[AppArmor 03/45] Add a vfsmount parameter to notify_change()

[jjohansen@suse.de]

[-- Attachment #1: vfs-notify_change.diff --]
[-- Type: text/plain, Size: 12053 bytes --]

The vfsmount parameter must be set appropriately for files visibile
outside the kernel. Files that are only used in a filesystem (e.g.,
reiserfs xattr files) will have a NULL vfsmount.

Signed-off-by: Tony Jones <tonyj@suse.de>
Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
Signed-off-by: John Johansen <jjohansen@suse.de>

---
 fs/attr.c           |    3 ++-
 fs/ecryptfs/inode.c |    4 +++-
 fs/exec.c           |    3 ++-
 fs/fat/file.c       |    2 +-
 fs/hpfs/namei.c     |    2 +-
 fs/namei.c          |    3 ++-
 fs/nfsd/vfs.c       |    8 ++++----
 fs/open.c           |   28 +++++++++++++++-------------
 fs/reiserfs/xattr.c |    6 +++---
 fs/sysfs/file.c     |    2 +-
 fs/utimes.c         |   11 ++++++-----
 include/linux/fs.h  |    6 +++---
 mm/filemap.c        |    2 +-
 mm/tiny-shmem.c     |    2 +-
 14 files changed, 45 insertions(+), 37 deletions(-)

--- a/fs/attr.c
+++ b/fs/attr.c
@@ -100,7 +100,8 @@ int inode_setattr(struct inode * inode, 
 }
 EXPORT_SYMBOL(inode_setattr);
 
-int notify_change(struct dentry * dentry, struct iattr * attr)
+int notify_change(struct dentry *dentry, struct vfsmount *mnt,
+		  struct iattr *attr)
 {
 	struct inode *inode = dentry->d_inode;
 	mode_t mode;
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -870,12 +870,14 @@ static int ecryptfs_setattr(struct dentr
 {
 	int rc = 0;
 	struct dentry *lower_dentry;
+	struct vfsmount *lower_mnt;
 	struct inode *inode;
 	struct inode *lower_inode;
 	struct ecryptfs_crypt_stat *crypt_stat;
 
 	crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 	lower_dentry = ecryptfs_dentry_to_lower(dentry);
+	lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
 	inode = dentry->d_inode;
 	lower_inode = ecryptfs_inode_to_lower(inode);
 	if (ia->ia_valid & ATTR_SIZE) {
@@ -890,7 +892,7 @@ static int ecryptfs_setattr(struct dentr
 		if (rc < 0)
 			goto out;
 	}
-	rc = notify_change(lower_dentry, ia);
+	rc = notify_change(lower_dentry, lower_mnt, ia);
 out:
 	fsstack_copy_attr_all(inode, lower_inode, NULL);
 	return rc;
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1564,7 +1564,8 @@ int do_coredump(long signr, int exit_cod
 		goto close_fail;
 	if (!file->f_op->write)
 		goto close_fail;
-	if (!ispipe && do_truncate(file->f_path.dentry, 0, 0, file) != 0)
+	if (!ispipe &&
+	    do_truncate(file->f_path.dentry, file->f_path.mnt, 0, 0, file) != 0)
 		goto close_fail;
 
 	retval = binfmt->core_dump(signr, regs, file);
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -92,7 +92,7 @@ int fat_generic_ioctl(struct inode *inod
 		}
 
 		/* This MUST be done before doing anything irreversible... */
-		err = notify_change(filp->f_path.dentry, &ia);
+		err = notify_change(filp->f_path.dentry, filp->f_path.mnt, &ia);
 		if (err)
 			goto up;
 
--- a/fs/hpfs/namei.c
+++ b/fs/hpfs/namei.c
@@ -426,7 +426,7 @@ again:
 			/*printk("HPFS: truncating file before delete.\n");*/
 			newattrs.ia_size = 0;
 			newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
-			err = notify_change(dentry, &newattrs);
+			err = notify_change(dentry, NULL, &newattrs);
 			put_write_access(inode);
 			if (!err)
 				goto again;
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1598,7 +1598,8 @@ int may_open(struct nameidata *nd, int a
 		if (!error) {
 			DQUOT_INIT(inode);
 			
-			error = do_truncate(dentry, 0, ATTR_MTIME|ATTR_CTIME, NULL);
+			error = do_truncate(dentry, nd->mnt, 0,
+					    ATTR_MTIME|ATTR_CTIME, NULL);
 		}
 		put_write_access(inode);
 		if (error)
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -358,7 +358,7 @@ nfsd_setattr(struct svc_rqst *rqstp, str
 	err = nfserr_notsync;
 	if (!check_guard || guardtime == inode->i_ctime.tv_sec) {
 		fh_lock(fhp);
-		host_err = notify_change(dentry, iap);
+		host_err = notify_change(dentry, fhp->fh_export->ex_mnt, iap);
 		err = nfserrno(host_err);
 		fh_unlock(fhp);
 	}
@@ -893,13 +893,13 @@ out:
 	return err;
 }
 
