On Thu, May 27, 2021 at 04:52:36PM -0700, Eric Biggers wrote:
From: Eric Biggers ebiggers@google.com
When initializing a no-key name, fscrypt_fname_disk_to_usr() sets the minor_hash to 0 if the (major) hash is 0.
This doesn't make sense because 0 is a valid hash code, so we shouldn't ignore the filesystem-provided minor_hash in that case. Fix this by removing the special case for 'hash == 0'.
This is an old bug that appears to have originated when the encryption code in ext4 and f2fs was moved into fs/crypto/. The original ext4 and f2fs code passed the hash by pointer instead of by value. So 'if (hash)' actually made sense then, as it was checking whether a pointer was NULL. But now the hashes are passed by value, and filesystems just pass 0 for any hashes they don't have. There is no need to handle this any differently from the hashes actually being 0.
It is difficult to reproduce this bug, as it only made a difference in the case where a filename's 32-bit major hash happened to be 0. However, it probably had the largest chance of causing problems on ubifs, since ubifs uses minor_hash to do lookups of no-key names, in addition to using it as a readdir cookie. ext4 only uses minor_hash as a readdir cookie, and f2fs doesn't use minor_hash at all.
Fixes: 0b81d0779072 ("fs crypto: move per-file encryption from f2fs tree to fs/crypto") Cc: stable@vger.kernel.org # v4.6+ Signed-off-by: Eric Biggers ebiggers@google.com
fs/crypto/fname.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-)
Applied to fscrypt.git#master for 5.14.
- Eric