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crypto: arm64/chacha - correctly walk through blocks

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Prior, passing in chunks of 2, 3, or 4, followed by any additional
chunks would result in the chacha state counter getting out of sync,
resulting in incorrect encryption/decryption, which is a pretty nasty
crypto vuln: "why do images look weird on webpages?" WireGuard users
never experienced this prior, because we have always, out of tree, used
a different crypto library, until the recent Frankenzinc addition. This
commit fixes the issue by advancing the pointers and state counter by
the actual size processed. It also fixes up a bug in the (optional,
costly) stride test that prevented it from running on arm64.

Fixes: b3aad5bad2 ("crypto: arm64/chacha - expose arm64 ChaCha routine as library function")
Reported-and-tested-by: Emil Renner Berthing <kernel@esmil.dk>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: stable@vger.kernel.org # v5.5+
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Jason A. Donenfeld 2020-03-18 20:27:32 -06:00 committed by Herbert Xu
parent 1579f1bc3b
commit c8cfcb78c6
2 changed files with 12 additions and 7 deletions
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8
arch/arm64/crypto/chacha-neon-glue.c
View File

@ -55,10 +55,10 @@ static void chacha_doneon(u32 *state, u8 *dst, const u8 *src,
break;
}
chacha_4block_xor_neon(state, dst, src, nrounds, l);
bytes -= CHACHA_BLOCK_SIZE * 5;
src += CHACHA_BLOCK_SIZE * 5;
dst += CHACHA_BLOCK_SIZE * 5;
state[12] += 5;
bytes -= l;
src += l;
dst += l;
state[12] += DIV_ROUND_UP(l, CHACHA_BLOCK_SIZE);
}
}

11
lib/crypto/chacha20poly1305-selftest.c
View File

@ -9028,10 +9028,15 @@ bool __init chacha20poly1305_selftest(void)
&& total_len <= 1 << 10; ++total_len) {
for (i = 0; i <= total_len; ++i) {
for (j = i; j <= total_len; ++j) {
k = 0;
sg_init_table(sg_src, 3);
sg_set_buf(&sg_src[0], input, i);
sg_set_buf(&sg_src[1], input + i, j - i);
sg_set_buf(&sg_src[2], input + j, total_len - j);
if (i)
sg_set_buf(&sg_src[k++], input, i);
if (j - i)
sg_set_buf(&sg_src[k++], input + i, j - i);
if (total_len - j)
sg_set_buf(&sg_src[k++], input + j, total_len - j);
sg_init_marker(sg_src, k);
memset(computed_output, 0, total_len);
memset(input, 0, total_len);