Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6:
  [CIFS] Turn off Unicode during session establishment for plaintext authentication
  [CIFS] update cifs change log
  cifs: fix O_APPEND on directio mounts
  [CIFS] Fix plaintext authentication

5 files changed, 23 insertions, 3 deletions

diff --git a/fs/cifs/CHANGES b/fs/cifs/CHANGES
index f9e4ad9..06e521a 100644
--- a/fs/cifs/CHANGES
+++ b/fs/cifs/CHANGES
@@ -9,7 +9,10 @@ files (e.g. "cp -a") to Windows servers.  For mkdir and create honor setgid bit
 on parent directory when server supports Unix Extensions but not POSIX
 create. Update cifs.upcall version to handle new Kerberos sec flags
 (this requires update of cifs.upcall program from Samba).  Fix memory leak
-on dns_upcall (resolving DFS referralls).
+on dns_upcall (resolving DFS referralls).  Fix plain text password
+authentication (requires setting SecurityFlags to 0x30030 to enable
+lanman and plain text though).  Fix writes to be at correct offset when
+file is open with O_APPEND and file is on a directio (forcediretio) mount.
 
 Version 1.53
 ------------
diff --git a/fs/cifs/README b/fs/cifs/README
index 68b5c11..bd2343d 100644
--- a/fs/cifs/README
+++ b/fs/cifs/README
@@ -542,10 +542,20 @@ SecurityFlags		Flags which control security negotiation and
 			hashing mechanisms (as "must use") on the other hand 
 			does not make much sense. Default flags are 
 				0x07007 
-			(NTLM, NTLMv2 and packet signing allowed).  Maximum 
+			(NTLM, NTLMv2 and packet signing allowed).  The maximum 
 			allowable flags if you want to allow mounts to servers
 			using weaker password hashes is 0x37037 (lanman,
-			plaintext, ntlm, ntlmv2, signing allowed):
+			plaintext, ntlm, ntlmv2, signing allowed).  Some
+			SecurityFlags require the corresponding menuconfig
+			options to be enabled (lanman and plaintext require
+			CONFIG_CIFS_WEAK_PW_HASH for example).  Enabling
+			plaintext authentication currently requires also
+			enabling lanman authentication in the security flags
+			because the cifs module only supports sending
+			laintext passwords using the older lanman dialect
+			form of the session setup SMB.  (e.g. for authentication
+			using plain text passwords, set the SecurityFlags
+			to 0x30030):
  
 			may use packet signing 				0x00001
 			must use packet signing				0x01001
diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c
index 83fd40d..bd5f13d 100644
--- a/fs/cifs/cifsencrypt.c
+++ b/fs/cifs/cifsencrypt.c
@@ -294,6 +294,7 @@ void calc_lanman_hash(struct cifsSesInfo *ses, char *lnm_session_key)
 
 	if ((ses->server->secMode & SECMODE_PW_ENCRYPT) == 0)
 		if (extended_security & CIFSSEC_MAY_PLNTXT) {
+			memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE);
 			memcpy(lnm_session_key, password_with_pad,
 				CIFS_ENCPWD_SIZE);
 			return;
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index ff14d14..cbefe1f 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -833,6 +833,10 @@ ssize_t cifs_user_write(struct file *file, const char __user *write_data,
 		return -EBADF;
 	open_file = (struct cifsFileInfo *) file->private_data;
 
+	rc = generic_write_checks(file, poffset, &write_size, 0);
+	if (rc)
+		return rc;
+
 	xid = GetXid();
 
 	if (*poffset > file->f_path.dentry->d_inode->i_size)
diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
index b537fad..252fdc0 100644
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -409,6 +409,8 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time,
 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 		char lnm_session_key[CIFS_SESS_KEY_SIZE];
 
+		pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
+
 		/* no capabilities flags in old lanman negotiation */
 
 		pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);