Re: [PATCH 23/43] userns: Convert setting and getting uid and gid system calls to use kuid and kgid

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Quoting Eric W. Beiderman (ebiederm@xxxxxxxxxxxx):
> From: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
> 
> Convert setregid, setgid, setreuid, setuid,
> setresuid, getresuid, setresgid, getresgid, setfsuid, setfsgid,
> getuid, geteuid, getgid, getegid,
> waitpid, waitid, wait4.
> 
> Convert userspace uids and gids into kuids and kgids before
> being placed on struct cred.  Convert struct cred kuids and
> kgids into userspace uids and gids when returning them.
> 
> Signed-off-by: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>

Acked-by: Serge Hallyn <serge.hallyn@xxxxxxxxxxxxx>

> ---
>  kernel/exit.c  |    6 +-
>  kernel/sys.c   |  216 ++++++++++++++++++++++++++++++++++++++-----------------
>  kernel/timer.c |    8 +-
>  kernel/uid16.c |   34 ++++++---
>  4 files changed, 178 insertions(+), 86 deletions(-)
> 
> diff --git a/kernel/exit.c b/kernel/exit.c
> index d8bd3b42..789e3c5 100644
> --- a/kernel/exit.c
> +++ b/kernel/exit.c
> @@ -1214,7 +1214,7 @@ static int wait_task_zombie(struct wait_opts *wo, struct task_struct *p)
>  	unsigned long state;
>  	int retval, status, traced;
>  	pid_t pid = task_pid_vnr(p);
> -	uid_t uid = __task_cred(p)->uid;
> +	uid_t uid = from_kuid_munged(current_user_ns(), __task_cred(p)->uid);
>  	struct siginfo __user *infop;
>  
>  	if (!likely(wo->wo_flags & WEXITED))
> @@ -1427,7 +1427,7 @@ static int wait_task_stopped(struct wait_opts *wo,
>  	if (!unlikely(wo->wo_flags & WNOWAIT))
>  		*p_code = 0;
>  
> -	uid = task_uid(p);
> +	uid = from_kuid_munged(current_user_ns(), __task_cred(p)->uid);
>  unlock_sig:
>  	spin_unlock_irq(&p->sighand->siglock);
>  	if (!exit_code)
> @@ -1500,7 +1500,7 @@ static int wait_task_continued(struct wait_opts *wo, struct task_struct *p)
>  	}
>  	if (!unlikely(wo->wo_flags & WNOWAIT))
>  		p->signal->flags &= ~SIGNAL_STOP_CONTINUED;
> -	uid = task_uid(p);
> +	uid = from_kuid_munged(current_user_ns(), __task_cred(p)->uid);
>  	spin_unlock_irq(&p->sighand->siglock);
>  
>  	pid = task_pid_vnr(p);
> diff --git a/kernel/sys.c b/kernel/sys.c
> index 3996281..aff09f2 100644
> --- a/kernel/sys.c
> +++ b/kernel/sys.c
> @@ -555,9 +555,19 @@ void ctrl_alt_del(void)
>   */
>  SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid)
>  {
> +	struct user_namespace *ns = current_user_ns();
>  	const struct cred *old;
>  	struct cred *new;
>  	int retval;
> +	kgid_t krgid, kegid;
> +
> +	krgid = make_kgid(ns, rgid);
> +	kegid = make_kgid(ns, egid);
> +
> +	if ((rgid != (gid_t) -1) && !gid_valid(krgid))
> +		return -EINVAL;
> +	if ((egid != (gid_t) -1) && !gid_valid(kegid))
> +		return -EINVAL;
>  
>  	new = prepare_creds();
>  	if (!new)
> @@ -566,25 +576,25 @@ SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid)
>  
>  	retval = -EPERM;
>  	if (rgid != (gid_t) -1) {
> -		if (old->gid == rgid ||
> -		    old->egid == rgid ||
> +		if (gid_eq(old->gid, krgid) ||
> +		    gid_eq(old->egid, krgid) ||
>  		    nsown_capable(CAP_SETGID))
> -			new->gid = rgid;
> +			new->gid = krgid;
>  		else
>  			goto error;
>  	}
>  	if (egid != (gid_t) -1) {
> -		if (old->gid == egid ||
> -		    old->egid == egid ||
> -		    old->sgid == egid ||
> +		if (gid_eq(old->gid, kegid) ||
> +		    gid_eq(old->egid, kegid) ||
> +		    gid_eq(old->sgid, kegid) ||
>  		    nsown_capable(CAP_SETGID))
> -			new->egid = egid;
> +			new->egid = kegid;
>  		else
>  			goto error;
>  	}
>  
>  	if (rgid != (gid_t) -1 ||
> -	    (egid != (gid_t) -1 && egid != old->gid))
> +	    (egid != (gid_t) -1 && !gid_eq(kegid, old->gid)))
>  		new->sgid = new->egid;
>  	new->fsgid = new->egid;
>  
> @@ -602,9 +612,15 @@ error:
>   */
>  SYSCALL_DEFINE1(setgid, gid_t, gid)
>  {
> +	struct user_namespace *ns = current_user_ns();
>  	const struct cred *old;
>  	struct cred *new;
>  	int retval;
> +	kgid_t kgid;
> +
> +	kgid = make_kgid(ns, gid);
> +	if (!gid_valid(kgid))
> +		return -EINVAL;
>  
>  	new = prepare_creds();
>  	if (!new)
> @@ -613,9 +629,9 @@ SYSCALL_DEFINE1(setgid, gid_t, gid)
>  
>  	retval = -EPERM;
>  	if (nsown_capable(CAP_SETGID))
> -		new->gid = new->egid = new->sgid = new->fsgid = gid;
> -	else if (gid == old->gid || gid == old->sgid)
> -		new->egid = new->fsgid = gid;
> +		new->gid = new->egid = new->sgid = new->fsgid = kgid;
> +	else if (gid_eq(kgid, old->gid) || gid_eq(kgid, old->sgid))
> +		new->egid = new->fsgid = kgid;
>  	else
>  		goto error;
>  
> @@ -672,9 +688,19 @@ static int set_user(struct cred *new)
>   */
>  SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid)
>  {
> +	struct user_namespace *ns = current_user_ns();
>  	const struct cred *old;
>  	struct cred *new;
>  	int retval;
> +	kuid_t kruid, keuid;
> +
> +	kruid = make_kuid(ns, ruid);
> +	keuid = make_kuid(ns, euid);
> +
> +	if ((ruid != (uid_t) -1) && !uid_valid(kruid))
> +		return -EINVAL;
> +	if ((euid != (uid_t) -1) && !uid_valid(keuid))
> +		return -EINVAL;
>  
>  	new = prepare_creds();
>  	if (!new)
> @@ -683,29 +709,29 @@ SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid)
>  
>  	retval = -EPERM;
>  	if (ruid != (uid_t) -1) {
> -		new->uid = ruid;
> -		if (old->uid != ruid &&
> -		    old->euid != ruid &&
> +		new->uid = kruid;
> +		if (!uid_eq(old->uid, kruid) &&
> +		    !uid_eq(old->euid, kruid) &&
>  		    !nsown_capable(CAP_SETUID))
>  			goto error;
>  	}
>  
>  	if (euid != (uid_t) -1) {
> -		new->euid = euid;
> -		if (old->uid != euid &&
> -		    old->euid != euid &&
> -		    old->suid != euid &&
> +		new->euid = keuid;
> +		if (!uid_eq(old->uid, keuid) &&
> +		    !uid_eq(old->euid, keuid) &&
> +		    !uid_eq(old->suid, keuid) &&
>  		    !nsown_capable(CAP_SETUID))
>  			goto error;
>  	}
>  
> -	if (new->uid != old->uid) {
> +	if (!uid_eq(new->uid, old->uid)) {
>  		retval = set_user(new);
>  		if (retval < 0)
>  			goto error;
>  	}
>  	if (ruid != (uid_t) -1 ||
> -	    (euid != (uid_t) -1 && euid != old->uid))
> +	    (euid != (uid_t) -1 && !uid_eq(keuid, old->uid)))
>  		new->suid = new->euid;
>  	new->fsuid = new->euid;
>  
> @@ -733,9 +759,15 @@ error:
>   */
>  SYSCALL_DEFINE1(setuid, uid_t, uid)
>  {
> +	struct user_namespace *ns = current_user_ns();
>  	const struct cred *old;
>  	struct cred *new;
>  	int retval;
> +	kuid_t kuid;
> +
> +	kuid = make_kuid(ns, uid);
> +	if (!uid_valid(kuid))
> +		return -EINVAL;
>  
>  	new = prepare_creds();
>  	if (!new)
> @@ -744,17 +776,17 @@ SYSCALL_DEFINE1(setuid, uid_t, uid)
>  
>  	retval = -EPERM;
>  	if (nsown_capable(CAP_SETUID)) {
> -		new->suid = new->uid = uid;
> -		if (uid != old->uid) {
> +		new->suid = new->uid = kuid;
> +		if (!uid_eq(kuid, old->uid)) {
>  			retval = set_user(new);
>  			if (retval < 0)
>  				goto error;
>  		}
> -	} else if (uid != old->uid && uid != new->suid) {
> +	} else if (!uid_eq(kuid, old->uid) && !uid_eq(kuid, new->suid)) {
>  		goto error;
>  	}
>  
> -	new->fsuid = new->euid = uid;
> +	new->fsuid = new->euid = kuid;
>  
>  	retval = security_task_fix_setuid(new, old, LSM_SETID_ID);
>  	if (retval < 0)
> @@ -774,9 +806,24 @@ error:
>   */
>  SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid)
>  {
> +	struct user_namespace *ns = current_user_ns();
>  	const struct cred *old;
>  	struct cred *new;
>  	int retval;
> +	kuid_t kruid, keuid, ksuid;
> +
> +	kruid = make_kuid(ns, ruid);
> +	keuid = make_kuid(ns, euid);
> +	ksuid = make_kuid(ns, suid);
> +
> +	if ((ruid != (uid_t) -1) && !uid_valid(kruid))
> +		return -EINVAL;
> +
> +	if ((euid != (uid_t) -1) && !uid_valid(keuid))
> +		return -EINVAL;
> +
> +	if ((suid != (uid_t) -1) && !uid_valid(ksuid))
> +		return -EINVAL;
>  
>  	new = prepare_creds();
>  	if (!new)
> @@ -786,29 +833,29 @@ SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid)
>  
>  	retval = -EPERM;
>  	if (!nsown_capable(CAP_SETUID)) {
> -		if (ruid != (uid_t) -1 && ruid != old->uid &&
> -		    ruid != old->euid  && ruid != old->suid)
> +		if (ruid != (uid_t) -1        && !uid_eq(kruid, old->uid) &&
> +		    !uid_eq(kruid, old->euid) && !uid_eq(kruid, old->suid))
>  			goto error;
> -		if (euid != (uid_t) -1 && euid != old->uid &&
> -		    euid != old->euid  && euid != old->suid)
> +		if (euid != (uid_t) -1        && !uid_eq(keuid, old->uid) &&
> +		    !uid_eq(keuid, old->euid) && !uid_eq(keuid, old->suid))
>  			goto error;
> -		if (suid != (uid_t) -1 && suid != old->uid &&
> -		    suid != old->euid  && suid != old->suid)
> +		if (suid != (uid_t) -1        && !uid_eq(ksuid, old->uid) &&
> +		    !uid_eq(ksuid, old->euid) && !uid_eq(ksuid, old->suid))
>  			goto error;
>  	}
>  
>  	if (ruid != (uid_t) -1) {
> -		new->uid = ruid;
> -		if (ruid != old->uid) {
> +		new->uid = kruid;
> +		if (!uid_eq(kruid, old->uid)) {
>  			retval = set_user(new);
>  			if (retval < 0)
>  				goto error;
>  		}
>  	}
>  	if (euid != (uid_t) -1)
> -		new->euid = euid;
> +		new->euid = keuid;
>  	if (suid != (uid_t) -1)
> -		new->suid = suid;
> +		new->suid = ksuid;
>  	new->fsuid = new->euid;
>  
>  	retval = security_task_fix_setuid(new, old, LSM_SETID_RES);
> @@ -822,14 +869,19 @@ error:
>  	return retval;
>  }
>  
> -SYSCALL_DEFINE3(getresuid, uid_t __user *, ruid, uid_t __user *, euid, uid_t __user *, suid)
> +SYSCALL_DEFINE3(getresuid, uid_t __user *, ruidp, uid_t __user *, euidp, uid_t __user *, suidp)
>  {
>  	const struct cred *cred = current_cred();
>  	int retval;
> +	uid_t ruid, euid, suid;
> +
> +	ruid = from_kuid_munged(cred->user_ns, cred->uid);
> +	euid = from_kuid_munged(cred->user_ns, cred->euid);
> +	suid = from_kuid_munged(cred->user_ns, cred->suid);
>  
> -	if (!(retval   = put_user(cred->uid,  ruid)) &&
> -	    !(retval   = put_user(cred->euid, euid)))
> -		retval = put_user(cred->suid, suid);
> +	if (!(retval   = put_user(ruid, ruidp)) &&
> +	    !(retval   = put_user(euid, euidp)))
> +		retval = put_user(suid, suidp);
>  
>  	return retval;
>  }
> @@ -839,9 +891,22 @@ SYSCALL_DEFINE3(getresuid, uid_t __user *, ruid, uid_t __user *, euid, uid_t __u
>   */
>  SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid)
>  {
> +	struct user_namespace *ns = current_user_ns();
>  	const struct cred *old;
>  	struct cred *new;
>  	int retval;
> +	kgid_t krgid, kegid, ksgid;
> +
> +	krgid = make_kgid(ns, rgid);
> +	kegid = make_kgid(ns, egid);
> +	ksgid = make_kgid(ns, sgid);
> +
> +	if ((rgid != (gid_t) -1) && !gid_valid(krgid))
> +		return -EINVAL;
> +	if ((egid != (gid_t) -1) && !gid_valid(kegid))
> +		return -EINVAL;
> +	if ((sgid != (gid_t) -1) && !gid_valid(ksgid))
> +		return -EINVAL;
>  
>  	new = prepare_creds();
>  	if (!new)
> @@ -850,23 +915,23 @@ SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid)
>  
>  	retval = -EPERM;
>  	if (!nsown_capable(CAP_SETGID)) {
> -		if (rgid != (gid_t) -1 && rgid != old->gid &&
> -		    rgid != old->egid  && rgid != old->sgid)
> +		if (rgid != (gid_t) -1        && !gid_eq(krgid, old->gid) &&
> +		    !gid_eq(krgid, old->egid) && !gid_eq(krgid, old->sgid))
>  			goto error;
> -		if (egid != (gid_t) -1 && egid != old->gid &&
> -		    egid != old->egid  && egid != old->sgid)
> +		if (egid != (gid_t) -1        && !gid_eq(kegid, old->gid) &&
> +		    !gid_eq(kegid, old->egid) && !gid_eq(kegid, old->sgid))
>  			goto error;
> -		if (sgid != (gid_t) -1 && sgid != old->gid &&
> -		    sgid != old->egid  && sgid != old->sgid)
> +		if (sgid != (gid_t) -1        && !gid_eq(ksgid, old->gid) &&
> +		    !gid_eq(ksgid, old->egid) && !gid_eq(ksgid, old->sgid))
>  			goto error;
>  	}
>  
>  	if (rgid != (gid_t) -1)
> -		new->gid = rgid;
> +		new->gid = krgid;
>  	if (egid != (gid_t) -1)
> -		new->egid = egid;
> +		new->egid = kegid;
>  	if (sgid != (gid_t) -1)
> -		new->sgid = sgid;
> +		new->sgid = ksgid;
>  	new->fsgid = new->egid;
>  
>  	return commit_creds(new);
> @@ -876,14 +941,19 @@ error:
>  	return retval;
>  }
>  
> -SYSCALL_DEFINE3(getresgid, gid_t __user *, rgid, gid_t __user *, egid, gid_t __user *, sgid)
> +SYSCALL_DEFINE3(getresgid, gid_t __user *, rgidp, gid_t __user *, egidp, gid_t __user *, sgidp)
>  {
>  	const struct cred *cred = current_cred();
>  	int retval;
> +	gid_t rgid, egid, sgid;
> +
> +	rgid = from_kgid_munged(cred->user_ns, cred->gid);
> +	egid = from_kgid_munged(cred->user_ns, cred->egid);
> +	sgid = from_kgid_munged(cred->user_ns, cred->sgid);
>  
> -	if (!(retval   = put_user(cred->gid,  rgid)) &&
> -	    !(retval   = put_user(cred->egid, egid)))
> -		retval = put_user(cred->sgid, sgid);
> +	if (!(retval   = put_user(rgid, rgidp)) &&
> +	    !(retval   = put_user(egid, egidp)))
> +		retval = put_user(sgid, sgidp);
>  
>  	return retval;
>  }
> @@ -900,18 +970,24 @@ SYSCALL_DEFINE1(setfsuid, uid_t, uid)
>  	const struct cred *old;
>  	struct cred *new;
>  	uid_t old_fsuid;
> +	kuid_t kuid;
> +
> +	old = current_cred();
> +	old_fsuid = from_kuid_munged(old->user_ns, old->fsuid);
> +
> +	kuid = make_kuid(old->user_ns, uid);
> +	if (!uid_valid(kuid))
> +		return old_fsuid;
>  
>  	new = prepare_creds();
>  	if (!new)
> -		return current_fsuid();
> -	old = current_cred();
> -	old_fsuid = old->fsuid;
> +		return old_fsuid;
>  
> -	if (uid == old->uid  || uid == old->euid  ||
> -	    uid == old->suid || uid == old->fsuid ||
> +	if (uid_eq(kuid, old->uid)  || uid_eq(kuid, old->euid)  ||
> +	    uid_eq(kuid, old->suid) || uid_eq(kuid, old->fsuid) ||
>  	    nsown_capable(CAP_SETUID)) {
> -		if (uid != old_fsuid) {
> -			new->fsuid = uid;
> +		if (!uid_eq(kuid, old->fsuid)) {
> +			new->fsuid = kuid;
>  			if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0)
>  				goto change_okay;
>  		}
> @@ -933,18 +1009,24 @@ SYSCALL_DEFINE1(setfsgid, gid_t, gid)
>  	const struct cred *old;
>  	struct cred *new;
>  	gid_t old_fsgid;
> +	kgid_t kgid;
> +
> +	old = current_cred();
> +	old_fsgid = from_kgid_munged(old->user_ns, old->fsgid);
> +
> +	kgid = make_kgid(old->user_ns, gid);
> +	if (!gid_valid(kgid))
> +		return old_fsgid;
>  
>  	new = prepare_creds();
>  	if (!new)
> -		return current_fsgid();
> -	old = current_cred();
> -	old_fsgid = old->fsgid;
> +		return old_fsgid;
>  
> -	if (gid == old->gid  || gid == old->egid  ||
> -	    gid == old->sgid || gid == old->fsgid ||
> +	if (gid_eq(kgid, old->gid)  || gid_eq(kgid, old->egid)  ||
> +	    gid_eq(kgid, old->sgid) || gid_eq(kgid, old->fsgid) ||
>  	    nsown_capable(CAP_SETGID)) {
> -		if (gid != old_fsgid) {
> -			new->fsgid = gid;
> +		if (!gid_eq(kgid, old->fsgid)) {
> +			new->fsgid = kgid;
>  			goto change_okay;
>  		}
>  	}
> @@ -1503,10 +1585,10 @@ static int check_prlimit_permission(struct task_struct *task)
>  	if (cred->user_ns == tcred->user_ns &&
>  	    (cred->uid == tcred->euid &&
>  	     cred->uid == tcred->suid &&
> -	     cred->uid == tcred->uid  &&
> +	     cred->uid == tcred->uid &&
>  	     cred->gid == tcred->egid &&
>  	     cred->gid == tcred->sgid &&
> -	     cred->gid == tcred->gid))
> +		    cred->gid == tcred->gid))
>  		return 0;
>  	if (ns_capable(tcred->user_ns, CAP_SYS_RESOURCE))
>  		return 0;
> diff --git a/kernel/timer.c b/kernel/timer.c
> index a297ffc..67316cb 100644
> --- a/kernel/timer.c
> +++ b/kernel/timer.c
> @@ -1427,25 +1427,25 @@ SYSCALL_DEFINE0(getppid)
>  SYSCALL_DEFINE0(getuid)
>  {
>  	/* Only we change this so SMP safe */
> -	return current_uid();
> +	return from_kuid_munged(current_user_ns(), current_uid());
>  }
>  
>  SYSCALL_DEFINE0(geteuid)
>  {
>  	/* Only we change this so SMP safe */
> -	return current_euid();
> +	return from_kuid_munged(current_user_ns(), current_euid());
>  }
>  
>  SYSCALL_DEFINE0(getgid)
>  {
>  	/* Only we change this so SMP safe */
> -	return current_gid();
> +	return from_kgid_munged(current_user_ns(), current_gid());
>  }
>  
>  SYSCALL_DEFINE0(getegid)
>  {
>  	/* Only we change this so SMP safe */
> -	return  current_egid();
> +	return from_kgid_munged(current_user_ns(), current_egid());
>  }
>  
>  #endif
> diff --git a/kernel/uid16.c b/kernel/uid16.c
> index e530bc3..d7948eb 100644
> --- a/kernel/uid16.c
> +++ b/kernel/uid16.c
> @@ -81,14 +81,19 @@ SYSCALL_DEFINE3(setresuid16, old_uid_t, ruid, old_uid_t, euid, old_uid_t, suid)
>  	return ret;
>  }
>  
> -SYSCALL_DEFINE3(getresuid16, old_uid_t __user *, ruid, old_uid_t __user *, euid, old_uid_t __user *, suid)
> +SYSCALL_DEFINE3(getresuid16, old_uid_t __user *, ruidp, old_uid_t __user *, euidp, old_uid_t __user *, suidp)
>  {
>  	const struct cred *cred = current_cred();
>  	int retval;
> +	old_uid_t ruid, euid, suid;
>  
> -	if (!(retval   = put_user(high2lowuid(cred->uid),  ruid)) &&
> -	    !(retval   = put_user(high2lowuid(cred->euid), euid)))
> -		retval = put_user(high2lowuid(cred->suid), suid);
> +	ruid = high2lowuid(from_kuid_munged(cred->user_ns, cred->uid));
> +	euid = high2lowuid(from_kuid_munged(cred->user_ns, cred->euid));
> +	suid = high2lowuid(from_kuid_munged(cred->user_ns, cred->suid));
> +
> +	if (!(retval   = put_user(ruid, ruidp)) &&
> +	    !(retval   = put_user(euid, euidp)))
> +		retval = put_user(suid, suidp);
>  
>  	return retval;
>  }
> @@ -103,14 +108,19 @@ SYSCALL_DEFINE3(setresgid16, old_gid_t, rgid, old_gid_t, egid, old_gid_t, sgid)
>  }
>  
>  
> -SYSCALL_DEFINE3(getresgid16, old_gid_t __user *, rgid, old_gid_t __user *, egid, old_gid_t __user *, sgid)
> +SYSCALL_DEFINE3(getresgid16, old_gid_t __user *, rgidp, old_gid_t __user *, egidp, old_gid_t __user *, sgidp)
>  {
>  	const struct cred *cred = current_cred();
>  	int retval;
> +	old_gid_t rgid, egid, sgid;
> +
> +	rgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->gid));
> +	egid = high2lowgid(from_kgid_munged(cred->user_ns, cred->egid));
> +	sgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->sgid));
>  
> -	if (!(retval   = put_user(high2lowgid(cred->gid),  rgid)) &&
> -	    !(retval   = put_user(high2lowgid(cred->egid), egid)))
> -		retval = put_user(high2lowgid(cred->sgid), sgid);
> +	if (!(retval   = put_user(rgid, rgidp)) &&
> +	    !(retval   = put_user(egid, egidp)))
> +		retval = put_user(sgid, sgidp);
>  
>  	return retval;
>  }
> @@ -221,20 +231,20 @@ SYSCALL_DEFINE2(setgroups16, int, gidsetsize, old_gid_t __user *, grouplist)
>  
>  SYSCALL_DEFINE0(getuid16)
>  {
> -	return high2lowuid(current_uid());
> +	return high2lowuid(from_kuid_munged(current_user_ns(), current_uid()));
>  }
>  
>  SYSCALL_DEFINE0(geteuid16)
>  {
> -	return high2lowuid(current_euid());
> +	return high2lowuid(from_kuid_munged(current_user_ns(), current_euid()));
>  }
>  
>  SYSCALL_DEFINE0(getgid16)
>  {
> -	return high2lowgid(current_gid());
> +	return high2lowgid(from_kgid_munged(current_user_ns(), current_gid()));
>  }
>  
>  SYSCALL_DEFINE0(getegid16)
>  {
> -	return high2lowgid(current_egid());
> +	return high2lowgid(from_kgid_munged(current_user_ns(), current_egid()));
>  }
> -- 
> 1.7.2.5
> 
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