1 files changed, 62 insertions, 114 deletions

diff --git a/security/tomoyo/mount.c b/security/tomoyo/mount.c
index 9fc2e15841c9..bee09d062057 100644
--- a/security/tomoyo/mount.c
+++ b/security/tomoyo/mount.c
@@ -1,28 +1,22 @@
 /*
  * security/tomoyo/mount.c
  *
- * Copyright (C) 2005-2010  NTT DATA CORPORATION
+ * Copyright (C) 2005-2011  NTT DATA CORPORATION
  */
 
 #include <linux/slab.h>
 #include "common.h"
 
-/* Keywords for mount restrictions. */
-
-/* Allow to call 'mount --bind /source_dir /dest_dir' */
-#define TOMOYO_MOUNT_BIND_KEYWORD                        "--bind"
-/* Allow to call 'mount --move /old_dir    /new_dir ' */
-#define TOMOYO_MOUNT_MOVE_KEYWORD                        "--move"
-/* Allow to call 'mount -o remount /dir             ' */
-#define TOMOYO_MOUNT_REMOUNT_KEYWORD                     "--remount"
-/* Allow to call 'mount --make-unbindable /dir'       */
-#define TOMOYO_MOUNT_MAKE_UNBINDABLE_KEYWORD             "--make-unbindable"
-/* Allow to call 'mount --make-private /dir'          */
-#define TOMOYO_MOUNT_MAKE_PRIVATE_KEYWORD                "--make-private"
-/* Allow to call 'mount --make-slave /dir'            */
-#define TOMOYO_MOUNT_MAKE_SLAVE_KEYWORD                  "--make-slave"
-/* Allow to call 'mount --make-shared /dir'           */
-#define TOMOYO_MOUNT_MAKE_SHARED_KEYWORD                 "--make-shared"
+/* String table for special mount operations. */
+static const char * const tomoyo_mounts[TOMOYO_MAX_SPECIAL_MOUNT] = {
+	[TOMOYO_MOUNT_BIND]            = "--bind",
+	[TOMOYO_MOUNT_MOVE]            = "--move",
+	[TOMOYO_MOUNT_REMOUNT]         = "--remount",
+	[TOMOYO_MOUNT_MAKE_UNBINDABLE] = "--make-unbindable",
+	[TOMOYO_MOUNT_MAKE_PRIVATE]    = "--make-private",
+	[TOMOYO_MOUNT_MAKE_SLAVE]      = "--make-slave",
+	[TOMOYO_MOUNT_MAKE_SHARED]     = "--make-shared",
+};
 
 /**
  * tomoyo_audit_mount_log - Audit mount log.
@@ -33,50 +27,42 @@
  */
 static int tomoyo_audit_mount_log(struct tomoyo_request_info *r)
 {
-	const char *dev = r->param.mount.dev->name;
-	const char *dir = r->param.mount.dir->name;
-	const char *type = r->param.mount.type->name;
-	const unsigned long flags = r->param.mount.flags;
-	if (r->granted)
-		return 0;
-	if (!strcmp(type, TOMOYO_MOUNT_REMOUNT_KEYWORD))
-		tomoyo_warn_log(r, "mount -o remount %s 0x%lX", dir, flags);
-	else if (!strcmp(type, TOMOYO_MOUNT_BIND_KEYWORD)
-		 || !strcmp(type, TOMOYO_MOUNT_MOVE_KEYWORD))
-		tomoyo_warn_log(r, "mount %s %s %s 0x%lX", type, dev, dir,
-				flags);
-	else if (!strcmp(type, TOMOYO_MOUNT_MAKE_UNBINDABLE_KEYWORD) ||
-		 !strcmp(type, TOMOYO_MOUNT_MAKE_PRIVATE_KEYWORD) ||
-		 !strcmp(type, TOMOYO_MOUNT_MAKE_SLAVE_KEYWORD) ||
-		 !strcmp(type, TOMOYO_MOUNT_MAKE_SHARED_KEYWORD))
-		tomoyo_warn_log(r, "mount %s %s 0x%lX", type, dir, flags);
-	else
-		tomoyo_warn_log(r, "mount -t %s %s %s 0x%lX", type, dev, dir,
-				flags);
-	return tomoyo_supervisor(r,
-				 TOMOYO_KEYWORD_ALLOW_MOUNT "%s %s %s 0x%lX\n",
-				 tomoyo_pattern(r->param.mount.dev),
-				 tomoyo_pattern(r->param.mount.dir), type,
-				 flags);
+	return tomoyo_supervisor(r, "file mount %s %s %s 0x%lX\n",
+				 r->param.mount.dev->name,
+				 r->param.mount.dir->name,
+				 r->param.mount.type->name,
+				 r->param.mount.flags);
 }
 
