exit: Expose "oops_count" to sysfs
commit 9db89b41117024f80b38b15954017fb293133364 upstream. 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 Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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2 changed files with 26 additions and 2 deletions
6
Documentation/ABI/testing/sysfs-kernel-oops_count
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6
Documentation/ABI/testing/sysfs-kernel-oops_count
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@ -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 Oopsed since last boot.
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@ -62,6 +62,7 @@
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#include <linux/random.h>
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#include <linux/rcuwait.h>
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#include <linux/compat.h>
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#include <linux/sysfs.h>
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#include <linux/uaccess.h>
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#include <asm/unistd.h>
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@ -95,6 +96,25 @@ static __init int kernel_exit_sysctls_init(void)
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late_initcall(kernel_exit_sysctls_init);
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#endif
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static atomic_t oops_count = ATOMIC_INIT(0);
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#ifdef CONFIG_SYSFS
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static ssize_t oops_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(&oops_count));
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}
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static struct kobj_attribute oops_count_attr = __ATTR_RO(oops_count);
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static __init int kernel_exit_sysfs_init(void)
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{
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sysfs_add_file_to_group(kernel_kobj, &oops_count_attr.attr, NULL);
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return 0;
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}
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late_initcall(kernel_exit_sysfs_init);
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#endif
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static void __unhash_process(struct task_struct *p, bool group_dead)
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{
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nr_threads--;
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@ -951,8 +971,6 @@ EXPORT_SYMBOL_GPL(do_exit);
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void __noreturn make_task_dead(int signr)
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{
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static atomic_t oops_count = ATOMIC_INIT(0);
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/*
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* Take the task off the cpu after something catastrophic has
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* happened.
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