cp -a, mv, and install --preserve-context, no longer seg fault when running

  with SELinux enabled, when copying from file systems that return an error

  when reading the SELinux context for a file.

  [bug introduced in coreutils-8.22]

      if (!tcon)

        {

          errno = ENODATA;

          return rc;

        }

#!/bin/sh

# Ensure we handle file systems returning no SELinux context,

# which triggered a segmentation fault in coreutils-8.22.

# This test is skipped on systems that lack LD_PRELOAD support; that's fine.

# Similarly, on a system that lacks lgetfilecon altogether, skipping it is fine.

# Copyright (C) 2014 Free Software Foundation, Inc.

# This program is free software: you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License

# along with this program.  If not, see <http://www.gnu.org/licenses/>.

. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src

print_ver_ cp

require_gcc_shared_

# Replace each getfilecon and lgetfilecon call with a call to these stubs.

cat > k.c <<'EOF' || framework_failure_

#include <stdio.h>

#include <selinux/selinux.h>

#include <errno.h>

int getfilecon (const char *path, security_context_t *con)

{

  /* Leave a marker so we can identify if the function was intercepted.  */

  fclose(fopen("preloaded", "w"));

  errno=ENODATA;

  return -1;

}

int lgetfilecon (const char *path, security_context_t *con)

{ return getfilecon (path, con); }

EOF

# Then compile/link it:

gcc_shared_ k.c k.so \

  || skip_ 'failed to build SELinux shared library'

touch file_src

# New file with SELinux context optionally included

LD_PRELOAD=./k.so cp -a file_src file_dst || fail=1

# Existing file with SELinux context optionally included

LD_PRELOAD=./k.so cp -a file_src file_dst || fail=1

# ENODATA should give an immediate error when required to preserve ctx

# This is debatable, and maybe we should not fail when no context available?

LD_PRELOAD=./k.so cp --preserve=context file_src file_dst && fail=1

test -e preloaded || skip_ 'LD_PRELOAD interception failed'

Exit $fail

  tests/cp/no-ctx.sh				\