+/**
+ * tomoyo_check_mount_acl - Check permission for path path path number operation.
+ *
+ * @r:   Pointer to "struct tomoyo_request_info".
+ * @ptr: Pointer to "struct tomoyo_acl_info".
+ *
+ * Returns true if granted, false otherwise.
+ */
 static bool tomoyo_check_mount_acl(struct tomoyo_request_info *r,
 				   const struct tomoyo_acl_info *ptr)
 {
 	const struct tomoyo_mount_acl *acl =
 		container_of(ptr, typeof(*acl), head);
-	return tomoyo_compare_number_union(r->param.mount.flags, &acl->flags) &&
-		tomoyo_compare_name_union(r->param.mount.type, &acl->fs_type) &&
-		tomoyo_compare_name_union(r->param.mount.dir, &acl->dir_name) &&
+	return tomoyo_compare_number_union(r->param.mount.flags,
+					   &acl->flags) &&
+		tomoyo_compare_name_union(r->param.mount.type,
+					  &acl->fs_type) &&
+		tomoyo_compare_name_union(r->param.mount.dir,
+					  &acl->dir_name) &&
 		(!r->param.mount.need_dev ||
-		 tomoyo_compare_name_union(r->param.mount.dev, &acl->dev_name));
+		 tomoyo_compare_name_union(r->param.mount.dev,
+					   &acl->dev_name));
 }
 
 /**
  * tomoyo_mount_acl - Check permission for mount() operation.
  *
  * @r:        Pointer to "struct tomoyo_request_info".
- * @dev_name: Name of device file.
+ * @dev_name: Name of device file. Maybe NULL.
  * @dir:      Pointer to "struct path".
  * @type:     Name of filesystem type.
  * @flags:    Mount options.
@@ -86,8 +72,10 @@ static bool tomoyo_check_mount_acl(struct tomoyo_request_info *r,
  * Caller holds tomoyo_read_lock().
  */
 static int tomoyo_mount_acl(struct tomoyo_request_info *r, char *dev_name,
-			    struct path *dir, char *type, unsigned long flags)
+			    struct path *dir, const char *type,
+			    unsigned long flags)
 {
+	struct tomoyo_obj_info obj = { };
 	struct path path;
 	struct file_system_type *fstype = NULL;
 	const char *requested_type = NULL;
@@ -98,6 +86,7 @@ static int tomoyo_mount_acl(struct tomoyo_request_info *r, char *dev_name,
 	struct tomoyo_path_info rdir;
 	int need_dev = 0;
 	int error = -ENOMEM;
+	r->obj = &obj;
 
 	/* Get fstype. */
 	requested_type = tomoyo_encode(type);
@@ -107,6 +96,7 @@ static int tomoyo_mount_acl(struct tomoyo_request_info *r, char *dev_name,
 	tomoyo_fill_path_info(&rtype);
 
 	/* Get mount point. */
+	obj.path2 = *dir;
 	requested_dir_name = tomoyo_realpath_from_path(dir);
 	if (!requested_dir_name) {
 		error = -ENOMEM;
@@ -116,15 +106,15 @@ static int tomoyo_mount_acl(struct tomoyo_request_info *r, char *dev_name,
 	tomoyo_fill_path_info(&rdir);
 
