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Message-Id: <20180717042150.37761-9-keescook@chromium.org>
Date: Mon, 16 Jul 2018 21:21:47 -0700
From: Kees Cook <keescook@...omium.org>
To: Herbert Xu <herbert@...dor.apana.org.au>
Cc: Kees Cook <keescook@...omium.org>, Arnd Bergmann <arnd@...db.de>,
Eric Biggers <ebiggers@...gle.com>,
"Gustavo A. R. Silva" <gustavo@...eddedor.com>,
Alasdair Kergon <agk@...hat.com>,
Giovanni Cabiddu <giovanni.cabiddu@...el.com>,
Lars Persson <larper@...s.com>,
Mike Snitzer <snitzer@...hat.com>,
Rabin Vincent <rabinv@...s.com>,
Tim Chen <tim.c.chen@...ux.intel.com>,
linux-crypto@...r.kernel.org, qat-linux@...el.com,
dm-devel@...hat.com, linux-kernel@...r.kernel.org
Subject: [PATCH v5 08/11] crypto: qat: Remove VLA usage
In the quest to remove all stack VLA usage from the kernel[1], this uses
the new upper bound for the stack buffer. Also adds a sanity check.
[1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com
Signed-off-by: Kees Cook <keescook@...omium.org>
---
drivers/crypto/qat/qat_common/qat_algs.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/crypto/qat/qat_common/qat_algs.c b/drivers/crypto/qat/qat_common/qat_algs.c
index 1138e41d6805..a28edf7b792f 100644
--- a/drivers/crypto/qat/qat_common/qat_algs.c
+++ b/drivers/crypto/qat/qat_common/qat_algs.c
@@ -153,8 +153,8 @@ static int qat_alg_do_precomputes(struct icp_qat_hw_auth_algo_blk *hash,
struct sha512_state sha512;
int block_size = crypto_shash_blocksize(ctx->hash_tfm);
int digest_size = crypto_shash_digestsize(ctx->hash_tfm);
- char ipad[block_size];
- char opad[block_size];
+ char ipad[MAX_ALGAPI_BLOCKSIZE];
+ char opad[MAX_ALGAPI_BLOCKSIZE];
__be32 *hash_state_out;
__be64 *hash512_state_out;
int i, offset;
@@ -164,6 +164,10 @@ static int qat_alg_do_precomputes(struct icp_qat_hw_auth_algo_blk *hash,
shash->tfm = ctx->hash_tfm;
shash->flags = 0x0;
+ if (WARN_ON(block_size > sizeof(ipad) ||
+ sizeof(ipad) != sizeof(opad)))
+ return -EINVAL;
+
if (auth_keylen > block_size) {
int ret = crypto_shash_digest(shash, auth_key,
auth_keylen, ipad);
--
2.17.1
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