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fs: port ->fileattr_set() to pass mnt_idmap

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Convert to struct mnt_idmap.

Last cycle we merged the necessary infrastructure in
256c8aed2b ("fs: introduce dedicated idmap type for mounts").
This is just the conversion to struct mnt_idmap.

Currently we still pass around the plain namespace that was attached to a
mount. This is in general pretty convenient but it makes it easy to
conflate namespaces that are relevant on the filesystem with namespaces
that are relevent on the mount level. Especially for non-vfs developers
without detailed knowledge in this area this can be a potential source for
bugs.

Once the conversion to struct mnt_idmap is done all helpers down to the
really low-level helpers will take a struct mnt_idmap argument instead of
two namespace arguments. This way it becomes impossible to conflate the two
eliminating the possibility of any bugs. All of the vfs and all filesystems
only operate on struct mnt_idmap.

Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2023-01-13 12:49:21 +01:00 committed by Christian Brauner (Microsoft)
parent 13e83a4923
commit 8782a9aea3
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
37 changed files with 47 additions and 46 deletions
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2
Documentation/filesystems/locking.rst
View File

@ -81,7 +81,7 @@ prototypes::
umode_t create_mode);
int (*tmpfile) (struct mnt_idmap *, struct inode *,
struct file *, umode_t);
int (*fileattr_set)(struct user_namespace *mnt_userns,
int (*fileattr_set)(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa);
int (*fileattr_get)(struct dentry *dentry, struct fileattr *fa);
struct posix_acl * (*get_acl)(struct mnt_idmap *, struct dentry *, int);

2
Documentation/filesystems/vfs.rst
View File

@ -445,7 +445,7 @@ As of kernel 2.6.22, the following members are defined:
int (*tmpfile) (struct mnt_idmap *, struct inode *, struct file *, umode_t);
struct posix_acl * (*get_acl)(struct mnt_idmap *, struct dentry *, int);
int (*set_acl)(struct mnt_idmap *, struct dentry *, struct posix_acl *, int);
int (*fileattr_set)(struct user_namespace *mnt_userns,
int (*fileattr_set)(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa);
int (*fileattr_get)(struct dentry *dentry, struct fileattr *fa);
};

2
fs/btrfs/ioctl.c
View File

@ -243,7 +243,7 @@ int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
return 0;
}
int btrfs_fileattr_set(struct user_namespace *mnt_userns,
int btrfs_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa)
{
struct inode *inode = d_inode(dentry);

2
fs/btrfs/ioctl.h
View File

@ -6,7 +6,7 @@
long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa);
int btrfs_fileattr_set(struct user_namespace *mnt_userns,
int btrfs_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa);
int btrfs_ioctl_get_supported_features(void __user *arg);
void btrfs_sync_inode_flags_to_i_flags(struct inode *inode);

4
fs/ecryptfs/inode.c
View File

@ -1110,13 +1110,13 @@ static int ecryptfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
return vfs_fileattr_get(ecryptfs_dentry_to_lower(dentry), fa);
}
static int ecryptfs_fileattr_set(struct user_namespace *mnt_userns,
static int ecryptfs_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa)
{
struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
int rc;
rc = vfs_fileattr_set(&init_user_ns, lower_dentry, fa);
rc = vfs_fileattr_set(&nop_mnt_idmap, lower_dentry, fa);
fsstack_copy_attr_all(d_inode(dentry), d_inode(lower_dentry));
return rc;

2
fs/efivarfs/inode.c
View File

@ -163,7 +163,7 @@ efivarfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
}
static int
efivarfs_fileattr_set(struct user_namespace *mnt_userns,
efivarfs_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa)
{
unsigned int i_flags = 0;

2
fs/ext2/ext2.h
View File

@ -762,7 +762,7 @@ extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
/* ioctl.c */
extern int ext2_fileattr_get(struct dentry *dentry, struct fileattr *fa);
extern int ext2_fileattr_set(struct user_namespace *mnt_userns,
extern int ext2_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa);
extern long ext2_ioctl(struct file *, unsigned int, unsigned long);
extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long);

2
fs/ext2/ioctl.c
View File

@ -27,7 +27,7 @@ int ext2_fileattr_get(struct dentry *dentry, struct fileattr *fa)
return 0;
}
int ext2_fileattr_set(struct user_namespace *mnt_userns,
int ext2_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa)
{
struct inode *inode = d_inode(dentry);

2
fs/ext4/ext4.h
View File

@ -3024,7 +3024,7 @@ extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
/* ioctl.c */
extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
int ext4_fileattr_set(struct user_namespace *mnt_userns,
int ext4_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa);
int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa);
extern void ext4_reset_inode_seed(struct inode *inode);

