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crypto: lib/blake2s - reduce stack frame usage in self test

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commit d6c14da474 upstream.

Using 3 blocks here doesn't give us much more than using 2, and it
causes a stack frame size warning on certain compiler/config/arch
combinations:

   lib/crypto/blake2s-selftest.c: In function 'blake2s_selftest':
>> lib/crypto/blake2s-selftest.c:632:1: warning: the frame size of 1088 bytes is larger than 1024 bytes [-Wframe-larger-than=]
     632 | }
         | ^

So this patch just reduces the block from 3 to 2, which makes the
warning go away.

Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/linux-crypto/202206200851.gE3MHCgd-lkp@intel.com
Fixes: 2d16803c56 ("crypto: blake2s - remove shash module")
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jason A. Donenfeld 2022-06-20 09:52:43 +02:00 • committed by Justin Hammond
parent 7c99a9b118
commit 489589c175
1 changed files with 39 additions and 0 deletions
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39
lib/crypto/blake2s-selftest.c
View file

@ -587,5 +587,44 @@ bool __init blake2s_selftest(void)
}
}
for (i = 0; i < 32; ++i) {
enum { TEST_ALIGNMENT = 16 };
u8 unaligned_block[BLAKE2S_BLOCK_SIZE + TEST_ALIGNMENT - 1]
__aligned(TEST_ALIGNMENT);
u8 blocks[BLAKE2S_BLOCK_SIZE * 2];
struct blake2s_state state1, state2;
get_random_bytes(blocks, sizeof(blocks));
get_random_bytes(&state, sizeof(state));
#if defined(CONFIG_CRYPTO_LIB_BLAKE2S_GENERIC) && \
defined(CONFIG_CRYPTO_ARCH_HAVE_LIB_BLAKE2S)
memcpy(&state1, &state, sizeof(state1));
memcpy(&state2, &state, sizeof(state2));
blake2s_compress(&state1, blocks, 2, BLAKE2S_BLOCK_SIZE);
blake2s_compress_generic(&state2, blocks, 2, BLAKE2S_BLOCK_SIZE);
if (memcmp(&state1, &state2, sizeof(state1))) {
pr_err("blake2s random compress self-test %d: FAIL\n",
i + 1);
success = false;
}
#endif
memcpy(&state1, &state, sizeof(state1));
blake2s_compress(&state1, blocks, 1, BLAKE2S_BLOCK_SIZE);
for (l = 1; l < TEST_ALIGNMENT; ++l) {
memcpy(unaligned_block + l, blocks,
BLAKE2S_BLOCK_SIZE);
memcpy(&state2, &state, sizeof(state2));
blake2s_compress(&state2, unaligned_block + l, 1,
BLAKE2S_BLOCK_SIZE);
if (memcmp(&state1, &state2, sizeof(state1))) {
pr_err("blake2s random compress align %d self-test %d: FAIL\n",
l, i + 1);
success = false;
}
}
}
return success;
}