 	/* Compare fs name. */
-	if (!strcmp(type, TOMOYO_MOUNT_REMOUNT_KEYWORD)) {
+	if (type == tomoyo_mounts[TOMOYO_MOUNT_REMOUNT]) {
 		/* dev_name is ignored. */
-	} else if (!strcmp(type, TOMOYO_MOUNT_MAKE_UNBINDABLE_KEYWORD) ||
-		   !strcmp(type, TOMOYO_MOUNT_MAKE_PRIVATE_KEYWORD) ||
-		   !strcmp(type, TOMOYO_MOUNT_MAKE_SLAVE_KEYWORD) ||
-		   !strcmp(type, TOMOYO_MOUNT_MAKE_SHARED_KEYWORD)) {
+	} else if (type == tomoyo_mounts[TOMOYO_MOUNT_MAKE_UNBINDABLE] ||
+		   type == tomoyo_mounts[TOMOYO_MOUNT_MAKE_PRIVATE] ||
+		   type == tomoyo_mounts[TOMOYO_MOUNT_MAKE_SLAVE] ||
+		   type == tomoyo_mounts[TOMOYO_MOUNT_MAKE_SHARED]) {
 		/* dev_name is ignored. */
-	} else if (!strcmp(type, TOMOYO_MOUNT_BIND_KEYWORD) ||
-		   !strcmp(type, TOMOYO_MOUNT_MOVE_KEYWORD)) {
+	} else if (type == tomoyo_mounts[TOMOYO_MOUNT_BIND] ||
+		   type == tomoyo_mounts[TOMOYO_MOUNT_MOVE]) {
 		need_dev = -1; /* dev_name is a directory */
 	} else {
 		fstype = get_fs_type(type);
@@ -142,8 +132,8 @@ static int tomoyo_mount_acl(struct tomoyo_request_info *r, char *dev_name,
 			error = -ENOENT;
 			goto out;
 		}
+		obj.path1 = path;
 		requested_dev_name = tomoyo_realpath_from_path(&path);
-		path_put(&path);
 		if (!requested_dev_name) {
 			error = -ENOENT;
 			goto out;
@@ -176,22 +166,26 @@ static int tomoyo_mount_acl(struct tomoyo_request_info *r, char *dev_name,
 	if (fstype)
 		put_filesystem(fstype);
 	kfree(requested_type);
+	/* Drop refcount obtained by kern_path(). */
+	if (obj.path1.dentry)
+		path_put(&obj.path1);
 	return error;
 }
 
