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crypto: x86/polyval - Fix crashes when keys are not 16-byte aligned

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crypto_tfm::__crt_ctx is not guaranteed to be 16-byte aligned on x86-64.
This causes crashes due to movaps instructions in clmul_polyval_update.

Add logic to align polyval_tfm_ctx to 16 bytes.

Cc: <stable@vger.kernel.org>
Fixes: 34f7f6c301 ("crypto: x86/polyval - Add PCLMULQDQ accelerated implementation of POLYVAL")
Reported-by: Bruno Goncalves <bgoncalv@redhat.com>
Signed-off-by: Nathan Huckleberry <nhuck@google.com>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Nathan Huckleberry 2022-10-18 16:04:12 -07:00 • committed by Herbert Xu
parent 9abf2313ad
commit 9f6035af06
1 changed files with 14 additions and 5 deletions
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19
arch/x86/crypto/polyval-clmulni_glue.c
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@ -27,13 +27,17 @@
#include <asm/cpu_device_id.h>
#include <asm/simd.h>
#define POLYVAL_ALIGN 16
#define POLYVAL_ALIGN_ATTR __aligned(POLYVAL_ALIGN)
#define POLYVAL_ALIGN_EXTRA ((POLYVAL_ALIGN - 1) & ~(CRYPTO_MINALIGN - 1))
#define POLYVAL_CTX_SIZE (sizeof(struct polyval_tfm_ctx) + POLYVAL_ALIGN_EXTRA)
#define NUM_KEY_POWERS 8
struct polyval_tfm_ctx {
/*
* These powers must be in the order h^8, ..., h^1.
*/
u8 key_powers[NUM_KEY_POWERS][POLYVAL_BLOCK_SIZE];
u8 key_powers[NUM_KEY_POWERS][POLYVAL_BLOCK_SIZE] POLYVAL_ALIGN_ATTR;
};
struct polyval_desc_ctx {
@ -45,6 +49,11 @@ asmlinkage void clmul_polyval_update(const struct polyval_tfm_ctx *keys,
const u8 *in, size_t nblocks, u8 *accumulator);
asmlinkage void clmul_polyval_mul(u8 *op1, const u8 *op2);
static inline struct polyval_tfm_ctx *polyval_tfm_ctx(struct crypto_shash *tfm)
{
return PTR_ALIGN(crypto_shash_ctx(tfm), POLYVAL_ALIGN);
}
static void internal_polyval_update(const struct polyval_tfm_ctx *keys,
const u8 *in, size_t nblocks, u8 *accumulator)
{
@ -72,7 +81,7 @@ static void internal_polyval_mul(u8 *op1, const u8 *op2)
static int polyval_x86_setkey(struct crypto_shash *tfm,
const u8 *key, unsigned int keylen)
{
struct polyval_tfm_ctx *tctx = crypto_shash_ctx(tfm);
struct polyval_tfm_ctx *tctx = polyval_tfm_ctx(tfm);
int i;
if (keylen != POLYVAL_BLOCK_SIZE)
@ -102,7 +111,7 @@ static int polyval_x86_update(struct shash_desc *desc,
const u8 *src, unsigned int srclen)
{
struct polyval_desc_ctx *dctx = shash_desc_ctx(desc);
const struct polyval_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
const struct polyval_tfm_ctx *tctx = polyval_tfm_ctx(desc->tfm);
u8 *pos;
unsigned int nblocks;
unsigned int n;
@ -143,7 +152,7 @@ static int polyval_x86_update(struct shash_desc *desc,
static int polyval_x86_final(struct shash_desc *desc, u8 *dst)
{
struct polyval_desc_ctx *dctx = shash_desc_ctx(desc);
const struct polyval_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
const struct polyval_tfm_ctx *tctx = polyval_tfm_ctx(desc->tfm);
if (dctx->bytes) {
internal_polyval_mul(dctx->buffer,
@ -167,7 +176,7 @@ static struct shash_alg polyval_alg = {
.cra_driver_name = "polyval-clmulni",
.cra_priority = 200,
.cra_blocksize = POLYVAL_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct polyval_tfm_ctx),
.cra_ctxsize = POLYVAL_CTX_SIZE,
.cra_module = THIS_MODULE,
},
};