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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
This commit is contained in:
Kees Cook 2022-11-17 15:43:23 -08:00
parent d4ccd54d28
commit 9db89b4111
3 changed files with 27 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
Documentation/ABI/testing/sysfs-kernel-oops_count Normal file
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@ -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.

1
MAINTAINERS
View File

@ -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

22
kernel/exit.c
View File

@ -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.