linux-master/kernel/sys.c

173  * Returns true if current's euid is same as p's uid or euid,
182 	if (uid_eq(pcred->uid,  cred->euid) ||
183 	    uid_eq(pcred->euid, cred->euid))
529 long __sys_setreuid(uid_t ruid, uid_t euid)
538 	keuid = make_kuid(ns, euid);
542 	if ((euid != (uid_t) -1) && !uid_valid(keuid))
554 		    !uid_eq(old->euid, kruid) &&
559 	if (euid != (uid_t) -1) {
560 		new->euid = keuid;
562 		    !uid_eq(old->euid, keuid) &&
574 	    (euid != (uid_t) -1 && !uid_eq(keuid, old->uid)))
575 		new->suid = new->euid;
576 	new->fsuid = new->euid;
594 SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid)
596 	return __sys_setreuid(ruid, euid);
639 	new->fsuid = new->euid = kuid;
664  * This function implements a generic ability to update ruid, euid,
667 long __sys_setresuid(uid_t ruid, uid_t euid, uid_t suid)
677 	keuid = make_kuid(ns, euid);
683 	if ((euid != (uid_t) -1) && !uid_valid(keuid))
693 	    (euid == (uid_t) -1 || (uid_eq(keuid, old->euid) &&
699 		   !uid_eq(kruid, old->euid) && !uid_eq(kruid, old->suid);
700 	euid_new = euid != (uid_t) -1        && !uid_eq(keuid, old->uid) &&
701 		   !uid_eq(keuid, old->euid) && !uid_eq(keuid, old->suid);
703 		   !uid_eq(ksuid, old->euid) && !uid_eq(ksuid, old->suid);
720 	if (euid != (uid_t) -1)
721 		new->euid = keuid;
724 	new->fsuid = new->euid;
742 SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid)
744 	return __sys_setresuid(ruid, euid, suid);
751 	uid_t ruid, euid, suid;
754 	euid = from_kuid_munged(cred->user_ns, cred->euid);
759 		retval = put_user(euid, euidp);
860  * whatever uid it wants to). It normally shadows "euid", except when
881 	if (uid_eq(kuid, old->uid)  || uid_eq(kuid, old->euid)  ||
1672 	id_match = (uid_eq(cred->uid, tcred->euid) &&