1#!/bin/sh 2 3# 4# SPDX-License-Identifier: BSD-2-Clause-FreeBSD 5# 6# Copyright (c) 2020 Peter Holm <pho@FreeBSD.org> 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# Konstantin Belousov <kib@FreeBSD.org> wrote: 31# 1. create a suffuciently large new file, e.g. of size 100 * PAGE_SIZE 32# 2. fill the file with some data, so no holes exist 33# 3. fsync it 34# 4. mmap the file 35# 5. for each odd-numbered page in the file, do msync(MS_INVALIDATE), 36# but keep even-numbered pages intact 37# 6. unmap the file 38# 7. sendfile the file to a receiver (similar to existing tests in stress2) 39# 8. compare received data with the content of file 40# 41# Without the fixes from r359767 and r359818, the kernel should panic or 42# supply incorrect data to the sendfile peer. 43 44# "Fatal trap 9: general protection fault while in kernel mode 45# (unp_dispose+0x99)" seen. 46# https://people.freebsd.org/~pho/stress/log/sendfile21.txt 47# Not seen on r359843 48 49. ../default.cfg 50[ `id -u` -ne 0 ] && echo "Must be root!" && exit 1 51 52dir=/tmp 53odir=`pwd` 54cd $dir 55sed '1,/^EOF/d' < $odir/$0 > $dir/sendfile21.c 56mycc -o sendfile21 -Wall -Wextra -O0 -g sendfile21.c || exit 1 57rm -f sendfile21.c 58cd $odir 59 60set -e 61mount | grep "on $mntpoint " | grep -q /dev/md && umount -f $mntpoint 62[ -c /dev/md$mdstart ] && mdconfig -d -u $mdstart 63mdconfig -a -t swap -s 1g -u $mdstart 64newfs $newfs_flags -n md$mdstart > /dev/null 65mount /dev/md$mdstart $mntpoint 66set +e 67 68cd $mntpoint 69dd if=/dev/random of=input bs=4k count=100 status=none 70 71(cd $odir/../testcases/swap; ./swap -t 5m -i 20 -l 100 > /dev/null) & 72sleep 30 73n=1 74start=` date +%s` 75while [ $((` date +%s` - start)) -lt 180 ]; do 76 rm -f output 77# The umount is needed to trigger the short read error 78 umount $mntpoint 2>/dev/null # busy umount 79 $dir/sendfile21 80 s=$? 81 cmp -s input output || break 82 [ `stat -f '%z' input` -ne ` stat -f '%z' output` ] && break 83 n=$((n + 1)) 84done 85while pgrep -q swap; do 86 pkill swap 87done 88cmp -s input output || { echo "Loop #$n"; ls -l; s=1; } 89wait 90[ -f sendfile21.core -a $s -eq 0 ] && 91 { ls -l sendfile21.core; mv sendfile21.core $dir; s=1; } 92cd $odir 93 94for i in `jot 6`; do 95 mount | grep -q "on $mntpoint " || break 96 umount $mntpoint && break || sleep 10 97 [ $i -eq 6 ] && 98 { echo FATAL; fstat -mf $mntpoint; exit 1; } 99done 100mdconfig -d -u $mdstart 101rm -rf $dir/sendfile21 102exit $s 103 104EOF 105#include <sys/param.h> 106#include <sys/fcntl.h> 107#include <sys/mman.h> 108#include <sys/socket.h> 109#include <sys/stat.h> 110#include <sys/uio.h> 111#include <sys/wait.h> 112 113#include <err.h> 114#include <errno.h> 115#include <fcntl.h> 116#include <stdio.h> 117#include <stdlib.h> 118#include <unistd.h> 119 120#define DEBUG 1 121 122static void 123test(void) 124{ 125 struct stat st; 126 off_t i, j, k __unused, rd, written, pos; 127 pid_t pid; 128 int error, from, n, status, sv[2], to; 129 char buf[4086], *cp; 130 const char *from_name, *to_name; 131 132 from_name = "input"; 133 to_name = "output"; 134 135 if ((error = socketpair(AF_UNIX, SOCK_STREAM, 0, sv)) == -1) 136 err(1, "socketpair"); 137 138 if ((from = open(from_name, O_RDONLY)) == -1) 139 err(1, "open read %s", from_name); 140 141 if ((error = fstat(from, &st)) == -1) 142 err(1, "stat %s", from_name); 143 144 pid = fork(); 145 if (pid == -1) 146 err(1, "fork"); 147 else if (pid != 0) { 148 setproctitle("parent"); 149 close(sv[1]); 150 151 if ((cp = mmap(NULL, st.st_size, PROT_READ, 152 MAP_PRIVATE, from, 0)) == MAP_FAILED) 153 err(1, "mmap"); 154 if (fsync(from) == -1) 155 err(1, "fsync()"); 156 157 for (i = 0; i < st.st_size; i += PAGE_SIZE) 158 k = cp[i]; /* touch all pages */ 159 160 for (i = 0, j = 0; i < st.st_size; i += PAGE_SIZE, j++) { 161 if (j % 2 == 1) { 162 if (msync(cp + i, PAGE_SIZE, MS_INVALIDATE) 163 == -1) 164 err(1, "msync(), j = %d", (int)j); 165 } 166 } 167 if (munmap(cp, st.st_size) == -1) 168 err(1, "munmap()"); 169 170 pos = 0; 171 for (;;) { 172 error = sendfile(from, sv[0], pos, st.st_size - pos, 173 NULL, &written, 0); 174 if (error == -1) 175 err(1, "sendfile"); 176 if (written != st.st_size) 177 fprintf(stderr, "sendfile sent %d bytes\n", 178 (int)written); 179 pos += written; 180 if (pos == st.st_size) 181 break; 182 } 183 close(sv[0]); 184 if (pos != st.st_size) 185 fprintf(stderr, "%d written, expected %d\n", 186 (int) pos, (int)st.st_size); 187 if (waitpid(pid, &status, 0) != pid) 188 err(1, "waitpid(%d)", pid); 189 _exit(WEXITSTATUS(status)); 190 } else { 191 setproctitle("child"); 192 close(from); 193 close(sv[0]); 194 195 if ((to = open(to_name, O_RDWR | O_CREAT, DEFFILEMODE)) == 196 -1) 197 err(1, "open write %s", to_name); 198 199 rd = 0; 200 for (;;) { 201 n = read(sv[1], buf, sizeof(buf)); 202 if (n == -1) 203 err(1, "read"); 204 else if (n == 0) 205 break; 206 rd += n; 207 if (write(to, buf, n) != n) 208 err(1, "write()"); 209 } 210 close(to); 211 close(sv[1]); 212 if (rd != st.st_size) 213 fprintf(stderr, "Short read %d, expected %d\n", 214 (int)rd, (int)st.st_size); 215 _exit(0); 216 } 217 _exit(0); 218} 219 220int 221main(void) 222{ 223 pid_t pid; 224 int e, status; 225 226 e = 0; 227 if ((pid = fork()) == 0) 228 test(); 229 if (pid == -1) 230 err(1, "fork()"); 231 if (waitpid(pid, &status, 0) == -1) 232 err(1, "waitpid(%d)", pid); 233 if (status != 0) { 234 if (WIFSIGNALED(status)) 235 fprintf(stderr, 236 "pid %d exit signal %d\n", 237 pid, WTERMSIG(status)); 238 } 239 e += status == 0 ? 0 : 1; 240 241 return (e); 242} 243