1 /* $OpenBSD: sgidexec.c,v 1.2 2021/12/13 16:56:50 deraadt 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/proc.h> 9 #include <sys/sysctl.h> 10 #include <sys/wait.h> 11 12 #include <err.h> 13 #include <stdio.h> 14 #include <stdlib.h> 15 #include <string.h> 16 #include <pwd.h> 17 #include <unistd.h> 18 19 #include "setuid_regress.h" 20 21 int 22 main(int argc, char *argv[]) 23 { 24 struct kinfo_proc kproc; 25 char *toexec = NULL; 26 27 if (argc > 1) { 28 argv++; 29 if ((toexec = strdup(argv[0])) == NULL) 30 err(1, "strdup"); 31 } 32 33 if (read_kproc_pid(&kproc, getpid()) == -1) 34 err(1, "kproc read failed"); 35 36 if (issetugid() != 1) 37 errx(1, "process not marked as issetugid()"); 38 39 if (!(kproc.p_psflags & PS_SUGID)) 40 errx(1, "PS_SUGID not set"); 41 if (!(kproc.p_psflags & PS_SUGIDEXEC)) 42 errx(1, "PS_SUGIDEXEC not set"); 43 44 if (toexec != NULL) 45 if (execv(toexec, argv) == -1) 46 err(1, "exec of %s failed", toexec); 47 free(toexec); 48 49 exit(0); 50 } 51