From 9a8a57209aeab41109bec84f2eeee75a7c1fdc60 Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Tue, 12 Aug 2014 09:49:58 -0700 Subject: NEWS: Mention x86-64 ld.so use of Intel MPX instructions. --- ChangeLog | 4 ++++ NEWS | 10 ++++++++++ 2 files changed, 14 insertions(+) diff --git a/ChangeLog b/ChangeLog index a1285a8087..5137ae730d 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,7 @@ +2014-08-12 Roland McGrath + + * NEWS: Mention x86-64 ld.so use of Intel MPX instructions. + 2014-08-12 Bernard Ogden [BZ #16892] diff --git a/NEWS b/NEWS index a65f323342..5b67934f90 100644 --- a/NEWS +++ b/NEWS @@ -97,6 +97,16 @@ Version 2.20 silently replaced with the "C" locale when running in AT_SECURE mode (e.g., in a SUID program). This is no longer necessary because of the additional checks. + +* On x86-64, the dynamic linker's lazy-binding support is now compatible + with application code using Intel MPX instructions. (With all previous + versions, the MPX register state could be clobbered when making calls + into or out of a shared library.) Note that while the new dynamic + linker is compatible with all known x86 hardware whether or not it + supports Intel MPX, some x86 instruction-set emulators might fail to + handle the new instruction encodings. This is known to affect Valgrind + versions up through 3.9 (but will be fixed in the forthcoming 3.10 + release), and might affect other tools that do instruction emulation. Version 2.19 -- cgit v1.2.3