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#!/bin/sh
# Test scenario by: kib@
# Test program obtained from Kyle Evans <kevans@FreeBSD.org>
# Demonstrate UFS SU file corruption:
# ffs: on write into a buffer without content
[ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1
. ../default.cfg
set -u
prog=$(basename "$0" .sh)
s=0
cat > /tmp/$prog.c <<EOF
#include <sys/mman.h>
#include <sys/stat.h>
#include <assert.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#define FILE "file"
int
main(void)
{
struct stat sb;
ssize_t wsz;
size_t bufsz;
void *buf, *obuf;
int mfd, fd;
int done = 0;
mfd = open(FILE, O_RDONLY);
assert(mfd >= 0);
assert(fstat(mfd, &sb) == 0);
bufsz = sb.st_size;
buf = obuf = mmap(NULL, bufsz, PROT_READ, MAP_SHARED, mfd, 0);
assert(buf != MAP_FAILED);
/* O_RDWR */
fd = open(FILE, O_RDWR);
if (fd < 0)
err(1, "open");
assert(fd >= 0);
again:
while (bufsz > 0) {
wsz = write(fd, buf, bufsz);
if (wsz < 0)
err(1, "write");
else if (wsz == 0)
fprintf(stderr, "Huh?\n");
bufsz -= wsz;
buf += wsz;
}
bufsz = sb.st_size;
buf = obuf;
if (++done < 2)
goto again;
close(fd);
munmap(obuf, sb.st_size);
close(mfd);
return (0);
}
EOF
mycc -o /tmp/$prog -Wall -Wextra -O0 /tmp/$prog.c || exit 1
mount | grep -q "on $mntpoint " && umount -f $mntpoint
mdconfig -l | grep -q md$mdstart && mdconfig -d -u $mdstart
mdconfig -s 32m -u $mdstart
pagesize=$(sysctl -n hw.pagesize)
newfs -Un -b $pagesize /dev/md$mdstart > /dev/null
mount /dev/md$mdstart $mntpoint
dd if=/dev/random of=/mnt/file.orig bs=${pagesize} count=1 status=none
cp $mntpoint/file.orig $mntpoint/file
cat $mntpoint/file $mntpoint/file > $mntpoint/file.post
umount $mntpoint
mount /dev/md$mdstart $mntpoint
(cd $mntpoint; /tmp/$prog)
if ! cmp $mntpoint/file $mntpoint/file.post; then
echo "Files differ"
ls -l $mntpoint/file $mntpoint/file.post
s=1
fi
umount $mntpoint
mdconfig -d -u $mdstart
rm /tmp/$prog /tmp/$prog.c
exit $s
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