diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/s390/crypto/zcrypt_cca_key.h | 20 | ||||
| -rw-r--r-- | drivers/s390/crypto/zcrypt_msgtype6.c | 20 |
2 files changed, 37 insertions, 3 deletions
diff --git a/drivers/s390/crypto/zcrypt_cca_key.h b/drivers/s390/crypto/zcrypt_cca_key.h index 011d61d8a4ae..1752622b95f7 100644 --- a/drivers/s390/crypto/zcrypt_cca_key.h +++ b/drivers/s390/crypto/zcrypt_cca_key.h @@ -99,7 +99,7 @@ struct cca_pvt_ext_CRT_sec { * @mex: pointer to user input data * @p: pointer to memory area for the key * - * Returns the size of the key area or -EFAULT + * Returns the size of the key area or negative errno value. */ static inline int zcrypt_type6_mex_key_en(struct ica_rsa_modexpo *mex, void *p) { @@ -118,6 +118,15 @@ static inline int zcrypt_type6_mex_key_en(struct ica_rsa_modexpo *mex, void *p) unsigned char *temp; int i; + /* + * The inputdatalength was a selection criteria in the dispatching + * function zcrypt_rsa_modexpo(). However, do a plausibility check + * here to make sure the following copy_from_user() can't be utilized + * to compromise the system. + */ + if (WARN_ON_ONCE(mex->inputdatalength > 512)) + return -EINVAL; + memset(key, 0, sizeof(*key)); key->pubHdr = static_pub_hdr; @@ -178,6 +187,15 @@ static inline int zcrypt_type6_crt_key(struct ica_rsa_modexpo_crt *crt, void *p) struct cca_public_sec *pub; int short_len, long_len, pad_len, key_len, size; + /* + * The inputdatalength was a selection criteria in the dispatching + * function zcrypt_rsa_crt(). However, do a plausibility check + * here to make sure the following copy_from_user() can't be utilized + * to compromise the system. + */ + if (WARN_ON_ONCE(crt->inputdatalength > 512)) + return -EINVAL; + memset(key, 0, sizeof(*key)); short_len = (crt->inputdatalength + 1) / 2; diff --git a/drivers/s390/crypto/zcrypt_msgtype6.c b/drivers/s390/crypto/zcrypt_msgtype6.c index 97d4bacbc442..e70ae078c86b 100644 --- a/drivers/s390/crypto/zcrypt_msgtype6.c +++ b/drivers/s390/crypto/zcrypt_msgtype6.c @@ -246,7 +246,7 @@ int speed_idx_ep11(int req_type) * @ap_msg: pointer to AP message * @mex: pointer to user input data * - * Returns 0 on success or -EFAULT. + * Returns 0 on success or negative errno value. */ static int ICAMEX_msg_to_type6MEX_msgX(struct zcrypt_queue *zq, struct ap_message *ap_msg, @@ -272,6 +272,14 @@ static int ICAMEX_msg_to_type6MEX_msgX(struct zcrypt_queue *zq, } __packed * msg = ap_msg->message; int size; + /* + * The inputdatalength was a selection criteria in the dispatching + * function zcrypt_rsa_modexpo(). However, make sure the following + * copy_from_user() never exceeds the allocated buffer space. + */ + if (WARN_ON_ONCE(mex->inputdatalength > PAGE_SIZE)) + return -EINVAL; + /* VUD.ciphertext */ msg->length = mex->inputdatalength + 2; if (copy_from_user(msg->text, mex->inputdata, mex->inputdatalength)) @@ -307,7 +315,7 @@ static int ICAMEX_msg_to_type6MEX_msgX(struct zcrypt_queue *zq, * @ap_msg: pointer to AP message * @crt: pointer to user input data * - * Returns 0 on success or -EFAULT. + * Returns 0 on success or negative errno value. */ static int ICACRT_msg_to_type6CRT_msgX(struct zcrypt_queue *zq, struct ap_message *ap_msg, @@ -334,6 +342,14 @@ static int ICACRT_msg_to_type6CRT_msgX(struct zcrypt_queue *zq, } __packed * msg = ap_msg->message; int size; + /* + * The inputdatalength was a selection criteria in the dispatching + * function zcrypt_rsa_crt(). However, make sure the following + * copy_from_user() never exceeds the allocated buffer space. + */ + if (WARN_ON_ONCE(crt->inputdatalength > PAGE_SIZE)) + return -EINVAL; + /* VUD.ciphertext */ msg->length = crt->inputdatalength + 2; if (copy_from_user(msg->text, crt->inputdata, crt->inputdatalength)) |