lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Message-ID: <20220615090010.1544152-1-yebin10@huawei.com> Date: Wed, 15 Jun 2022 17:00:10 +0800 From: Ye Bin <yebin10@...wei.com> To: <jack@...e.cz>, <linux-ext4@...r.kernel.org> CC: <linux-kernel@...r.kernel.org>, Ye Bin <yebin10@...wei.com> Subject: [PATCH -next] ext2: fix fs corruption when trying to remove a non-empty directory with IO error We got issue as follows: [home]# mount /dev/sdd test [home]# cd test [test]# ls dir1 lost+found [test]# rmdir dir1 ext2_empty_dir: inject fault [test]# ls lost+found [test]# cd .. [home]# umount test [home]# fsck.ext2 -fn /dev/sdd e2fsck 1.42.9 (28-Dec-2013) Pass 1: Checking inodes, blocks, and sizes Inode 4065, i_size is 0, should be 1024. Fix? no Pass 2: Checking directory structure Pass 3: Checking directory connectivity Unconnected directory inode 4065 (/???) Connect to /lost+found? no '..' in ... (4065) is / (2), should be <The NULL inode> (0). Fix? no Pass 4: Checking reference counts Inode 2 ref count is 3, should be 4. Fix? no Inode 4065 ref count is 2, should be 3. Fix? no Pass 5: Checking group summary information /dev/sdd: ********** WARNING: Filesystem still has errors ********** /dev/sdd: 14/128016 files (0.0% non-contiguous), 18477/512000 blocks Reason is same with commit 7aab5c84a0f6. We can't assume directory is empty when read directory entry failed. Signed-off-by: Ye Bin <yebin10@...wei.com> --- fs/ext2/dir.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) diff --git a/fs/ext2/dir.c b/fs/ext2/dir.c index 3bd5772b401b..8f597753ac12 100644 --- a/fs/ext2/dir.c +++ b/fs/ext2/dir.c @@ -672,17 +672,14 @@ int ext2_empty_dir (struct inode * inode) void *page_addr = NULL; struct page *page = NULL; unsigned long i, npages = dir_pages(inode); - int dir_has_error = 0; for (i = 0; i < npages; i++) { char *kaddr; ext2_dirent * de; - page = ext2_get_page(inode, i, dir_has_error, &page_addr); + page = ext2_get_page(inode, i, 0, &page_addr); - if (IS_ERR(page)) { - dir_has_error = 1; - continue; - } + if (IS_ERR(page)) + goto not_empty; kaddr = page_addr; de = (ext2_dirent *)kaddr; -- 2.31.1
Powered by blists - more mailing lists