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=-12.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT autolearn=ham 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 612BEC433E3 for ; Fri, 21 Aug 2020 16:16:52 +0000 (UTC) Received: from lists.sourceforge.net (lists.sourceforge.net [216.105.38.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 3021022CBB; Fri, 21 Aug 2020 16:16:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=sourceforge.net header.i=@sourceforge.net header.b="jY3HA+Wy"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=sf.net header.i=@sf.net header.b="i4KMdCPa"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="TVuqtnN4" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3021022CBB Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linux-f2fs-devel-bounces@lists.sourceforge.net Received: from [127.0.0.1] (helo=sfs-ml-4.v29.lw.sourceforge.com) by sfs-ml-4.v29.lw.sourceforge.com with esmtp (Exim 4.90_1) (envelope-from ) id 1k99il-0000i0-Q4; Fri, 21 Aug 2020 16:16:51 +0000 Received: from [172.30.20.202] (helo=mx.sourceforge.net) by sfs-ml-4.v29.lw.sourceforge.com with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1k99ik-0000hm-EE for linux-f2fs-devel@lists.sourceforge.net; Fri, 21 Aug 2020 16:16:50 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sourceforge.net; s=x; h=Content-Transfer-Encoding:MIME-Version:References: In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=zLdX/T8Uh2UCeXn8u269TLDPlOtwYVF6ox46Gx+N+qk=; b=jY3HA+Wy8jCguQWzWYvKhEMJi6 OMu3rUfMSP2A9aPq3Ou+oWzSHfnk+ESos4gYDfFQprh4a0xUyPldgsSKAwcsOcU3AytlUOMGjgxkK X3oqQt63rNEig+rBOXwSNhB9R1A1g8XqWOyKoYybjwhrvPizglIy19Yh8y+uFslB556w=; DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sf.net; s=x ; h=Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-Id: Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=zLdX/T8Uh2UCeXn8u269TLDPlOtwYVF6ox46Gx+N+qk=; b=i4KMdCPafRTsUZbi9CZpRorFm0 lrE5hqeGGyLgntA3kDiBbDogC1l+V/6p4yt4NLZcMWdhvHlClvLxCxOwct4LO9+5AsSNlkmncu/+M TyZAHWtXb9Vfd/CXKKEF7cfmjyRIz8PztyJbzlN6daLPtPuk1BOCQEIPjzXqLh3ohGnY=; Received: from mail.kernel.org ([198.145.29.99]) by sfi-mx-3.v28.lw.sourceforge.com with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.92.2) id 1k99ij-000Sdx-8T for linux-f2fs-devel@lists.sourceforge.net; Fri, 21 Aug 2020 16:16:50 +0000 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1A52E22BEA; Fri, 21 Aug 2020 16:16:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598026603; bh=l4gfc2q1SPp9LVlWv9fQLokfWUFLtIw+L29wCvLl3R4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TVuqtnN4yIOsH+EP13M7VMZgkRZc9BAZ2BZZuoktfBkciE1fy9tsN330Et5wodskr CyuUasyzzRbRGJ7D7o7rHoAQznv7/BhSHHPOqysDixIzHwlG+zucwPi9Eo1YIzByZW ovz+AujW1XihhVVrUe0HWsEPmzZfAIeOdLLgBpnI= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Date: Fri, 21 Aug 2020 12:15:30 -0400 Message-Id: <20200821161545.347622-46-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200821161545.347622-1-sashal@kernel.org> References: <20200821161545.347622-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-Headers-End: 1k99ij-000Sdx-8T Subject: [f2fs-dev] [PATCH AUTOSEL 5.7 46/61] f2fs: fix use-after-free issue X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sasha Levin , Jaegeuk Kim , linux-f2fs-devel@lists.sourceforge.net Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net From: Li Guifu [ Upstream commit 99c787cfd2bd04926f1f553b30bd7dcea2caaba1 ] During umount, f2fs_put_super() unregisters procfs entries after f2fs_destroy_segment_manager(), it may cause use-after-free issue when umount races with procfs accessing, fix it by relocating f2fs_unregister_sysfs(). [Chao Yu: change commit title/message a bit] Signed-off-by: Li Guifu Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim Signed-off-by: Sasha Levin --- fs/f2fs/super.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 4696c9cb47a5f..194ac4941584e 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -1145,6 +1145,9 @@ static void f2fs_put_super(struct super_block *sb) int i; bool dropped; + /* unregister procfs/sysfs entries in advance to avoid race case */ + f2fs_unregister_sysfs(sbi); + f2fs_quota_off_umount(sb); /* prevent remaining shrinker jobs */ @@ -1210,8 +1213,6 @@ static void f2fs_put_super(struct super_block *sb) kvfree(sbi->ckpt); - f2fs_unregister_sysfs(sbi); - sb->s_fs_info = NULL; if (sbi->s_chksum_driver) crypto_free_shash(sbi->s_chksum_driver); -- 2.25.1 _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel