GNU C Library master sources branch master updated. glibc-2.27.9000-427-g7f7b5d8

[hjl at sourceware dot org]

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- Log -----------------------------------------------------------------
http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=7f7b5d8ded77db90c1fbfeaaeb3d58b6db84da47

commit 7f7b5d8ded77db90c1fbfeaaeb3d58b6db84da47
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Tue May 29 06:33:42 2018 -0700

    static-PIE: Update DT_DEBUG for debugger [BZ #23206]
    
    This is needed to support debugging dlopened shared libraries in static
    PIE.
    
    	[BZ #23206]
    	* elf/dl-reloc-static-pie.c (_dl_relocate_static_pie): Initialize
    	_r_debug and update DT_DEBUG for debugger.
    
    Reviewed-by: Carlos O'Donell <carlos@redhat.com>

diff --git a/ChangeLog b/ChangeLog
index b9684f4..efd0bec 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2018-05-29  H.J. Lu  <hongjiu.lu@intel.com>
+
+	[BZ #23206]
+	* elf/dl-reloc-static-pie.c (_dl_relocate_static_pie): Initialize
+	_r_debug and update DT_DEBUG for debugger.
+
 2018-05-29  Florian Weimer  <fweimer@redhat.com>
 
 	* stdlib/Makefile (tst-strtod1i.out): Depend on generated locales.
diff --git a/elf/dl-reloc-static-pie.c b/elf/dl-reloc-static-pie.c
index bd2d516..ab1ce0e 100644
--- a/elf/dl-reloc-static-pie.c
+++ b/elf/dl-reloc-static-pie.c
@@ -48,5 +48,21 @@ _dl_relocate_static_pie (void)
      data access using the global offset table.  */
   ELF_DYNAMIC_RELOCATE (main_map, 0, 0, 0);
   main_map->l_relocated = 1;
+
+  /* Initialize _r_debug.  */
+  struct r_debug *r = _dl_debug_initialize (0, LM_ID_BASE);
+  r->r_state = RT_CONSISTENT;
+
+  /* Set up debugging before the debugger is notified for the first
+     time.  */
+# ifdef ELF_MACHINE_DEBUG_SETUP
+  /* Some machines (e.g. MIPS) don't use DT_DEBUG in this way.  */
+  ELF_MACHINE_DEBUG_SETUP (main_map, r);
+# else
+  if (main_map->l_info[DT_DEBUG] != NULL)
+    /* There is a DT_DEBUG entry in the dynamic section.  Fill it in
+       with the run-time address of the r_debug structure  */
+    main_map->l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r;
+# endif
 }
 #endif

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                 |    6 ++++++
 elf/dl-reloc-static-pie.c |   16 ++++++++++++++++
 2 files changed, 22 insertions(+), 0 deletions(-)


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