1#!/bin/sh 2 3# 4# Copyright (c) 2016 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# A regression test for r302919. 30# Triggered a witness message: 31# 32# vmspace_free() called with the following non-sleepable locks held: 33# shared rw vm object (vm object) r = 0 locked @ kern/sys_process.c:432 34 35. ../default.cfg 36 37dir=/tmp 38odir=`pwd` 39cd $dir 40sed '1,/^EOF/d' < $odir/$0 > $dir/ptrace8.c 41mycc -o ptrace8 -Wall -Wextra -O0 -g ptrace8.c || exit 1 42rm -f ptrace8.c 43cd $odir 44 45/tmp/ptrace8 46s=$? 47 48rm -rf /tmp/ptrace8 49exit $s 50 51EOF 52#include <sys/param.h> 53#include <sys/mman.h> 54#include <sys/ptrace.h> 55#include <sys/stat.h> 56#include <sys/wait.h> 57 58#include <machine/atomic.h> 59 60#include <err.h> 61#include <errno.h> 62#include <fcntl.h> 63#include <stdio.h> 64#include <stdlib.h> 65#include <time.h> 66#include <unistd.h> 67 68volatile u_int *share; 69 70#define SYNC 0 71 72int 73main(void) 74{ 75 struct ptrace_vm_entry ent; 76 size_t len; 77 int pid, r, status; 78 char path[MAXPATHLEN + 1]; 79 80 len = PAGE_SIZE; 81 if ((share = mmap(NULL, len, PROT_READ | PROT_WRITE, 82 MAP_ANON | MAP_SHARED, -1, 0)) == MAP_FAILED) 83 err(1, "mmap"); 84 85 if ((pid = fork()) == 0) { 86 while (share[SYNC] == 0) 87 sleep(1); 88 89 _exit(0); 90 } 91 92 if (ptrace(PT_ATTACH, pid, 0, 0) == -1) 93 err(1, "ptrace"); 94 95 if (waitpid(pid, &status, 0) == -1) 96 err(1, "waitpid"); 97 else if (!WIFSTOPPED(status)) 98 errx(1, "failed to stop child"); 99 100 ent.pve_entry = 0; 101 ent.pve_path = path; 102 ent.pve_pathlen = sizeof(path); 103 do { 104 r = ptrace(PT_VM_ENTRY, pid, (caddr_t)&ent, 0); 105#if defined(DEBUG) 106 if (r == 0) 107 fprintf(stderr, "path = %s 0x%lx - 0x%lx\n", 108 ent.pve_path, ent.pve_start, ent.pve_end); 109#endif 110 } while (r == 0); 111 if (r == -1 && errno != ENOENT) 112 err(1, "ptrace(PT_VM_ENTRY)"); 113 114 share[SYNC] = 1; 115 if (ptrace(PT_DETACH, pid, 0, 0) == -1) 116 err(1, "ptrace"); 117 118 if (waitpid(pid, &status, 0) == -1) 119 err(1, "waitpid(%d)", pid); 120 121 return (status != 0); 122} 123