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b=baHhPeuRH5auV+myfyVjX8rvvf IyWBGt9O53ijFrKmZVyfreQC39j2bcWgeACRZmGMRzLk2g0HZ+snAhXR05Q9cd0LJMsS7b83eF673 Vqyyg3cr060nSzU8j/UtgREH3hgMk+LJyt0p09oEQVLucz2hQMNSgDNigR5B+IZFhrmU=; Received: from dfw.source.kernel.org ([139.178.84.217]) by sfi-mx-2.v28.lw.sourceforge.com with esmtps (TLS1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.95) id 1sEpCW-000058-U3 for linux-f2fs-devel@lists.sourceforge.net; Wed, 05 Jun 2024 11:53:08 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id CCDB56187D; Wed, 5 Jun 2024 11:53:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B1BB6C4AF07; Wed, 5 Jun 2024 11:53:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1717588382; bh=RRQkgtyusECkJBoYg3oUy7UVIQQ61c3d9foSQSMCJhU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ohpeP1jnjr+wxg8HbxQAxD0Tn9DVX0A1sBJO1pkJqKsukoAKWRIsWCKGHEnn8Xs/L GxINbgceAgU53d6KOn7KI6ke7mwc0buwjee5c2zb/23O105CtKmDKvzhRQmT3JaBK3 4UhYJ3yp+nRFK0hWV+lH3w2FgeC9tghMRn/dIjNQJ/W9oF0EeYE1tCZBCQ05HYUyel w/1UkZM6cuQrMKlOTFs72eMP6khaWw2jmEZISs7hGAMTr9y78y107JtKiymoE0te/H Q/7oKwDuX+rQXGrjVTQWOV3MaI/fEV6MddiYB/JFTuseF69Bw+JuDSRE/E7hypNODs f8oNCqWo1D8pw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Date: Wed, 5 Jun 2024 07:51:57 -0400 Message-ID: <20240605115225.2963242-14-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240605115225.2963242-1-sashal@kernel.org> References: <20240605115225.2963242-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.6.32 X-Headers-End: 1sEpCW-000058-U3 Subject: [f2fs-dev] [PATCH AUTOSEL 6.6 14/20] f2fs: fix to do sanity check on i_xattr_nid in sanity_check_inode() 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 , syzbot+3694e283cf5c40df6d14@syzkaller.appspotmail.com, 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: Chao Yu [ Upstream commit 20faaf30e55522bba2b56d9c46689233205d7717 ] syzbot reports a kernel bug as below: F2FS-fs (loop0): Mounted with checkpoint version = 48b305e4 ================================================================== BUG: KASAN: slab-out-of-bounds in f2fs_test_bit fs/f2fs/f2fs.h:2933 [inline] BUG: KASAN: slab-out-of-bounds in current_nat_addr fs/f2fs/node.h:213 [inline] BUG: KASAN: slab-out-of-bounds in f2fs_get_node_info+0xece/0x1200 fs/f2fs/node.c:600 Read of size 1 at addr ffff88807a58c76c by task syz-executor280/5076 CPU: 1 PID: 5076 Comm: syz-executor280 Not tainted 6.9.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 f2fs_test_bit fs/f2fs/f2fs.h:2933 [inline] current_nat_addr fs/f2fs/node.h:213 [inline] f2fs_get_node_info+0xece/0x1200 fs/f2fs/node.c:600 f2fs_xattr_fiemap fs/f2fs/data.c:1848 [inline] f2fs_fiemap+0x55d/0x1ee0 fs/f2fs/data.c:1925 ioctl_fiemap fs/ioctl.c:220 [inline] do_vfs_ioctl+0x1c07/0x2e50 fs/ioctl.c:838 __do_sys_ioctl fs/ioctl.c:902 [inline] __se_sys_ioctl+0x81/0x170 fs/ioctl.c:890 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The root cause is we missed to do sanity check on i_xattr_nid during f2fs_iget(), so that in fiemap() path, current_nat_addr() will access nat_bitmap w/ offset from invalid i_xattr_nid, result in triggering kasan bug report, fix it. Reported-and-tested-by: syzbot+3694e283cf5c40df6d14@syzkaller.appspotmail.com Closes: https://lore.kernel.org/linux-f2fs-devel/00000000000094036c0616e72a1d@google.com Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim Signed-off-by: Sasha Levin --- fs/f2fs/inode.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c index dd61449f05b85..ab2eecd986ec5 100644 --- a/fs/f2fs/inode.c +++ b/fs/f2fs/inode.c @@ -361,6 +361,12 @@ static bool sanity_check_inode(struct inode *inode, struct page *node_page) return false; } + if (fi->i_xattr_nid && f2fs_check_nid_range(sbi, fi->i_xattr_nid)) { + f2fs_warn(sbi, "%s: inode (ino=%lx) has corrupted i_xattr_nid: %u, run fsck to fix.", + __func__, inode->i_ino, fi->i_xattr_nid); + return false; + } + return true; } -- 2.43.0 _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel