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Support idmapped mount in user namespace

Browse Source 
Linux 5.17 commit torvalds/linux@5dfbfe71e enables "the idmapping 
infrastructure to support idmapped mounts of filesystems mounted 
with an idmapping". Update the OpenZFS accordingly to improve the 
idmapped mount support. 

This pull request contains the following changes:

- xattr setter functions are fixed to take mnt_ns argument. Without
  this, cp -p would fail for an idmapped mount in a user namespace.
- idmap_util is enhanced/fixed for its use in a user ns context.
- One test case added to test idmapped mount in a user ns.

Reviewed-by: Christian Brauner <christian@brauner.io>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Youzhong Yang <yyang@mathworks.com>
Closes #14097
This commit is contained in:
youzhongyang 2022-11-08 13:28:56 -05:00 committed by GitHub
parent 109731cd73
commit f224eddf92
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
21 changed files with 424 additions and 96 deletions
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24
config/kernel-iattr-vfsid.m4 Normal file
View File

@ -0,0 +1,24 @@
dnl #
dnl # 6.0 API change
dnl # struct iattr has two unions for the uid and gid
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_IATTR_VFSID], [
ZFS_LINUX_TEST_SRC([iattr_vfsid], [
#include <linux/fs.h>
], [
struct iattr ia;
ia.ia_vfsuid = (vfsuid_t){0};
ia.ia_vfsgid = (vfsgid_t){0};
])
])
AC_DEFUN([ZFS_AC_KERNEL_IATTR_VFSID], [
AC_MSG_CHECKING([whether iattr->ia_vfsuid and iattr->ia_vfsgid exist])
ZFS_LINUX_TEST_RESULT([iattr_vfsid], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_IATTR_VFSID, 1,
[iattr->ia_vfsuid and iattr->ia_vfsgid exist])
],[
AC_MSG_RESULT(no)
])
])

2
config/kernel.m4
View File

@ -149,6 +149,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
ZFS_AC_KERNEL_SRC___COPY_FROM_USER_INATOMIC
ZFS_AC_KERNEL_SRC_USER_NS_COMMON_INUM
ZFS_AC_KERNEL_SRC_IDMAP_MNT_API
ZFS_AC_KERNEL_SRC_IATTR_VFSID
AC_MSG_CHECKING([for available kernel interfaces])
ZFS_LINUX_TEST_COMPILE_ALL([kabi])
@ -271,6 +272,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
ZFS_AC_KERNEL___COPY_FROM_USER_INATOMIC
ZFS_AC_KERNEL_USER_NS_COMMON_INUM
ZFS_AC_KERNEL_IDMAP_MNT_API
ZFS_AC_KERNEL_IATTR_VFSID
])
dnl #

10
include/os/linux/kernel/linux/xattr_compat.h
View File

@ -146,7 +146,7 @@ fn(const struct xattr_handler *handler, struct user_namespace *user_ns, \
struct dentry *dentry, struct inode *inode, const char *name, \
const void *buffer, size_t size, int flags) \
{ \
return (__ ## fn(inode, name, buffer, size, flags)); \
return (__ ## fn(user_ns, inode, name, buffer, size, flags)); \
}
/*
* 4.7 API change,
@ -160,7 +160,7 @@ fn(const struct xattr_handler *handler, struct dentry *dentry, \
struct inode *inode, const char *name, const void *buffer, \
size_t size, int flags) \
{ \
return (__ ## fn(inode, name, buffer, size, flags)); \
return (__ ## fn(kcred->user_ns, inode, name, buffer, size, flags));\
}
/*
* 4.4 API change,
@ -174,7 +174,8 @@ static int \
fn(const struct xattr_handler *handler, struct dentry *dentry, \
const char *name, const void *buffer, size_t size, int flags) \
{ \
return (__ ## fn(dentry->d_inode, name, buffer, size, flags)); \
return (__ ## fn(kcred->user_ns, dentry->d_inode, name, \
buffer, size, flags)); \
}
/*
* 2.6.33 API change,
@ -187,7 +188,8 @@ static int \
fn(struct dentry *dentry, const char *name, const void *buffer, \
size_t size, int flags, int unused_handler_flags) \
{ \
return (__ ## fn(dentry->d_inode, name, buffer, size, flags)); \
return (__ ## fn(kcred->user_ns, dentry->d_inode, name, \
buffer, size, flags)); \
}
#else
#error "Unsupported kernel"

84
include/os/linux/spl/sys/cred.h
View File

@ -26,11 +26,14 @@
#include <linux/module.h>
#include <linux/cred.h>
#include <linux/sched.h>
#include <sys/types.h>
#include <sys/vfs.h>
typedef struct cred cred_t;
extern struct task_struct init_task;
#define kcred ((cred_t *)(init_task.cred))
#define CRED() ((cred_t *)current_cred())
@ -45,32 +48,80 @@ typedef struct cred cred_t;
#define SGID_TO_KGID(x) (KGIDT_INIT(x))
#define KGIDP_TO_SGIDP(x) (&(x)->val)
static inline uid_t zfs_uid_into_mnt(struct user_namespace *mnt_ns, uid_t uid)
/* Check if the user ns is the initial one */
static inline boolean_t
zfs_is_init_userns(struct user_namespace *user_ns)
{
if (mnt_ns)
return (__kuid_val(make_kuid(mnt_ns, uid)));
return (uid);
#if defined(CONFIG_USER_NS)
return (user_ns == kcred->user_ns);
#else
return (B_FALSE);
#endif
}
static inline gid_t zfs_gid_into_mnt(struct user_namespace *mnt_ns, gid_t gid)
static inline struct user_namespace *zfs_i_user_ns(struct inode *inode)
{
if (mnt_ns)
return (__kgid_val(make_kgid(mnt_ns, gid)));
return (gid);
#ifdef HAVE_SUPER_USER_NS
return (inode->i_sb->s_user_ns);
#else
return (kcred->user_ns);
#endif
}
static inline uid_t zfs_uid_from_mnt(struct user_namespace *mnt_ns, uid_t uid)
static inline boolean_t zfs_no_idmapping(struct user_namespace *mnt_userns,
struct user_namespace *fs_userns)
{
if (mnt_ns)
return (from_kuid(mnt_ns, KUIDT_INIT(uid)));
return (uid);
return (zfs_is_init_userns(mnt_userns) || mnt_userns == fs_userns);
}
static inline gid_t zfs_gid_from_mnt(struct user_namespace *mnt_ns, gid_t gid)
static inline uid_t zfs_uid_to_vfsuid(struct user_namespace *mnt_userns,
struct user_namespace *fs_userns, uid_t uid)
{
if (mnt_ns)
return (from_kgid(mnt_ns, KGIDT_INIT(gid)));
return (gid);
if (zfs_no_idmapping(mnt_userns, fs_userns))
return (uid);
if (!zfs_is_init_userns(fs_userns))
uid = from_kuid(fs_userns, KUIDT_INIT(uid));
if (uid == (uid_t)-1)
return (uid);
return (__kuid_val(make_kuid(mnt_userns, uid)));
}
static inline gid_t zfs_gid_to_vfsgid(struct user_namespace *mnt_userns,
struct user_namespace *fs_userns, gid_t gid)
{
if (zfs_no_idmapping(mnt_userns, fs_userns))
return (gid);
if (!zfs_is_init_userns(fs_userns))
gid = from_kgid(fs_userns, KGIDT_INIT(gid));
if (gid == (gid_t)-1)
return (gid);
return (__kgid_val(make_kgid(mnt_userns, gid)));
}
static inline uid_t zfs_vfsuid_to_uid(struct user_namespace *mnt_userns,
struct user_namespace *fs_userns, uid_t uid)
{
if (zfs_no_idmapping(mnt_userns, fs_userns))
return (uid);
uid = from_kuid(mnt_userns, KUIDT_INIT(uid));
if (uid == (uid_t)-1)
return (uid);
if (zfs_is_init_userns(fs_userns))
return (uid);
return (__kuid_val(make_kuid(fs_userns, uid)));
}
static inline gid_t zfs_vfsgid_to_gid(struct user_namespace *mnt_userns,
struct user_namespace *fs_userns, gid_t gid)
{
if (zfs_no_idmapping(mnt_userns, fs_userns))
return (gid);
gid = from_kgid(mnt_userns, KGIDT_INIT(gid));
if (gid == (gid_t)-1)
return (gid);
if (zfs_is_init_userns(fs_userns))
return (gid);
return (__kgid_val(make_kgid(fs_userns, gid)));
}
extern void crhold(cred_t *cr);
@ -81,5 +132,4 @@ extern gid_t crgetgid(const cred_t *cr);
extern int crgetngroups(const cred_t *cr);
extern gid_t *crgetgroups(const cred_t *cr);
extern int groupmember(gid_t gid, const cred_t *cr);
#endif /* _SPL_CRED_H */

5
include/os/linux/zfs/sys/policy.h
View File

@ -47,13 +47,14 @@ int secpolicy_vnode_create_gid(const cred_t *);
int secpolicy_vnode_remove(const cred_t *);
int secpolicy_vnode_setdac(const cred_t *, uid_t);
int secpolicy_vnode_setid_retain(struct znode *, const cred_t *, boolean_t);
int secpolicy_vnode_setids_setgids(const cred_t *, gid_t, zuserns_t *);
int secpolicy_vnode_setids_setgids(const cred_t *, gid_t, zuserns_t *,
zuserns_t *);
int secpolicy_zinject(const cred_t *);
int secpolicy_zfs(const cred_t *);
int secpolicy_zfs_proc(const cred_t *, proc_t *);
void secpolicy_setid_clear(vattr_t *, cred_t *);
int secpolicy_setid_setsticky_clear(struct inode *, vattr_t *,
const vattr_t *, cred_t *, zuserns_t *);
const vattr_t *, cred_t *, zuserns_t *, zuserns_t *);
int secpolicy_xvattr(xvattr_t *, uid_t, cred_t *, mode_t);
int secpolicy_vnode_setattr(cred_t *, struct inode *, struct vattr *,
const struct vattr *, int, int (void *, int, cred_t *), void *);

17
module/os/linux/zfs/policy.c
View File

@ -214,9 +214,10 @@ secpolicy_vnode_setid_retain(struct znode *zp __maybe_unused, const cred_t *cr,
* Determine that subject can set the file setgid flag.
*/
int
secpolicy_vnode_setids_setgids(const cred_t *cr, gid_t gid, zuserns_t *mnt_ns)
secpolicy_vnode_setids_setgids(const cred_t *cr, gid_t gid, zuserns_t *mnt_ns,
zuserns_t *fs_ns)
{
gid = zfs_gid_into_mnt(mnt_ns, gid);
gid = zfs_gid_to_vfsgid(mnt_ns, fs_ns, gid);
#if defined(CONFIG_USER_NS)
if (!kgid_has_mapping(cr->user_ns, SGID_TO_KGID(gid)))
return (EPERM);
@ -285,9 +286,10 @@ secpolicy_setid_clear(vattr_t *vap, cred_t *cr)
* Determine that subject can set the file setid flags.
*/
static int
secpolicy_vnode_setid_modify(const cred_t *cr, uid_t owner, zuserns_t *mnt_ns)
secpolicy_vnode_setid_modify(const cred_t *cr, uid_t owner, zuserns_t *mnt_ns,
zuserns_t *fs_ns)
{
owner = zfs_uid_into_mnt(mnt_ns, owner);
owner = zfs_uid_to_vfsuid(mnt_ns, fs_ns, owner);
if (crgetuid(cr) == owner)
return (0);
@ -313,13 +315,13 @@ secpolicy_vnode_stky_modify(const cred_t *cr)
int
secpolicy_setid_setsticky_clear(struct inode *ip, vattr_t *vap,
const vattr_t *ovap, cred_t *cr, zuserns_t *mnt_ns)
const vattr_t *ovap, cred_t *cr, zuserns_t *mnt_ns, zuserns_t *fs_ns)
{
int error;
if ((vap->va_mode & S_ISUID) != 0 &&
(error = secpolicy_vnode_setid_modify(cr,
ovap->va_uid, mnt_ns)) != 0) {
ovap->va_uid, mnt_ns, fs_ns)) != 0) {
return (error);
}
@ -337,7 +339,8 @@ secpolicy_setid_setsticky_clear(struct inode *ip, vattr_t *vap,
* group-id bit.
*/
if ((vap->va_mode & S_ISGID) != 0 &&
secpolicy_vnode_setids_setgids(cr, ovap->va_gid, mnt_ns) != 0) {
secpolicy_vnode_setids_setgids(cr, ovap->va_gid,
mnt_ns, fs_ns) != 0) {
vap->va_mode &= ~S_ISGID;
}