2
fs/ext4/ioctl.c
View File

@ -979,7 +979,7 @@ int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa)
return 0;
}
int ext4_fileattr_set(struct user_namespace *mnt_userns,
int ext4_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa)
{
struct inode *inode = d_inode(dentry);

2
fs/f2fs/f2fs.h
View File

@ -3477,7 +3477,7 @@ int f2fs_truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end);
void f2fs_truncate_data_blocks_range(struct dnode_of_data *dn, int count);
int f2fs_precache_extents(struct inode *inode);
int f2fs_fileattr_get(struct dentry *dentry, struct fileattr *fa);
int f2fs_fileattr_set(struct user_namespace *mnt_userns,
int f2fs_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa);
long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);

2
fs/f2fs/file.c
View File

@ -3092,7 +3092,7 @@ int f2fs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
return 0;
}
int f2fs_fileattr_set(struct user_namespace *mnt_userns,
int f2fs_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa)
{
struct inode *inode = d_inode(dentry);

2
fs/fuse/fuse_i.h
View File

@ -1309,7 +1309,7 @@ long fuse_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
long fuse_file_compat_ioctl(struct file *file, unsigned int cmd,
unsigned long arg);
int fuse_fileattr_get(struct dentry *dentry, struct fileattr *fa);
int fuse_fileattr_set(struct user_namespace *mnt_userns,
int fuse_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa);
/* file.c */

2
fs/fuse/ioctl.c
View File

@ -467,7 +467,7 @@ cleanup:
return err;
}
int fuse_fileattr_set(struct user_namespace *mnt_userns,
int fuse_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa)
{
struct inode *inode = d_inode(dentry);

2
fs/gfs2/file.c
View File

@ -273,7 +273,7 @@ out:
return error;
}
int gfs2_fileattr_set(struct user_namespace *mnt_userns,
int gfs2_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa)
{
struct inode *inode = d_inode(dentry);

2
fs/gfs2/inode.h
View File

@ -111,7 +111,7 @@ extern const struct file_operations gfs2_file_fops_nolock;
extern const struct file_operations gfs2_dir_fops_nolock;
extern int gfs2_fileattr_get(struct dentry *dentry, struct fileattr *fa);
extern int gfs2_fileattr_set(struct user_namespace *mnt_userns,
extern int gfs2_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa);
extern void gfs2_set_inode_flags(struct inode *inode);

2
fs/hfsplus/hfsplus_fs.h
View File

@ -487,7 +487,7 @@ int hfsplus_getattr(struct mnt_idmap *idmap, const struct path *path,
int hfsplus_file_fsync(struct file *file, loff_t start, loff_t end,
int datasync);
int hfsplus_fileattr_get(struct dentry *dentry, struct fileattr *fa);
int hfsplus_fileattr_set(struct user_namespace *mnt_userns,
int hfsplus_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa);
/* ioctl.c */

2
fs/hfsplus/inode.c
View File

@ -655,7 +655,7 @@ int hfsplus_fileattr_get(struct dentry *dentry, struct fileattr *fa)
return 0;
}
int hfsplus_fileattr_set(struct user_namespace *mnt_userns,
int hfsplus_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa)
{
struct inode *inode = d_inode(dentry);

