[PATCH] Adding diversity for security

[Alex Rosenberg]

I'm not a crypto geek but... I think the choices of seeds need to be explained in the comments.

For example, the result of malloced memory is likely to be just zeros on some platforms and the addresses of command line argument pointers is likely to be constant between runs.

Alex

> On Oct 1, 2013, at 3:13 PM, Stephen Crane <sjcrane at uci.edu> wrote:
> 
> Adds the capability to randomly insert NOPs, permuting the code layout, as well as the option to randomize scheduling decisions. Includes an OpenSSL-linked RNG to provide secure random number generation.
> 
> http://llvm-reviews.chandlerc.com/D1802
> 
> Files:
>  CMakeLists.txt
>  Makefile.config.in
>  autoconf/configure.ac
>  cmake/config-ix.cmake
>  cmake/modules/LLVM-Config.cmake
>  configure
>  include/llvm/CodeGen/CommandFlags.h
>  include/llvm/CodeGen/MachineInstr.h
>  include/llvm/Config/config.h.cmake
>  include/llvm/Config/config.h.in
>  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
>  test/Makefile
>  test/lit.cfg
>  test/lit.site.cfg.in
>  tools/llc/llc.cpp
>  tools/opt/opt.cpp
> <D1802.1.patch>
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