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author | Kees Cook <keescook@chromium.org> | 2018-08-07 14:18:38 -0700 |
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committer | Herbert Xu <herbert@gondor.apana.org.au> | 2018-09-04 11:35:03 +0800 |
commit | 063bb34a20467b3225c6629f8a15784bbd72fb19 (patch) | |
tree | fd8736c39b8dbb2be5c6ff269c2dcd6922b06af0 /crypto/rng.c | |
parent | 8e77538b76d8fdb7593f2d38022c8f3a1792934d (diff) | |
download | linux-crypto-063bb34a20467b3225c6629f8a15784bbd72fb19.tar.gz linux-crypto-063bb34a20467b3225c6629f8a15784bbd72fb19.zip |
crypto: hash - Remove VLA usage
In the quest to remove all stack VLA usage from the kernel[1], this
removes the VLAs in SHASH_DESC_ON_STACK (via crypto_shash_descsize())
by using the maximum allowable size (which is now more clearly captured
in a macro), along with a few other cases. Similar limits are turned into
macros as well.
A review of existing sizes shows that SHA512_DIGEST_SIZE (64) is the
largest digest size and that sizeof(struct sha3_state) (360) is the
largest descriptor size. The corresponding maximums are reduced.
[1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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