1#!/bin/sh 2 3# 4# Copyright (c) 2013 EMC Corp. 5# All rights reserved. 6# 7# Redistribution and use in source and binary forms, with or without 8# modification, are permitted provided that the following conditions 9# are met: 10# 1. Redistributions of source code must retain the above copyright 11# notice, this list of conditions and the following disclaimer. 12# 2. Redistributions in binary form must reproduce the above copyright 13# notice, this list of conditions and the following disclaimer in the 14# documentation and/or other materials provided with the distribution. 15# 16# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26# SUCH DAMAGE. 27# 28 29# Regression test for r241859: 30# Return EPERM if processes were found but they were unable to be signaled. 31 32[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1 33 34. ../default.cfg 35 36here=`pwd` 37cd /tmp 38sed '1,/^EOF/d' < $here/$0 > killpg.c 39mycc -o killpg -Wall -Wextra killpg.c || exit 1 40rm -f killpg.c 41 42/tmp/killpg 43 44rm -f /tmp/killpg 45exit 0 46EOF 47#include <sys/types.h> 48#include <sys/wait.h> 49 50#include <err.h> 51#include <errno.h> 52#include <fcntl.h> 53#include <pwd.h> 54#include <signal.h> 55#include <stdio.h> 56#include <stdlib.h> 57#include <unistd.h> 58 59static pid_t gid, pid; 60 61#define LOOPS 100 62 63static void 64hand(int i __unused) { /* handler */ 65 _exit(0); 66} 67 68static void 69nlooper(void) 70{ 71 int i; 72 73 setproctitle("nlooper"); 74 setpgrp(0, getpid()); 75 for (i = 0; i < LOOPS; i++) { 76 if ((pid = fork()) == 0) { 77 signal(SIGINFO, hand); 78 if (arc4random() % 100 < 10) 79 usleep(arc4random() % 100); 80 _exit(0); 81 } 82 wait(NULL); 83 } 84 _exit(0); 85} 86 87static void 88looper(void) 89{ 90 int i; 91 92 setproctitle("looper"); 93 setpgrp(0, getpid()); 94 for (i = 0; i < LOOPS; i++) { 95 if ((pid = fork()) == 0) { 96 signal(SIGINFO, hand); 97 if (arc4random() % 100 < 10) 98 usleep(arc4random() % 100); 99 _exit(0); 100 } 101 wait(NULL); 102 } 103 unlink("cont"); 104 _exit(0); 105} 106 107static void 108killer(void) 109{ 110 struct passwd *pw; 111 112 setproctitle("killer"); 113 if ((pw = getpwnam("nobody")) == NULL) 114 err(1, "no such user: nobody"); 115 116 if (setgroups(1, &pw->pw_gid) || 117 setegid(pw->pw_gid) || setgid(pw->pw_gid) || 118 seteuid(pw->pw_uid) || setuid(pw->pw_uid)) 119 err(1, "Can't drop privileges to \"nobody\""); 120 endpwent(); 121 122 if ((gid = fork()) == 0) 123 nlooper(); /* nobody looper */ 124 125 sleep(1); 126 while (access("cont", R_OK) == 0) { 127 if (killpg(gid, SIGINFO) == -1) { 128 if (errno == EPERM) 129 continue; 130 warn("FAIL killpg"); 131 } 132 } 133 _exit(0); 134} 135 136int 137main(void) 138{ 139 int fd; 140 141 if ((fd = open("cont", O_RDWR | O_CREAT, 0666)) == -1) 142 err(1, "creat"); 143 close(fd); 144 signal(SIGINFO, SIG_IGN); 145 146 if ((gid = fork()) == 0) 147 looper(); 148 if (fork() == 0) 149 killer(); 150 151 wait(NULL); 152 wait(NULL); 153 154 return (0); 155} 156