[PATCH] Adding diversity for security

[Stephen James Crane]

Hi Nadav,

I added the flag to be able to skip over inserted NOPs when traversing the
MachineBasicBlock terminator list (CodeGen/MachineBasicBlock.cpp). There's
probably a better way to do this, but I don't know it. Any ideas? We still
wanted to insert in between terminators, since we don't want to leave
anything predictably untouched.

- stephen


On Wed, Oct 16, 2013 at 5:50 PM, Nadav Rotem <nrotem at apple.com> wrote:

> Hi Stephen,
>
> Why did you need to add a new NOP flag and the isInsertedNOP function ?
>
> Thanks,
> Nadav
>
>
> On Oct 16, 2013, at 5:30 PM, Stephen Crane <sjcrane at uci.edu> wrote:
>
> >    - Replaced OpenSSL AES RNG with an MD5 HMAC_DRBG RNG
> >    - Updating test cases for new RNG
> >    - Formatting and comments for the RNG
> >
> > http://llvm-reviews.chandlerc.com/D1802
> >
> > CHANGE SINCE LAST DIFF
> >  http://llvm-reviews.chandlerc.com/D1802?vs=4930&id=4977#toc
> >
> > Files:
> >  include/llvm/CodeGen/CommandFlags.h
> >  include/llvm/CodeGen/MachineInstr.h
> >  include/llvm/MC/MCRegisterInfo.h
> >  include/llvm/Support/RandomNumberGenerator.h
> >  include/llvm/Target/TargetOptions.h
> >  lib/CodeGen/LLVMBuild.txt
> >  lib/CodeGen/MachineBasicBlock.cpp
> >  lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
> >  lib/LTO/LTOCodeGenerator.cpp
> >  lib/LTO/LTOModule.cpp
> >  lib/Support/CMakeLists.txt
> >  lib/Support/RandomNumberGenerator.cpp
> >  lib/Target/X86/CMakeLists.txt
> >  lib/Target/X86/NOPInsertion.cpp
> >  lib/Target/X86/X86.h
> >  lib/Target/X86/X86TargetMachine.cpp
> >  test/CodeGen/X86/nop-insert-percentage.ll
> >  test/CodeGen/X86/nop-insert.ll
> >  test/CodeGen/X86/sched-rnd-test.ll
> >  tools/llc/llc.cpp
> >  tools/llvm-lto/llvm-lto.cpp
> >  tools/lto/lto.cpp
> >  tools/opt/opt.cpp
> > <D1802.7.patch>
>
>
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