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 X-Spam-Level: X-Spam-Status: No, score=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1CC44C433EF for ; Thu, 16 Sep 2021 17:09:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0793960F48 for ; Thu, 16 Sep 2021 17:09:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1349636AbhIPRLM (ORCPT ); Thu, 16 Sep 2021 13:11:12 -0400 Received: from mail.kernel.org ([198.145.29.99]:34024 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1349180AbhIPRDu (ORCPT ); Thu, 16 Sep 2021 13:03:50 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 83A9461B06; Thu, 16 Sep 2021 16:34:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1631810074; bh=6G4IsplKoyeetAmOlTy7tdSl++/n/23XqHH2qpFwkFM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OhfT5/vg9j9Wk2vjhnJsiF+r2V+e+wsYbMAnXeCQOrsrvR+utr6JV65VyNDiIQhmP mOjUmJztAVezyLz48CgmwixhQVhupjBJ6OgZUgj7FAovpB11c1q/6sJO338gMGtypF 2fem7LDfnPW5qk5hFOzfKln6qYupyHVP7Ziu2H0o= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Petr Mladek , Sergey Senozhatsky , John Ogness , kernel test robot Subject: [PATCH 5.13 348/380] printk/console: Check consistent sequence number when handling race in console_unlock() Date: Thu, 16 Sep 2021 18:01:45 +0200 Message-Id: <20210916155815.886427268@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210916155803.966362085@linuxfoundation.org> References: <20210916155803.966362085@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Petr Mladek commit 11e4b63abbe23872b45f325a7c6c8b7f9ff42cad upstream. The standard printk() tries to flush the message to the console immediately. It tries to take the console lock. If the lock is already taken then the current owner is responsible for flushing even the new message. There is a small race window between checking whether a new message is available and releasing the console lock. It is solved by re-checking the state after releasing the console lock. If the check is positive then console_unlock() tries to take the lock again and process the new message as well. The commit 996e966640ddea7b535c ("printk: remove logbuf_lock") causes that console_seq is not longer read atomically. As a result, the re-check might be done with an inconsistent 64-bit index. Solve it by using the last sequence number that has been checked under the console lock. In the worst case, it will take the lock again only to realized that the new message has already been proceed. But it was possible even before. The variable next_seq is marked as __maybe_unused to call down compiler warning when CONFIG_PRINTK is not defined. Fixes: commit 996e966640ddea7b535c ("printk: remove logbuf_lock") Reported-by: kernel test robot # unused next_seq warning Cc: stable@vger.kernel.org # 5.13 Signed-off-by: Petr Mladek Acked-by: Sergey Senozhatsky Reviewed-by: John Ogness Link: https://lore.kernel.org/r/20210702150657.26760-1-pmladek@suse.com Signed-off-by: Greg Kroah-Hartman --- kernel/printk/printk.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -2545,6 +2545,7 @@ void console_unlock(void) bool do_cond_resched, retry; struct printk_info info; struct printk_record r; + u64 __maybe_unused next_seq; if (console_suspended) { up_console_sem(); @@ -2654,8 +2655,10 @@ skip: cond_resched(); } - console_locked = 0; + /* Get consistent value of the next-to-be-used sequence number. */ + next_seq = console_seq; + console_locked = 0; up_console_sem(); /* @@ -2664,7 +2667,7 @@ skip: * there's a new owner and the console_unlock() from them will do the * flush, no worries. */ - retry = prb_read_valid(prb, console_seq, NULL); + retry = prb_read_valid(prb, next_seq, NULL); printk_safe_exit_irqrestore(flags); if (retry && console_trylock())