1#!/bin/sh 2# Ensure we handle file systems returning no SELinux context, 3# which triggered a segmentation fault in coreutils-8.22. 4# This test is skipped on systems that lack LD_PRELOAD support; that's fine. 5# Similarly, on a system that lacks lgetfilecon altogether, skipping it is fine. 6 7# Copyright (C) 2014-2023 Free Software Foundation, Inc. 8 9# This program is free software: you can redistribute it and/or modify 10# it under the terms of the GNU General Public License as published by 11# the Free Software Foundation, either version 3 of the License, or 12# (at your option) any later version. 13 14# This program is distributed in the hope that it will be useful, 15# but WITHOUT ANY WARRANTY; without even the implied warranty of 16# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17# GNU General Public License for more details. 18 19# You should have received a copy of the GNU General Public License 20# along with this program. If not, see <https://www.gnu.org/licenses/>. 21 22. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src 23print_ver_ cp 24require_gcc_shared_ 25require_selinux_ 26 27# Replace each getfilecon and lgetfilecon call with a call to these stubs. 28cat > k.c <<'EOF' || framework_failure_ 29#include <stdio.h> 30#include <selinux/selinux.h> 31#include <errno.h> 32 33int getfilecon (const char *path, char **con) 34{ 35 /* Leave a marker so we can identify if the function was intercepted. */ 36 fclose(fopen("preloaded", "w")); 37 38 errno=ENODATA; 39 return -1; 40} 41 42int lgetfilecon (const char *path, char **con) 43{ return getfilecon (path, con); } 44EOF 45 46# Then compile/link it: 47gcc_shared_ k.c k.so \ 48 || skip_ 'failed to build SELinux shared library' 49 50touch file_src 51 52# New file with SELinux context optionally included 53LD_PRELOAD=$LD_PRELOAD:./k.so cp -a file_src file_dst || fail=1 54 55# Existing file with SELinux context optionally included 56LD_PRELOAD=$LD_PRELOAD:./k.so cp -a file_src file_dst || fail=1 57 58# ENODATA should give an immediate error when required to preserve ctx 59# This is debatable, and maybe we should not fail when no context available? 60( export LD_PRELOAD=$LD_PRELOAD:./k.so 61 returns_ 1 cp --preserve=context file_src file_dst ) || fail=1 62 63test -e preloaded || skip_ 'LD_PRELOAD interception failed' 64 65Exit $fail 66