1#!/bin/sh 2 3# 4# SPDX-License-Identifier: BSD-2-Clause-FreeBSD 5# 6# Copyright (c) 2021 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# Test of: 31# AT_BENEATH 0x1000 /* Fail if not under dirfd */ 32# AT_RESOLVE_BENEATH 0x2000 /* As AT_BENEATH, but do not allow 33# resolve to walk out of dirfd even 34 35dir=/tmp/beneath4.dir 36rm -rf $dir 37mkdir -p $dir 38here=`pwd` 39cd $dir 40 41cat > beneath4.c <<EOF 42#include <sys/stat.h> 43 44#include <err.h> 45#include <errno.h> 46#include <fcntl.h> 47#include <stdio.h> 48#include <stdlib.h> 49#include <string.h> 50#include <unistd.h> 51 52int 53main(int argc, char *argv[]) 54{ 55 struct stat st; 56 int exp, fd, flag, r; 57 char *cwd, *dir, *obj, *s; 58 59 if (argc != 5) { 60 fprintf(stderr, 61 "Usage: %s <dir> <test obj> <flag> <expected return>\n", 62 argv[0]); 63 return (1); 64 } 65 66 cwd = getwd(NULL); 67 dir = argv[1]; 68 obj = argv[2]; 69 sscanf(argv[3], "%x", &flag); 70 exp = atoi(argv[4]); 71#if 0 72 if ((flag & AT_RESOLVE_BENEATH) == 0) { 73 fprintf(stderr, "Flag must be %#x or %#x\n", 74 AT_BENEATH, AT_RESOLVE_BENEATH); 75 return (1); 76 } 77#endif 78 if ((fd = open(dir, O_DIRECTORY | O_RDONLY)) == -1) 79 err(1, "open(%s)", dir); 80 81 if (fstatat(fd, obj, &st, flag) == -1) 82 r = errno; 83 else 84 r = 0; 85 s = "FAIL"; 86 if (r == exp) 87 s = "OK"; 88 warn("cwd=%s, top=%s. flag=%0.6x. fstatf(%s) = %2d (expect %2d). %4s", 89 cwd, dir, flag, obj, r, exp, s); 90 91 return (r == exp ? 0 : errno); 92} 93EOF 94cc -o beneath4 -Wall -Wextra -O2 -g beneath4.c || exit 1 95rm beneath4.c 96 97mkdir -p /tmp/beneath4.dir/a/a 98touch /tmp/beneath4.dir/a/f 99ln /tmp/beneath4.dir/a/f /tmp/beneath4.dir/a/c 100ln -s /tmp/beneath4.dir/a/a /tmp/beneath4.dir/a/d 101ln -s /tmp/beneath4.dir/a/b /tmp/beneath4.dir/a/e 102mkfifo /tmp/beneath4.dir/a/fifo 103 104top=$dir/a 105 106cd $here 107s=0 108#ls -lR $dir 109#echo AT_BENEATH 110#$dir/beneath4 $top a 0x1000 0 || s=1 111#$dir/beneath4 $top b 0x1000 2 || s=1 112#$dir/beneath4 $top c 0x1000 0 || s=1 113#$dir/beneath4 $top d 0x1000 0 || s=1 114#$dir/beneath4 $top e 0x1000 2 || s=1 115#$dir/beneath4 $top fifo 0x1000 0 || s=1 116#$dir/beneath4 $top $top/../../beneath4.d/a/a 0x1000 93 || s=1 117#$dir/beneath4 $top $top/.. 0x1000 93 || s=1 118#$dir/beneath4 $top ../a 0x1000 0 || s=1 119 120printf "\nAT_RESOLVE_BENEATH\n" 121$dir/beneath4 $top a 0x2000 0 || s=1 122$dir/beneath4 $top b 0x2000 2 || s=1 123$dir/beneath4 $top c 0x2000 0 || s=1 124$dir/beneath4 $top d 0x2000 93 || s=1 125$dir/beneath4 $top e 0x2000 93 || s=1 126$dir/beneath4 $top fifo 0x2000 0 || s=1 127$dir/beneath4 $top $top/../../beneath4.d/a/a 0x2000 93 || s=1 128$dir/beneath4 $top $top/.. 0x2000 93 || s=1 129$dir/beneath4 $top ../a 0x2000 93 || s=1 130printf "\nNo flag\n" 131$dir/beneath4 $top ../a 0x0000 0 || s=1 132rm -rf $top 133exit $s 134