 /**
  * tomoyo_mount_permission - Check permission for mount() operation.
  *
- * @dev_name:  Name of device file.
+ * @dev_name:  Name of device file. Maybe NULL.
  * @path:      Pointer to "struct path".
- * @type:      Name of filesystem type. May be NULL.
+ * @type:      Name of filesystem type. Maybe NULL.
  * @flags:     Mount options.
- * @data_page: Optional data. May be NULL.
+ * @data_page: Optional data. Maybe NULL.
  *
  * Returns 0 on success, negative value otherwise.
  */
-int tomoyo_mount_permission(char *dev_name, struct path *path, char *type,
-			    unsigned long flags, void *data_page)
+int tomoyo_mount_permission(char *dev_name, struct path *path,
+			    const char *type, unsigned long flags,
+			    void *data_page)
 {
 	struct tomoyo_request_info r;
 	int error;
@@ -203,31 +197,31 @@ int tomoyo_mount_permission(char *dev_name, struct path *path, char *type,
 	if ((flags & MS_MGC_MSK) == MS_MGC_VAL)
 		flags &= ~MS_MGC_MSK;
 	if (flags & MS_REMOUNT) {
-		type = TOMOYO_MOUNT_REMOUNT_KEYWORD;
+		type = tomoyo_mounts[TOMOYO_MOUNT_REMOUNT];
 		flags &= ~MS_REMOUNT;
 	}
 	if (flags & MS_MOVE) {
-		type = TOMOYO_MOUNT_MOVE_KEYWORD;
+		type = tomoyo_mounts[TOMOYO_MOUNT_MOVE];
 		flags &= ~MS_MOVE;
 	}
 	if (flags & MS_BIND) {
-		type = TOMOYO_MOUNT_BIND_KEYWORD;
+		type = tomoyo_mounts[TOMOYO_MOUNT_BIND];
 		flags &= ~MS_BIND;
 	}
 	if (flags & MS_UNBINDABLE) {
-		type = TOMOYO_MOUNT_MAKE_UNBINDABLE_KEYWORD;
+		type = tomoyo_mounts[TOMOYO_MOUNT_MAKE_UNBINDABLE];
 		flags &= ~MS_UNBINDABLE;
 	}
 	if (flags & MS_PRIVATE) {
-		type = TOMOYO_MOUNT_MAKE_PRIVATE_KEYWORD;
+		type = tomoyo_mounts[TOMOYO_MOUNT_MAKE_PRIVATE];
 		flags &= ~MS_PRIVATE;
 	}
 	if (flags & MS_SLAVE) {
-		type = TOMOYO_MOUNT_MAKE_SLAVE_KEYWORD;
+		type = tomoyo_mounts[TOMOYO_MOUNT_MAKE_SLAVE];
 		flags &= ~MS_SLAVE;
 	}
 	if (flags & MS_SHARED) {
-		type = TOMOYO_MOUNT_MAKE_SHARED_KEYWORD;
+		type = tomoyo_mounts[TOMOYO_MOUNT_MAKE_SHARED];
 		flags &= ~MS_SHARED;
 	}
 	if (!type)
@@ -237,49 +231,3 @@ int tomoyo_mount_permission(char *dev_name, struct path *path, char *type,
 	tomoyo_read_unlock(idx);
 	return error;
 }
-
-static bool tomoyo_same_mount_acl(const struct tomoyo_acl_info *a,
-				  const struct tomoyo_acl_info *b)
-{
-	const struct tomoyo_mount_acl *p1 = container_of(a, typeof(*p1), head);
-	const struct tomoyo_mount_acl *p2 = container_of(b, typeof(*p2), head);
-	return tomoyo_same_acl_head(&p1->head, &p2->head) &&
-		tomoyo_same_name_union(&p1->dev_name, &p2->dev_name) &&
-		tomoyo_same_name_union(&p1->dir_name, &p2->dir_name) &&
-		tomoyo_same_name_union(&p1->fs_type, &p2->fs_type) &&
-		tomoyo_same_number_union(&p1->flags, &p2->flags);
-}
-
-/**
- * tomoyo_write_mount - Write "struct tomoyo_mount_acl" list.
- *
- * @data:      String to parse.
- * @domain:    Pointer to "struct tomoyo_domain_info".
- * @is_delete: True if it is a delete request.
- *
- * Returns 0 on success, negative value otherwise.
- *
- * Caller holds tomoyo_read_lock().
- */
-int tomoyo_write_mount(char *data, struct tomoyo_domain_info *domain,
-		       const bool is_delete)
-{
-	struct tomoyo_mount_acl e = { .head.type = TOMOYO_TYPE_MOUNT_ACL };
-	int error = is_delete ? -ENOENT : -ENOMEM;
-	char *w[4];
-	if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[3][0])
-		return -EINVAL;
-	if (!tomoyo_parse_name_union(w[0], &e.dev_name) ||
-	    !tomoyo_parse_name_union(w[1], &e.dir_name) ||
-	    !tomoyo_parse_name_union(w[2], &e.fs_type) ||
-	    !tomoyo_parse_number_union(w[3], &e.flags))
-		goto out;
-	error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain,
-				     tomoyo_same_mount_acl, NULL);
- out:
-	tomoyo_put_name_union(&e.dev_name);
-	tomoyo_put_name_union(&e.dir_name);
-	tomoyo_put_name_union(&e.fs_type);
-	tomoyo_put_number_union(&e.flags);
-	return error;
-}