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panic: Expose "warn_count" to sysfs

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Since Warn count is now tracked and is a fairly interesting signal, add
the entry /sys/kernel/warn_count to expose it to userspace.

Cc: Petr Mladek <pmladek@suse.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: tangmeng <tangmeng@uniontech.com>
Cc: "Guilherme G. Piccoli" <gpiccoli@igalia.com>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Tiezhu Yang <yangtiezhu@loongson.cn>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20221117234328.594699-6-keescook@chromium.org
This commit is contained in:
Kees Cook 2022-11-17 15:43:26 -08:00
parent 9fc9e278a5
commit 8b05aa2633
3 changed files with 27 additions and 2 deletions
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6
Documentation/ABI/testing/sysfs-kernel-warn_count Normal file
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@ -0,0 +1,6 @@
What: /sys/kernel/oops_count
Date: November 2022
KernelVersion: 6.2.0
Contact: Linux Kernel Hardening List <linux-hardening@vger.kernel.org>
Description:
Shows how many times the system has Warned since last boot.

1
MAINTAINERS
View File

@ -11107,6 +11107,7 @@ L: linux-hardening@vger.kernel.org
S: Supported
T: git git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/hardening
F: Documentation/ABI/testing/sysfs-kernel-oops_count
F: Documentation/ABI/testing/sysfs-kernel-warn_count
F: include/linux/overflow.h
F: include/linux/randomize_kstack.h
F: mm/usercopy.c

22
kernel/panic.c
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@ -32,6 +32,7 @@
#include <linux/bug.h>
#include <linux/ratelimit.h>
#include <linux/debugfs.h>
#include <linux/sysfs.h>
#include <trace/events/error_report.h>
#include <asm/sections.h>
@ -107,6 +108,25 @@ static __init int kernel_panic_sysctls_init(void)
late_initcall(kernel_panic_sysctls_init);
#endif
static atomic_t warn_count = ATOMIC_INIT(0);
#ifdef CONFIG_SYSFS
static ssize_t warn_count_show(struct kobject *kobj, struct kobj_attribute *attr,
char *page)
{
return sysfs_emit(page, "%d\n", atomic_read(&warn_count));
}
static struct kobj_attribute warn_count_attr = __ATTR_RO(warn_count);
static __init int kernel_panic_sysfs_init(void)
{
sysfs_add_file_to_group(kernel_kobj, &warn_count_attr.attr, NULL);
return 0;
}
late_initcall(kernel_panic_sysfs_init);
#endif
static long no_blink(int state)
{
return 0;
@ -211,8 +231,6 @@ static void panic_print_sys_info(bool console_flush)
void check_panic_on_warn(const char *origin)
{
static atomic_t warn_count = ATOMIC_INIT(0);
if (panic_on_warn)
panic("%s: panic_on_warn set ...\n", origin);