diff options
| -rw-r--r-- | Documentation/ABI/testing/sysfs-kernel-oops_count | 6 | ||||
| -rw-r--r-- | MAINTAINERS | 1 | ||||
| -rw-r--r-- | kernel/exit.c | 22 |
3 files changed, 27 insertions, 2 deletions
diff --git a/Documentation/ABI/testing/sysfs-kernel-oops_count b/Documentation/ABI/testing/sysfs-kernel-oops_count new file mode 100644 index 000000000000..156cca9dbc96 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-kernel-oops_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 Oopsed since last boot. diff --git a/MAINTAINERS b/MAINTAINERS index 1cd80c113721..0a1e95a58e54 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -11106,6 +11106,7 @@ M: Kees Cook <keescook@chromium.org> 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: include/linux/overflow.h F: include/linux/randomize_kstack.h F: mm/usercopy.c 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. |