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| author | Kees Cook <keescook@chromium.org> | 2018-08-07 23:18:39 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2018-09-14 08:08:52 +0200 |
| commit | 6d39a1241ebc3bdd61d654c3058f0955c28c13fd (patch) | |
| tree | 96bb0af93ed1392637ac6dc974a55f36f0572d80 /drivers/md/dm-verity-fec.c | |
| parent | crypto: arm/chacha20 - faster 8-bit rotations and other optimizations (diff) | |
| download | linux-6d39a1241ebc3bdd61d654c3058f0955c28c13fd.tar.xz linux-6d39a1241ebc3bdd61d654c3058f0955c28c13fd.zip | |
dm: Remove VLA usage from hashes
In the quest to remove all stack VLA usage from the kernel[1], this uses
the new HASH_MAX_DIGESTSIZE from the crypto layer to allocate the upper
bounds on stack usage.
[1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to '')
| -rw-r--r-- | drivers/md/dm-verity-fec.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/md/dm-verity-fec.c b/drivers/md/dm-verity-fec.c index 684af08d0747..0ce04e5b4afb 100644 --- a/drivers/md/dm-verity-fec.c +++ b/drivers/md/dm-verity-fec.c @@ -212,12 +212,15 @@ static int fec_read_bufs(struct dm_verity *v, struct dm_verity_io *io, struct dm_verity_fec_io *fio = fec_io(io); u64 block, ileaved; u8 *bbuf, *rs_block; - u8 want_digest[v->digest_size]; + u8 want_digest[HASH_MAX_DIGESTSIZE]; unsigned n, k; if (neras) *neras = 0; + if (WARN_ON(v->digest_size > sizeof(want_digest))) + return -EINVAL; + /* * read each of the rsn data blocks that are part of the RS block, and * interleave contents to available bufs |