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| author | Kees Cook <keescook@chromium.org> | 2023-02-02 16:27:15 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-02-06 07:49:46 +0100 |
| commit | 4d00e68cfcfd91d3a8c794d47617429a96d623ed (patch) | |
| tree | ff1b2cdfe59d60166ee57ff552479a9b71fc5873 /kernel/panic.c | |
| parent | a40af7cd60635230aec5c29c1b2a714bf53fbdc0 (diff) | |
| download | linux-stable-4d00e68cfcfd91d3a8c794d47617429a96d623ed.tar.gz linux-stable-4d00e68cfcfd91d3a8c794d47617429a96d623ed.tar.bz2 linux-stable-4d00e68cfcfd91d3a8c794d47617429a96d623ed.zip | |
panic: Expose "warn_count" to sysfs
commit 8b05aa26336113c4cea25f1c333ee8cd4fc212a6 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>
Diffstat (limited to 'kernel/panic.c')
| -rw-r--r-- | kernel/panic.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/kernel/panic.c b/kernel/panic.c index d1a5360262f0..dbb6e27d33e1 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -29,6 +29,7 @@ #include <linux/bug.h> #include <linux/ratelimit.h> #include <linux/debugfs.h> +#include <linux/sysfs.h> #include <asm/sections.h> #define PANIC_TIMER_STEP 100 @@ -71,6 +72,25 @@ 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; @@ -148,8 +168,6 @@ EXPORT_SYMBOL(nmi_panic); 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); |