diff options
| author | Kees Cook <keescook@chromium.org> | 2022-11-18 00:43:23 +0100 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2022-12-01 17:50:38 +0100 |
| commit | 9db89b41117024f80b38b15954017fb293133364 (patch) | |
| tree | ef440809489f6dba2ba0622c870344b8e1f0b9a3 /kernel/exit.c | |
| parent | exit: Put an upper limit on how often we can oops (diff) | |
| download | linux-9db89b41117024f80b38b15954017fb293133364.tar.xz linux-9db89b41117024f80b38b15954017fb293133364.zip | |
exit: Expose "oops_count" to sysfs
Since Oops count is now tracked and is a fairly interesting signal, add
the entry /sys/kernel/oops_count to expose it to userspace.
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Jann Horn <jannh@google.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20221117234328.594699-3-keescook@chromium.org
Diffstat (limited to 'kernel/exit.c')
| -rw-r--r-- | kernel/exit.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/kernel/exit.c b/kernel/exit.c index 2ab3ead62118..dc1a32149f94 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -67,6 +67,7 @@ #include <linux/io_uring.h> #include <linux/kprobes.h> #include <linux/rethook.h> +#include <linux/sysfs.h> #include <linux/uaccess.h> #include <asm/unistd.h> @@ -99,6 +100,25 @@ static __init int kernel_exit_sysctls_init(void) late_initcall(kernel_exit_sysctls_init); #endif +static atomic_t oops_count = ATOMIC_INIT(0); + +#ifdef CONFIG_SYSFS +static ssize_t oops_count_show(struct kobject *kobj, struct kobj_attribute *attr, + char *page) +{ + return sysfs_emit(page, "%d\n", atomic_read(&oops_count)); +} + +static struct kobj_attribute oops_count_attr = __ATTR_RO(oops_count); + +static __init int kernel_exit_sysfs_init(void) +{ + sysfs_add_file_to_group(kernel_kobj, &oops_count_attr.attr, NULL); + return 0; +} +late_initcall(kernel_exit_sysfs_init); +#endif + static void __unhash_process(struct task_struct *p, bool group_dead) { nr_threads--; @@ -901,8 +921,6 @@ void __noreturn do_exit(long code) void __noreturn make_task_dead(int signr) { - static atomic_t oops_count = ATOMIC_INIT(0); - /* * Take the task off the cpu after something catastrophic has * happened. |