Use secure_getenv for GOMP_DEBUG

2017-06-27  Tom de Vries  <tom@codesourcery.com>

	* env.c (parse_unsigned_long_1): Factor out of ...
	(parse_unsigned_long): ... here.
	(parse_int_1): Factor out of ...
	(parse_int): ... here.
	(parse_int_secure): New function.
	(initialize_env): Use parse_int_secure for GOMP_DEBUG.
	* secure_getenv.h: Factor out of ...
	* plugin/plugin-hsa.c: ... here.
	* testsuite/libgomp.oacc-c-c++-common/gomp-debug-env.c: New test.

From-SVN: r249694

1 files changed, 61 insertions, 0 deletions

diff --git a/libgomp/secure_getenv.h b/libgomp/secure_getenv.h
new file mode 100644
index 0000000..0d3ec5f
--- /dev/null
+++ b/libgomp/secure_getenv.h
@@ -0,0 +1,61 @@
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC 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, or (at your option)
+any later version.
+
+GCC 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef _SECURE_GETENV_H
+#define _SECURE_GETENV_H 1
+
+/* Secure getenv() which returns NULL if running as SUID/SGID.  */
+#ifndef HAVE_SECURE_GETENV
+#if defined (HAVE_UNISTD_H) && defined (HAVE_GETUID) \
+  && defined (HAVE_GETEUID) && defined (HAVE_GETGID) \
+  && defined (HAVE_GETEGID)
+
+#include <unistd.h>
+
+#if SUPPORTS_WEAKREF && defined (HAVE___SECURE_GETENV)
+static char* weak_secure_getenv (const char*)
+  __attribute__((__weakref__("__secure_getenv")));
+#endif
+
+/* Implementation of secure_getenv() for targets where it is not provided but
+   we have at least means to test real and effective IDs.  */
+
+static inline char *
+secure_getenv (const char *name)
+{
+#if SUPPORTS_WEAKREF && defined (HAVE___SECURE_GETENV)
+  if (weak_secure_getenv)
+    return weak_secure_getenv (name);
+#endif
+
+  if ((getuid () == geteuid ()) && (getgid () == getegid ()))
+    return getenv (name);
+  else
+    return NULL;
+}
+#else
+#define secure_getenv getenv
+#endif
+#endif
+
+#endif /* _SECURE_GETENV_H.  */