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| author | Baokun Li <libaokun1@huawei.com> | 2022-11-02 16:06:33 +0800 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2022-12-08 21:49:24 -0500 |
| commit | a71248b1accb2b42e4980afef4fa4a27fa0e36f5 (patch) | |
| tree | 57651cca5b54acf1541e4da099993942df3137c4 /fs/ext4/inode.c | |
| parent | 105c78e12468413e426625831faa7db4284e1fec (diff) | |
| download | linux-next-a71248b1accb2b42e4980afef4fa4a27fa0e36f5.tar.gz | |
ext4: fix use-after-free in ext4_orphan_cleanup
I caught a issue as follows:
==================================================================
BUG: KASAN: use-after-free in __list_add_valid+0x28/0x1a0
Read of size 8 at addr ffff88814b13f378 by task mount/710
CPU: 1 PID: 710 Comm: mount Not tainted 6.1.0-rc3-next #370
Call Trace:
<TASK>
dump_stack_lvl+0x73/0x9f
print_report+0x25d/0x759
kasan_report+0xc0/0x120
__asan_load8+0x99/0x140
__list_add_valid+0x28/0x1a0
ext4_orphan_cleanup+0x564/0x9d0 [ext4]
__ext4_fill_super+0x48e2/0x5300 [ext4]
ext4_fill_super+0x19f/0x3a0 [ext4]
get_tree_bdev+0x27b/0x450
ext4_get_tree+0x19/0x30 [ext4]
vfs_get_tree+0x49/0x150
path_mount+0xaae/0x1350
do_mount+0xe2/0x110
__x64_sys_mount+0xf0/0x190
do_syscall_64+0x35/0x80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
</TASK>
[...]
==================================================================
Above issue may happen as follows:
-------------------------------------
ext4_fill_super
ext4_orphan_cleanup
--- loop1: assume last_orphan is 12 ---
list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan)
ext4_truncate --> return 0
ext4_inode_attach_jinode --> return -ENOMEM
iput(inode) --> free inode<12>
--- loop2: last_orphan is still 12 ---
list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
// use inode<12> and trigger UAF
To solve this issue, we need to propagate the return value of
ext4_inode_attach_jinode() appropriately.
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20221102080633.1630225-1-libaokun1@huawei.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Diffstat (limited to 'fs/ext4/inode.c')
| -rw-r--r-- | fs/ext4/inode.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index a4bf643aa08b..181bc161b1ac 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4231,7 +4231,8 @@ int ext4_truncate(struct inode *inode) /* If we zero-out tail of the page, we have to create jinode for jbd2 */ if (inode->i_size & (inode->i_sb->s_blocksize - 1)) { - if (ext4_inode_attach_jinode(inode) < 0) + err = ext4_inode_attach_jinode(inode); + if (err) goto out_trace; } |