Function sys_setresuid

freebsd/kern/kern_prot.c:1019–1092

ARGSUSED */

#endif
/* ARGSUSED */
int
sys_setresuid(struct thread *td, struct setresuid_args *uap)
{
	struct proc *p = td->td_proc;
	struct ucred *newcred, *oldcred;
	uid_t euid, ruid, suid;
	struct uidinfo *euip, *ruip;
	int error;

	euid = uap->euid;
	ruid = uap->ruid;
	suid = uap->suid;
	AUDIT_ARG_EUID(euid);
	AUDIT_ARG_RUID(ruid);
	AUDIT_ARG_SUID(suid);
	newcred = crget();
	euip = uifind(euid);
	ruip = uifind(ruid);
	PROC_LOCK(p);
	oldcred = crcopysafe(p, newcred);

#ifdef MAC
	error = mac_cred_check_setresuid(oldcred, ruid, euid, suid);
	if (error)
		goto fail;
#endif

	if (((ruid != (uid_t)-1 && ruid != oldcred->cr_ruid &&
	     ruid != oldcred->cr_svuid &&
	      ruid != oldcred->cr_uid) ||
	     (euid != (uid_t)-1 && euid != oldcred->cr_ruid &&
	    euid != oldcred->cr_svuid &&
	      euid != oldcred->cr_uid) ||
	     (suid != (uid_t)-1 && suid != oldcred->cr_ruid &&
	    suid != oldcred->cr_svuid &&
	      suid != oldcred->cr_uid)) &&
	    (error = priv_check_cred(oldcred, PRIV_CRED_SETRESUID)) != 0)
		goto fail;

	if (euid != (uid_t)-1 && oldcred->cr_uid != euid) {
		change_euid(newcred, euip);
		setsugid(p);
	}
	if (ruid != (uid_t)-1 && oldcred->cr_ruid != ruid) {
		change_ruid(newcred, ruip);
		setsugid(p);
	}
	if (suid != (uid_t)-1 && oldcred->cr_svuid != suid) {
		change_svuid(newcred, suid);
		setsugid(p);
	}
	proc_set_cred(p, newcred);
#ifdef RACCT
	racct_proc_ucred_changed(p, oldcred, newcred);
	crhold(newcred);
#endif
	PROC_UNLOCK(p);
#ifdef RCTL