diff options
| author | Kees Cook <keescook@chromium.org> | 2022-11-17 15:43:26 -0800 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2022-12-02 13:04:44 -0800 |
| commit | 8b05aa26336113c4cea25f1c333ee8cd4fc212a6 (patch) | |
| tree | 061b9e1f0dba9dfe74bd0711203176d64de29bca | |
| parent | 9fc9e278a5c0b708eeffaf47d6eb0c82aa74ed78 (diff) | |
panic: Expose "warn_count" to sysfs
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
| -rw-r--r-- | Documentation/ABI/testing/sysfs-kernel-warn_count | 6 | ||||
| -rw-r--r-- | MAINTAINERS | 1 | ||||
| -rw-r--r-- | kernel/panic.c | 22 |
3 files changed, 27 insertions, 2 deletions
diff --git a/Documentation/ABI/testing/sysfs-kernel-warn_count b/Documentation/ABI/testing/sysfs-kernel-warn_count new file mode 100644 index 000000000000..08f083d2fd51 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-kernel-warn_count @@ -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. diff --git a/MAINTAINERS b/MAINTAINERS index 0a1e95a58e54..282cd8a513fd 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -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 diff --git a/kernel/panic.c b/kernel/panic.c index f4403fc14f67..54deb743b2d5 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -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); |