From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 830F91FB9 for ; Fri, 3 Feb 2023 10:20:54 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 04CD3C433D2; Fri, 3 Feb 2023 10:20:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1675419654; bh=oa7tHOlecuPQs9W5vrkbnAaURhiPmPoKanwo93secLg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=yfyOvgs/hegDLcfrSZQG5hv43zzjmi6Mrqlr7ow/mqO6vjeDm5ZihAZqY1cgC5xe4 C39oNPZoQy01CDAzbHMabf/OhHl07LCKQdk/Wi/M/ZwazMdUib3TKf+qhpj749lTnl /zzQprNFIb/I8GdC1HqdwWN6Gk59sfwQNN+mU/+A= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, "Eric W. Biederman" , Jann Horn , Arnd Bergmann , Luis Chamberlain , Kees Cook , Eric Biggers Subject: [PATCH 4.19 72/80] exit: Expose "oops_count" to sysfs Date: Fri, 3 Feb 2023 11:13:06 +0100 Message-Id: <20230203101018.316619998@linuxfoundation.org> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230203101015.263854890@linuxfoundation.org> References: <20230203101015.263854890@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Kees Cook 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" Cc: Jann Horn Cc: Arnd Bergmann Reviewed-by: Luis Chamberlain Signed-off-by: Kees Cook Link: https://lore.kernel.org/r/20221117234328.594699-3-keescook@chromium.org Signed-off-by: Eric Biggers Signed-off-by: Greg Kroah-Hartman --- Documentation/ABI/testing/sysfs-kernel-oops_count | 6 ++++++ kernel/exit.c | 22 ++++++++++++++++++++-- 2 files changed, 26 insertions(+), 2 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-kernel-oops_count --- /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 +Description: + Shows how many times the system has Oopsed since last boot. --- a/kernel/exit.c +++ b/kernel/exit.c @@ -62,6 +62,7 @@ #include #include #include +#include #include #include @@ -95,6 +96,25 @@ static __init int kernel_exit_sysctls_in 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--; @@ -951,8 +971,6 @@ EXPORT_SYMBOL_GPL(do_exit); 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.