ocfs2: Allow binary names in the DLM

The OCFS2 DLM uses strlen() to determine lock name length, which excludes
the possibility of putting binary values in the name string. Fix this by
requiring that string length be passed in as a parameter.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

5 files changed, 11 insertions, 8 deletions

diff --git a/fs/ocfs2/dlm/dlmapi.h b/fs/ocfs2/dlm/dlmapi.h
index 53652f51c0e..cfd5cb65cab 100644
--- a/fs/ocfs2/dlm/dlmapi.h
+++ b/fs/ocfs2/dlm/dlmapi.h
@@ -182,6 +182,7 @@ enum dlm_status dlmlock(struct dlm_ctxt *dlm,
 			struct dlm_lockstatus *lksb,
 			int flags,
 			const char *name,
+			int namelen,
 			dlm_astlockfunc_t *ast,
 			void *data,
 			dlm_bastlockfunc_t *bast);
diff --git a/fs/ocfs2/dlm/dlmcommon.h b/fs/ocfs2/dlm/dlmcommon.h
index 14530ee7e11..fa968180b07 100644
--- a/fs/ocfs2/dlm/dlmcommon.h
+++ b/fs/ocfs2/dlm/dlmcommon.h
@@ -747,6 +747,7 @@ void dlm_change_lockres_owner(struct dlm_ctxt *dlm,
 			      u8 owner);
 struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm,
 						 const char *lockid,
+						 int namelen,
 						 int flags);
 struct dlm_lock_resource *dlm_new_lockres(struct dlm_ctxt *dlm,
 					  const char *name,
diff --git a/fs/ocfs2/dlm/dlmlock.c b/fs/ocfs2/dlm/dlmlock.c
index 5ca57ec650c..42a1b91979b 100644
--- a/fs/ocfs2/dlm/dlmlock.c
+++ b/fs/ocfs2/dlm/dlmlock.c
@@ -540,8 +540,8 @@ static inline void dlm_get_next_cookie(u8 node_num, u64 *cookie)
 
 enum dlm_status dlmlock(struct dlm_ctxt *dlm, int mode,
 			struct dlm_lockstatus *lksb, int flags,
-			const char *name, dlm_astlockfunc_t *ast, void *data,
-			dlm_bastlockfunc_t *bast)
+			const char *name, int namelen, dlm_astlockfunc_t *ast,
+			void *data, dlm_bastlockfunc_t *bast)
 {
 	enum dlm_status status;
 	struct dlm_lock_resource *res = NULL;
@@ -571,7 +571,7 @@ enum dlm_status dlmlock(struct dlm_ctxt *dlm, int mode,
 	recovery = (flags & LKM_RECOVERY);
 
 	if (recovery &&
-	    (!dlm_is_recovery_lock(name, strlen(name)) || convert) ) {
+	    (!dlm_is_recovery_lock(name, namelen) || convert) ) {
 		dlm_error(status);
 		goto error;
 	}
@@ -643,7 +643,7 @@ retry_convert:
 		}
 
 		status = DLM_IVBUFLEN;
-		if (strlen(name) > DLM_LOCKID_NAME_MAX || strlen(name) < 1) {
+		if (namelen > DLM_LOCKID_NAME_MAX || namelen < 1) {
 			dlm_error(status);
 			goto error;
 		}
@@ -659,7 +659,7 @@ retry_convert:
 			dlm_wait_for_recovery(dlm);
 
 		/* find or create the lock resource */
-		res = dlm_get_lock_resource(dlm, name, flags);
+		res = dlm_get_lock_resource(dlm, name, namelen, flags);
 		if (!res) {
 			status = DLM_IVLOCKID;
 			dlm_error(status);
diff --git a/fs/ocfs2/dlm/dlmmaster.c b/fs/ocfs2/dlm/dlmmaster.c
index 9503240ef0e..f784177b624 100644
--- a/fs/ocfs2/dlm/dlmmaster.c
+++ b/fs/ocfs2/dlm/dlmmaster.c
@@ -740,6 +740,7 @@ struct dlm_lock_resource *dlm_new_lockres(struct dlm_ctxt *dlm,
  */
 struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm,
 					  const char *lockid,
+					  int namelen,
 					  int flags)
 {
 	struct dlm_lock_resource *tmpres=NULL, *res=NULL;
@@ -748,13 +749,12 @@ struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm,
 	int blocked = 0;
 	int ret, nodenum;
 	struct dlm_node_iter iter;
-	unsigned int namelen, hash;
+	unsigned int hash;
 	int tries = 0;
 	int bit, wait_on_recovery = 0;
 
 	BUG_ON(!lockid);
 
-	namelen = strlen(lockid);
 	hash = dlm_lockid_hash(lockid, namelen);
 
 	mlog(0, "get lockres %s (len %d)\n", lockid, namelen);
diff --git a/fs/ocfs2/dlm/dlmrecovery.c b/fs/ocfs2/dlm/dlmrecovery.c
index 594745fab0b..9d950d7cea3 100644
--- a/fs/ocfs2/dlm/dlmrecovery.c
+++ b/fs/ocfs2/dlm/dlmrecovery.c
@@ -2285,7 +2285,8 @@ again:
 	memset(&lksb, 0, sizeof(lksb));
 
 	ret = dlmlock(dlm, LKM_EXMODE, &lksb, LKM_NOQUEUE|LKM_RECOVERY,
-		      DLM_RECOVERY_LOCK_NAME, dlm_reco_ast, dlm, dlm_reco_bast);
+		      DLM_RECOVERY_LOCK_NAME, DLM_RECOVERY_LOCK_NAME_LEN,
+		      dlm_reco_ast, dlm, dlm_reco_bast);
 
 	mlog(0, "%s: dlmlock($RECOVERY) returned %d, lksb=%d\n",
 	     dlm->name, ret, lksb.status);