[cfe-dev] Reflections on Trusting Trust

[John Criswell via cfe-dev]

On 2/27/17 8:33 PM, Willem Wyndham via cfe-dev wrote:
> I'm working a project to add a bug to Clang that is inspired by Ken 
> Thompson's famous article. My question is where in clang should I edit 
> to add source to the input source? I need my added source to be 
> internal to clang so that when I compile normal clang with my binary 
> the bug will still exist in the new compiler.

You probably want to examine and transform the Abstract Syntax Tree 
(AST) instead of the program's actual source.  I have not worked with 
the Clang libraries myself, but from what I understand, Clang provides 
something like LLVM's transform passes for modifying the AST.

Clang has some bug detection code that you could look at; this would 
help you learn how to examine the AST.

Regards,

John Criswell

>
> Best,
> Willem Wyndham
> Phd Student UMD, College Park
>
>
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-- 
John Criswell
Assistant Professor
Department of Computer Science, University of Rochester
http://www.cs.rochester.edu/u/criswell

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