24
module/os/linux/zfs/zfs_acl.c
View File

@ -1889,7 +1889,8 @@ zfs_acl_ids_create(znode_t *dzp, int flag, vattr_t *vap, cred_t *cr,
acl_ids->z_mode |= S_ISGID;
} else {
if ((acl_ids->z_mode & S_ISGID) &&
secpolicy_vnode_setids_setgids(cr, gid, mnt_ns) != 0) {
secpolicy_vnode_setids_setgids(cr, gid, mnt_ns,
zfs_i_user_ns(ZTOI(dzp))) != 0) {
acl_ids->z_mode &= ~S_ISGID;
}
}
@ -1979,7 +1980,8 @@ zfs_getacl(znode_t *zp, vsecattr_t *vsecp, boolean_t skipaclchk, cred_t *cr)
if (mask == 0)
return (SET_ERROR(ENOSYS));
if ((error = zfs_zaccess(zp, ACE_READ_ACL, 0, skipaclchk, cr, NULL)))
if ((error = zfs_zaccess(zp, ACE_READ_ACL, 0, skipaclchk, cr,
kcred->user_ns)))
return (error);
mutex_enter(&zp->z_acl_lock);
@ -2138,7 +2140,8 @@ zfs_setacl(znode_t *zp, vsecattr_t *vsecp, boolean_t skipaclchk, cred_t *cr)
if (zp->z_pflags & ZFS_IMMUTABLE)
return (SET_ERROR(EPERM));
if ((error = zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr, NULL)))
if ((error = zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr,
kcred->user_ns)))
return (error);
error = zfs_vsec_2_aclp(zfsvfs, ZTOI(zp)->i_mode, vsecp, cr, &fuidp,
@ -2301,9 +2304,9 @@ zfs_zaccess_aces_check(znode_t *zp, uint32_t *working_mode,
uid_t fowner;
if (mnt_ns) {
fowner = zfs_uid_into_mnt(mnt_ns,
fowner = zfs_uid_to_vfsuid(mnt_ns, zfs_i_user_ns(ZTOI(zp)),
KUID_TO_SUID(ZTOI(zp)->i_uid));
gowner = zfs_gid_into_mnt(mnt_ns,
gowner = zfs_gid_to_vfsgid(mnt_ns, zfs_i_user_ns(ZTOI(zp)),
KGID_TO_SGID(ZTOI(zp)->i_gid));
} else
zfs_fuid_map_ids(zp, cr, &fowner, &gowner);
@ -2417,7 +2420,8 @@ zfs_has_access(znode_t *zp, cred_t *cr)
{
uint32_t have = ACE_ALL_PERMS;
if (zfs_zaccess_aces_check(zp, &have, B_TRUE, cr, NULL) != 0) {
if (zfs_zaccess_aces_check(zp, &have, B_TRUE, cr,
kcred->user_ns) != 0) {
uid_t owner;
owner = zfs_fuid_map_id(ZTOZSB(zp),
@ -2610,7 +2614,8 @@ slow:
DTRACE_PROBE(zfs__fastpath__execute__access__miss);
if ((error = zfs_enter(ZTOZSB(zdp), FTAG)) != 0)
return (error);
error = zfs_zaccess(zdp, ACE_EXECUTE, 0, B_FALSE, cr, NULL);
error = zfs_zaccess(zdp, ACE_EXECUTE, 0, B_FALSE, cr,
kcred->user_ns);
zfs_exit(ZTOZSB(zdp), FTAG);
return (error);
}
@ -2662,7 +2667,8 @@ zfs_zaccess(znode_t *zp, int mode, int flags, boolean_t skipaclchk, cred_t *cr,
}
}
owner = zfs_uid_into_mnt(mnt_ns, KUID_TO_SUID(ZTOI(zp)->i_uid));
owner = zfs_uid_to_vfsuid(mnt_ns, zfs_i_user_ns(ZTOI(zp)),
KUID_TO_SUID(ZTOI(zp)->i_uid));
owner = zfs_fuid_map_id(ZTOZSB(zp), owner, cr, ZFS_OWNER);
/*
@ -2786,7 +2792,7 @@ zfs_zaccess_unix(znode_t *zp, mode_t mode, cred_t *cr)
{
int v4_mode = zfs_unix_to_v4(mode >> 6);
return (zfs_zaccess(zp, v4_mode, 0, B_FALSE, cr, NULL));
return (zfs_zaccess(zp, v4_mode, 0, B_FALSE, cr, kcred->user_ns));
}
/* See zfs_zaccess_delete() */

7
module/os/linux/zfs/zfs_dir.c
View File

@ -1113,11 +1113,11 @@ zfs_make_xattrdir(znode_t *zp, vattr_t *vap, znode_t **xzpp, cred_t *cr)
*xzpp = NULL;
if ((error = zfs_zaccess(zp, ACE_WRITE_NAMED_ATTRS, 0, B_FALSE, cr,
NULL)))
kcred->user_ns)))
return (error);
if ((error = zfs_acl_ids_create(zp, IS_XATTR, vap, cr, NULL,
&acl_ids, NULL)) != 0)
&acl_ids, kcred->user_ns)) != 0)
return (error);
if (zfs_acl_ids_overquota(zfsvfs, &acl_ids, zp->z_projid)) {
zfs_acl_ids_free(&acl_ids);
@ -1265,7 +1265,8 @@ zfs_sticky_remove_access(znode_t *zdp, znode_t *zp, cred_t *cr)
cr, ZFS_OWNER);
if ((uid = crgetuid(cr)) == downer || uid == fowner ||
zfs_zaccess(zp, ACE_WRITE_DATA, 0, B_FALSE, cr, NULL) == 0)
zfs_zaccess(zp, ACE_WRITE_DATA, 0, B_FALSE, cr,
kcred->user_ns) == 0)
return (0);
else
return (secpolicy_vnode_remove(cr));

