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From: Philippe W. <phi...@sk...> - 2016-09-10 09:48:38
|
> 2016-09-09 20:28 GMT+02:00 Jakub Beránek <ber...@gm...>:
> I'm playing with symbolic execution inside Valgrind and
> therefore when the program calls malloc(x);
>
>
> I need to know the address of x to get its symbolic
> constraints (I don't really care about the actual value of x).
I am not sure to fully understand what you are trying to do.
There is not necessarily any address for the argument.
So, what is the tool supposed to do when you have a call such as:
malloc (10)
or
malloc (any_var + any_other_var)
?
In the first case, there is no var address
In the second case, also no address (or rather you might imagine you
have 2 addresses to track ?)
That being said, what you are trying to do might somewhat looks
like origin tracking in memcheck, which tries to determine the origin
of undef values (e.g. an allocation stack trace, or a stack frame).
You might maybe get some ideas from this.
Philippe
|
|
From: Ivo R. <iv...@iv...> - 2016-09-10 00:51:21
|
2016-09-09 20:28 GMT+02:00 Jakub Beránek <ber...@gm...>: > I'm playing with symbolic execution inside Valgrind and therefore when the > program calls malloc(x); > > I need to know the address of x to get its symbolic constraints (I don't > really care about the actual value of x). > > I realize that getting this to work will probably differ significantly > amongst different platforms, I'm not even sure if it's universally possible > (for example on AMD64 I can track the last assignment into > parameter-passing registers, but on x86 it's much harder to track what's on > the stack before a function call). > I also realize that this is not a typical usage for a Valgrind tool :-) > Oh my, that's completely different story, then. I am thinking how would you do that in the client/guest program itself, if there is no Valgrind involved. This would rely significantly on function argument passing convention used on every particular platform. > Maybe with DWARF I could link the function call to the parameter passing. > Maybe another possibility would be to mess with the IR code, in the tool's instrument() callback. But I don't see an efficient way at this moment. I. |