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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,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 0270FC10F0E for ; Mon, 15 Apr 2019 07:31:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D0BAB206BA for ; Mon, 15 Apr 2019 07:31:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726759AbfDOHbZ (ORCPT ); Mon, 15 Apr 2019 03:31:25 -0400 Received: from szxga08-in.huawei.com ([45.249.212.255]:45622 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725851AbfDOHbF (ORCPT ); Mon, 15 Apr 2019 03:31:05 -0400 Received: from DGGEMM404-HUB.china.huawei.com (unknown [172.30.72.53]) by Forcepoint Email with ESMTP id AA9E8B7DF60FF1B436AE; Mon, 15 Apr 2019 15:31:03 +0800 (CST) Received: from dggeme763-chm.china.huawei.com (10.3.19.109) by DGGEMM404-HUB.china.huawei.com (10.3.20.212) with Microsoft SMTP Server (TLS) id 14.3.408.0; Mon, 15 Apr 2019 15:31:03 +0800 Received: from szvp000201624.huawei.com (10.120.216.130) by dggeme763-chm.china.huawei.com (10.3.19.109) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1591.10; Mon, 15 Apr 2019 15:31:02 +0800 From: Chao Yu To: CC: , , , Chao Yu Subject: [PATCH 11/13] f2fs: fix to avoid panic in f2fs_inplace_write_data() Date: Mon, 15 Apr 2019 15:30:52 +0800 Message-ID: <20190415073054.2577-3-yuchao0@huawei.com> X-Mailer: git-send-email 2.18.0.rc1 In-Reply-To: <20190415073054.2577-1-yuchao0@huawei.com> References: <20190415073054.2577-1-yuchao0@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.120.216.130] X-ClientProxiedBy: dggeme710-chm.china.huawei.com (10.1.199.106) To dggeme763-chm.china.huawei.com (10.3.19.109) X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org As Jungyeon reported in bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=203239 - Overview When mounting the attached crafted image and running program, following errors are reported. Additionally, it hangs on sync after running program. The image is intentionally fuzzed from a normal f2fs image for testing. Compile options for F2FS are as follows. CONFIG_F2FS_FS=y CONFIG_F2FS_STAT_FS=y CONFIG_F2FS_FS_XATTR=y CONFIG_F2FS_FS_POSIX_ACL=y CONFIG_F2FS_CHECK_FS=y - Reproduces cc poc_15.c ./run.sh f2fs sync - Kernel messages ------------[ cut here ]------------ kernel BUG at fs/f2fs/segment.c:3162! RIP: 0010:f2fs_inplace_write_data+0x12d/0x160 Call Trace: f2fs_do_write_data_page+0x3c1/0x820 __write_data_page+0x156/0x720 f2fs_write_cache_pages+0x20d/0x460 f2fs_write_data_pages+0x1b4/0x300 do_writepages+0x15/0x60 __filemap_fdatawrite_range+0x7c/0xb0 file_write_and_wait_range+0x2c/0x80 f2fs_do_sync_file+0x102/0x810 do_fsync+0x33/0x60 __x64_sys_fsync+0xb/0x10 do_syscall_64+0x43/0xf0 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The reason is f2fs_inplace_write_data() will trigger kernel panic due to data block locates in node type segment. To avoid panic, let's just return error code and set SBI_NEED_FSCK to give a hint to fsck for latter repairing. Signed-off-by: Chao Yu --- fs/f2fs/segment.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index b59d1c85863b..8388d2abacb5 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -3184,13 +3184,18 @@ int f2fs_inplace_write_data(struct f2fs_io_info *fio) { int err; struct f2fs_sb_info *sbi = fio->sbi; + unsigned int segno; fio->new_blkaddr = fio->old_blkaddr; /* i/o temperature is needed for passing down write hints */ __get_segment_type(fio); - f2fs_bug_on(sbi, !IS_DATASEG(get_seg_entry(sbi, - GET_SEGNO(sbi, fio->new_blkaddr))->type)); + segno = GET_SEGNO(sbi, fio->new_blkaddr); + + if (!IS_DATASEG(get_seg_entry(sbi, segno)->type)) { + set_sbi_flag(sbi, SBI_NEED_FSCK); + return -EFAULT; + } stat_inc_inplace_blocks(fio->sbi); -- 2.18.0.rc1