This is the mail archive of the
libc-alpha@sourceware.org
mailing list for the glibc project.
[PATCH] static-PIE: Update DT_DEBUG for debugger [BZ #23206]
- From: "H.J. Lu" <hongjiu dot lu at intel dot com>
- To: GNU C Library <libc-alpha at sourceware dot org>
- Date: Tue, 29 May 2018 05:08:48 -0700
- Subject: [PATCH] static-PIE: Update DT_DEBUG for debugger [BZ #23206]
- Reply-to: "H.J. Lu" <hjl dot tools at gmail dot com>
This is needed to support debugging dlopened shared libraries in static
PIE.
OK for master?
H.J.
[BZ #23206]
* elf/dl-reloc-static-pie.c (_dl_relocate_static_pie): Initialize
_r_debug and update DT_DEBUG for debugger.
---
elf/dl-reloc-static-pie.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/elf/dl-reloc-static-pie.c b/elf/dl-reloc-static-pie.c
index bd2d516e5d..ab1ce0eacc 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
--
2.17.0