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| author | Jaegeuk Kim <jaegeuk@kernel.org> | 2017-04-24 10:00:08 -0700 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2017-05-04 11:44:35 -0400 |
| commit | 6332cd32c8290a80e929fc044dc5bdba77396e33 (patch) | |
| tree | 24f76cfe6d3dddfd9aa15189ee6445584f71fee6 /fs/f2fs/inline.c | |
| parent | 413d5a9edbb45eec4dbb1904fe689b561ea5d143 (diff) | |
| download | lwn-6332cd32c8290a80e929fc044dc5bdba77396e33.tar.gz lwn-6332cd32c8290a80e929fc044dc5bdba77396e33.zip | |
f2fs: check entire encrypted bigname when finding a dentry
If user has no key under an encrypted dir, fscrypt gives digested dentries.
Previously, when looking up a dentry, f2fs only checks its hash value with
first 4 bytes of the digested dentry, which didn't handle hash collisions fully.
This patch enhances to check entire dentry bytes likewise ext4.
Eric reported how to reproduce this issue by:
# seq -f "edir/abcdefghijklmnopqrstuvwxyz012345%.0f" 100000 | xargs touch
# find edir -type f | xargs stat -c %i | sort | uniq | wc -l
100000
# sync
# echo 3 > /proc/sys/vm/drop_caches
# keyctl new_session
# find edir -type f | xargs stat -c %i | sort | uniq | wc -l
99999
Cc: <stable@vger.kernel.org>
Reported-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
(fixed f2fs_dentry_hash() to work even when the hash is 0)
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/f2fs/inline.c')
| -rw-r--r-- | fs/f2fs/inline.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c index e32a9e527968..fa729ff6b2f9 100644 --- a/fs/f2fs/inline.c +++ b/fs/f2fs/inline.c @@ -296,7 +296,7 @@ struct f2fs_dir_entry *find_in_inline_dir(struct inode *dir, return NULL; } - namehash = f2fs_dentry_hash(&name); + namehash = f2fs_dentry_hash(&name, fname); inline_dentry = inline_data_addr(ipage); @@ -533,7 +533,7 @@ int f2fs_add_inline_entry(struct inode *dir, const struct qstr *new_name, f2fs_wait_on_page_writeback(ipage, NODE, true); - name_hash = f2fs_dentry_hash(new_name); + name_hash = f2fs_dentry_hash(new_name, NULL); make_dentry_ptr(NULL, &d, (void *)dentry_blk, 2); f2fs_update_dentry(ino, mode, &d, new_name, name_hash, bit_pos); |