diskdump.c
@@ -101,12 +101,54 @@ int dumpfile_is_split(void)
return KDUMP_SPLIT();
}
+int have_crash_notes(int cpu)
+{
+ ulong crash_notes, notes_ptr;
+ char *buf, *p;
+ Elf64_Nhdr *note = NULL;
+
+ if (!readmem(symbol_value("crash_notes"), KVADDR, &crash_notes,
+ sizeof(crash_notes), "crash_notes", RETURN_ON_ERROR)) {
+ error(WARNING, "cannot read \"crash_notes\"\n");
+ return FALSE;
+ }
+
+ if ((kt->flags & SMP) && (kt->flags & PER_CPU_OFF))
+ notes_ptr = crash_notes + kt->__per_cpu_offset[cpu];
+ else
+ notes_ptr = crash_notes;
+
+ buf = GETBUF(SIZE(note_buf));
+
+ if (!readmem(notes_ptr, KVADDR, buf,
+ SIZE(note_buf), "note_buf_t", RETURN_ON_ERROR)) {
+ error(WARNING, "cpu %d: cannot read NT_PRSTATUS note\n", cpu);
+ return FALSE;
+ }
+
+ note = (Elf64_Nhdr *)buf;
+ p = buf + sizeof(Elf64_Nhdr);
+
+ if (note->n_type != NT_PRSTATUS) {
+ error(WARNING, "cpu %d: invalid NT_PRSTATUS note (n_type != NT_PRSTATUS)\n", cpu);
+ return FALSE;
+ }
+
+ if (!STRNEQ(p, "CORE")) {
+ error(WARNING, "cpu %d: invalid NT_PRSTATUS note (name != \"CORE\")\n", cpu);
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
void
map_cpus_to_prstatus_kdump_cmprs(void)
{
void **nt_ptr;
int online, i, j, nrcpus;
size_t size;
+ int crash_notes_exists;
if (pc->flags2 & QEMU_MEM_DUMP_COMPRESSED) /* notes exist for all cpus */
goto resize_note_pointers;
@@ -129,9 +171,10 @@ map_cpus_to_prstatus_kdump_cmprs(void)
* Re-populate the array with the notes mapping to online cpus
*/
nrcpus = (kt->kernel_NR_CPUS ? kt->kernel_NR_CPUS : NR_CPUS);
+ crash_notes_exists = kernel_symbol_exists("crash_notes");
for (i = 0, j = 0; i < nrcpus; i++) {
- if (in_cpu_map(ONLINE_MAP, i)) {
+ if (in_cpu_map(ONLINE_MAP, i) && (!crash_notes_exists || have_crash_notes(i))) {
dd->nt_prstatus_percpu[i] = nt_ptr[j++];
dd->num_prstatus_notes =
MAX(dd->num_prstatus_notes, i+1);
diff --git a/netdump.c b/netdump.c
index 4eba66ce..61ddeaa0 100644
--- a/netdump.c
+++ b/netdump.c
@@ -75,6 +75,7 @@ map_cpus_to_prstatus(void)
void **nt_ptr;
int online, i, j, nrcpus;
size_t size;
+ int crash_notes_exists;
if (pc->flags2 & QEMU_MEM_DUMP_ELF) /* notes exist for all cpus */
return;
@@ -97,10 +98,14 @@ map_cpus_to_prstatus(void)
* Re-populate the array with the notes mapping to online cpus
*/
nrcpus = (kt->kernel_NR_CPUS ? kt->kernel_NR_CPUS : NR_CPUS);
+ crash_notes_exists = kernel_symbol_exists("crash_notes");
for (i = 0, j = 0; i < nrcpus; i++) {
- if (in_cpu_map(ONLINE_MAP, i))
+ if (in_cpu_map(ONLINE_MAP, i) && (!crash_notes_exists || have_crash_notes(i))) {
nd->nt_prstatus_percpu[i] = nt_ptr[j++];
+ nd->num_prstatus_notes =
+ MAX(nd->num_prstatus_notes, i+1);
+ }
}
FREEBUF(nt_ptr);

18
SPECS/crash.spec
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@ -4,7 +4,7 @@
Summary: Kernel analysis utility for live systems, netdump, diskdump, kdump, LKCD or mcore dumpfiles
Name: crash
Version: 7.3.2
Release: 4%{?dist}.alma
Release: 4%{?dist}.1.alma
License: GPLv3
Group: Development/Debuggers
Source0: https://github.com/crash-utility/crash/archive/crash-%{version}.tar.gz
@ -64,6 +64,14 @@ Patch44: 0026-ppc64-still-allow-to-move-on-if-the-emergency-stacks.patch
Patch45: 0027-Fix-segmentation-fault-in-page_flags_init_from_pagef.patch
Patch46: 0028-Fix-for-ps-vm-commands-to-display-correct-MEM-and-RS.patch
# Patches were taken from:
# https://gitlab.com/redhat/centos-stream/rpms/crash/-/blob/d5edf45d2deeb8a47b29d23b95b286c6b1a16ee4/0003-Fix-invalid-structure-size-error-during-crash-startu.patch
Patch47: 0029-Fix-invalid-structure-size-error-during-crash-startu.patch
# https://github.com/crash-utility/crash/commit/6c8cd9b5dcf48221e5f75fc5850bb4719d77acce.patch
Patch48: 0030-arm64-Fix-again-segfault.patch
# https://github.com/crash-utility/crash/commit/db8c030857b4e318728c51c20da687906c109d0d.patch
Patch49: 0031-diskdump-netdump-fix-segmentation-fault.patch
%description
The core analysis suite is a self-contained tool that can be used to
investigate either live systems, kernel core dumps created from the
@ -130,6 +138,9 @@ offered by Mission Critical Linux, or the LKCD kernel patch.
%patch44 -p1
%patch45 -p1
%patch46 -p1
%patch47 -p1
%patch48 -p1
%patch49 -p1
%build
cp %{SOURCE1} .
@ -160,6 +171,11 @@ rm -rf %{buildroot}
%{_includedir}/*
%changelog
* Wed Aug 09 2023 Edaurd Abdullin <eabdullin@almalinux.org> - 7.3.2-4.1.alma
- 0029-Fix-invalid-structure-size-error-during-crash-startu.patch
- 0030-arm64-Fix-again-segfault.patch
- 0031-diskdump-netdump-fix-segmentation-fault.patch
* Tue May 16 2023 Andrew Lukoshko <alukoshko@almalinux.org> - 7.3.2-4.alma
- Debrand for AlmaLinux