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/* $OpenBSD: cansig.c,v 1.1 2008/06/10 18:04:31 hshoexer Exp $ */
/* Written by Michael Shalayeff, 2008. Public Domain */
#include <sys/param.h>
#include <signal.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <err.h>
int
main()
{
pid_t pid;
int serrno;
if ((pid = fork()) < 0)
err(1, "fork");
/* nun sex */
if (!pid) {
if (seteuid(1))
err(1, "seteuid");
sleep(3);
return 0;
}
/* monk rock */
sleep(1);
/* first see if we can still do it */
if (kill(pid, 0)) {
serrno = errno;
kill(pid, SIGKILL);
errno = serrno;
err(1, "kill0");
}
if (setreuid(1, 1)) {
serrno = errno;
kill(pid, SIGKILL);
errno = serrno;
err(1, "seteuid1");
}
/* not allowed */
if (!kill(pid, 0))
errx(1, "kill1");
/* we can't collect the remains from the kiddo */
return 0;
}
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