-static void kill_suid(struct dentry *dentry)
+static void kill_suid(struct dentry *dentry, struct vfsmount *mnt)
 {
 	struct iattr	ia;
 	ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID;
 
 	mutex_lock(&dentry->d_inode->i_mutex);
-	notify_change(dentry, &ia);
+	notify_change(dentry, mnt, &ia);
 	mutex_unlock(&dentry->d_inode->i_mutex);
 }
 
@@ -958,7 +958,7 @@ nfsd_vfs_write(struct svc_rqst *rqstp, s
 
 	/* clear setuid/setgid flag after write */
 	if (host_err >= 0 && (inode->i_mode & (S_ISUID | S_ISGID)))
-		kill_suid(dentry);
+		kill_suid(dentry, exp->ex_mnt);
 
 	if (host_err >= 0 && stable) {
 		static ino_t	last_ino;
--- a/fs/open.c
+++ b/fs/open.c
@@ -193,8 +193,8 @@ out:
 	return error;
 }
 
-int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
-	struct file *filp)
+int do_truncate(struct dentry *dentry, struct vfsmount *mnt, loff_t length,
+		unsigned int time_attrs, struct file *filp)
 {
 	int err;
 	struct iattr newattrs;
@@ -214,7 +214,7 @@ int do_truncate(struct dentry *dentry, l
 	newattrs.ia_valid |= should_remove_suid(dentry);
 
 	mutex_lock(&dentry->d_inode->i_mutex);
-	err = notify_change(dentry, &newattrs);
+	err = notify_change(dentry, mnt, &newattrs);
 	mutex_unlock(&dentry->d_inode->i_mutex);
 	return err;
 }
@@ -269,7 +269,7 @@ static long do_sys_truncate(const char _
 	error = locks_verify_truncate(inode, NULL, length);
 	if (!error) {
 		DQUOT_INIT(inode);
-		error = do_truncate(nd.dentry, length, 0, NULL);
+		error = do_truncate(nd.dentry, nd.mnt, length, 0, NULL);
 	}
 	put_write_access(inode);
 
@@ -321,7 +321,8 @@ static long do_sys_ftruncate(unsigned in
 
 	error = locks_verify_truncate(inode, file, length);
 	if (!error)
-		error = do_truncate(dentry, length, ATTR_MTIME|ATTR_CTIME, file);
+		error = do_truncate(dentry, file->f_path.mnt, length,
+				    ATTR_MTIME|ATTR_CTIME, file);
 out_putf:
 	fput(file);
 out:
@@ -521,7 +522,7 @@ asmlinkage long sys_fchmod(unsigned int 
 		mode = inode->i_mode;
 	newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
 	newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
-	err = notify_change(dentry, &newattrs);
+	err = notify_change(dentry, file->f_path.mnt, &newattrs);
 	mutex_unlock(&inode->i_mutex);
 
 out_putf:
@@ -556,7 +557,7 @@ asmlinkage long sys_fchmodat(int dfd, co
 		mode = inode->i_mode;
 	newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
 	newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
-	error = notify_change(nd.dentry, &newattrs);
+	error = notify_change(nd.dentry, nd.mnt, &newattrs);
 	mutex_unlock(&inode->i_mutex);
 
 dput_and_out:
@@ -570,7 +571,8 @@ asmlinkage long sys_chmod(const char __u
 	return sys_fchmodat(AT_FDCWD, filename, mode);
 }
 
-static int chown_common(struct dentry * dentry, uid_t user, gid_t group)
+static int chown_common(struct dentry * dentry, struct vfsmount *mnt,
+			uid_t user, gid_t group)
 {
 	struct inode * inode;
 	int error;
@@ -599,7 +601,7 @@ static int chown_common(struct dentry * 
 	if (!S_ISDIR(inode->i_mode))
 		newattrs.ia_valid |= ATTR_KILL_SUID|ATTR_KILL_SGID;
 	mutex_lock(&inode->i_mutex);
-	error = notify_change(dentry, &newattrs);
+	error = notify_change(dentry, mnt, &newattrs);
 	mutex_unlock(&inode->i_mutex);
 out:
 	return error;
@@ -613,7 +615,7 @@ asmlinkage long sys_chown(const char __u
 	error = user_path_walk(filename, &nd);
 	if (error)
 		goto out;
-	error = chown_common(nd.dentry, user, group);
+	error = chown_common(nd.dentry, nd.mnt, user, group);
 	path_release(&nd);
 out:
 	return error;
@@ -633,7 +635,7 @@ asmlinkage long sys_fchownat(int dfd, co
 	error = __user_walk_fd(dfd, filename, follow, &nd);
 	if (error)
 		goto out;
-	error = chown_common(nd.dentry, user, group);
+	error = chown_common(nd.dentry, nd.mnt, user, group);
 	path_release(&nd);
 out:
 	return error;
@@ -647,7 +649,7 @@ asmlinkage long sys_lchown(const char __
 	error = user_path_walk_link(filename, &nd);
 	if (error)
 		goto out;
-	error = chown_common(nd.dentry, user, group);
+	error = chown_common(nd.dentry, nd.mnt, user, group);
 	path_release(&nd);
 out:
 	return error;
@@ -666,7 +668,7 @@ asmlinkage long sys_fchown(unsigned int 
 
