copy: fix a segfault in SELinux context copying code

* src/selinux.c (restorecon_private): On ArchLinux the
`fakeroot cp -a file1 file2` command segfaulted due
to getfscreatecon() returning a NULL context.
So map this to the sometimes ignored ENODATA error,
rather than crashing.
* tests/cp/no-ctx.sh: Add a new test case.
* tests/local.mk: Reference the new test.
* NEWS: Mention the fix.
Fixes http://bugs.gnu.org/16335

diff --git a/NEWS b/NEWS
index 3e1f9c6ac60ae2a9fb40b872eaca58c9f08c6be6..699a7d3a14e1533487c09294d99ed34ab79e5fd8 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -9,6 +9,11 @@ GNU coreutils NEWS                                    -*- outline -*-
   the context of an existing directory to that of its last copied descendent.
   [bug introduced in coreutils-8.22]
 
+  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]
+
 
 * Noteworthy changes in release 8.22 (2013-12-13) [stable]
 

diff --git a/src/selinux.c b/src/selinux.c
index cd38a81e846aab10aa66ff75c1c6968c75a1f4ae..016db162604c2b618e3ae19377698265bc3a7120 100644 (file)
--- a/src/selinux.c
+++ b/src/selinux.c
@@ -192,6 +192,11 @@ restorecon_private (char const *path, bool local)
     {
       if (getfscreatecon (&tcon) < 0)
         return rc;
+      if (!tcon)
+        {
+          errno = ENODATA;
+          return rc;
+        }
       rc = lsetfilecon (path, tcon);
       freecon (tcon);
       return rc;

diff --git a/tests/cp/no-ctx.sh b/tests/cp/no-ctx.sh
new file mode 100755 (executable)
index 0000000..3b5eb82
--- /dev/null
+++ b/tests/cp/no-ctx.sh
@@ -0,0 +1,63 @@
+#!/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

diff --git a/tests/local.mk b/tests/local.mk
index dc7341c63a6b184f7dd7a432e8ffab686aeec913..9d556f6db563321377d3b95617149b28e649bfd9 100644 (file)
--- a/tests/local.mk
+++ b/tests/local.mk
@@ -161,6 +161,7 @@ all_tests =                                 \
   tests/rm/ext3-perf.sh                                \
   tests/rm/cycle.sh                            \
   tests/cp/link-heap.sh                                \
+  tests/cp/no-ctx.sh                           \
   tests/misc/tty-eof.pl                                \
   tests/tail-2/inotify-hash-abuse.sh           \
   tests/tail-2/inotify-hash-abuse2.sh          \