Re: Level to do such a modification...

[Nicholas Nethercote <njn at csse dot unimelb dot edu dot au>]

On Wed, 24 Jan 2007, [GB2312] ÎâêØ wrote:

> I am working on gcc 4.0.0. I want to use gcc to intercept each call to
> read, and taint the data readed in. For example:
> transform
> 	read(fd, buf, size)
> to
> 	read(fd, buf, size)
> 	if(is_socket(fd))
> 		taint(buf, size)
> So, what is the best suitable level to do this modification in gcc? My
> own thought is in finish_function, before calling c_genericize,as I
> discovered that in c front-end, there's no GENERIC tree... In
> c_genericize, it directly calls gimplify_function_tree.

Are you sure you want to do this in GCC?  You might find it easier to use a 
dynamic binary instrumentation framework such as Valgrind or Pin to do this 
kind of thing.

Nick