TOMOYO: Remove unneeded parameter.

tomoyo_path_perm() tomoyo_path2_perm() and tomoyo_check_rewrite_permission()
always receive tomoyo_domain(). We can move it from caller to callee.
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>

security/tomoyo/common.h

@@ -637,12 +637,10 @@ int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain,
 			   const struct tomoyo_path_info *filename);
 int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
 				 struct path *path, const int flag);
-int tomoyo_path_perm(struct tomoyo_domain_info *domain, const u8 operation,
-		     struct path *path);
-int tomoyo_path2_perm(struct tomoyo_domain_info *domain, const u8 operation,
-		      struct path *path1, struct path *path2);
-int tomoyo_check_rewrite_permission(struct tomoyo_domain_info *domain,
-				    struct file *filp);
+int tomoyo_path_perm(const u8 operation, struct path *path);
+int tomoyo_path2_perm(const u8 operation, struct path *path1,
+		      struct path *path2);
+int tomoyo_check_rewrite_permission(struct file *filp);
 int tomoyo_find_next_domain(struct linux_binprm *bprm);
 
 /* Run garbage collector. */

security/tomoyo/file.c

@@ -1135,17 +1135,16 @@ int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
 /**
  * tomoyo_path_perm - Check permission for "create", "unlink", "mkdir", "rmdir", "mkfifo", "mksock", "mkblock", "mkchar", "truncate", "symlink", "ioctl", "chmod", "chown", "chgrp", "chroot", "mount" and "unmount".
  *
- * @domain:    Pointer to "struct tomoyo_domain_info".
  * @operation: Type of operation.
  * @path:      Pointer to "struct path".
  *
  * Returns 0 on success, negative value otherwise.
  */
-int tomoyo_path_perm(struct tomoyo_domain_info *domain,
-		     const u8 operation, struct path *path)
+int tomoyo_path_perm(const u8 operation, struct path *path)
 {
 	int error = -ENOMEM;
 	struct tomoyo_path_info *buf;
+	struct tomoyo_domain_info *domain = tomoyo_domain();
 	const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE);
 	const bool is_enforce = (mode == 3);
 	int idx;
@@ -1180,15 +1179,14 @@ int tomoyo_path_perm(struct tomoyo_domain_info *domain,
 /**
  * tomoyo_check_rewrite_permission - Check permission for "rewrite".
  *
- * @domain: Pointer to "struct tomoyo_domain_info".
  * @filp: Pointer to "struct file".
  *
  * Returns 0 on success, negative value otherwise.
  */
-int tomoyo_check_rewrite_permission(struct tomoyo_domain_info *domain,
-				    struct file *filp)
+int tomoyo_check_rewrite_permission(struct file *filp)
 {
 	int error = -ENOMEM;
+	struct tomoyo_domain_info *domain = tomoyo_domain();
 	const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE);
 	const bool is_enforce = (mode == 3);
 	struct tomoyo_path_info *buf;
@@ -1217,19 +1215,18 @@ int tomoyo_check_rewrite_permission(struct tomoyo_domain_info *domain,
 /**
  * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root".
  *
- * @domain:    Pointer to "struct tomoyo_domain_info".
  * @operation: Type of operation.
  * @path1:      Pointer to "struct path".
  * @path2:      Pointer to "struct path".
  *
  * Returns 0 on success, negative value otherwise.
  */
-int tomoyo_path2_perm(struct tomoyo_domain_info * const domain,
-		      const u8 operation, struct path *path1,
+int tomoyo_path2_perm(const u8 operation, struct path *path1,
 		      struct path *path2)
 {
 	int error = -ENOMEM;
 	struct tomoyo_path_info *buf1, *buf2;
+	struct tomoyo_domain_info *domain = tomoyo_domain();
 	const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE);
 	const bool is_enforce = (mode == 3);
 	const char *msg;

security/tomoyo/tomoyo.c

@@ -100,33 +100,33 @@ static int tomoyo_bprm_check_security(struct linux_binprm *bprm)
 static int tomoyo_path_truncate(struct path *path, loff_t length,
 				unsigned int time_attrs)
 {
-	return tomoyo_path_perm(tomoyo_domain(), TOMOYO_TYPE_TRUNCATE, path);
+	return tomoyo_path_perm(TOMOYO_TYPE_TRUNCATE, path);
 }
 
 static int tomoyo_path_unlink(struct path *parent, struct dentry *dentry)
 {
 	struct path path = { parent->mnt, dentry };
-	return tomoyo_path_perm(tomoyo_domain(), TOMOYO_TYPE_UNLINK, &path);
+	return tomoyo_path_perm(TOMOYO_TYPE_UNLINK, &path);
 }
 
 static int tomoyo_path_mkdir(struct path *parent, struct dentry *dentry,
 			     int mode)
 {
 	struct path path = { parent->mnt, dentry };
-	return tomoyo_path_perm(tomoyo_domain(), TOMOYO_TYPE_MKDIR, &path);
+	return tomoyo_path_perm(TOMOYO_TYPE_MKDIR, &path);
 }
 
 static int tomoyo_path_rmdir(struct path *parent, struct dentry *dentry)
 {
 	struct path path = { parent->mnt, dentry };
-	return tomoyo_path_perm(tomoyo_domain(), TOMOYO_TYPE_RMDIR, &path);
+	return tomoyo_path_perm(TOMOYO_TYPE_RMDIR, &path);
 }
 
