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| author | Jaegeuk Kim <jaegeuk@kernel.org> | 2017-04-24 17:00:08 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-05-25 13:44:38 (GMT) |
| commit | 8daed21dbce1d28fd082ef6f2faf8990ccebfd6f (patch) | |
| tree | 3b7ac24183cb28ff4b6f3d11133143761d4dd318 /fs/hpfs/namei.c | |
| parent | b9c0da6219e19901c5bea6e5c19514929dae9e18 (diff) | |
| download | linux-8daed21dbce1d28fd082ef6f2faf8990ccebfd6f.tar.xz | |
f2fs: check entire encrypted bigname when finding a dentry
commit 6332cd32c8290a80e929fc044dc5bdba77396e33 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/hpfs/namei.c')
0 files changed, 0 insertions, 0 deletions