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panic: Expose "warn_count" to sysfs
commit 8b05aa2633
upstream.
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
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Documentation/ABI/testing/sysfs-kernel-warn_count
Normal file
6
Documentation/ABI/testing/sysfs-kernel-warn_count
Normal file
@ -0,0 +1,6 @@
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What: /sys/kernel/oops_count
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Date: November 2022
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KernelVersion: 6.2.0
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Contact: Linux Kernel Hardening List <linux-hardening@vger.kernel.org>
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Description:
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Shows how many times the system has Warned since last boot.
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@ -28,6 +28,7 @@
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#include <linux/console.h>
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#include <linux/bug.h>
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#include <linux/ratelimit.h>
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#include <linux/sysfs.h>
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#define PANIC_TIMER_STEP 100
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#define PANIC_BLINK_SPD 18
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@ -68,6 +69,25 @@ static __init int kernel_panic_sysctls_init(void)
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late_initcall(kernel_panic_sysctls_init);
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#endif
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static atomic_t warn_count = ATOMIC_INIT(0);
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#ifdef CONFIG_SYSFS
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static ssize_t warn_count_show(struct kobject *kobj, struct kobj_attribute *attr,
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char *page)
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{
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return sysfs_emit(page, "%d\n", atomic_read(&warn_count));
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}
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static struct kobj_attribute warn_count_attr = __ATTR_RO(warn_count);
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static __init int kernel_panic_sysfs_init(void)
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{
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sysfs_add_file_to_group(kernel_kobj, &warn_count_attr.attr, NULL);
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return 0;
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}
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late_initcall(kernel_panic_sysfs_init);
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#endif
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static long no_blink(int state)
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{
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return 0;
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@ -145,8 +165,6 @@ EXPORT_SYMBOL(nmi_panic);
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void check_panic_on_warn(const char *origin)
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{
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static atomic_t warn_count = ATOMIC_INIT(0);
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if (panic_on_warn)
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panic("%s: panic_on_warn set ...\n", origin);
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