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authorRoland McGrath <roland@hack.frob.com>2014-08-12 09:49:58 -0700
committerRoland McGrath <roland@hack.frob.com>2014-08-12 09:49:58 -0700
commit9a8a57209aeab41109bec84f2eeee75a7c1fdc60 (patch)
treee7b814c48c77b40948b25eb286b7cca925a25d3f /NEWS
parent7fda3e6f16aa2efaf3f156c996c6b8f334884252 (diff)
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NEWS: Mention x86-64 ld.so use of Intel MPX instructions.
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@@ -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