[gnome-continuous-yocto/gnomeostree-3.28-rocko: 2013/8267] glibc: Fix scope resolution in glibc to be breadth first.

[Emmanuele Bassi <ebassi src gnome org>]

commit 63ac3520b4d277ffb0f379397a5415e930c20d1d
Author: Mark Hatle <mark hatle windriver com>
Date:   Fri Aug 19 20:44:54 2016 -0500

    glibc: Fix scope resolution in glibc to be breadth first.
    
    The ELF specification indicates symbol resolution should be breadth first, not
    depth first.
    
    The dl-deps.c: dl_build_locale_scope function is processing in a depth first
    mode.  This is causes certain symbols to be incorrectly reported when
    LD_TRACE_PRELINKING=1 is enabled.
    
    See glibc BZ #20488 for more information.
    
    (From OE-Core rev: fb72263eaa94e64ddeee457b5b1bc999f0e647da)
    
    Signed-off-by: Mark Hatle <mark hatle windriver com>
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>

 .../glibc/glibc/0026-build_local_scope.patch       |   56 ++++++++++++++++++++
 meta/recipes-core/glibc/glibc_2.24.bb              |    1 +
 2 files changed, 57 insertions(+), 0 deletions(-)
---
diff --git a/meta/recipes-core/glibc/glibc/0026-build_local_scope.patch 
b/meta/recipes-core/glibc/glibc/0026-build_local_scope.patch
new file mode 100644
index 0000000..8e0cb83
--- /dev/null
+++ b/meta/recipes-core/glibc/glibc/0026-build_local_scope.patch
@@ -0,0 +1,56 @@
+From 6e4ec5a3c5fe63b6458036f18d43124de4a7e724 Mon Sep 17 00:00:00 2001
+From: Mark Hatle <mark hatle windriver com>
+Date: Thu, 18 Aug 2016 14:07:58 -0500
+Subject: [PATCH] elf/dl-deps.c: Make _dl_build_local_scope breadth first
+
+According to the ELF specification:
+
+When resolving symbolic references, the dynamic linker examines the symbol
+tables with a breadth-first search.
+
+This function was using a depth first search.  By doing so the conflict
+resolution reported to the prelinker (when LD_TRACE_PRELINKING=1 is set)
+was incorrect.  This caused problems when their were various circular
+dependencies between libraries.  The problem usually manifested itself by
+the wrong IFUNC being executed.
+
+[BZ# 20488]
+
+Upstream-Status: Submitted [libc-alpha]
+
+Signed-off-by: Mark Hatle <mark hatle windriver com>
+---
+ elf/dl-deps.c | 14 ++++++++++----
+ 1 file changed, 10 insertions(+), 4 deletions(-)
+
+diff --git a/elf/dl-deps.c b/elf/dl-deps.c
+index 6a82987..fc37c87 100644
+--- a/elf/dl-deps.c
++++ b/elf/dl-deps.c
+@@ -73,13 +73,19 @@ _dl_build_local_scope (struct link_map **list, struct link_map *map)
+ {
+   struct link_map **p = list;
+   struct link_map **q;
++  struct link_map **r;
+ 
+   *p++ = map;
+   map->l_reserved = 1;
+-  if (map->l_initfini)
+-    for (q = map->l_initfini + 1; *q; ++q)
+-      if (! (*q)->l_reserved)
+-      p += _dl_build_local_scope (p, *q);
++
++  for (r = list; r < p; ++r)
++    if ((*r)->l_initfini)
++      for (q = (*r)->l_initfini + 1; *q; ++q)
++      if (! (*q)->l_reserved)
++        {
++          *p++ = *q;
++          (*q)->l_reserved = 1;
++        }
+   return p - list;
+ }
+ 
+-- 
+2.5.5
+
diff --git a/meta/recipes-core/glibc/glibc_2.24.bb b/meta/recipes-core/glibc/glibc_2.24.bb
index e446e7a..a3ac738 100644
--- a/meta/recipes-core/glibc/glibc_2.24.bb
+++ b/meta/recipes-core/glibc/glibc_2.24.bb
@@ -36,6 +36,7 @@ SRC_URI = "${GLIBC_GIT_URI};branch=${SRCBRANCH};name=glibc \
            file://0023-eglibc-Install-PIC-archives.patch \
            file://0024-eglibc-Forward-port-cross-locale-generation-support.patch \
            file://0025-Define-DUMMY_LOCALE_T-if-not-defined.patch \
+           file://0026-build_local_scope.patch \
 "
 
 SRC_URI += "\