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/* $OpenBSD: setresgid_saved_exec.c,v 1.3 2021/12/15 18:42:38 anton Exp $ */
/*
* Written by Bret Stephen Lambert <blambert@openbsd.org> 2014
* Public Domain.
*/
#include <sys/types.h>
#include <sys/signal.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <sys/wait.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pwd.h>
#include <unistd.h>
#include "setuid_regress.h"
int
main(int argc, char *argv[])
{
struct kinfo_proc kproc;
struct passwd *pw;
char *toexec = NULL;
gid_t gid;
if (argc > 1) {
argv++;
if ((toexec = strdup(argv[0])) == NULL)
err(1, "strdup");
}
gid = getgid();
if ((pw = getpwnam(_SETUID_REGRESS_USER)) == NULL)
err(1, "unknown user \"%s\"", _SETUID_REGRESS_USER);
if (setresgid(-1, -1, pw->pw_gid) == -1)
err(1, "setgid");
checkgids(gid, gid, pw->pw_gid, "setgid");
if (issetugid())
errx(1, "process incorrectly marked as issetugid()");
if (read_kproc_pid(&kproc, getpid()) == -1)
err(1, "kproc read failed");
if (!(kproc.p_psflags & PS_SUGID))
errx(1, "PS_SUGID not set");
if (kproc.p_psflags & PS_SUGIDEXEC)
errx(1, "PS_SUGIDEXEC incorrectly set");
if (toexec != NULL)
if (execv(toexec, argv) == -1)
err(1, "exec of %s failed", toexec);
free(toexec);
exit(0);
}
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