16
fs/ioctl.c
View File

@ -651,7 +651,7 @@ static int fileattr_set_prepare(struct inode *inode,
/**
* vfs_fileattr_set - change miscellaneous file attributes
* @mnt_userns: user namespace of the mount
* @idmap: idmap of the mount
* @dentry: the object to change
* @fa: fileattr pointer
*
@ -665,7 +665,7 @@ static int fileattr_set_prepare(struct inode *inode,
*
* Return: 0 on success, or a negative error on failure.
*/
int vfs_fileattr_set(struct user_namespace *mnt_userns, struct dentry *dentry,
int vfs_fileattr_set(struct mnt_idmap *idmap, struct dentry *dentry,
struct fileattr *fa)
{
struct inode *inode = d_inode(dentry);
@ -675,7 +675,7 @@ int vfs_fileattr_set(struct user_namespace *mnt_userns, struct dentry *dentry,
if (!inode->i_op->fileattr_set)
return -ENOIOCTLCMD;
if (!inode_owner_or_capable(mnt_userns, inode))
if (!inode_owner_or_capable(mnt_idmap_owner(idmap), inode))
return -EPERM;
inode_lock(inode);
@ -693,7 +693,7 @@ int vfs_fileattr_set(struct user_namespace *mnt_userns, struct dentry *dentry,
}
err = fileattr_set_prepare(inode, &old_ma, fa);
if (!err)
err = inode->i_op->fileattr_set(mnt_userns, dentry, fa);
err = inode->i_op->fileattr_set(idmap, dentry, fa);
}
inode_unlock(inode);
@ -714,7 +714,7 @@ static int ioctl_getflags(struct file *file, unsigned int __user *argp)
static int ioctl_setflags(struct file *file, unsigned int __user *argp)
{
struct user_namespace *mnt_userns = file_mnt_user_ns(file);
struct mnt_idmap *idmap = file_mnt_idmap(file);
struct dentry *dentry = file->f_path.dentry;
struct fileattr fa;
unsigned int flags;
@ -725,7 +725,7 @@ static int ioctl_setflags(struct file *file, unsigned int __user *argp)
err = mnt_want_write_file(file);
if (!err) {
fileattr_fill_flags(&fa, flags);
err = vfs_fileattr_set(mnt_userns, dentry, &fa);
err = vfs_fileattr_set(idmap, dentry, &fa);
mnt_drop_write_file(file);
}
}
@ -746,7 +746,7 @@ static int ioctl_fsgetxattr(struct file *file, void __user *argp)
static int ioctl_fssetxattr(struct file *file, void __user *argp)
{
struct user_namespace *mnt_userns = file_mnt_user_ns(file);
struct mnt_idmap *idmap = file_mnt_idmap(file);
struct dentry *dentry = file->f_path.dentry;
struct fileattr fa;
int err;
@ -755,7 +755,7 @@ static int ioctl_fssetxattr(struct file *file, void __user *argp)
if (!err) {
err = mnt_want_write_file(file);
if (!err) {
err = vfs_fileattr_set(mnt_userns, dentry, &fa);
err = vfs_fileattr_set(idmap, dentry, &fa);
mnt_drop_write_file(file);
}
}

2
fs/jfs/ioctl.c
View File

@ -70,7 +70,7 @@ int jfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
return 0;
}
int jfs_fileattr_set(struct user_namespace *mnt_userns,
int jfs_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa)
{
struct inode *inode = d_inode(dentry);

2
fs/jfs/jfs_inode.h
View File

@ -10,7 +10,7 @@ struct fid;
extern struct inode *ialloc(struct inode *, umode_t);
extern int jfs_fsync(struct file *, loff_t, loff_t, int);
extern int jfs_fileattr_get(struct dentry *dentry, struct fileattr *fa);
extern int jfs_fileattr_set(struct user_namespace *mnt_userns,
extern int jfs_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa);
extern long jfs_ioctl(struct file *, unsigned int, unsigned long);
extern struct inode *jfs_iget(struct super_block *, unsigned long);

2
fs/nilfs2/ioctl.c
View File

@ -128,7 +128,7 @@ int nilfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
/**
* nilfs_fileattr_set - ioctl to support chattr
*/
int nilfs_fileattr_set(struct user_namespace *mnt_userns,
int nilfs_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa)
{
struct inode *inode = d_inode(dentry);

2
fs/nilfs2/nilfs.h
View File

@ -242,7 +242,7 @@ extern int nilfs_sync_file(struct file *, loff_t, loff_t, int);
/* ioctl.c */
int nilfs_fileattr_get(struct dentry *dentry, struct fileattr *m);
int nilfs_fileattr_set(struct user_namespace *mnt_userns,
int nilfs_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa);
long nilfs_ioctl(struct file *, unsigned int, unsigned long);
long nilfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);

2
fs/ocfs2/ioctl.c
View File

@ -82,7 +82,7 @@ int ocfs2_fileattr_get(struct dentry *dentry, struct fileattr *fa)
return status;
}
int ocfs2_fileattr_set(struct user_namespace *mnt_userns,
int ocfs2_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa)
{
struct inode *inode = d_inode(dentry);

2
fs/ocfs2/ioctl.h
View File

@ -12,7 +12,7 @@
#define OCFS2_IOCTL_PROTO_H
int ocfs2_fileattr_get(struct dentry *dentry, struct fileattr *fa);
int ocfs2_fileattr_set(struct user_namespace *mnt_userns,
int ocfs2_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa);
long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg);

2
fs/orangefs/inode.c
View File

@ -944,7 +944,7 @@ static int orangefs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
return 0;
}
static int orangefs_fileattr_set(struct user_namespace *mnt_userns,
static int orangefs_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa)
{
u64 val = 0;

