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On 2/7/2017 20:02, Kostya Serebryany wrote: > ... > > My understanding is that BNDCU is the cheapest possible instruction, > just like XOR or ADD, > so the overhead should be relatively small. > Still my guesstimate would be >= 5% since stores are very numerous. > And such overhead will be on top of whatever overhead SafeStack has. > Do you have any measurements to

Hi, I previously posted about using 32-bit X86 segmentation to harden SafeStack: http://lists.llvm.org/pipermail/llvm-dev/2016-May/100346.html That involves lowering the limits of the DS and ES segments that are used for ordinary data accesses while leaving the limit for SS, the stack segment, set to its maximum value. The safe stacks were clustered above the limits of DS and ES. Thus, by