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author | Chao Yu <yuchao0@huawei.com> | 2019-04-15 10:28:34 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-06-15 12:52:56 +0300 |
commit | 549161250f22ce1e71148aaa9eced2d3fc3c8635 (patch) | |
tree | c26a9baa4a9c85d4a6cd7cb8f8e7aafc4c3012db | |
parent | d6fa38f7c326d651aa40b0f92373722c8f5ff159 (diff) | |
download | linux-549161250f22ce1e71148aaa9eced2d3fc3c8635.tar.xz |
f2fs: fix to avoid panic in f2fs_remove_inode_page()
[ Upstream commit 8b6810f8acfe429fde7c7dad4714692cc5f75651 ]
As Jungyeon reported in bugzilla:
https://bugzilla.kernel.org/show_bug.cgi?id=203219
- Overview
When mounting the attached crafted image and running program, I got this error.
Additionally, it hangs on sync after running the program.
The image is intentionally fuzzed from a normal f2fs image for testing and I enabled option CONFIG_F2FS_CHECK_FS on.
- Reproduces
cc poc_06.c
mkdir test
mount -t f2fs tmp.img test
cp a.out test
cd test
sudo ./a.out
sync
- Messages
kernel BUG at fs/f2fs/node.c:1183!
RIP: 0010:f2fs_remove_inode_page+0x294/0x2d0
Call Trace:
f2fs_evict_inode+0x2a3/0x3a0
evict+0xba/0x180
__dentry_kill+0xbe/0x160
dentry_kill+0x46/0x180
dput+0xbb/0x100
do_renameat2+0x3c9/0x550
__x64_sys_rename+0x17/0x20
do_syscall_64+0x43/0xf0
entry_SYSCALL_64_after_hwframe+0x44/0xa9
The reason is f2fs_remove_inode_page() will trigger kernel panic due to
inconsistent i_blocks value of inode.
To avoid panic, let's just print debug message and set SBI_NEED_FSCK to
give a hint to fsck for latter repairing of potential image corruption.
Signed-off-by: Chao Yu <yuchao0@huawei.com>
[Jaegeuk Kim: fix build warning and add unlikely]
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
-rw-r--r-- | fs/f2fs/node.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c index 3f99ab288695..d45ecef75116 100644 --- a/fs/f2fs/node.c +++ b/fs/f2fs/node.c @@ -1179,8 +1179,14 @@ int f2fs_remove_inode_page(struct inode *inode) f2fs_put_dnode(&dn); return -EIO; } - f2fs_bug_on(F2FS_I_SB(inode), - inode->i_blocks != 0 && inode->i_blocks != 8); + + if (unlikely(inode->i_blocks != 0 && inode->i_blocks != 8)) { + f2fs_msg(F2FS_I_SB(inode)->sb, KERN_WARNING, + "Inconsistent i_blocks, ino:%lu, iblocks:%llu", + inode->i_ino, + (unsigned long long)inode->i_blocks); + set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK); + } /* will put inode & node pages */ err = truncate_node(&dn); |