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path: root/fs/cifs/smb2pdu.c
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Diffstat (limited to 'fs/cifs/smb2pdu.c')
-rw-r--r--fs/cifs/smb2pdu.c114
1 files changed, 70 insertions, 44 deletions
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 0e53265e1462..366f0c3b799b 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -144,7 +144,7 @@ smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
struct TCP_Server_Info *server)
{
int rc = 0;
- struct nls_table *nls_codepage;
+ struct nls_table *nls_codepage = NULL;
struct cifs_ses *ses;
/*
@@ -165,13 +165,9 @@ smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
spin_lock(&tcon->tc_lock);
if (tcon->status == TID_EXITING) {
/*
- * only tree disconnect, open, and write,
- * (and ulogoff which does not have tcon)
- * are allowed as we start force umount.
+ * only tree disconnect allowed when disconnecting ...
*/
- if ((smb2_command != SMB2_WRITE) &&
- (smb2_command != SMB2_CREATE) &&
- (smb2_command != SMB2_TREE_DISCONNECT)) {
+ if (smb2_command != SMB2_TREE_DISCONNECT) {
spin_unlock(&tcon->tc_lock);
cifs_dbg(FYI, "can not send cmd %d while umounting\n",
smb2_command);
@@ -203,6 +199,7 @@ smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
}
spin_unlock(&server->srv_lock);
+again:
rc = cifs_wait_for_server_reconnect(server, tcon->retry);
if (rc)
return rc;
@@ -219,8 +216,7 @@ smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
tcon->ses->chans_need_reconnect,
tcon->need_reconnect);
- nls_codepage = load_nls_default();
-
+ mutex_lock(&ses->session_mutex);
/*
* Recheck after acquire mutex. If another thread is negotiating
* and the server never sends an answer the socket will be closed
@@ -229,28 +225,38 @@ smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
spin_lock(&server->srv_lock);
if (server->tcpStatus == CifsNeedReconnect) {
spin_unlock(&server->srv_lock);
+ mutex_unlock(&ses->session_mutex);
+
+ if (tcon->retry)
+ goto again;
+
rc = -EHOSTDOWN;
goto out;
}
spin_unlock(&server->srv_lock);
+ nls_codepage = load_nls_default();
+
/*
* need to prevent multiple threads trying to simultaneously
* reconnect the same SMB session
*/
+ spin_lock(&ses->ses_lock);
spin_lock(&ses->chan_lock);
- if (!cifs_chan_needs_reconnect(ses, server)) {
+ if (!cifs_chan_needs_reconnect(ses, server) &&
+ ses->ses_status == SES_GOOD) {
spin_unlock(&ses->chan_lock);
-
+ spin_unlock(&ses->ses_lock);
/* this means that we only need to tree connect */
if (tcon->need_reconnect)
goto skip_sess_setup;
+ mutex_unlock(&ses->session_mutex);
goto out;
}
spin_unlock(&ses->chan_lock);
+ spin_unlock(&ses->ses_lock);
- mutex_lock(&ses->session_mutex);
rc = cifs_negotiate_protocol(0, ses, server);
if (!rc) {
rc = cifs_setup_session(0, ses, server, nls_codepage);
@@ -266,10 +272,8 @@ smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
mutex_unlock(&ses->session_mutex);
goto out;
}
- mutex_unlock(&ses->session_mutex);
skip_sess_setup:
- mutex_lock(&ses->session_mutex);
if (!tcon->need_reconnect) {
mutex_unlock(&ses->session_mutex);
goto out;
@@ -284,7 +288,7 @@ skip_sess_setup:
cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
if (rc) {
/* If sess reconnected but tcon didn't, something strange ... */
- pr_warn_once("reconnect tcon failed rc = %d\n", rc);
+ cifs_dbg(VFS, "reconnect tcon failed rc = %d\n", rc);
goto out;
}
@@ -306,7 +310,6 @@ out:
case SMB2_READ:
case SMB2_WRITE:
case SMB2_LOCK:
- case SMB2_IOCTL:
case SMB2_QUERY_DIRECTORY:
case SMB2_CHANGE_NOTIFY:
case SMB2_QUERY_INFO:
@@ -584,11 +587,15 @@ assemble_neg_contexts(struct smb2_negotiate_req *req,
}
+/* If invalid preauth context warn but use what we requested, SHA-512 */
static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
{
unsigned int len = le16_to_cpu(ctxt->DataLength);
- /* If invalid preauth context warn but use what we requested, SHA-512 */
+ /*
+ * Caller checked that DataLength remains within SMB boundary. We still
+ * need to confirm that one HashAlgorithms member is accounted for.
+ */
if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
pr_warn_once("server sent bad preauth context\n");
return;
@@ -607,7 +614,11 @@ static void decode_compress_ctx(struct TCP_Server_Info *server,
{
unsigned int len = le16_to_cpu(ctxt->DataLength);
- /* sizeof compress context is a one element compression capbility struct */
+ /*
+ * Caller checked that DataLength remains within SMB boundary. We still
+ * need to confirm that one CompressionAlgorithms member is accounted
+ * for.