25
module/os/linux/zfs/zfs_vnops_os.c
View File

@ -476,7 +476,7 @@ zfs_lookup(znode_t *zdp, char *nm, znode_t **zpp, int flags, cred_t *cr,
*/
if ((error = zfs_zaccess(*zpp, ACE_EXECUTE, 0,
B_TRUE, cr, NULL))) {
B_TRUE, cr, kcred->user_ns))) {
zrele(*zpp);
*zpp = NULL;
}
@ -494,7 +494,8 @@ zfs_lookup(znode_t *zdp, char *nm, znode_t **zpp, int flags, cred_t *cr,
* Check accessibility of directory.
*/
if ((error = zfs_zaccess(zdp, ACE_EXECUTE, 0, B_FALSE, cr, NULL))) {
if ((error = zfs_zaccess(zdp, ACE_EXECUTE, 0, B_FALSE, cr,
kcred->user_ns))) {
zfs_exit(zfsvfs, FTAG);
return (error);
}
@ -972,7 +973,7 @@ top:
return (error);
}
if ((error = zfs_zaccess_delete(dzp, zp, cr, NULL))) {
if ((error = zfs_zaccess_delete(dzp, zp, cr, kcred->user_ns))) {
goto out;
}
@ -1386,7 +1387,7 @@ top:
return (error);
}
if ((error = zfs_zaccess_delete(dzp, zp, cr, NULL))) {
if ((error = zfs_zaccess_delete(dzp, zp, cr, kcred->user_ns))) {
goto out;
}
@ -2024,10 +2025,10 @@ top:
* Take ownership or chgrp to group we are a member of
*/
uid = zfs_uid_into_mnt((struct user_namespace *)mnt_ns,
vap->va_uid);
gid = zfs_gid_into_mnt((struct user_namespace *)mnt_ns,
vap->va_gid);
uid = zfs_uid_to_vfsuid((struct user_namespace *)mnt_ns,
zfs_i_user_ns(ip), vap->va_uid);
gid = zfs_gid_to_vfsgid((struct user_namespace *)mnt_ns,
zfs_i_user_ns(ip), vap->va_gid);
take_owner = (mask & ATTR_UID) && (uid == crgetuid(cr));
take_group = (mask & ATTR_GID) &&
zfs_groupmember(zfsvfs, gid, cr);
@ -2162,7 +2163,7 @@ top:
if (zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr,
mnt_ns) == 0) {
err = secpolicy_setid_setsticky_clear(ip, vap,
&oldva, cr, mnt_ns);
&oldva, cr, mnt_ns, zfs_i_user_ns(ip));
if (err)
goto out3;
trim_mask |= ATTR_MODE;
@ -3506,7 +3507,8 @@ zfs_link(znode_t *tdzp, znode_t *szp, char *name, cred_t *cr,
return (SET_ERROR(EPERM));
}
if ((error = zfs_zaccess(tdzp, ACE_ADD_FILE, 0, B_FALSE, cr, NULL))) {
if ((error = zfs_zaccess(tdzp, ACE_ADD_FILE, 0, B_FALSE, cr,
kcred->user_ns))) {
zfs_exit(zfsvfs, FTAG);
return (error);
}
@ -4132,7 +4134,8 @@ zfs_space(znode_t *zp, int cmd, flock64_t *bfp, int flag,
* On Linux we can get here through truncate_range() which
* operates directly on inodes, so we need to check access rights.
*/
if ((error = zfs_zaccess(zp, ACE_WRITE_DATA, 0, B_FALSE, cr, NULL))) {
if ((error = zfs_zaccess(zp, ACE_WRITE_DATA, 0, B_FALSE, cr,
kcred->user_ns))) {
zfs_exit(zfsvfs, FTAG);
return (error);
}

2
module/os/linux/zfs/zfs_znode.c
View File

@ -1964,7 +1964,7 @@ zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx)
}
VERIFY(0 == zfs_acl_ids_create(rootzp, IS_ROOT_NODE, &vattr,
cr, NULL, &acl_ids, NULL));
cr, NULL, &acl_ids, kcred->user_ns));
zfs_mknode(rootzp, &vattr, tx, cr, IS_ROOT_NODE, &zp, &acl_ids);
ASSERT3P(zp, ==, rootzp);
error = zap_add(os, moid, ZFS_ROOT_OBJ, 8, 1, &rootzp->z_id, tx);

2
module/os/linux/zfs/zpl_ctldir.c
View File

@ -374,7 +374,7 @@ zpl_snapdir_mkdir(struct inode *dip, struct dentry *dentry, umode_t mode)
#ifdef HAVE_IOPS_MKDIR_USERNS
zpl_vap_init(vap, dip, mode | S_IFDIR, cr, user_ns);
#else
zpl_vap_init(vap, dip, mode | S_IFDIR, cr, NULL);
zpl_vap_init(vap, dip, mode | S_IFDIR, cr, kcred->user_ns);
#endif
error = -zfsctl_snapdir_mkdir(dip, dname(dentry), vap, &ip, cr, 0);

6
module/os/linux/zfs/zpl_file.c
View File

@ -1085,7 +1085,7 @@ zpl_ioctl_setflags(struct file *filp, void __user *arg)
crhold(cr);
cookie = spl_fstrans_mark();
err = -zfs_setattr(ITOZ(ip), (vattr_t *)&xva, 0, cr, NULL);
err = -zfs_setattr(ITOZ(ip), (vattr_t *)&xva, 0, cr, kcred->user_ns);
spl_fstrans_unmark(cookie);
crfree(cr);
@ -1133,7 +1133,7 @@ zpl_ioctl_setxattr(struct file *filp, void __user *arg)
crhold(cr);
cookie = spl_fstrans_mark();
err = -zfs_setattr(ITOZ(ip), (vattr_t *)&xva, 0, cr, NULL);
err = -zfs_setattr(ITOZ(ip), (vattr_t *)&xva, 0, cr, kcred->user_ns);
spl_fstrans_unmark(cookie);
crfree(cr);
@ -1221,7 +1221,7 @@ zpl_ioctl_setdosflags(struct file *filp, void __user *arg)
crhold(cr);
cookie = spl_fstrans_mark();
err = -zfs_setattr(ITOZ(ip), (vattr_t *)&xva, 0, cr, NULL);
err = -zfs_setattr(ITOZ(ip), (vattr_t *)&xva, 0, cr, kcred->user_ns);
spl_fstrans_unmark(cookie);
crfree(cr);

