This is used for SMB3 encryption and compounded requests.
The first rqst begins with a smb3 transform header as the first iov.
Signed-off-by: Ronnie Sahlberg <lsahlber@xxxxxxxxxx>
---
fs/cifs/smb2ops.c | 46 ++++++++++++++++++++++++++++++----------------
1 file changed, 30 insertions(+), 16 deletions(-)
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 23ff4cf3ac88..dd49354a35af 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -2077,29 +2077,42 @@ fill_transform_hdr(struct smb2_transform_hdr *tr_hdr, unsigned int orig_len,
* rqst->rq_iov[1+] data to be encrypted/decrypted
*/
static struct scatterlist *
-init_sg(struct smb_rqst *rqst, u8 *sign)
+init_sg(int num_rqst, struct smb_rqst *rqst, u8 *sign)
{
unsigned int sg_len = rqst->rq_nvec + rqst->rq_npages + 1;
unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 20;
struct scatterlist *sg;
unsigned int i;
unsigned int j;
+ unsigned int idx = 0;
sg = kmalloc_array(sg_len, sizeof(struct scatterlist), GFP_KERNEL);
if (!sg)
return NULL;
sg_init_table(sg, sg_len);
- sg_set_buf(&sg[0], rqst->rq_iov[0].iov_base + 20, assoc_data_len);
- for (i = 1; i < rqst->rq_nvec; i++)
- sg_set_buf(&sg[i], rqst->rq_iov[i].iov_base,
- rqst->rq_iov[i].iov_len);
- for (j = 0; i < sg_len - 1; i++, j++) {
- unsigned int len = (j < rqst->rq_npages - 1) ? rqst->rq_pagesz
- : rqst->rq_tailsz;
- sg_set_page(&sg[i], rqst->rq_pages[j], len, 0);
- }
- sg_set_buf(&sg[sg_len - 1], sign, SMB2_SIGNATURE_SIZE);
+ for (i = 0; i < num_rqst; i++) {
+ /* the first rqst has a transform header where the first 20
+ * bytes are not part of the encrypted blob
+ */
+ if (i == 0)
+ sg_set_buf(&sg[idx++], rqst[i].rq_iov[i].iov_base + 20,
+ assoc_data_len);
+ else
+ sg_set_buf(&sg[idx++], rqst[i].rq_iov[i].iov_base,
+ rqst[i].rq_iov[0].iov_len);
+
+ for (j = 1; j < rqst[i].rq_nvec; j++)
+ sg_set_buf(&sg[idx++], rqst[i].rq_iov[j].iov_base,
+ rqst[i].rq_iov[j].iov_len);
+
+ for (j = 0; j < rqst[i].rq_npages; j++) {
+ unsigned int len = (j < rqst[i].rq_npages - 1) ?
+ rqst[i].rq_pagesz : rqst[i].rq_tailsz;
+ sg_set_page(&sg[idx++], rqst[i].rq_pages[j], len, 0);
+ }
+ }
+ sg_set_buf(&sg[idx], sign, SMB2_SIGNATURE_SIZE);
return sg;
}
@@ -2131,7 +2144,8 @@ smb2_get_enc_key(struct TCP_Server_Info *server, __u64 ses_id, int enc, u8 *key)
* untouched.
*/
static int
-crypt_message(struct TCP_Server_Info *server, struct smb_rqst *rqst, int enc)
+crypt_message(struct TCP_Server_Info *server, int num_rqst,
+ struct smb_rqst *rqst, int enc)
{
struct smb2_transform_hdr *tr_hdr =
(struct smb2_transform_hdr *)rqst->rq_iov[0].iov_base;
@@ -2185,7 +2199,7 @@ crypt_message(struct TCP_Server_Info *server, struct smb_rqst *rqst, int enc)
crypt_len += SMB2_SIGNATURE_SIZE;
}
- sg = init_sg(rqst, sign);
+ sg = init_sg(num_rqst, rqst, sign);
if (!sg) {
cifs_dbg(VFS, "%s: Failed to init sg", __func__);
rc = -ENOMEM;
@@ -2269,7 +2283,7 @@ smb3_init_transform_rq(struct TCP_Server_Info *server, int num_rqst,
new_rq->rq_iov = iov;
new_rq->rq_nvec = old_rq->rq_nvec + 1;
- /* fill the 2nd iov with a transform header */
+ /* fill the 1st iov with a transform header */
fill_transform_hdr(tr_hdr, orig_len, old_rq);
new_rq->rq_iov[0].iov_base = tr_hdr;
new_rq->rq_iov[0].iov_len = sizeof(struct smb2_transform_hdr);
@@ -2285,7 +2299,7 @@ smb3_init_transform_rq(struct TCP_Server_Info *server, int num_rqst,
kunmap(old_rq->rq_pages[i]);
}
- rc = crypt_message(server, new_rq, 1);
+ rc = crypt_message(server, num_rqst, new_rq, 1);
cifs_dbg(FYI, "encrypt message returned %d", rc);
if (rc)
goto err_free_iov;
@@ -2349,7 +2363,7 @@ decrypt_raw_data(struct TCP_Server_Info *server, char *buf,
rqst.rq_pagesz = PAGE_SIZE;
rqst.rq_tailsz = (page_data_size % PAGE_SIZE) ? : PAGE_SIZE;
- rc = crypt_message(server, &rqst, 0);
+ rc = crypt_message(server, 1, &rqst, 0);
cifs_dbg(FYI, "decrypt message returned %d\n", rc);
if (rc)
--
2.13.3
--
To unsubscribe from this list: send the line "unsubscribe linux-cifs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
