[PATCH] Insert random noops to increase security against ROP attacks (llvm)

[Mehdi Amini]

Hi,

I don’t have much background on this topic, but I’m interested to understand how inserting a random number of noops help addressing ROP attacks. Do you have a link that explains this “counter-measure”?

Thanks,

Mehdi

> On Jan 5, 2015, at 2:59 PM, Stephen Crane <sjcrane at uci.edu> wrote:
> 
> - Revert loop termination back to include insertion slot before terminators.
> - Fix spelling
> - Update tests to reflect new default insertion percentage.
> - Formatting fixes
> 
> 
> http://reviews.llvm.org/D3392
> 
> Files:
>  include/llvm/CodeGen/CommandFlags.h
>  include/llvm/CodeGen/NoopInsertion.h
>  include/llvm/CodeGen/Passes.h
>  include/llvm/InitializePasses.h
>  include/llvm/Support/RandomNumberGenerator.h
>  include/llvm/Target/TargetInstrInfo.h
>  include/llvm/Target/TargetOptions.h
>  lib/CodeGen/CMakeLists.txt
>  lib/CodeGen/CodeGen.cpp
>  lib/CodeGen/NoopInsertion.cpp
>  lib/CodeGen/Passes.cpp
>  lib/Target/X86/X86InstrInfo.cpp
>  lib/Target/X86/X86InstrInfo.h
>  test/CodeGen/Mips/noop-insert.ll
>  test/CodeGen/PowerPC/noop-insert.ll
>  test/CodeGen/X86/noop-insert-percentage.ll
>  test/CodeGen/X86/noop-insert.ll
> 
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