38
module/os/linux/zfs/zpl_inode.c
View File

@ -118,16 +118,16 @@ zpl_vap_init(vattr_t *vap, struct inode *dir, umode_t mode, cred_t *cr,
vap->va_mask = ATTR_MODE;
vap->va_mode = mode;
vap->va_uid = zfs_uid_from_mnt((struct user_namespace *)mnt_ns,
crgetuid(cr));
vap->va_uid = zfs_vfsuid_to_uid((struct user_namespace *)mnt_ns,
zfs_i_user_ns(dir), crgetuid(cr));
if (dir && dir->i_mode & S_ISGID) {
vap->va_gid = KGID_TO_SGID(dir->i_gid);
if (S_ISDIR(mode))
vap->va_mode |= S_ISGID;
} else {
vap->va_gid = zfs_gid_from_mnt((struct user_namespace *)mnt_ns,
crgetgid(cr));
vap->va_gid = zfs_vfsgid_to_gid((struct user_namespace *)mnt_ns,
zfs_i_user_ns(dir), crgetgid(cr));
}
}
@ -145,7 +145,7 @@ zpl_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool flag)
int error;
fstrans_cookie_t cookie;
#ifndef HAVE_IOPS_CREATE_USERNS
zuserns_t *user_ns = NULL;
zuserns_t *user_ns = kcred->user_ns;
#endif
crhold(cr);
@ -192,7 +192,7 @@ zpl_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
int error;
fstrans_cookie_t cookie;
#ifndef HAVE_IOPS_MKNOD_USERNS
zuserns_t *user_ns = NULL;
zuserns_t *user_ns = kcred->user_ns;
#endif
/*
@ -247,7 +247,7 @@ zpl_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
int error;
fstrans_cookie_t cookie;
#ifndef HAVE_TMPFILE_USERNS
zuserns_t *userns = NULL;
zuserns_t *userns = kcred->user_ns;
#endif
crhold(cr);
@ -325,7 +325,7 @@ zpl_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
int error;
fstrans_cookie_t cookie;
#ifndef HAVE_IOPS_MKDIR_USERNS
zuserns_t *user_ns = NULL;
zuserns_t *user_ns = kcred->user_ns;
#endif
crhold(cr);
@ -468,8 +468,20 @@ zpl_setattr(struct dentry *dentry, struct iattr *ia)
vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP);
vap->va_mask = ia->ia_valid & ATTR_IATTR_MASK;
vap->va_mode = ia->ia_mode;
vap->va_uid = KUID_TO_SUID(ia->ia_uid);
vap->va_gid = KGID_TO_SGID(ia->ia_gid);
if (ia->ia_valid & ATTR_UID)
#ifdef HAVE_IATTR_VFSID
vap->va_uid = zfs_vfsuid_to_uid(user_ns, zfs_i_user_ns(ip),
__vfsuid_val(ia->ia_vfsuid));
#else
vap->va_uid = KUID_TO_SUID(ia->ia_uid);
#endif
if (ia->ia_valid & ATTR_GID)
#ifdef HAVE_IATTR_VFSID
vap->va_gid = zfs_vfsgid_to_gid(user_ns, zfs_i_user_ns(ip),
__vfsgid_val(ia->ia_vfsgid));
#else
vap->va_gid = KGID_TO_SGID(ia->ia_gid);
#endif
vap->va_size = ia->ia_size;
vap->va_atime = ia->ia_atime;
vap->va_mtime = ia->ia_mtime;
@ -482,7 +494,7 @@ zpl_setattr(struct dentry *dentry, struct iattr *ia)
#ifdef HAVE_SETATTR_PREPARE_USERNS
error = -zfs_setattr(ITOZ(ip), vap, 0, cr, user_ns);
#else
error = -zfs_setattr(ITOZ(ip), vap, 0, cr, NULL);
error = -zfs_setattr(ITOZ(ip), vap, 0, cr, kcred->user_ns);
#endif
if (!error && (ia->ia_valid & ATTR_MODE))
error = zpl_chmod_acl(ip);
@ -510,7 +522,7 @@ zpl_rename2(struct inode *sdip, struct dentry *sdentry,
int error;
fstrans_cookie_t cookie;
#ifndef HAVE_IOPS_RENAME_USERNS
zuserns_t *user_ns = NULL;
zuserns_t *user_ns = kcred->user_ns;
#endif
crhold(cr);
@ -557,7 +569,7 @@ zpl_symlink(struct inode *dir, struct dentry *dentry, const char *name)
int error;
fstrans_cookie_t cookie;
#ifndef HAVE_IOPS_SYMLINK_USERNS
zuserns_t *user_ns = NULL;
zuserns_t *user_ns = kcred->user_ns;
#endif
crhold(cr);

34
module/os/linux/zfs/zpl_xattr.c
View File

@ -499,7 +499,7 @@ zpl_xattr_set_dir(struct inode *ip, const char *name, const void *value,
vap->va_gid = crgetgid(cr);
error = -zfs_create(dxzp, (char *)name, vap, 0, 0644, &xzp,
cr, 0, NULL, NULL);
cr, 0, NULL, kcred->user_ns);
if (error)
goto out;
}
@ -738,9 +738,11 @@ __zpl_xattr_user_get(struct inode *ip, const char *name,
ZPL_XATTR_GET_WRAPPER(zpl_xattr_user_get);
static int
__zpl_xattr_user_set(struct inode *ip, const char *name,
__zpl_xattr_user_set(struct user_namespace *user_ns,
struct inode *ip, const char *name,
const void *value, size_t size, int flags)
{
(void) user_ns;
int error = 0;
/* xattr_resolve_name will do this for us if this is defined */
#ifndef HAVE_XATTR_HANDLER_NAME
@ -846,9 +848,11 @@ __zpl_xattr_trusted_get(struct inode *ip, const char *name,
ZPL_XATTR_GET_WRAPPER(zpl_xattr_trusted_get);
static int
__zpl_xattr_trusted_set(struct inode *ip, const char *name,
__zpl_xattr_trusted_set(struct user_namespace *user_ns,
struct inode *ip, const char *name,
const void *value, size_t size, int flags)
{
(void) user_ns;
char *xattr_name;
int error;
@ -914,9 +918,11 @@ __zpl_xattr_security_get(struct inode *ip, const char *name,
ZPL_XATTR_GET_WRAPPER(zpl_xattr_security_get);
static int
__zpl_xattr_security_set(struct inode *ip, const char *name,
__zpl_xattr_security_set(struct user_namespace *user_ns,
struct inode *ip, const char *name,
const void *value, size_t size, int flags)
{
(void) user_ns;
char *xattr_name;
int error;
/* xattr_resolve_name will do this for us if this is defined */
@ -940,7 +946,7 @@ zpl_xattr_security_init_impl(struct inode *ip, const struct xattr *xattrs,
int error = 0;
for (xattr = xattrs; xattr->name != NULL; xattr++) {
error = __zpl_xattr_security_set(ip,
error = __zpl_xattr_security_set(NULL, ip,
xattr->name, xattr->value, xattr->value_len, 0);
if (error < 0)
@ -1300,7 +1306,8 @@ __zpl_xattr_acl_get_default(struct inode *ip, const char *name,
ZPL_XATTR_GET_WRAPPER(zpl_xattr_acl_get_default);
static int
__zpl_xattr_acl_set_access(struct inode *ip, const char *name,
__zpl_xattr_acl_set_access(struct user_namespace *mnt_ns,
struct inode *ip, const char *name,
const void *value, size_t size, int flags)
{
struct posix_acl *acl;
@ -1314,8 +1321,14 @@ __zpl_xattr_acl_set_access(struct inode *ip, const char *name,
if (ITOZSB(ip)->z_acl_type != ZFS_ACLTYPE_POSIX)
return (-EOPNOTSUPP);
#if defined(HAVE_XATTR_SET_USERNS)
if (!zpl_inode_owner_or_capable(mnt_ns, ip))
return (-EPERM);
#else
(void) mnt_ns;
if (!zpl_inode_owner_or_capable(kcred->user_ns, ip))
return (-EPERM);
#endif
if (value) {
acl = zpl_acl_from_xattr(value, size);
@ -1339,7 +1352,8 @@ __zpl_xattr_acl_set_access(struct inode *ip, const char *name,
ZPL_XATTR_SET_WRAPPER(zpl_xattr_acl_set_access);
static int
__zpl_xattr_acl_set_default(struct inode *ip, const char *name,
__zpl_xattr_acl_set_default(struct user_namespace *mnt_ns,
struct inode *ip, const char *name,
const void *value, size_t size, int flags)
{
struct posix_acl *acl;
@ -1353,8 +1367,14 @@ __zpl_xattr_acl_set_default(struct inode *ip, const char *name,
if (ITOZSB(ip)->z_acl_type != ZFS_ACLTYPE_POSIX)
return (-EOPNOTSUPP);
#if defined(HAVE_XATTR_SET_USERNS)
if (!zpl_inode_owner_or_capable(mnt_ns, ip))
return (-EPERM);
#else
(void) mnt_ns;
if (!zpl_inode_owner_or_capable(kcred->user_ns, ip))
return (-EPERM);
#endif
if (value) {
acl = zpl_acl_from_xattr(value, size);

35
module/zfs/zfs_replay.c
View File

@ -386,8 +386,13 @@ zfs_replay_create_acl(void *arg1, void *arg2, boolean_t byteswap)
lr->lr_uid, lr->lr_gid);
}
#if defined(__linux__)
error = zfs_create(dzp, name, &xva.xva_vattr,
0, 0, &zp, kcred, vflg, &vsec, kcred->user_ns);
#else
error = zfs_create(dzp, name, &xva.xva_vattr,
0, 0, &zp, kcred, vflg, &vsec, NULL);
#endif
break;
case TX_MKDIR_ACL:
aclstart = (caddr_t)(lracl + 1);
@ -416,8 +421,13 @@ zfs_replay_create_acl(void *arg1, void *arg2, boolean_t byteswap)
(void *)&name, lracl->lr_fuidcnt, lracl->lr_domcnt,
lr->lr_uid, lr->lr_gid);
}
#if defined(__linux__)
error = zfs_mkdir(dzp, name, &xva.xva_vattr,
&zp, kcred, vflg, &vsec, kcred->user_ns);
#else
error = zfs_mkdir(dzp, name, &xva.xva_vattr,
&zp, kcred, vflg, &vsec, NULL);
#endif
break;
default:
error = SET_ERROR(ENOTSUP);
@ -527,8 +537,13 @@ zfs_replay_create(void *arg1, void *arg2, boolean_t byteswap)
if (name == NULL)
name = (char *)start;
#if defined(__linux__)
error = zfs_create(dzp, name, &xva.xva_vattr,
0, 0, &zp, kcred, vflg, NULL, kcred->user_ns);
#else
error = zfs_create(dzp, name, &xva.xva_vattr,
0, 0, &zp, kcred, vflg, NULL, NULL);
#endif
break;
case TX_MKDIR_ATTR:
lrattr = (lr_attr_t *)(caddr_t)(lr + 1);
@ -545,8 +560,14 @@ zfs_replay_create(void *arg1, void *arg2, boolean_t byteswap)
if (name == NULL)
name = (char *)(lr + 1);
#if defined(__linux__)
error = zfs_mkdir(dzp, name, &xva.xva_vattr,
&zp, kcred, vflg, NULL, kcred->user_ns);
#else
error = zfs_mkdir(dzp, name, &xva.xva_vattr,
&zp, kcred, vflg, NULL, NULL);
#endif
break;
case TX_MKXATTR:
error = zfs_make_xattrdir(dzp, &xva.xva_vattr, &zp, kcred);
@ -554,8 +575,13 @@ zfs_replay_create(void *arg1, void *arg2, boolean_t byteswap)
case TX_SYMLINK:
name = (char *)(lr + 1);
link = name + strlen(name) + 1;
#if defined(__linux__)
error = zfs_symlink(dzp, name, &xva.xva_vattr,
link, &zp, kcred, vflg, kcred->user_ns);
#else
error = zfs_symlink(dzp, name, &xva.xva_vattr,
link, &zp, kcred, vflg, NULL);
#endif
break;
default:
error = SET_ERROR(ENOTSUP);
@ -670,8 +696,13 @@ do_zfs_replay_rename(zfsvfs_t *zfsvfs, lr_rename_t *lr, char *sname,
if (lr->lr_common.lrc_txtype & TX_CI)
vflg |= FIGNORECASE;
#if defined(__linux__)
error = zfs_rename(sdzp, sname, tdzp, tname, kcred, vflg, rflags,
wo_vap, kcred->user_ns);
#else
error = zfs_rename(sdzp, sname, tdzp, tname, kcred, vflg, rflags,
wo_vap, NULL);
#endif
zrele(tdzp);
zrele(sdzp);
@ -944,7 +975,11 @@ zfs_replay_setattr(void *arg1, void *arg2, boolean_t byteswap)
zfsvfs->z_fuid_replay = zfs_replay_fuid_domain(start, &start,
lr->lr_uid, lr->lr_gid);
#if defined(__linux__)
error = zfs_setattr(zp, vap, 0, kcred, kcred->user_ns);
#else
error = zfs_setattr(zp, vap, 0, kcred, NULL);
#endif
zfs_fuid_info_free(zfsvfs->z_fuid_replay);
zfsvfs->z_fuid_replay = NULL;

12
module/zfs/zfs_vnops.c
View File

@ -168,9 +168,19 @@ zfs_access(znode_t *zp, int mode, int flag, cred_t *cr)
return (error);
if (flag & V_ACE_MASK)
error = zfs_zaccess(zp, mode, flag, B_FALSE, cr, NULL);
#if defined(__linux__)
error = zfs_zaccess(zp, mode, flag, B_FALSE, cr,
kcred->user_ns);
#else
error = zfs_zaccess(zp, mode, flag, B_FALSE, cr,
NULL);
#endif
else
#if defined(__linux__)
error = zfs_zaccess_rwx(zp, mode, flag, cr, kcred->user_ns);
#else
error = zfs_zaccess_rwx(zp, mode, flag, cr, NULL);
#endif
zfs_exit(zfsvfs, FTAG);
return (error);

2
tests/runfiles/linux.run
View File

@ -200,5 +200,5 @@ tags = ['functional', 'zvol', 'zvol_misc']
[tests/functional/idmap_mount:Linux]
tests = ['idmap_mount_001', 'idmap_mount_002', 'idmap_mount_003',
'idmap_mount_004']
'idmap_mount_004', 'idmap_mount_005']
tags = ['functional', 'idmap_mount']

1
tests/test-runner/bin/zts-report.py.in
View File

@ -284,6 +284,7 @@ elif sys.platform.startswith('linux'):
'idmap_mount/idmap_mount_002': ['SKIP', idmap_reason],
'idmap_mount/idmap_mount_003': ['SKIP', idmap_reason],
'idmap_mount/idmap_mount_004': ['SKIP', idmap_reason],
'idmap_mount/idmap_mount_005': ['SKIP', idmap_reason],
})

49
tests/zfs-tests/cmd/idmap_util.c
View File

@ -36,6 +36,7 @@
#include <errno.h>
#include <sched.h>
#include <syscall.h>
#include <sys/socket.h>
#include <sys/list.h>
@ -458,43 +459,56 @@ userns_fd_from_idmap(list_t *head)
{
pid_t pid;
int ret, fd;
int pipe_fd[2];
int fds[2];
char c;
int saved_errno = 0;
/* pipe for bidirectional communication */
ret = pipe(pipe_fd);
/* socketpair for bidirectional communication */
ret = socketpair(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, fds);
if (ret) {
log_errno("pipe");
log_errno("socketpair");
return (-errno);
}
pid = fork();
if (pid < 0) {
log_errno("fork");
return (-errno);
fd = -errno;
goto out;
}
if (pid == 0) {
/* child process */
close(pipe_fd[0]);
ret = unshare(CLONE_NEWUSER);
if (ret == 0) {
/* notify the parent of success */
ret = write_buf(pipe_fd[1], "1", 1);
ret = write_buf(fds[1], "1", 1);
if (ret < 0)
saved_errno = errno;
else {
/*
* Until the parent has written to idmap,
* we cannot exit, otherwise the defunct
* process is owned by the real root, writing
* to its idmap ends up with EPERM in the
* context of a user ns
*/
ret = read_buf(fds[1], &c, 1);
if (ret < 0)
saved_errno = errno;
}
} else {
saved_errno = errno;
log_errno("unshare");
ret = write_buf(pipe_fd[1], "0", 1);
ret = write_buf(fds[1], "0", 1);
if (ret < 0)
saved_errno = errno;
}
if (ret < 0)
saved_errno = errno;
close(pipe_fd[1]);
exit(saved_errno);
}
/* parent process */
close(pipe_fd[1]);
ret = read_buf(pipe_fd[0], &c, 1);
ret = read_buf(fds[0], &c, 1);
if (ret == 1 && c == '1') {
ret = write_pid_idmaps(pid, head);
if (!ret) {
@ -504,11 +518,15 @@ userns_fd_from_idmap(list_t *head)
} else {
fd = -ret;
}
/* Let child know it can exit */
(void) write_buf(fds[0], "1", 1);
} else {
fd = -EBADF;
}
close(pipe_fd[0]);
(void) wait_for_pid(pid);
out:
close(fds[0]);
close(fds[1]);
return (fd);
}
@ -532,7 +550,8 @@ is_idmap_supported(char *path)
};
/* strtok_r() won't be happy with a const string */
char *input = strdup("b:0:1000000:1000000");
/* To check if idmapped mount can be done in a user ns, map 0 to 0 */
char *input = strdup("b:0:0:1");
if (!input) {
errno = ENOMEM;

3
tests/zfs-tests/tests/Makefile.am
View File

@ -2006,4 +2006,5 @@ nobase_dist_datadir_zfs_tests_tests_SCRIPTS += \
functional/idmap_mount/idmap_mount_001.ksh \
functional/idmap_mount/idmap_mount_002.ksh \
functional/idmap_mount/idmap_mount_003.ksh \
functional/idmap_mount/idmap_mount_004.ksh
functional/idmap_mount/idmap_mount_004.ksh \
functional/idmap_mount/idmap_mount_005.ksh

