diff options
author | Eric Biggers <ebiggers@google.com> | 2016-11-13 20:41:09 -0500 |
---|---|---|
committer | Theodore Ts'o <tytso@mit.edu> | 2016-11-19 20:56:13 -0500 |
commit | 0f0909e242f73c1154272cf04f07fc9afe13e5b8 (patch) | |
tree | ff64e7ce77a05f3cfebe72b2f2706bf5f2101e88 /Documentation | |
parent | 3c7018ebf8dbf14e7cd4f5dc648c51fc979f45bb (diff) |
fscrypto: don't use on-stack buffer for key derivation
With the new (in 4.9) option to use a virtually-mapped stack
(CONFIG_VMAP_STACK), stack buffers cannot be used as input/output for
the scatterlist crypto API because they may not be directly mappable to
struct page. get_crypt_info() was using a stack buffer to hold the
output from the encryption operation used to derive the per-file key.
Fix it by using a heap buffer.
This bug could most easily be observed in a CONFIG_DEBUG_SG kernel
because this allowed the BUG in sg_set_buf() to be triggered.
Cc: stable@vger.kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'Documentation')
0 files changed, 0 insertions, 0 deletions