1 /* $OpenBSD: sgidexec.c,v 1.3 2021/12/15 18:42:38 anton Exp $ */ 2 /* 3 * Written by Bret Stephen Lambert <blambert@openbsd.org> 2014 4 * Public Domain. 5 */ 6 7 #include <sys/types.h> 8 #include <sys/signal.h> 9 #include <sys/proc.h> 10 #include <sys/sysctl.h> 11 #include <sys/wait.h> 12 13 #include <err.h> 14 #include <stdio.h> 15 #include <stdlib.h> 16 #include <string.h> 17 #include <pwd.h> 18 #include <unistd.h> 19 20 #include "setuid_regress.h" 21 22 int 23 main(int argc, char *argv[]) 24 { 25 struct kinfo_proc kproc; 26 char *toexec = NULL; 27 28 if (argc > 1) { 29 argv++; 30 if ((toexec = strdup(argv[0])) == NULL) 31 err(1, "strdup"); 32 } 33 34 if (read_kproc_pid(&kproc, getpid()) == -1) 35 err(1, "kproc read failed"); 36 37 if (issetugid() != 1) 38 errx(1, "process not marked as issetugid()"); 39 40 if (!(kproc.p_psflags & PS_SUGID)) 41 errx(1, "PS_SUGID not set"); 42 if (!(kproc.p_psflags & PS_SUGIDEXEC)) 43 errx(1, "PS_SUGIDEXEC not set"); 44 45 if (toexec != NULL) 46 if (execv(toexec, argv) == -1) 47 err(1, "exec of %s failed", toexec); 48 free(toexec); 49 50 exit(0); 51 } 52