From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4BC0AC636D6 for ; Fri, 3 Feb 2023 10:21:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233288AbjBCKVd (ORCPT ); Fri, 3 Feb 2023 05:21:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43658 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233330AbjBCKV3 (ORCPT ); Fri, 3 Feb 2023 05:21:29 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2A7CF12F21; Fri, 3 Feb 2023 02:21:07 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id DACB061EBA; Fri, 3 Feb 2023 10:21:00 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 915CBC433D2; Fri, 3 Feb 2023 10:20:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1675419660; bh=/VgTckNen0NoZp3QkraZBalffdZWyEDO/GFqKXBbjzI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=2UsKDAgOdKmrnYVaGx8QTiPvphAiZXc1PLFJQ0QK/Sxkmss0OskLZeImq736FypTa TPmANKdaASkXR82JTNH2O0HUpafrxAyQcZ/vPV8uwIYXkJ45p6PALlGSkJf4GJqAfE xEvEWv9CbMaMgABw9z27QJUGdq//TUAg15eMCSLA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jann Horn , Jonathan Corbet , Andrew Morton , Baolin Wang , "Jason A. Donenfeld" , Eric Biggers , Huang Ying , "Eric W. Biederman" , Arnd Bergmann , linux-doc@vger.kernel.org, Kees Cook Subject: [PATCH 4.19 73/80] exit: Allow oops_limit to be disabled Date: Fri, 3 Feb 2023 11:13:07 +0100 Message-Id: <20230203101018.358100986@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 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org From: Kees Cook commit de92f65719cd672f4b48397540b9f9eff67eca40 upstream. In preparation for keeping oops_limit logic in sync with warn_limit, have oops_limit == 0 disable checking the Oops counter. Cc: Jann Horn Cc: Jonathan Corbet Cc: Andrew Morton Cc: Baolin Wang Cc: "Jason A. Donenfeld" Cc: Eric Biggers Cc: Huang Ying Cc: "Eric W. Biederman" Cc: Arnd Bergmann Cc: linux-doc@vger.kernel.org Signed-off-by: Kees Cook Signed-off-by: Eric Biggers Signed-off-by: Greg Kroah-Hartman --- Documentation/sysctl/kernel.txt | 5 +++-- kernel/exit.c | 2 +- 2 files changed, 4 insertions(+), 3 deletions(-) --- a/Documentation/sysctl/kernel.txt +++ b/Documentation/sysctl/kernel.txt @@ -559,8 +559,9 @@ scanned for a given scan. oops_limit: Number of kernel oopses after which the kernel should panic when -``panic_on_oops`` is not set. Setting this to 0 or 1 has the same effect -as setting ``panic_on_oops=1``. +``panic_on_oops`` is not set. Setting this to 0 disables checking +the count. Setting this to 1 has the same effect as setting +``panic_on_oops=1``. The default value is 10000. ============================================================== --- a/kernel/exit.c +++ b/kernel/exit.c @@ -986,7 +986,7 @@ void __noreturn make_task_dead(int signr * To make sure this can't happen, place an upper bound on how often the * kernel may oops without panic(). */ - if (atomic_inc_return(&oops_count) >= READ_ONCE(oops_limit)) + if (atomic_inc_return(&oops_count) >= READ_ONCE(oops_limit) && oops_limit) panic("Oopsed too often (kernel.oops_limit is %d)", oops_limit); do_exit(signr);