/* $OpenBSD: setresgid_real_exec.c,v 1.1 2014/08/27 07:36:14 blambert Exp $ */ /* * Written by Bret Stephen Lambert <blambert@openbsd.org> 2014 * Public Domain. */ #include <sys/types.h> #include <sys/param.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(pw->pw_gid, -1, -1) == -1) err(1, "setgid"); checkgids(pw->pw_gid, gid, 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); }