[llvm-dev] Which are CFI (Control Flow Integrity) related files?

[Peter Collingbourne via llvm-dev]

On Tue, Aug 7, 2018 at 7:02 PM PenYiWang via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi
>
> I want to trace the code of clang/llvm CFI (Control Flow Integrity)
>  mechanism
>
> I found that there is ForwardControlFlowIntegrity.cpp in llvm 3.6
>
>
> https://github.com/llvm-mirror/llvm/blob/release_36/lib/CodeGen/ForwardControlFlowIntegrity.cpp
>
> But I don't know which files implement  CFI (Control Flow Integrity)  in
> later version
>
> (1)
>
> If I use this command
>
> clang-6.0 -fsanitize=cfi-icall -fvisibility=hidden -flto ./test.c
>
> Which files implement CFI ?
>

In that case it would be LowerTypeTests.cpp as well as parts of
clang/lib/CodeGen (grep for CFIICall).


>
> (2)
>
> I found these two files
>
> but I set break point  in gdb , and didn't find anything
>
> (gdb) b llvm::CrossDSOCFI::buildCFICheck
>
>
> https://github.com/llvm-mirror/llvm/blob/release_60/lib/Transforms/IPO/LowerTypeTests.cpp
>
> https://github.com/llvm-mirror/llvm/blob/release_60/lib/Transforms/IPO/CrossDSOCFI.cpp
>

The CrossDSOCFI.cpp file is only involved in implementing cross-DSO CFI
(i.e. -fsanitize-cfi-cross-dso). If you don't request cross-DSO CFI only
LowerTypeTests.cpp is used.


> (3)
>
> What's "MCCFIInstruction" ?
>
> Does it relate to CFI (Control Flow Integrity) ?
>
> http://llvm.org/doxygen/classllvm_1_1MCCFIInstruction.html
>

No, that's a different CFI.

Peter

>
>
> Thanks
>
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-- 
-- 
Peter
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