diff options
| author | Rohith Surabattula <rohiths@microsoft.com> | 2020-10-08 11:58:41 +0200 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2020-10-22 00:56:23 +0200 |
| commit | 62593011247c8a8cfeb0c86aff84688b196727c2 (patch) | |
| tree | c4503eb6e1fee404f1bce4a8b793427123c46d24 | |
| parent | cifs: make const array static, makes object smaller (diff) | |
| download | linux-62593011247c8a8cfeb0c86aff84688b196727c2.tar.xz linux-62593011247c8a8cfeb0c86aff84688b196727c2.zip | |
SMB3: Resolve data corruption of TCP server info fields
TCP server info field server->total_read is modified in parallel by
demultiplex thread and decrypt offload worker thread. server->total_read
is used in calculation to discard the remaining data of PDU which is
not read into memory.
Because of parallel modification, server->total_read can get corrupted
and can result in discarding the valid data of next PDU.
Signed-off-by: Rohith Surabattula <rohiths@microsoft.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
CC: Stable <stable@vger.kernel.org> #5.4+
Signed-off-by: Steve French <stfrench@microsoft.com>
| -rw-r--r-- | fs/cifs/smb2ops.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index f085fe32c342..2c3cfb2e8e72 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -4131,7 +4131,8 @@ smb3_is_transform_hdr(void *buf) static int decrypt_raw_data(struct TCP_Server_Info *server, char *buf, unsigned int buf_data_size, struct page **pages, - unsigned int npages, unsigned int page_data_size) + unsigned int npages, unsigned int page_data_size, + bool is_offloaded) { struct kvec iov[2]; struct smb_rqst rqst = {NULL}; @@ -4157,7 +4158,8 @@ decrypt_raw_data(struct TCP_Server_Info *server, char *buf, memmove(buf, iov[1].iov_base, buf_data_size); - server->total_read = buf_data_size + page_data_size; + if (!is_offloaded) + server->total_read = buf_data_size + page_data_size; return rc; } @@ -4370,7 +4372,7 @@ static void smb2_decrypt_offload(struct work_struct *work) struct mid_q_entry *mid; rc = decrypt_raw_data(dw->server, dw->buf, dw->server->vals->read_rsp_size, - dw->ppages, dw->npages, dw->len); + dw->ppages, dw->npages, dw->len, true); if (rc) { cifs_dbg(VFS, "error decrypting rc=%d\n", rc); goto free_pages; @@ -4476,7 +4478,7 @@ receive_encrypted_read(struct TCP_Server_Info *server, struct mid_q_entry **mid, non_offloaded_decrypt: rc = decrypt_raw_data(server, buf, server->vals->read_rsp_size, - pages, npages, len); + pages, npages, len, false); if (rc) goto free_pages; @@ -4532,7 +4534,7 @@ receive_encrypted_standard(struct TCP_Server_Info *server, server->total_read += length; buf_size = pdu_length - sizeof(struct smb2_transform_hdr); - length = decrypt_raw_data(server, buf, buf_size, NULL, 0, 0); + length = decrypt_raw_data(server, buf, buf_size, NULL, 0, 0, false); if (length) return length; |