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authorLinus Torvalds <torvalds@linux-foundation.org>2019-01-05 22:05:06 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2019-01-05 22:05:06 (GMT)
commit7e928df80d30b7664b5822784c95b4a54dc7cfbf (patch)
tree6926184cd629693315c0061bce310db4b9de6165 /fs
parent3cd6d495db2a0acfd2854f43aac8bfc5914bc89c (diff)
parentd5c7076b772ad7dcdb92303397b36aee8fa0d25d (diff)
Merge tag '4.21-smb3-small-fixes' of git://git.samba.org/sfrench/cifs-2.6
Pull smb3 fixes from Steve French: "Three fixes, one for stable, one adds the (most secure) SMB3.1.1 dialect to default list requested" * tag '4.21-smb3-small-fixes' of git://git.samba.org/sfrench/cifs-2.6: smb3: add smb3.1.1 to default dialect list cifs: fix confusing warning message on reconnect smb3: fix large reads on encrypted connections
Diffstat (limited to 'fs')
-rw-r--r--fs/cifs/connect.c2
-rw-r--r--fs/cifs/smb2ops.c4
-rw-r--r--fs/cifs/smb2pdu.c40
-rw-r--r--fs/cifs/smb2pdu.h2
4 files changed, 32 insertions, 16 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 69b9d56..f665296 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -483,7 +483,7 @@ cifs_reconnect(struct TCP_Server_Info *server)
cifs_sb = NULL;
} else {
rc = reconn_setup_dfs_targets(cifs_sb, &tgt_list, &tgt_it);
- if (rc) {
+ if (rc && (rc != -EOPNOTSUPP)) {
cifs_dbg(VFS, "%s: no target servers for DFS failover\n",
__func__);
} else {
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 33100ef..cf7eb89 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -3472,8 +3472,10 @@ smb3_receive_transform(struct TCP_Server_Info *server,
}
/* TODO: add support for compounds containing READ. */
- if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server))
+ if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server)) {
+ *num_mids = 1;
return receive_encrypted_read(server, &mids[0]);
+ }
return receive_encrypted_standard(server, mids, bufs, num_mids);
}
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index e283590..e57f6aa 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -451,10 +451,6 @@ smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
}
-/* offset is sizeof smb2_negotiate_req but rounded up to 8 bytes */
-#define OFFSET_OF_NEG_CONTEXT 0x68 /* sizeof(struct smb2_negotiate_req) */
-
-
#define SMB2_PREAUTH_INTEGRITY_CAPABILITIES cpu_to_le16(1)
#define SMB2_ENCRYPTION_CAPABILITIES cpu_to_le16(2)
#define SMB2_POSIX_EXTENSIONS_AVAILABLE cpu_to_le16(0x100)
@@ -491,10 +487,24 @@ static void
assemble_neg_contexts(struct smb2_negotiate_req *req,
unsigned int *total_len)
{
- char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT;
+ char *pneg_ctxt = (char *)req;
unsigned int ctxt_len;
- *total_len += 2; /* Add 2 due to round to 8 byte boundary for 1st ctxt */
+ if (*total_len > 200) {
+ /* In case length corrupted don't want to overrun smb buffer */
+ cifs_dbg(VFS, "Bad frame length assembling neg contexts\n");
+ return;
+ }
+
+ /*
+ * round up total_len of fixed part of SMB3 negotiate request to 8
+ * byte boundary before adding negotiate contexts
+ */
+ *total_len = roundup(*total_len, 8);
+
+ pneg_ctxt = (*total_len) + (char *)req;
+ req->NegotiateContextOffset = cpu_to_le32(*total_len);
+
build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
*total_len += ctxt_len;
@@ -508,7 +518,6 @@ assemble_neg_contexts(struct smb2_negotiate_req *req,
build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
*total_len += sizeof(struct smb2_posix_neg_context);
- req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
req->NegotiateContextCount = cpu_to_le16(3);
}
@@ -724,8 +733,9 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
- req->DialectCount = cpu_to_le16(3);
- total_len += 6;
+ req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
+ req->DialectCount = cpu_to_le16(4);
+ total_len += 8;
} else {
/* otherwise send specific dialect */
req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
@@ -749,7 +759,9 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
else {
memcpy(req->ClientGUID, server->client_guid,
SMB2_CLIENT_GUID_SIZE);
- if (ses->server->vals->protocol_id == SMB311_PROT_ID)
+ if ((ses->server->vals->protocol_id == SMB311_PROT_ID) ||
+ (strcmp(ses->server->vals->version_string,
+ SMBDEFAULT_VERSION_STRING) == 0))
assemble_neg_contexts(req, &total_len);
}
iov[0].iov_base = (char *)req;
@@ -794,7 +806,8 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
} else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
/* ops set to 3.0 by default for default so update */
ses->server->ops = &smb21_operations;
- }
+ } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
+ ses->server->ops = &smb311_operations;
} else if (le16_to_cpu(rsp->DialectRevision) !=
ses->server->vals->protocol_id) {
/* if requested single dialect ensure returned dialect matched */
@@ -941,13 +954,14 @@ int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
pneg_inbuf->DialectCount = cpu_to_le16(2);
/* structure is big enough for 3 dialects, sending only 2 */
inbuflen = sizeof(*pneg_inbuf) -
- sizeof(pneg_inbuf->Dialects[0]);
+ (2 * sizeof(pneg_inbuf->Dialects[0]));
} else if (strcmp(tcon->ses->server->vals->version_string,
SMBDEFAULT_VERSION_STRING) == 0) {
pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
- pneg_inbuf->DialectCount = cpu_to_le16(3);
+ pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
+ pneg_inbuf->DialectCount = cpu_to_le16(4);
/* structure is big enough for 3 dialects */
inbuflen = sizeof(*pneg_inbuf);
} else {
diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index 05dea67..7a2d0a2 100644
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -898,7 +898,7 @@ struct validate_negotiate_info_req {
__u8 Guid[SMB2_CLIENT_GUID_SIZE];
__le16 SecurityMode;
__le16 DialectCount;
- __le16 Dialects[3]; /* BB expand this if autonegotiate > 3 dialects */
+ __le16 Dialects[4]; /* BB expand this if autonegotiate > 4 dialects */
} __packed;
struct validate_negotiate_info_rsp {

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