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 (file)
--- 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 (file)
--- 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