 	dentry = file->f_path.dentry;
 	audit_inode(NULL, dentry->d_inode);
-	error = chown_common(dentry, user, group);
+	error = chown_common(dentry, file->f_path.mnt, user, group);
 	fput(file);
 out:
 	return error;
--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -479,7 +479,7 @@ reiserfs_xattr_set(struct inode *inode, 
 	newattrs.ia_size = buffer_size;
 	newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
 	mutex_lock(&xinode->i_mutex);
-	err = notify_change(fp->f_path.dentry, &newattrs);
+	err = notify_change(fp->f_path.dentry, NULL, &newattrs);
 	if (err)
 		goto out_filp;
 
@@ -819,7 +819,7 @@ reiserfs_chown_xattrs_filler(void *buf, 
 	}
 
 	if (!S_ISDIR(xafile->d_inode->i_mode))
-		err = notify_change(xafile, attrs);
+		err = notify_change(xafile, NULL, attrs);
 	dput(xafile);
 
 	return err;
@@ -871,7 +871,7 @@ int reiserfs_chown_xattrs(struct inode *
 		goto out_dir;
 	}
 
-	err = notify_change(dir, attrs);
+	err = notify_change(dir, NULL, attrs);
 	unlock_kernel();
 
       out_dir:
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -554,7 +554,7 @@ int sysfs_chmod_file(struct kobject *kob
 			newattrs.ia_mode = (mode & S_IALLUGO) |
 						(inode->i_mode & ~S_IALLUGO);
 			newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
-			res = notify_change(victim, &newattrs);
+			res = notify_change(victim, NULL, &newattrs);
 			mutex_unlock(&inode->i_mutex);
 		}
 		dput(victim);
--- a/fs/utimes.c
+++ b/fs/utimes.c
@@ -46,7 +46,7 @@ long do_utimes(int dfd, char __user *fil
 {
 	int error;
 	struct nameidata nd;
-	struct dentry *dentry;
+	struct path path;
 	struct inode *inode;
 	struct iattr newattrs;
 	struct file *f = NULL;
@@ -64,16 +64,17 @@ long do_utimes(int dfd, char __user *fil
 		f = fget(dfd);
 		if (!f)
 			goto out;
-		dentry = f->f_path.dentry;
+		path = f->f_path;
 	} else {
 		error = __user_walk_fd(dfd, filename, (flags & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW, &nd);
 		if (error)
 			goto out;
 
-		dentry = nd.dentry;
+		path.dentry = nd.dentry;
+		path.mnt = nd.mnt;
 	}
 
-	inode = dentry->d_inode;
+	inode = path.dentry->d_inode;
 
 	error = -EROFS;
 	if (IS_RDONLY(inode))
@@ -111,7 +112,7 @@ long do_utimes(int dfd, char __user *fil
 			goto dput_and_out;
 	}
 	mutex_lock(&inode->i_mutex);
-	error = notify_change(dentry, &newattrs);
+	error = notify_change(path.dentry, path.mnt, &newattrs);
 	mutex_unlock(&inode->i_mutex);
 dput_and_out:
 	if (f)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1470,8 +1470,8 @@ static inline int break_lease(struct ino
 
 /* fs/open.c */
 
-extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs,
-		       struct file *filp);
+extern int do_truncate(struct dentry *, struct vfsmount *, loff_t start,
+		       unsigned int time_attrs, struct file *filp);
 extern long do_sys_open(int fdf, const char __user *filename, int flags,
 			int mode);
 extern struct file *filp_open(const char *, int, int);
@@ -1624,7 +1624,7 @@ extern int do_remount_sb(struct super_bl
 #ifdef CONFIG_BLOCK
 extern sector_t bmap(struct inode *, sector_t);
 #endif
-extern int notify_change(struct dentry *, struct iattr *);
+extern int notify_change(struct dentry *, struct vfsmount *, struct iattr *);
 extern int permission(struct inode *, int, struct nameidata *);
 extern int generic_permission(struct inode *, int,
 		int (*check_acl)(struct inode *, int));
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1910,7 +1910,7 @@ int __remove_suid(struct path *path, int
 	struct iattr newattrs;
 
 	newattrs.ia_valid = ATTR_FORCE | kill;
-	return notify_change(path->dentry, &newattrs);
+	return notify_change(path->dentry, path->mnt, &newattrs);
 }
 
 int remove_suid(struct path *path)
--- a/mm/tiny-shmem.c
+++ b/mm/tiny-shmem.c
@@ -86,7 +86,7 @@ struct file *shmem_file_setup(char *name
 	file->f_mode = FMODE_WRITE | FMODE_READ;
 
 	/* notify everyone as to the change of file size */
-	error = do_truncate(dentry, size, 0, file);
+	error = do_truncate(dentry, file->f_path.mnt, size, 0, file);
 	if (error < 0)
 		goto close_file;
 

--