1#!/bin/sh 2 3# 4# SPDX-License-Identifier: BSD-2-Clause-FreeBSD 5# 6# Copyright (c) 2019 Dell EMC Isilon 7# 8# Redistribution and use in source and binary forms, with or without 9# modification, are permitted provided that the following conditions 10# are met: 11# 1. Redistributions of source code must retain the above copyright 12# notice, this list of conditions and the following disclaimer. 13# 2. Redistributions in binary form must reproduce the above copyright 14# notice, this list of conditions and the following disclaimer in the 15# documentation and/or other materials provided with the distribution. 16# 17# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27# SUCH DAMAGE. 28# 29 30# Test scenario for "D20947: Check and avoid overflow when incrementing 31# fp->f_count in fget_unlocked() and fhold()". 32 33# OOM killing seen. Cap files and procs for now. 34 35. ../default.cfg 36 37dir=/tmp 38odir=`pwd` 39cd $dir 40rm -f /tmp/dup /tmp/dup.c || exit 1 41sed '1,/^EOF/d' < $odir/$0 > $dir/dup.c 42mycc -o dup -Wall -Wextra dup.c || exit 1 43rm -f dup.c 44cd $odir 45 46/tmp/dup; s=$? 47 48rm -f /tmp/dup 49exit $s 50 51EOF 52#include <sys/param.h> 53#include <sys/mman.h> 54#include <sys/stat.h> 55#include <sys/wait.h> 56 57#include <fcntl.h> 58#include <err.h> 59#include <errno.h> 60#include <stdlib.h> 61#include <stdio.h> 62#include <unistd.h> 63 64static volatile u_int *share; 65#define N 10240 66#define CAP_FILES 50000 67#define CAP_PROCS 1000 68#define SYNC 0 69 70int 71main(void) 72{ 73 struct stat st; 74 pid_t pid[N]; 75 size_t len; 76 int fd, fd2, i, j, last; 77 78 len = PAGE_SIZE; 79 if ((share = mmap(NULL, len, PROT_READ | PROT_WRITE, 80 MAP_ANON | MAP_SHARED, -1, 0)) == MAP_FAILED) 81 err(1, "mmap"); 82 if ((fd = open("/dev/zero", O_RDONLY)) == -1) 83 err(1, "open(/dev/zero)"); 84 i = 0; 85 for (;;) { 86 if ((fd2 = dup(fd)) == -1) { 87 if (errno == EMFILE) 88 break; 89 err(1, "dup()"); 90 } 91 last = fd2; 92 if (++i == CAP_FILES) 93 break; 94 } 95#if defined(DEBUG) 96 fprintf(stderr, "i = %d\n", i); 97#endif 98 99 for (i = 0; i < N; i++) { 100 if ((pid[i] = fork()) == 0) { 101 if (fstat(last, &st) == -1) 102 err(1, "stat(%s)", "/dev/zero"); 103 while(share[SYNC] == 0) 104 usleep(100000); 105 _exit(0); 106 } 107 if (pid[i] == -1) { 108 warn("fork()"); 109 i--; 110 break; 111 } 112 if (i + 1 == CAP_PROCS) 113 break; 114 } 115 share[SYNC] = 1; 116 for (j = 0; j < i; j++) { 117 if (waitpid(pid[j], NULL, 0) != pid[j]) 118 err(1, "waitpid(%d), index %d", pid[j], j); 119 } 120 121 return (0); 122} 123