+ */
if (len < 10) {
pr_warn_once("server sent bad compression cntxt\n");
return;
@@ -629,6 +640,11 @@ static int decode_encrypt_ctx(struct TCP_Server_Info *server,
unsigned int len = le16_to_cpu(ctxt->DataLength);
cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
+ /*
+ * Caller checked that DataLength remains within SMB boundary. We still
+ * need to confirm that one Cipher flexible array member is accounted
+ * for.
+ */
if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
pr_warn_once("server sent bad crypto ctxt len\n");
return -EINVAL;
@@ -675,6 +691,11 @@ static void decode_signing_ctx(struct TCP_Server_Info *server,
{
unsigned int len = le16_to_cpu(pctxt->DataLength);
+ /*
+ * Caller checked that DataLength remains within SMB boundary. We still
+ * need to confirm that one SigningAlgorithms flexible array member is
+ * accounted for.
+ */
if ((len < 4) || (len > 16)) {
pr_warn_once("server sent bad signing negcontext\n");
return;
@@ -716,14 +737,19 @@ static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
for (i = 0; i < ctxt_cnt; i++) {
int clen;
/* check that offset is not beyond end of SMB */
- if (len_of_ctxts == 0)
- break;
-
if (len_of_ctxts < sizeof(struct smb2_neg_context))
break;
pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
- clen = le16_to_cpu(pctx->DataLength);
+ clen = sizeof(struct smb2_neg_context)
+ + le16_to_cpu(pctx->DataLength);
+ /*
+ * 2.2.4 SMB2 NEGOTIATE Response
+ * Subsequent negotiate contexts MUST appear at the first 8-byte
+ * aligned offset following the previous negotiate context.
+ */
+ if (i + 1 != ctxt_cnt)
+ clen = ALIGN(clen, 8);
if (clen > len_of_ctxts)
break;
@@ -744,12 +770,10 @@ static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
else
cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
le16_to_cpu(pctx->ContextType));
-
if (rc)
break;
- /* offsets must be 8 byte aligned */
- clen = ALIGN(clen, 8);
- offset += clen + sizeof(struct smb2_neg_context);
+
+ offset += clen;
len_of_ctxts -= clen;
}
return rc;
@@ -1256,9 +1280,9 @@ SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
if (rc)
return rc;
- spin_lock(&ses->chan_lock);
- is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
- spin_unlock(&ses->chan_lock);
+ spin_lock(&ses->ses_lock);
+ is_binding = (ses->ses_status == SES_GOOD);
+ spin_unlock(&ses->ses_lock);
if (is_binding) {
req->hdr.SessionId = cpu_to_le64(ses->Suid);
@@ -1416,9 +1440,9 @@ SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
goto out_put_spnego_key;
}
- spin_lock(&ses->chan_lock);
- is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
- spin_unlock(&ses->chan_lock);
+ spin_lock(&ses->ses_lock);
+ is_binding = (ses->ses_status == SES_GOOD);
+ spin_unlock(&ses->ses_lock);
/* keep session key if binding */
if (!is_binding) {
@@ -1542,9 +1566,9 @@ SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
- spin_lock(&ses->chan_lock);
- is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
- spin_unlock(&ses->chan_lock);
+ spin_lock(&ses->ses_lock);
+ is_binding = (ses->ses_status == SES_GOOD);
+ spin_unlock(&ses->ses_lock);
/* keep existing ses id and flags if binding */
if (!is_binding) {
@@ -1610,9 +1634,9 @@ SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
- spin_lock(&ses->chan_lock);
- is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
- spin_unlock(&ses->chan_lock);
+ spin_lock(&ses->ses_lock);
+ is_binding = (ses->ses_status == SES_GOOD);
+ spin_unlock(&ses->ses_lock);
/* keep existing ses id and flags if binding */
if (!is_binding) {
@@ -2705,7 +2729,7 @@ int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
rqst.rq_nvec = n_iov;
/* no need to inc num_remote_opens because we close it just below */
- trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
+ trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, full_path, CREATE_NOT_FILE,
FILE_WRITE_ATTRIBUTES);
/* resource #4: response buffer */
rc = cifs_send_recv(xid, ses, server,
@@ -2973,7 +2997,7 @@ SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
if (rc)
goto creat_exit;
- trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
+ trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid, oparms->path,
oparms->create_options, oparms->desired_access);
rc = cifs_send_recv(xid, ses, server,
@@ -4156,10 +4180,12 @@ smb2_readv_callback(struct mid_q_entry *mid)
struct smb2_hdr *shdr =
(struct smb2_hdr *)rdata->iov[0].iov_base;
struct cifs_credits credits = { .value = 0, .instance = 0 };
- struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
- .rq_nvec = 1,
- .rq_iter = rdata->iter,
- .rq_iter_size = iov_iter_count(&rdata->iter), };
+ struct smb_rqst rqst = { .rq_iov = &rdata->iov[1], .rq_nvec = 1 };
+
+ if (rdata->got_bytes) {
+ rqst.rq_iter = rdata->iter;
+ rqst.rq_iter_size = iov_iter_count(&rdata->iter);
+ };
WARN_ONCE(rdata->server != mid->server,
"rdata server %p != mid server %p",
generated by cgit v1.2.3 (git 2.39.0) at 2024-08-18 12:05:14 +0300