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| author | Sami Tolvanen <samitolvanen@google.com> | 2016-06-03 14:06:14 -0700 |
|---|---|---|
| committer | Mister Oyster <oysterized@gmail.com> | 2017-12-27 18:52:57 +0100 |
| commit | db47a048b07221f1487666279e63a19888fb5055 (patch) | |
| tree | 2bbbad5fa6b8c81b057596c9f2afadf4eb3811a2 /kernel | |
| parent | 6a8f35e28e82acb7d1b0a35876b7a3067d93d304 (diff) | |
ANDROID: dm verity fec: limit error correction recursion
If verity tree itself is sufficiently corrupted in addition to data
blocks, it's possible for error correction to end up in a deep recursive
error correction loop that eventually causes a kernel panic as follows:
[ 14.728962] [<ffffffc0008c1a14>] verity_fec_decode+0xa8/0x138
[ 14.734691] [<ffffffc0008c3ee0>] verity_verify_level+0x11c/0x180
[ 14.740681] [<ffffffc0008c482c>] verity_hash_for_block+0x88/0xe0
[ 14.746671] [<ffffffc0008c1508>] fec_decode_rsb+0x318/0x75c
[ 14.752226] [<ffffffc0008c1a14>] verity_fec_decode+0xa8/0x138
[ 14.757956] [<ffffffc0008c3ee0>] verity_verify_level+0x11c/0x180
[ 14.763944] [<ffffffc0008c482c>] verity_hash_for_block+0x88/0xe0
This change limits the recursion to a reasonable level during a single
I/O operation.
Bug: 28943429
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Change-Id: I0a7ebff331d259c59a5e03c81918cc1613c3a766
(cherry picked from commit f4b9e40597e73942d2286a73463c55f26f61bfa7)
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions