Commit a29c33f4 authored by Eric W. Biederman's avatar Eric W. Biederman
Browse files

userns: Convert setting and getting uid and gid system calls to use kuid and kgid 



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: default avatarEric W. Biederman <ebiederm@xmission.com>
parent 18815a18

kernel/exit.c

+3 −3
Original line number Diff line number Diff line
@@ -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);

kernel/sys.c

+149 −67
Original line number Diff line number Diff line
@@ -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;



	if (!(retval   = put_user(cred->uid,  ruid)) &&

	    !(retval   = put_user(cred->euid, euid)))

		retval = put_user(cred->suid, 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(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;

		}

	}

kernel/timer.c

+4 −4
Original line number Diff line number Diff line
@@ -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

kernel/uid16.c

+22 −12
Original line number Diff line number Diff line
@@ -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()));

}

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