diff options
author | Ye Bin <yebin10@huawei.com> | 2022-12-06 22:41:34 +0800 |
---|---|---|
committer | Theodore Ts'o <tytso@mit.edu> | 2022-12-08 21:49:25 -0500 |
commit | 5c099c4fdc438014d5893629e70a8ba934433ee8 (patch) | |
tree | 5c95d0212cf1d3bbc4049838385daef1c1c654dd /fs | |
parent | d73eff68a8c0ea3fc626b08ea84e4cd327ccbe5f (diff) | |
download | linux-stable-5c099c4fdc438014d5893629e70a8ba934433ee8.tar.gz linux-stable-5c099c4fdc438014d5893629e70a8ba934433ee8.tar.bz2 linux-stable-5c099c4fdc438014d5893629e70a8ba934433ee8.zip |
ext4: fix kernel BUG in 'ext4_write_inline_data_end()'
Syzbot report follow issue:
------------[ cut here ]------------
kernel BUG at fs/ext4/inline.c:227!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 3629 Comm: syz-executor212 Not tainted 6.1.0-rc5-syzkaller-00018-g59d0d52c30d4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:ext4_write_inline_data+0x344/0x3e0 fs/ext4/inline.c:227
RSP: 0018:ffffc90003b3f368 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff8880704e16c0 RCX: 0000000000000000
RDX: ffff888021763a80 RSI: ffffffff821e31a4 RDI: 0000000000000006
RBP: 000000000006818e R08: 0000000000000006 R09: 0000000000068199
R10: 0000000000000079 R11: 0000000000000000 R12: 000000000000000b
R13: 0000000000068199 R14: ffffc90003b3f408 R15: ffff8880704e1c82
FS: 000055555723e3c0(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffe8ac9080 CR3: 0000000079f81000 CR4: 0000000000350ee0
Call Trace:
<TASK>
ext4_write_inline_data_end+0x2a3/0x12f0 fs/ext4/inline.c:768
ext4_write_end+0x242/0xdd0 fs/ext4/inode.c:1313
ext4_da_write_end+0x3ed/0xa30 fs/ext4/inode.c:3063
generic_perform_write+0x316/0x570 mm/filemap.c:3764
ext4_buffered_write_iter+0x15b/0x460 fs/ext4/file.c:285
ext4_file_write_iter+0x8bc/0x16e0 fs/ext4/file.c:700
call_write_iter include/linux/fs.h:2191 [inline]
do_iter_readv_writev+0x20b/0x3b0 fs/read_write.c:735
do_iter_write+0x182/0x700 fs/read_write.c:861
vfs_iter_write+0x74/0xa0 fs/read_write.c:902
iter_file_splice_write+0x745/0xc90 fs/splice.c:686
do_splice_from fs/splice.c:764 [inline]
direct_splice_actor+0x114/0x180 fs/splice.c:931
splice_direct_to_actor+0x335/0x8a0 fs/splice.c:886
do_splice_direct+0x1ab/0x280 fs/splice.c:974
do_sendfile+0xb19/0x1270 fs/read_write.c:1255
__do_sys_sendfile64 fs/read_write.c:1323 [inline]
__se_sys_sendfile64 fs/read_write.c:1309 [inline]
__x64_sys_sendfile64+0x1d0/0x210 fs/read_write.c:1309
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
---[ end trace 0000000000000000 ]---
Above issue may happens as follows:
ext4_da_write_begin
ext4_da_write_inline_data_begin
ext4_da_convert_inline_data_to_extent
ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
ext4_da_write_end
ext4_run_li_request
ext4_mb_prefetch
ext4_read_block_bitmap_nowait
ext4_validate_block_bitmap
ext4_mark_group_bitmap_corrupted(sb, block_group, EXT4_GROUP_INFO_BBITMAP_CORRUPT)
percpu_counter_sub(&sbi->s_freeclusters_counter,grp->bb_free);
-> sbi->s_freeclusters_counter become zero
ext4_da_write_begin
if (ext4_nonda_switch(inode->i_sb)) -> As freeclusters_counter is zero will return true
*fsdata = (void *)FALL_BACK_TO_NONDELALLOC;
ext4_write_begin
ext4_da_write_end
if (write_mode == FALL_BACK_TO_NONDELALLOC)
ext4_write_end
if (inline_data)
ext4_write_inline_data_end
ext4_write_inline_data
BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
-> As inode is already convert to extent, so 'pos + len' > inline_size
-> then trigger BUG.
To solve this issue, instead of checking ext4_has_inline_data() which
is only cleared after data has been written back, check the
EXT4_STATE_MAY_INLINE_DATA flag in ext4_write_end().
Fixes: f19d5870cbf7 ("ext4: add normal write support for inline data")
Reported-by: syzbot+4faa160fa96bfba639f8@syzkaller.appspotmail.com
Reported-by: Jun Nie <jun.nie@linaro.org>
Signed-off-by: Ye Bin <yebin10@huawei.com>
Link: https://lore.kernel.org/r/20221206144134.1919987-1-yebin@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Diffstat (limited to 'fs')
-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 181bc161b1ac..a0f4d4197a0b 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -1315,7 +1315,8 @@ static int ext4_write_end(struct file *file, trace_ext4_write_end(inode, pos, len, copied); - if (ext4_has_inline_data(inode)) + if (ext4_has_inline_data(inode) && + ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) return ext4_write_inline_data_end(inode, pos, len, copied, page); copied = block_write_end(file, mapping, pos, len, copied, page, fsdata); |