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Re: [PATCH][BZ #16046] Static dlopen correction fallout fixes

On Thu, 6 Feb 2014, Roland McGrath wrote:

> (The union hack was in fact wrong pedantically.)
> As it's adding a test for code changed in this cycle, I think it should go
> in before the branch.

 It didn't happen as I didn't make it before the branch was created.  I 
have committed it now; as it's been a while below is the patch and the 
original explanation again.  I'm not sure if it's worth backporting to 
2.19, probably not as it doesn't affect functionality (but let me know if 
you think otherwise).



 Thinking more about the test case I have concluded that maybe a
path-of-least-resistance check like below would do.  It verifies that
there's exactly one link map whose file name is null, as is the case with
the main executable only.  This approach may not be particularly robust,
but it does cover what BZ #16046 is about.

2014-01-31  Maciej W. Rozycki  <>

	[BZ #16046]
	* elf/tst-dl-iter-static.c: New file.
	* elf/Makefile (tests-static): Add tst-dl-iter-static.

Index: glibc-fsf-trunk-quilt/elf/Makefile
--- glibc-fsf-trunk-quilt.orig/elf/Makefile	2014-05-16 03:26:41.411962497 +0100
+++ glibc-fsf-trunk-quilt/elf/Makefile	2014-05-16 03:26:43.411965765 +0100
@@ -121,7 +121,7 @@ tests = tst-tls1 tst-tls2 tst-tls9 tst-l
 tests-static = tst-tls1-static tst-tls2-static tst-stackguard1-static \
 	       tst-leaks1-static tst-array1-static tst-array5-static \
-	       tst-ptrguard1-static
+	       tst-ptrguard1-static tst-dl-iter-static
 ifeq (yes,$(build-shared))
 tests-static += tst-tls9-static
 tst-tls9-static-ENV = \
Index: glibc-fsf-trunk-quilt/elf/tst-dl-iter-static.c
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ glibc-fsf-trunk-quilt/elf/tst-dl-iter-static.c	2014-05-16 03:26:43.411965765 +0100
@@ -0,0 +1,47 @@
+/* BZ #16046 dl_iterate_phdr static executable test.
+   Copyright (C) 2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   Lesser General Public License for more details.
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <>.  */
+#include <link.h>
+/* Check that the link map of the static executable itself is iterated
+   over exactly once.  */
+static int
+callback (struct dl_phdr_info *info, size_t size, void *data)
+  int *count = data;
+  if (info->dlpi_name[0] == '\0')
+    (*count)++;
+  return 0;
+static int
+do_test (void)
+  int count = 0;
+  int status;
+  status = dl_iterate_phdr (callback, &count);
+  return status || count != 1;
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"

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