4
fs/overlayfs/inode.c
View File

@ -757,10 +757,10 @@ int ovl_real_fileattr_set(const struct path *realpath, struct fileattr *fa)
if (err)
return err;
return vfs_fileattr_set(mnt_user_ns(realpath->mnt), realpath->dentry, fa);
return vfs_fileattr_set(mnt_idmap(realpath->mnt), realpath->dentry, fa);
}
int ovl_fileattr_set(struct user_namespace *mnt_userns,
int ovl_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa)
{
struct inode *inode = d_inode(dentry);

2
fs/overlayfs/overlayfs.h
View File

@ -718,7 +718,7 @@ void ovl_aio_request_cache_destroy(void);
int ovl_real_fileattr_get(const struct path *realpath, struct fileattr *fa);
int ovl_real_fileattr_set(const struct path *realpath, struct fileattr *fa);
int ovl_fileattr_get(struct dentry *dentry, struct fileattr *fa);
int ovl_fileattr_set(struct user_namespace *mnt_userns,
int ovl_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa);
/* copy_up.c */

2
fs/reiserfs/ioctl.c
View File

@ -24,7 +24,7 @@ int reiserfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
return 0;
}
int reiserfs_fileattr_set(struct user_namespace *mnt_userns,
int reiserfs_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa)
{
struct inode *inode = d_inode(dentry);

2
fs/reiserfs/reiserfs.h
View File

@ -3407,7 +3407,7 @@ __u32 r5_hash(const signed char *msg, int len);
/* prototypes from ioctl.c */
int reiserfs_fileattr_get(struct dentry *dentry, struct fileattr *fa);
int reiserfs_fileattr_set(struct user_namespace *mnt_userns,
int reiserfs_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa);
long reiserfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
long reiserfs_compat_ioctl(struct file *filp,

2
fs/ubifs/ioctl.c
View File

@ -144,7 +144,7 @@ int ubifs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
return 0;
}
int ubifs_fileattr_set(struct user_namespace *mnt_userns,
int ubifs_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa)
{
struct inode *inode = d_inode(dentry);

2
fs/ubifs/ubifs.h
View File

@ -2085,7 +2085,7 @@ void ubifs_destroy_size_tree(struct ubifs_info *c);
/* ioctl.c */
int ubifs_fileattr_get(struct dentry *dentry, struct fileattr *fa);
int ubifs_fileattr_set(struct user_namespace *mnt_userns,
int ubifs_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa);
long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
void ubifs_set_inode_flags(struct inode *inode);

3
fs/xfs/xfs_ioctl.c
View File

@ -1297,10 +1297,11 @@ xfs_ioctl_setattr_check_projid(
int
xfs_fileattr_set(
struct user_namespace *mnt_userns,
struct mnt_idmap *idmap,
struct dentry *dentry,
struct fileattr *fa)
{
struct user_namespace *mnt_userns = mnt_idmap_owner(idmap);
struct xfs_inode *ip = XFS_I(d_inode(dentry));
struct xfs_mount *mp = ip->i_mount;
struct xfs_trans *tp;

2
fs/xfs/xfs_ioctl.h
View File

@ -49,7 +49,7 @@ xfs_fileattr_get(
extern int
xfs_fileattr_set(
struct user_namespace *mnt_userns,
struct mnt_idmap *idmap,
struct dentry *dentry,
struct fileattr *fa);

2
include/linux/fileattr.h
View File

@ -53,7 +53,7 @@ static inline bool fileattr_has_fsx(const struct fileattr *fa)
}
int vfs_fileattr_get(struct dentry *dentry, struct fileattr *fa);
int vfs_fileattr_set(struct user_namespace *mnt_userns, struct dentry *dentry,
int vfs_fileattr_set(struct mnt_idmap *idmap, struct dentry *dentry,
struct fileattr *fa);
#endif /* _LINUX_FILEATTR_H */

2
include/linux/fs.h
View File

@ -2168,7 +2168,7 @@ struct inode_operations {
int);
int (*set_acl)(struct mnt_idmap *, struct dentry *,
struct posix_acl *, int);
int (*fileattr_set)(struct user_namespace *mnt_userns,
int (*fileattr_set)(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa);
int (*fileattr_get)(struct dentry *dentry, struct fileattr *fa);
} ____cacheline_aligned;

2
mm/shmem.c
View File

@ -3229,7 +3229,7 @@ static int shmem_fileattr_get(struct dentry *dentry, struct fileattr *fa)
return 0;
}
static int shmem_fileattr_set(struct user_namespace *mnt_userns,
static int shmem_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa)
{
struct inode *inode = d_inode(dentry);