 static int tomoyo_path_symlink(struct path *parent, struct dentry *dentry,
 			       const char *old_name)
 {
 	struct path path = { parent->mnt, dentry };
-	return tomoyo_path_perm(tomoyo_domain(), TOMOYO_TYPE_SYMLINK, &path);
+	return tomoyo_path_perm(TOMOYO_TYPE_SYMLINK, &path);
 }
 
 static int tomoyo_path_mknod(struct path *parent, struct dentry *dentry,
@@ -149,7 +149,7 @@ static int tomoyo_path_mknod(struct path *parent, struct dentry *dentry,
 		type = TOMOYO_TYPE_MKSOCK;
 		break;
 	}
-	return tomoyo_path_perm(tomoyo_domain(), type, &path);
+	return tomoyo_path_perm(type, &path);
 }
 
 static int tomoyo_path_link(struct dentry *old_dentry, struct path *new_dir,
@@ -157,8 +157,7 @@ static int tomoyo_path_link(struct dentry *old_dentry, struct path *new_dir,
 {
 	struct path path1 = { new_dir->mnt, old_dentry };
 	struct path path2 = { new_dir->mnt, new_dentry };
-	return tomoyo_path2_perm(tomoyo_domain(), TOMOYO_TYPE_LINK, &path1,
-				 &path2);
+	return tomoyo_path2_perm(TOMOYO_TYPE_LINK, &path1, &path2);
 }
 
 static int tomoyo_path_rename(struct path *old_parent,
@@ -168,15 +167,14 @@ static int tomoyo_path_rename(struct path *old_parent,
 {
 	struct path path1 = { old_parent->mnt, old_dentry };
 	struct path path2 = { new_parent->mnt, new_dentry };
-	return tomoyo_path2_perm(tomoyo_domain(), TOMOYO_TYPE_RENAME, &path1,
-				 &path2);
+	return tomoyo_path2_perm(TOMOYO_TYPE_RENAME, &path1, &path2);
 }
 
 static int tomoyo_file_fcntl(struct file *file, unsigned int cmd,
 			     unsigned long arg)
 {
 	if (cmd == F_SETFL && ((arg ^ file->f_flags) & O_APPEND))
-		return tomoyo_check_rewrite_permission(tomoyo_domain(), file);
+		return tomoyo_check_rewrite_permission(file);
 	return 0;
 }
 
@@ -196,50 +194,46 @@ static int tomoyo_dentry_open(struct file *f, const struct cred *cred)
 static int tomoyo_file_ioctl(struct file *file, unsigned int cmd,
 			     unsigned long arg)
 {
-	return tomoyo_path_perm(tomoyo_domain(), TOMOYO_TYPE_IOCTL,
-				&file->f_path);
+	return tomoyo_path_perm(TOMOYO_TYPE_IOCTL, &file->f_path);
 }
 
 static int tomoyo_path_chmod(struct dentry *dentry, struct vfsmount *mnt,
 			     mode_t mode)
 {
 	struct path path = { mnt, dentry };
-	return tomoyo_path_perm(tomoyo_domain(), TOMOYO_TYPE_CHMOD, &path);
+	return tomoyo_path_perm(TOMOYO_TYPE_CHMOD, &path);
 }
 
 static int tomoyo_path_chown(struct path *path, uid_t uid, gid_t gid)
 {
 	int error = 0;
 	if (uid != (uid_t) -1)
-		error = tomoyo_path_perm(tomoyo_domain(), TOMOYO_TYPE_CHOWN,
-					 path);
+		error = tomoyo_path_perm(TOMOYO_TYPE_CHOWN, path);
 	if (!error && gid != (gid_t) -1)
-		error = tomoyo_path_perm(tomoyo_domain(), TOMOYO_TYPE_CHGRP,
-					 path);
+		error = tomoyo_path_perm(TOMOYO_TYPE_CHGRP, path);
 	return error;
 }
 
 static int tomoyo_path_chroot(struct path *path)
 {
-	return tomoyo_path_perm(tomoyo_domain(), TOMOYO_TYPE_CHROOT, path);
+	return tomoyo_path_perm(TOMOYO_TYPE_CHROOT, path);
 }
 
 static int tomoyo_sb_mount(char *dev_name, struct path *path,
 			   char *type, unsigned long flags, void *data)
 {
-	return tomoyo_path_perm(tomoyo_domain(), TOMOYO_TYPE_MOUNT, path);
+	return tomoyo_path_perm(TOMOYO_TYPE_MOUNT, path);
 }
 
 static int tomoyo_sb_umount(struct vfsmount *mnt, int flags)
 {
 	struct path path = { mnt, mnt->mnt_root };
-	return tomoyo_path_perm(tomoyo_domain(), TOMOYO_TYPE_UMOUNT, &path);
+	return tomoyo_path_perm(TOMOYO_TYPE_UMOUNT, &path);
 }
 
 static int tomoyo_sb_pivotroot(struct path *old_path, struct path *new_path)
 {
-	return tomoyo_path2_perm(tomoyo_domain(), TOMOYO_TYPE_PIVOT_ROOT,
-				 new_path, old_path);
+	return tomoyo_path2_perm(TOMOYO_TYPE_PIVOT_ROOT, new_path, old_path);
 }
 
 /*