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 $mdstart 64bsdlabel -w md$mdstart auto 65newfs $newfs_flags -n md$mdstart > /dev/null 66mount /dev/md$mdstart $mntpoint 67set +e 68 69cd $mntpoint 70dd if=/dev/random of=input bs=4k count=100 status=none 71 72(cd $odir/../testcases/swap; ./swap -t 5m -i 20 -l 100 > /dev/null) & 73sleep 30 74n=1 75start=` date +%s` 76while [ $((` date +%s` - start)) -lt 180 ]; do 77 rm -f output 78# The umount is needed to trigger the short read error 79 umount $mntpoint 2>/dev/null # busy umount 80 $dir/sendfile21 81 s=$? 82 cmp -s input output || break 83 [ `stat -f '%z' input` -ne ` stat -f '%z' output` ] && break 84 n=$((n + 1)) 85done 86while pgrep -q swap; do 87 pkill swap 88done 89cmp -s input output || { echo "Loop #$n"; ls -l; s=1; } 90wait 91[ -f sendfile21.core -a $s -eq 0 ] && 92 { ls -l sendfile21.core; mv sendfile21.core $dir; s=1; } 93cd $odir 94 95for i in `jot 6`; do 96 mount | grep -q "on $mntpoint " || break 97 umount $mntpoint && break || sleep 10 98 [ $i -eq 6 ] && 99 { echo FATAL; fstat -mf $mntpoint; exit 1; } 100done 101mdconfig -d -u $mdstart 102rm -rf $dir/sendfile21 103exit $s 104 105EOF 106#include <sys/param.h> 107#include <sys/fcntl.h> 108#include <sys/mman.h> 109#include <sys/socket.h> 110#include <sys/stat.h> 111#include <sys/uio.h> 112#include <sys/wait.h> 113 114#include <err.h> 115#include <errno.h> 116#include <fcntl.h> 117#include <stdio.h> 118#include <stdlib.h> 119#include <unistd.h> 120 121#define DEBUG 1 122 123static void 124test(void) 125{ 126 struct stat st; 127 off_t i, j, k __unused, rd, written, pos; 128 pid_t pid; 129 int error, from, n, status, sv[2], to; 130 char buf[4086], *cp; 131 const char *from_name, *to_name; 132 133 from_name = "input"; 134 to_name = "output"; 135 136 if ((error = socketpair(AF_UNIX, SOCK_STREAM, 0, sv)) == -1) 137 err(1, "socketpair"); 138 139 if ((from = open(from_name, O_RDONLY)) == -1) 140 err(1, "open read %s", from_name); 141 142 if ((error = fstat(from, &st)) == -1) 143 err(1, "stat %s", from_name); 144 145 pid = fork(); 146 if (pid == -1) 147 err(1, "fork"); 148 else if (pid != 0) { 149 setproctitle("parent"); 150 close(sv[1]); 151 152 if ((cp = mmap(NULL, st.st_size, PROT_READ, 153 MAP_PRIVATE, from, 0)) == MAP_FAILED) 154 err(1, "mmap"); 155 if (fsync(from) == -1) 156 err(1, "fsync()"); 157 158 for (i = 0; i < st.st_size; i += PAGE_SIZE) 159 k = cp[i]; /* touch all pages */ 160 161 for (i = 0, j = 0; i < st.st_size; i += PAGE_SIZE, j++) { 162 if (j % 2 == 1) { 163 if (msync(cp + i, PAGE_SIZE, MS_INVALIDATE) 164 == -1) 165 err(1, "msync(), j = %d", (int)j); 166 } 167 } 168 if (munmap(cp, st.st_size) == -1) 169 err(1, "munmap()"); 170 171 pos = 0; 172 for (;;) { 173 error = sendfile(from, sv[0], pos, st.st_size - pos, 174 NULL, &written, 0); 175 if (error == -1) 176 err(1, "sendfile"); 177 if (written != st.st_size) 178 fprintf(stderr, "sendfile sent %d bytes\n", 179 (int)written); 180 pos += written; 181 if (pos == st.st_size) 182 break; 183 } 184 close(sv[0]); 185 if (pos != st.st_size) 186 fprintf(stderr, "%d written, expected %d\n", 187 (int) pos, (int)st.st_size); 188 if (waitpid(pid, &status, 0) != pid) 189 err(1, "waitpid(%d)", pid); 190 _exit(WEXITSTATUS(status)); 191 } else { 192 setproctitle("child"); 193 close(from); 194 close(sv[0]); 195 196 if ((to = open(to_name, O_RDWR | O_CREAT, DEFFILEMODE)) == 197 -1) 198 err(1, "open write %s", to_name); 199 200 rd = 0; 201 for (;;) { 202 n = read(sv[1], buf, sizeof(buf)); 203 if (n == -1) 204 err(1, "read"); 205 else if (n == 0) 206 break; 207 rd += n; 208 if (write(to, buf, n) != n) 209 err(1, "write()"); 210 } 211 close(to); 212 close(sv[1]); 213 if (rd != st.st_size) 214 fprintf(stderr, "Short read %d, expected %d\n", 215 (int)rd, (int)st.st_size); 216 _exit(0); 217 } 218 _exit(0); 219} 220 221int 222main(void) 223{ 224 pid_t pid; 225 int e, status; 226 227 e = 0; 228 if ((pid = fork()) == 0) 229 test(); 230 if (pid == -1) 231 err(1, "fork()"); 232 if (waitpid(pid, &status, 0) == -1) 233 err(1, "waitpid(%d)", pid); 234 if (status != 0) { 235 if (WIFSIGNALED(status)) 236 fprintf(stderr, 237 "pid %d exit signal %d\n", 238 pid, WTERMSIG(status)); 239 } 240 e += status == 0 ? 0 : 1; 241 242 return (e); 243} 244