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crypto: api - Introduce generic max blocksize and alignmask

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In the quest to remove all stack VLA usage from the kernel[1], this
exposes a new general upper bound on crypto blocksize and alignmask
(higher than for the existing cipher limits) for VLA removal,
and introduces new checks.

At present, the highest cra_alignmask in the kernel is 63. The highest
cra_blocksize is 144 (SHA3_224_BLOCK_SIZE, 18 8-byte words). For the
new blocksize limit, I went with 160 (20 8-byte words).

[1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com

Change-Id: Icee27c45f542a9de25310b193c5bd08bc236996e
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Git-Repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Git-Commit: a9f7f88a12f1494deca1fd9e173c7ae886d14f91
Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org>
This commit is contained in:
Kees Cook
2018-08-07 14:18:40 -07:00
committed by Rishabh Bhatnagar
parent 3f66393f50
commit 69aafa11ff
2 changed files with 9 additions and 2 deletions
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4
include/crypto/algapi.h
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@@ -20,8 +20,10 @@
/*
* Maximum values for blocksize and alignmask, used to allocate
* static buffers that are big enough for any combination of
* ciphers and architectures.
* algs and architectures. Ciphers have a lower maximum size.
*/
#define MAX_ALGAPI_BLOCKSIZE 160
#define MAX_ALGAPI_ALIGNMASK 63
#define MAX_CIPHER_BLOCKSIZE 16
#define MAX_CIPHER_ALIGNMASK 15