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glibc & eglibc: fix mips DT_MIPS_RLD_MAP checking

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On mips target, binutils currently sets DT_MIPS_RLD_MAP to 0 in dynamic
section if a --version-script sets _RLD_MAP to local. This is apparently
a binutils bug, but libc shouldn't segfault in this case.

Add sanity check on the entry to avoid segfault, fixes [BUGID #287].

Signed-off-by: Qing He <qing.he@intel.com>
This commit is contained in:
Qing He
2010-09-25 15:19:45 +08:00
committed by Saul Wold
parent 5c8fad6544
commit 0f55d28a4d
4 changed files with 46 additions and 2 deletions
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21
meta/recipes-core/eglibc/eglibc-2.12/mips-rld-map-check.patch Normal file
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@@ -0,0 +1,21 @@
On mips target, binutils currently sets DT_MIPS_RLD_MAP to 0 in dynamic
section if a --version-script sets _RLD_MAP to local. This is apparently
a binutils bug, but libc shouldn't segfault in this case.
see also: http://sourceware.org/bugilla/show_bug.cgi?id=11615
9/19/2010 - added by Qing He <qing.he@intel.com>
---
diff -ru glibc-2.10.1.orig/ports/sysdeps/mips/dl-machine.h glibc-2.10.1/ports/sysdeps/mips/dl-machine.h
--- glibc-2.10.1.orig/ports/sysdeps/mips/dl-machine.h 2009-05-16 16:36:20.000000000 +0800
+++ glibc-2.10.1/ports/sysdeps/mips/dl-machine.h 2010-09-19 09:11:53.000000000 +0800
@@ -70,7 +70,8 @@
/* If there is a DT_MIPS_RLD_MAP entry in the dynamic section, fill it in
with the run-time address of the r_debug structure */
#define ELF_MACHINE_DEBUG_SETUP(l,r) \
-do { if ((l)->l_info[DT_MIPS (RLD_MAP)]) \
+do { if ((l)->l_info[DT_MIPS (RLD_MAP)] && \
+ (l)->l_info[DT_MIPS (RLD_MAP)]->d_un.d_ptr) \
*(ElfW(Addr) *)((l)->l_info[DT_MIPS (RLD_MAP)]->d_un.d_ptr) = \
(ElfW(Addr)) (r); \
} while (0)