138
tests/zfs-tests/tests/functional/idmap_mount/idmap_mount_005.ksh Executable file
View File

@ -0,0 +1,138 @@
#!/bin/ksh -p
#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License (the "License").
# You may not use this file except in compliance with the License.
#
# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
# or https://opensource.org/licenses/CDDL-1.0.
# See the License for the specific language governing permissions
# and limitations under the License.
#
# When distributing Covered Code, include this CDDL HEADER in each
# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
# If applicable, add the following below this CDDL HEADER, with the
# fields enclosed by brackets "[]" replaced with your own identifying
# information: Portions Copyright [yyyy] [name of copyright owner]
#
# CDDL HEADER END
#
. $STF_SUITE/tests/functional/idmap_mount/idmap_mount_common.kshlib
#
#
# DESCRIPTION:
# Test idmapped mount in a user namespace
#
# STRATEGY:
# 1. Create a zoned dataset
# 2. Create a user namespace and designate the dataset to the zone
# 3. In the zone, mount the dataset to "idmap_test"
# 4. In the zone, idmap mount the dataset mountpoint to "idmap_dest"
# 5. Do some file operations in the idmapped mountpoint "idmap_dest"
# 6. Check the owner of files/folder in the mount point "idmap_test"
# 7. unmount the mountpoints in the zone
# 8. Remount the dataset in global zone to "idmap_test"
# 9. Check the owenr of filers/folder in the mountpoint "idmap_test"
#
verify_runnable "global"
export WORKDIR=$TESTDIR/idmap_test
export IDMAPDIR=$TESTDIR/idmap_dest
function cleanup
{
if [[ -v unshared_pid ]]; then
zfs unzone /proc/$unshared_pid/ns/user "$TESTPOOL/userns"
kill -TERM ${unshared_pid}
fi
if mountpoint $WORKDIR; then
log_must umount $WORKDIR
fi
log_must rm -rf $WORKDIR
}
log_onexit cleanup
if ! idmap_util -c $TESTDIR; then
log_unsupported "Idmap mount not supported."
fi
unshare -Urm echo test
if [ "$?" -ne "0" ]; then
log_unsupported "Failed to create user namespace"
fi
log_must zfs create -o zoned=off -o mountpoint=$WORKDIR "$TESTPOOL/userns"
# "root" user and group in the user ns
log_must chown 1000000:1000000 $WORKDIR
log_must zfs set zoned=on "$TESTPOOL/userns"
log_must mkdir -p $IDMAPDIR
unshare -Um /usr/bin/sleep 2h &
unshared_pid=$!
if [ "$?" -ne "0" ]; then
log_unsupported "Failed to create user namespace"
fi
# wait for userns to be ready
sleep 1
echo "0 1000000 1000000" > /proc/$unshared_pid/uid_map
if [ "$?" -ne "0" ]; then
log_unsupported "Failed to write to uid_map"
fi
echo "0 1000000 1000000" > /proc/$unshared_pid/gid_map
if [ "$?" -ne "0" ]; then
log_unsupported "Failed to write to gid_map"
fi
NSENTER="nsenter -t $unshared_pid --all -S 0 -G 0"
log_must zfs zone /proc/$unshared_pid/ns/user "$TESTPOOL/userns"
log_must $NSENTER zfs mount "$TESTPOOL/userns"
log_must $NSENTER chmod 777 $WORKDIR
$NSENTER idmap_util -c $WORKDIR
if [ "$?" -ne "0" ]; then
log_unsupported "Idmapped mount not supported in a user namespace"
fi
log_must $NSENTER idmap_util -m b:0:10000:100000 $WORKDIR $IDMAPDIR
log_must $NSENTER setpriv --reuid 11000 --regid 11000 --clear-groups touch $IDMAPDIR/file
log_must $NSENTER setpriv --reuid 11000 --regid 11000 --clear-groups mkdir $IDMAPDIR/folder
log_must $NSENTER setpriv --reuid 11000 --regid 11000 --clear-groups ln -s file $IDMAPDIR/file-soft
log_must $NSENTER setpriv --reuid 11000 --regid 11000 --clear-groups ln $IDMAPDIR/file $IDMAPDIR/file-hard
log_must $NSENTER setpriv --reuid 11000 --regid 11000 --clear-groups cp -p $IDMAPDIR/file $IDMAPDIR/folder/file-p
log_must $NSENTER setpriv --reuid 11000 --regid 11000 --clear-groups cp $IDMAPDIR/file $IDMAPDIR/folder/file
log_must test "1000 1000" = "$($NSENTER stat -c '%u %g' $WORKDIR/file)"
log_must test "1000 1000" = "$($NSENTER stat -c '%u %g' $WORKDIR/folder)"
log_must test "1000 1000" = "$($NSENTER stat -c '%u %g' $WORKDIR/file-soft)"
log_must test "1000 1000" = "$($NSENTER stat -c '%u %g' $WORKDIR/file-hard)"
log_must test "1000 1000" = "$($NSENTER stat -c '%u %g' $WORKDIR/folder/file-p)"
log_must test "1000 1000" = "$($NSENTER stat -c '%u %g' $WORKDIR/folder/file)"
log_must $NSENTER umount $IDMAPDIR
log_must $NSENTER umount $WORKDIR
log_must zfs unzone /proc/$unshared_pid/ns/user "$TESTPOOL/userns"
log_must kill -TERM $unshared_pid
unset unshared_pid
log_must zfs set zoned=off "$TESTPOOL/userns"
log_must zfs mount "$TESTPOOL/userns"
log_must test "1001000 1001000" = "$(stat -c '%u %g' $WORKDIR/file)"
log_must test "1001000 1001000" = "$(stat -c '%u %g' $WORKDIR/folder)"
log_must test "1001000 1001000" = "$(stat -c '%u %g' $WORKDIR/file-soft)"
log_must test "1001000 1001000" = "$(stat -c '%u %g' $WORKDIR/file-hard)"
log_must test "1001000 1001000" = "$(stat -c '%u %g' $WORKDIR/folder/file-p)"
log_must test "1001000 1001000" = "$(stat -c '%u %g' $WORKDIR/folder/file)"
log_pass "Testing idmapped mount in a user ns is successful."