diff options
| author | Zeng Heng <zengheng4@huawei.com> | 2022-12-12 09:31:34 +0800 |
|---|---|---|
| committer | Konstantin Komarov <almaz.alexandrovich@paragon-software.com> | 2023-03-27 16:59:12 +0400 |
| commit | ab84eee4c7ab929996602eda7832854c35a6dda2 (patch) | |
| tree | 4c24912319787b6a504065e731313792a76477de /fs/ntfs3 | |
| parent | 98bea253aa28ad8be2ce565a9ca21beb4a9419e5 (diff) | |
fs/ntfs3: Fix slab-out-of-bounds read in hdr_delete_de()
Here is a BUG report from syzbot:
BUG: KASAN: slab-out-of-bounds in hdr_delete_de+0xe0/0x150 fs/ntfs3/index.c:806
Read of size 16842960 at addr ffff888079cc0600 by task syz-executor934/3631
Call Trace:
memmove+0x25/0x60 mm/kasan/shadow.c:54
hdr_delete_de+0xe0/0x150 fs/ntfs3/index.c:806
indx_delete_entry+0x74f/0x3670 fs/ntfs3/index.c:2193
ni_remove_name+0x27a/0x980 fs/ntfs3/frecord.c:2910
ntfs_unlink_inode+0x3d4/0x720 fs/ntfs3/inode.c:1712
ntfs_rename+0x41a/0xcb0 fs/ntfs3/namei.c:276
Before using the meta-data in struct INDEX_HDR, we need to
check index header valid or not. Otherwise, the corruptedi
(or malicious) fs image can cause out-of-bounds access which
could make kernel panic.
Fixes: 82cae269cfa9 ("fs/ntfs3: Add initialization of super block")
Reported-by: syzbot+9c2811fd56591639ff5f@syzkaller.appspotmail.com
Signed-off-by: Zeng Heng <zengheng4@huawei.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Diffstat (limited to 'fs/ntfs3')
| -rw-r--r-- | fs/ntfs3/fslog.c | 2 | ||||
| -rw-r--r-- | fs/ntfs3/index.c | 4 | ||||
| -rw-r--r-- | fs/ntfs3/ntfs_fs.h | 1 |
3 files changed, 6 insertions, 1 deletions
diff --git a/fs/ntfs3/fslog.c b/fs/ntfs3/fslog.c index dc723f03d6bb..bf7396447284 100644 --- a/fs/ntfs3/fslog.c +++ b/fs/ntfs3/fslog.c @@ -2575,7 +2575,7 @@ static int read_next_log_rec(struct ntfs_log *log, struct lcb *lcb, u64 *lsn) return find_log_rec(log, *lsn, lcb); } -static inline bool check_index_header(const struct INDEX_HDR *hdr, size_t bytes) +bool check_index_header(const struct INDEX_HDR *hdr, size_t bytes) { __le16 mask; u32 min_de, de_off, used, total; diff --git a/fs/ntfs3/index.c b/fs/ntfs3/index.c index ae9616becec1..7a1e01a2ed9a 100644 --- a/fs/ntfs3/index.c +++ b/fs/ntfs3/index.c @@ -848,6 +848,10 @@ static inline struct NTFS_DE *hdr_delete_de(struct INDEX_HDR *hdr, u32 off = PtrOffset(hdr, re); int bytes = used - (off + esize); + /* check INDEX_HDR valid before using INDEX_HDR */ + if (!check_index_header(hdr, le32_to_cpu(hdr->total))) + return NULL; + if (off >= used || esize < sizeof(struct NTFS_DE) || bytes < sizeof(struct NTFS_DE)) return NULL; diff --git a/fs/ntfs3/ntfs_fs.h b/fs/ntfs3/ntfs_fs.h index 80072e5f96f7..15296f5690b5 100644 --- a/fs/ntfs3/ntfs_fs.h +++ b/fs/ntfs3/ntfs_fs.h @@ -581,6 +581,7 @@ int ni_rename(struct ntfs_inode *dir_ni, struct ntfs_inode *new_dir_ni, bool ni_is_dirty(struct inode *inode); /* Globals from fslog.c */ +bool check_index_header(const struct INDEX_HDR *hdr, size_t bytes); int log_replay(struct ntfs_inode *ni, bool *initialized); /* Globals from fsntfs.c */ |