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crypto: bcm - convert to use crypto_authenc_extractkeys()

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Convert the bcm crypto driver to use crypto_authenc_extractkeys() so
that it picks up the fix for broken validation of rtattr::rta_len.

This also fixes the DES weak key check to actually be done on the right
key. (It was checking the authentication key, not the encryption key...)

Fixes: 9d12ba86f8 ("crypto: brcm - Add Broadcom SPU driver")
Cc: <stable@vger.kernel.org> # v4.11+
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2018-12-16 23:23:23 -08:00 committed by Herbert Xu
parent 8f9c469348
commit ab57b33525
2 changed files with 14 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/crypto/Kconfig
View File

@ -692,6 +692,7 @@ config CRYPTO_DEV_BCM_SPU
depends on ARCH_BCM_IPROC
depends on MAILBOX
default m
select CRYPTO_AUTHENC
select CRYPTO_DES
select CRYPTO_MD5
select CRYPTO_SHA1

44
drivers/crypto/bcm/cipher.c
View File

@ -2845,44 +2845,28 @@ static int aead_authenc_setkey(struct crypto_aead *cipher,
struct spu_hw *spu = &iproc_priv.spu;
struct iproc_ctx_s *ctx = crypto_aead_ctx(cipher);
struct crypto_tfm *tfm = crypto_aead_tfm(cipher);
struct rtattr *rta = (void *)key;
struct crypto_authenc_key_param *param;
const u8 *origkey = key;
const unsigned int origkeylen = keylen;
int ret = 0;
struct crypto_authenc_keys keys;
int ret;
flow_log("%s() aead:%p key:%p keylen:%u\n", __func__, cipher, key,
keylen);
flow_dump(" key: ", key, keylen);
if (!RTA_OK(rta, keylen))
goto badkey;
if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM)
goto badkey;
if (RTA_PAYLOAD(rta) < sizeof(*param))
ret = crypto_authenc_extractkeys(&keys, key, keylen);
if (ret)
goto badkey;
param = RTA_DATA(rta);
ctx->enckeylen = be32_to_cpu(param->enckeylen);
key += RTA_ALIGN(rta->rta_len);
keylen -= RTA_ALIGN(rta->rta_len);
if (keylen < ctx->enckeylen)
goto badkey;
if (ctx->enckeylen > MAX_KEY_SIZE)
if (keys.enckeylen > MAX_KEY_SIZE ||
keys.authkeylen > MAX_KEY_SIZE)
goto badkey;
ctx->authkeylen = keylen - ctx->enckeylen;
ctx->enckeylen = keys.enckeylen;
ctx->authkeylen = keys.authkeylen;
if (ctx->authkeylen > MAX_KEY_SIZE)
goto badkey;
memcpy(ctx->enckey, key + ctx->authkeylen, ctx->enckeylen);
memcpy(ctx->enckey, keys.enckey, keys.enckeylen);
/* May end up padding auth key. So make sure it's zeroed. */
memset(ctx->authkey, 0, sizeof(ctx->authkey));
memcpy(ctx->authkey, key, ctx->authkeylen);
memcpy(ctx->authkey, keys.authkey, keys.authkeylen);
switch (ctx->alg->cipher_info.alg) {
case CIPHER_ALG_DES:
@ -2890,7 +2874,7 @@ static int aead_authenc_setkey(struct crypto_aead *cipher,
u32 tmp[DES_EXPKEY_WORDS];
u32 flags = CRYPTO_TFM_RES_WEAK_KEY;
if (des_ekey(tmp, key) == 0) {
if (des_ekey(tmp, keys.enckey) == 0) {
if (crypto_aead_get_flags(cipher) &
CRYPTO_TFM_REQ_WEAK_KEY) {
crypto_aead_set_flags(cipher, flags);
@ -2905,7 +2889,7 @@ static int aead_authenc_setkey(struct crypto_aead *cipher,
break;
case CIPHER_ALG_3DES:
if (ctx->enckeylen == (DES_KEY_SIZE * 3)) {
const u32 *K = (const u32 *)key;
const u32 *K = (const u32 *)keys.enckey;
u32 flags = CRYPTO_TFM_RES_BAD_KEY_SCHED;
if (!((K[0] ^ K[2]) | (K[1] ^ K[3])) ||
@ -2956,9 +2940,7 @@ static int aead_authenc_setkey(struct crypto_aead *cipher,
ctx->fallback_cipher->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
ctx->fallback_cipher->base.crt_flags |=
tfm->crt_flags & CRYPTO_TFM_REQ_MASK;
ret =
crypto_aead_setkey(ctx->fallback_cipher, origkey,
origkeylen);
ret = crypto_aead_setkey(ctx->fallback_cipher, key, keylen);
if (ret) {
flow_log(" fallback setkey() returned:%d\n", ret);
tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;