fix a TODO in _user_mount : added an argsLength parameter

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16480 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/syscalls.h

@@ -127,7 +127,7 @@ extern status_t		_kern_get_next_image_info(team_id team, int32 *cookie, image_in
 
 // VFS functions
 extern dev_t		_kern_mount(const char *path, const char *device,
-						const char *fs_name, uint32 flags, const char *args);
+						const char *fs_name, uint32 flags, const char *args, size_t argsLength);
 extern status_t		_kern_unmount(const char *path, uint32 flags);
 extern status_t		_kern_read_fs_info(dev_t device, struct fs_info *info);
 extern status_t		_kern_write_fs_info(dev_t device, const struct fs_info *info, int mask);

headers/private/kernel/vfs.h

@@ -111,7 +111,7 @@ status_t resolve_mount_point_to_volume_root(mount_id mountID, vnode_id nodeID,
 
 /* calls the syscall dispatcher should use for user file I/O */
 dev_t _user_mount(const char *path, const char *device, const char *fs_name,
-			uint32 flags, const char *args);
+			uint32 flags, const char *args, size_t argsLength);
 status_t _user_unmount(const char *path, uint32 flags);
 status_t _user_read_fs_info(dev_t device, struct fs_info *info);
 status_t _user_write_fs_info(dev_t device, const struct fs_info *info, int mask);

src/system/kernel/fs/vfs.cpp

@@ -5498,7 +5498,7 @@ err:
 
 dev_t
 _kern_mount(const char *path, const char *device, const char *fsName,
-	uint32 flags, const char *args)
+	uint32 flags, const char *args, size_t argsLength)
 {
 	KPath pathBuffer(path, false, B_PATH_NAME_LENGTH + 1);
 	if (pathBuffer.InitCheck() != B_OK)
@@ -6199,7 +6199,7 @@ _kern_setcwd(int fd, const char *path)
 
 dev_t
 _user_mount(const char *userPath, const char *userDevice, const char *userFileSystem,
-	uint32 flags, const char *userArgs)
+	uint32 flags, const char *userArgs, size_t argsLength)
 {
 	char fileSystem[B_OS_NAME_LENGTH];
 	KPath path, device;
@@ -6225,29 +6225,17 @@ _user_mount(const char *userPath, const char *userDevice, const char *userFileSy
 		&& user_strlcpy(device.LockBuffer(), userDevice, B_PATH_NAME_LENGTH) < B_OK)
 		return B_BAD_ADDRESS;
 
-	if (userArgs != NULL) {
-		// We have no real length restriction, so we need to create
-		// a buffer large enough to hold the argument string
-		// ToDo: we could think about determinung the length of the string
-		//	in userland :)
-		ssize_t length = user_strlcpy(args, userArgs, 0);
-		if (length < B_OK)
+	if (userArgs != NULL && argsLength > 0) {
+		if (argsLength >= 65536)
+			return B_BAD_VALUE;
+		args = (char *)malloc(argsLength + 1);
+		if (args == NULL)
+			return B_NO_MEMORY;
+		if (user_strlcpy(args, userArgs, argsLength + 1) < B_OK) {
+			free(args);
 			return B_BAD_ADDRESS;
-
-		// this is a safety restriction
-		if (length > 32 * 1024)
-			return B_NAME_TOO_LONG;
-
-		if (length > 0) {
-			args = (char *)malloc(length + 1);
-			if (args == NULL)
-				return B_NO_MEMORY;
-
-			if (user_strlcpy(args, userArgs, length + 1) < B_OK) {
-				free(args);
-				return B_BAD_ADDRESS;
-			}
 		}
+
 	}
 	path.UnlockBuffer();
 	device.UnlockBuffer();

src/system/kernel/fs/vfs_boot.cpp

@@ -191,7 +191,7 @@ vfs_bootstrap_file_systems(void)
 	status_t status;
 
 	// bootstrap the root filesystem
-	status = _kern_mount("/", NULL, "rootfs", 0, NULL);
+	status = _kern_mount("/", NULL, "rootfs", 0, NULL, 0);
 	if (status < B_OK)
 		panic("error mounting rootfs!\n");
 
@@ -199,13 +199,13 @@ vfs_bootstrap_file_systems(void)
 
 	// bootstrap the devfs
 	_kern_create_dir(-1, "/dev", 0755);
-	status = _kern_mount("/dev", NULL, "devfs", 0, NULL);
+	status = _kern_mount("/dev", NULL, "devfs", 0, NULL, 0);
 	if (status < B_OK)
 		panic("error mounting devfs\n");
 
 	// bootstrap the pipefs
 	_kern_create_dir(-1, "/pipe", 0755);
-	status = _kern_mount("/pipe", NULL, "pipefs", 0, NULL);
+	status = _kern_mount("/pipe", NULL, "pipefs", 0, NULL, 0);
 	if (status < B_OK)
 		panic("error mounting pipefs\n");
 
@@ -240,7 +240,7 @@ vfs_mount_boot_file_system(kernel_args *args)
 		if (bootPartition->GetPath(&path) != B_OK)
 			panic("could not get boot device!\n");
 
-		gBootDevice = _kern_mount("/boot", path.Path(), NULL, 0, NULL);
+		gBootDevice = _kern_mount("/boot", path.Path(), NULL, 0, NULL, 0);
 		if (gBootDevice >= B_OK)
 			break;
 	}

src/system/libroot/os/fs_volume.c

@@ -12,7 +12,7 @@ dev_t
 fs_mount_volume(const char *where, const char *device,
 	const char *fileSystem, uint32 flags, const char *parameters)
 {
-	return _kern_mount(where, device, fileSystem, flags, (void *)parameters);
+	return _kern_mount(where, device, fileSystem, flags, (void *)parameters, parameters ? strlen(parameters) : 0);
 }