From b3c5d309672fc270e50a3c93b92a6fe68a89a9f2 Mon Sep 17 00:00:00 2001
From: Packit Service <user-cont-team+packit-service@redhat.com>
Date: Jan 06 2021 22:39:40 +0000
Subject: Apply patch glibc-rh1882466-2.patch


patch_name: glibc-rh1882466-2.patch
present_in_specfile: true
location_in_specfile: 535

---

diff --git a/elf/Makefile b/elf/Makefile
index 6702993..fc9c685 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -215,7 +215,7 @@ tests-internal += loadtest unload unload2 circleload1 \
 	 tst-tls3 tst-tls6 tst-tls7 tst-tls8 tst-dlmopen2 \
 	 tst-ptrguard1 tst-stackguard1 tst-libc_dlvsym \
 	 tst-create_format1 tst-tls-surplus tst-dl-hwcaps_split
-tests-container += tst-pldd
+tests-container += tst-pldd tst-preload-pthread-libc
 ifeq ($(build-hardcoded-path-in-tests),yes)
 tests += tst-dlopen-aout
 tst-dlopen-aout-no-pie = yes
diff --git a/elf/dl-deps.c b/elf/dl-deps.c
index 50f053a..007069f 100644
--- a/elf/dl-deps.c
+++ b/elf/dl-deps.c
@@ -610,7 +610,12 @@ Filters not supported with LD_TRACE_PRELINKING"));
     memcpy (l_initfini, map->l_searchlist.r_list,
 	    nlist * sizeof (struct link_map *));
 
-  _dl_sort_maps (&l_initfini[1], nlist - 1, NULL, false);
+  /* If libc.so.6 is the main map, it participates in the sort, so
+     that the relocation order is correct regarding libc.so.6.  */
+  if (l_initfini[0] == GL (dl_ns)[l_initfini[0]->l_ns].libc_map)
+    _dl_sort_maps (l_initfini, nlist, NULL, false);
+  else
+    _dl_sort_maps (&l_initfini[1], nlist - 1, NULL, false);
 
   /* Terminate the list of dependencies.  */
   l_initfini[nlist] = NULL;
diff --git a/elf/tst-preload-pthread-libc.c b/elf/tst-preload-pthread-libc.c
new file mode 100644
index 0000000..48cb512
--- /dev/null
+++ b/elf/tst-preload-pthread-libc.c
@@ -0,0 +1,36 @@
+/* Test relocation ordering if the main executable is libc.so.6 (bug 20972).
+   Copyright (C) 2020 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
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   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
+   <https://www.gnu.org/licenses/>.  */
+
+#include <gnu/lib-names.h>
+#include <stdio.h>
+#include <support/support.h>
+#include <unistd.h>
+
+int
+main (void)
+{
+  char *libc = xasprintf ("%s/%s", support_slibdir_prefix, LIBC_SO);
+  char *argv[] = { libc, NULL };
+  char *envp[] = { (char *) "LD_PRELOAD=" LIBPTHREAD_SO,
+    /* Relocation ordering matters most without lazy binding.  */
+    (char *) "LD_BIND_NOW=1",
+    NULL };
+  execve (libc, argv, envp);
+  printf ("execve of %s failed: %m\n", libc);
+  return 1;
+}