From 14c5cbabc2d11004ab223ae5eae761ddf83ef99e Mon Sep 17 00:00:00 2001 From: Igor Zamyatin Date: Thu, 9 Jul 2015 06:50:12 -0700 Subject: Preserve bound registers for pointer pass/return We need to save/restore bound registers and add a BND prefix before branches in _dl_runtime_profile so that bound registers for pointer pass and return are preserved when LD_AUDIT is used. [BZ #18134] * sysdeps/i386/configure.ac: Set HAVE_MPX_SUPPORT. * sysdeps/i386/configure: Regenerated. * sysdeps/i386/dl-trampoline.S (PRESERVE_BND_REGS_PREFIX): New. (_dl_runtime_profile): Save and restore Intel MPX return bound registers when calling _dl_call_pltexit. Add PRESERVE_BND_REGS_PREFIX before return. * sysdeps/i386/link-defines.sym (LRV_BND0_OFFSET): New. (LRV_BND1_OFFSET): Likewise. * sysdeps/x86/bits/link.h (La_i86_retval): Add lrv_bnd0 and lrv_bnd1. * sysdeps/x86_64/dl-trampoline.S (_dl_runtime_profile): Fix typo in bndmov encoding. * sysdeps/x86_64/dl-trampoline.h: Properly save and restore Intel MPX bound registers. Add PRESERVE_BND_REGS_PREFIX before branch instructions to preserve bounds. --- sysdeps/x86/bits/link.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'sysdeps/x86') diff --git a/sysdeps/x86/bits/link.h b/sysdeps/x86/bits/link.h index 3f559c90da..0bf9b9a29b 100644 --- a/sysdeps/x86/bits/link.h +++ b/sysdeps/x86/bits/link.h @@ -38,6 +38,8 @@ typedef struct La_i86_retval uint32_t lrv_edx; long double lrv_st0; long double lrv_st1; + uint64_t lrv_bnd0; + uint64_t lrv_bnd1; } La_i86_retval; -- cgit 1.4.1