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Subject[RFC 4/28] Add a vfsmount parameter to notify_change()
Add a vfsmount parameter to notify_change()

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.

The kernel nfsd also doesn't have the necessary context for client
requests. We cannot put it under any pathname based policy, and
also set vfsmount to NULL there.

The next patch passes the vfsmount to the inode_setattr LSM hook.

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

Index: linux-2.6/fs/attr.c
===================================================================
--- linux-2.6.orig/fs/attr.c
+++ linux-2.6/fs/attr.c
@@ -101,7 +101,8 @@ 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;
Index: linux-2.6/include/linux/fs.h
===================================================================
--- linux-2.6.orig/include/linux/fs.h
+++ linux-2.6/include/linux/fs.h
@@ -1457,8 +1457,8 @@ 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);
@@ -1605,7 +1605,7 @@ 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));
Index: linux-2.6/fs/ecryptfs/inode.c
===================================================================
--- linux-2.6.orig/fs/ecryptfs/inode.c
+++ linux-2.6/fs/ecryptfs/inode.c
@@ -856,12 +856,14 @@ 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) {
@@ -876,7 +878,7 @@ 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;
Index: linux-2.6/fs/fat/file.c
===================================================================
--- linux-2.6.orig/fs/fat/file.c
+++ linux-2.6/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;

Index: linux-2.6/fs/hpfs/namei.c
===================================================================
--- linux-2.6.orig/fs/hpfs/namei.c
+++ linux-2.6/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;
Index: linux-2.6/fs/nfsd/vfs.c
===================================================================
--- linux-2.6.orig/fs/nfsd/vfs.c
+++ linux-2.6/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, NULL, iap);
err = nfserrno(host_err);
fh_unlock(fhp);
}
@@ -896,7 +896,7 @@ static void kill_suid(struct dentry *den
ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID;

mutex_lock(&dentry->d_inode->i_mutex);
- notify_change(dentry, &ia);
+ notify_change(dentry, NULL, &ia);
mutex_unlock(&dentry->d_inode->i_mutex);
}

Index: linux-2.6/fs/open.c
===================================================================
--- linux-2.6.orig/fs/open.c
+++ linux-2.6/fs/open.c
@@ -194,8 +194,8 @@ 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;
@@ -212,7 +212,7 @@ int do_truncate(struct dentry *dentry, l
}

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;
}
@@ -267,7 +267,7 @@ 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);

@@ -319,7 +319,8 @@ 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:
@@ -519,7 +520,7 @@ 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:
@@ -554,7 +555,7 @@ 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:
@@ -568,7 +569,8 @@ 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;
@@ -597,7 +599,7 @@ 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;
@@ -611,7 +613,7 @@ 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;
@@ -631,7 +633,7 @@ 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;
@@ -645,7 +647,7 @@ 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;
@@ -664,7 +666,7 @@ 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;
Index: linux-2.6/fs/reiserfs/xattr.c
===================================================================
--- linux-2.6.orig/fs/reiserfs/xattr.c
+++ linux-2.6/fs/reiserfs/xattr.c
@@ -527,7 +527,7 @@ 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;

@@ -867,7 +867,7 @@ 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;
@@ -919,7 +919,7 @@ int reiserfs_chown_xattrs(struct inode *
goto out_dir;
}

- err = notify_change(dir, attrs);
+ err = notify_change(dir, NULL, attrs);
unlock_kernel();

out_dir:
Index: linux-2.6/fs/sysfs/file.c
===================================================================
--- linux-2.6.orig/fs/sysfs/file.c
+++ linux-2.6/fs/sysfs/file.c
@@ -526,7 +526,7 @@ 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);
Index: linux-2.6/fs/utimes.c
===================================================================
--- linux-2.6.orig/fs/utimes.c
+++ linux-2.6/fs/utimes.c
@@ -62,7 +62,7 @@ asmlinkage long sys_utime(char __user *
goto dput_and_out;
}
mutex_lock(&inode->i_mutex);
- error = notify_change(nd.dentry, &newattrs);
+ error = notify_change(nd.dentry, nd.mnt, &newattrs);
mutex_unlock(&inode->i_mutex);
dput_and_out:
path_release(&nd);
@@ -115,7 +115,7 @@ long do_utimes(int dfd, char __user *fil
goto dput_and_out;
}
mutex_lock(&inode->i_mutex);
- error = notify_change(nd.dentry, &newattrs);
+ error = notify_change(nd.dentry, nd.mnt, &newattrs);
mutex_unlock(&inode->i_mutex);
dput_and_out:
path_release(&nd);
Index: linux-2.6/mm/filemap.c
===================================================================
--- linux-2.6.orig/mm/filemap.c
+++ linux-2.6/mm/filemap.c
@@ -1897,7 +1897,7 @@ 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)
Index: linux-2.6/fs/exec.c
===================================================================
--- linux-2.6.orig/fs/exec.c
+++ linux-2.6/fs/exec.c
@@ -1534,7 +1534,8 @@ 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);
Index: linux-2.6/fs/namei.c
===================================================================
--- linux-2.6.orig/fs/namei.c
+++ linux-2.6/fs/namei.c
@@ -1580,7 +1580,8 @@ 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)
Index: linux-2.6/mm/tiny-shmem.c
===================================================================
--- linux-2.6.orig/mm/tiny-shmem.c
+++ linux-2.6/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;

-
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