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authorIngo Tuchscherer <ingo.tuchscherer@de.ibm.com>2014-03-18 15:30:21 (GMT)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2014-04-01 07:23:34 (GMT)
commitce1ce2f31224c18e84d859ccd5675cbb2728f57a (patch)
treeeebcf330a28c9f39a214443ec575330588c61454 /drivers/s390
parent01d5f3b598b18a5035426c30801adf65822dbd0c (diff)
downloadlinux-ce1ce2f31224c18e84d859ccd5675cbb2728f57a.tar.xz
s390/zcrypt: add length check for aligned data to avoid overflow in msg-type 6
Signed-off-by: Ingo Tuchscherer <ingo.tuchscherer@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/crypto/zcrypt_api.c4
-rw-r--r--drivers/s390/crypto/zcrypt_msgtype6.c18
2 files changed, 18 insertions, 4 deletions
diff --git a/drivers/s390/crypto/zcrypt_api.c b/drivers/s390/crypto/zcrypt_api.c
index 4b824b1..5222ebe 100644
--- a/drivers/s390/crypto/zcrypt_api.c
+++ b/drivers/s390/crypto/zcrypt_api.c
@@ -626,8 +626,8 @@ static long zcrypt_send_ep11_cprb(struct ep11_urb *xcrb)
return -ENOMEM;
if (copy_from_user(ep11_dev_list.targets,
- (struct ep11_target_dev *)xcrb->targets,
- xcrb->targets_num *
+ (struct ep11_target_dev __force __user *)
+ xcrb->targets, xcrb->targets_num *
sizeof(struct ep11_target_dev)))
return -EFAULT;
}
diff --git a/drivers/s390/crypto/zcrypt_msgtype6.c b/drivers/s390/crypto/zcrypt_msgtype6.c
index 0bc91e4..46b324c 100644
--- a/drivers/s390/crypto/zcrypt_msgtype6.c
+++ b/drivers/s390/crypto/zcrypt_msgtype6.c
@@ -315,6 +315,10 @@ static int XCRB_msg_to_type6CPRB_msgX(struct zcrypt_device *zdev,
char *req_data = ap_msg->message + sizeof(struct type6_hdr) + rcblen;
char *function_code;
+ if (CEIL4(xcRB->request_control_blk_length) <
+ xcRB->request_control_blk_length)
+ return -EINVAL; /* overflow after alignment*/
+
/* length checks */
ap_msg->length = sizeof(struct type6_hdr) +
CEIL4(xcRB->request_control_blk_length) +
@@ -333,6 +337,10 @@ static int XCRB_msg_to_type6CPRB_msgX(struct zcrypt_device *zdev,
return -EINVAL;
}
+ if (CEIL4(xcRB->reply_control_blk_length) <
+ xcRB->reply_control_blk_length)
+ return -EINVAL; /* overflow after alignment*/
+
replylen = sizeof(struct type86_fmt2_msg) +
CEIL4(xcRB->reply_control_blk_length) +
xcRB->reply_data_length;
@@ -415,12 +423,18 @@ static int xcrb_msg_to_type6_ep11cprb_msgx(struct zcrypt_device *zdev,
unsigned int dom_val; /* domain id */
} __packed * payload_hdr;
+ if (CEIL4(xcRB->req_len) < xcRB->req_len)
+ return -EINVAL; /* overflow after alignment*/
+
/* length checks */
ap_msg->length = sizeof(struct type6_hdr) + xcRB->req_len;
if (CEIL4(xcRB->req_len) > MSGTYPE06_MAX_MSG_SIZE -
(sizeof(struct type6_hdr)))
return -EINVAL;
+ if (CEIL4(xcRB->resp_len) < xcRB->resp_len)
+ return -EINVAL; /* overflow after alignment*/
+
if (CEIL4(xcRB->resp_len) > MSGTYPE06_MAX_MSG_SIZE -
(sizeof(struct type86_fmt2_msg)))
return -EINVAL;
@@ -432,7 +446,7 @@ static int xcrb_msg_to_type6_ep11cprb_msgx(struct zcrypt_device *zdev,
/* Import CPRB data from the ioctl input parameter */
if (copy_from_user(&(msg->cprbx.cprb_len),
- (char *)xcRB->req, xcRB->req_len)) {
+ (char __force __user *)xcRB->req, xcRB->req_len)) {
return -EFAULT;
}
@@ -645,7 +659,7 @@ static int convert_type86_ep11_xcrb(struct zcrypt_device *zdev,
return -EINVAL;
/* Copy response CPRB to user */
- if (copy_to_user((char *)xcRB->resp,
+ if (copy_to_user((char __force __user *)xcRB->resp,
data + msg->fmt2.offset1, msg->fmt2.count1))
return -EFAULT;
xcRB->resp_len = msg->fmt2.count1;