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=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,T_DKIMWL_WL_HIGH,URIBL_BLOCKED,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 5D7D4C28CC1 for ; Sat, 1 Jun 2019 13:38:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 30CA027606 for ; Sat, 1 Jun 2019 13:38:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559396307; bh=QlXIHikvXIYteNVMeavySQDatlybYcwTP55rPq29LTE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=mVMwajaWMU1Hto8GNM2A3ErbWqiPv60pZDFeD+iCk+1xYiMO0giPuAQH9P2uJtj8y zWveoxg8XX3f5JI1eWPbwJzRaacqKlPcM4vGhfUUB8U5hY2AxzXLnMmJS7O/ieGu2M SGcyIIylq1Euyr7T/hFPlJoVs9giaF561sRdm5Ms= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729212AbfFANi0 (ORCPT ); Sat, 1 Jun 2019 09:38:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:48886 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728526AbfFANVa (ORCPT ); Sat, 1 Jun 2019 09:21:30 -0400 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 A17C8272F3; Sat, 1 Jun 2019 13:21:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559395289; bh=QlXIHikvXIYteNVMeavySQDatlybYcwTP55rPq29LTE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Y2J9+ONMv7oIsB9dgdVqsZzSXvdto6CSM/9116b/CpAvtli1/4Fwbs4dUcnUoegF7 qWxAQ7ET1AU/Nn0FOX/dIvb084aNhWxBw9WUbZLSbtcIXIh1jtrpUmBiSGlzNepGib MgL+zglUdfxZqG6mdA5KXS8yu3RVWkV3p1uRChPM= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Chao Yu , Jaegeuk Kim , Sasha Levin , linux-f2fs-devel@lists.sourceforge.net Subject: [PATCH AUTOSEL 5.0 052/173] f2fs: fix to do checksum even if inode page is uptodate Date: Sat, 1 Jun 2019 09:17:24 -0400 Message-Id: <20190601131934.25053-52-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190601131934.25053-1-sashal@kernel.org> References: <20190601131934.25053-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Chao Yu [ Upstream commit b42b179bda9ff11075a6fc2bac4d9e400513679a ] As Jungyeon reported in bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=203221 - Overview When mounting the attached crafted image and running program, this error is reported. The image is intentionally fuzzed from a normal f2fs image for testing and I enabled option CONFIG_F2FS_CHECK_FS on. - Reproduces cc poc_07.c mkdir test mount -t f2fs tmp.img test cp a.out test cd test sudo ./a.out - Messages kernel BUG at fs/f2fs/node.c:1279! RIP: 0010:read_node_page+0xcf/0xf0 Call Trace: __get_node_page+0x6b/0x2f0 f2fs_iget+0x8f/0xdf0 f2fs_lookup+0x136/0x320 __lookup_slow+0x92/0x140 lookup_slow+0x30/0x50 walk_component+0x1c1/0x350 path_lookupat+0x62/0x200 filename_lookup+0xb3/0x1a0 do_fchmodat+0x3e/0xa0 __x64_sys_chmod+0x12/0x20 do_syscall_64+0x43/0xf0 entry_SYSCALL_64_after_hwframe+0x44/0xa9 On below paths, we can have opportunity to readahead inode page - gc_node_segment -> f2fs_ra_node_page - gc_data_segment -> f2fs_ra_node_page - f2fs_fill_dentries -> f2fs_ra_node_page Unlike synchronized read, on readahead path, we can set page uptodate before verifying page's checksum, then read_node_page() will trigger kernel panic once it encounters a uptodated page w/ incorrect checksum. So considering readahead scenario, we have to do checksum each time when loading inode page even if it is uptodated. Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim Signed-off-by: Sasha Levin --- fs/f2fs/inode.c | 4 ++-- fs/f2fs/node.c | 7 ++++--- 2 files changed, 6 insertions(+), 5 deletions(-) diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c index 8c8d40e07ebaf..24c81703ec56f 100644 --- a/fs/f2fs/inode.c +++ b/fs/f2fs/inode.c @@ -176,8 +176,8 @@ bool f2fs_inode_chksum_verify(struct f2fs_sb_info *sbi, struct page *page) if (provided != calculated) f2fs_msg(sbi->sb, KERN_WARNING, - "checksum invalid, ino = %x, %x vs. %x", - ino_of_node(page), provided, calculated); + "checksum invalid, nid = %lu, ino_of_node = %x, %x vs. %x", + page->index, ino_of_node(page), provided, calculated); return provided == calculated; } diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c index 63bb6134d39ae..e29d5f6735ae9 100644 --- a/fs/f2fs/node.c +++ b/fs/f2fs/node.c @@ -1281,9 +1281,10 @@ static int read_node_page(struct page *page, int op_flags) int err; if (PageUptodate(page)) { -#ifdef CONFIG_F2FS_CHECK_FS - f2fs_bug_on(sbi, !f2fs_inode_chksum_verify(sbi, page)); -#endif + if (!f2fs_inode_chksum_verify(sbi, page)) { + ClearPageUptodate(page); + return -EBADMSG; + } return LOCKED_PAGE; } -- 2.20.1