Re: [DynInst_API:] BPatch_binaryEdit openBinary crashing

[Bill Williams <bill@xxxxxxxxxxx>]

> > I'll take a look at the patches over the next couple of days, but this
> > all sounds very promising.
> >
> > I don't have a definite answer for the trampoline issue, but I'd look at
> > whether there's a similar issue to the one with the imports where we
> > generated branches before .dyninst was fixed and didn't recalculate
> > them. The springboard code is very good at doing what it's told, so I'd
> > strongly suspect that we moved the section of relocated code after we
> > generated springboards.
> It would seem that that is the case. If if fix the base address
> "manually", it sort of works. As my patch for imports is hacky, is
> there a part of the API that does the recalculations or should I do
> them myself?
If memory serves, what we do on Linux is ensure that .dyninstInst is 
created somewhere fixed (end of the binary, more or less), so that we 
can actually generate the code correctly at instrumentation time. That's 
going to be the safest/easiest approach, I think--otherwise we might 
need to replace 5-byte near branches with longer code sequences and 
wholly regenerate the section contents.
> > > Cheers,
> > > Alex
> > >
> > > On 02/11/2015 06:20 PM, Matthew LeGendre wrote:
> > > > At one point, perhaps 6-7 years ago, a student had windows binary
> > > > rewriting working to the point where you could do basic binary rewriting
> > > > on notepad.exe.  They left before finishing the project, and it was
> > > > never feature complete nor functional on complicated binaries.  You're
> > > > likely seeing the remains of that effort.  I don't know how much of that
> > > > code is still valid or useful.
> > > >
> > > > -Matt
> > > >
> > > >
> > > > On Wed, 11 Feb 2015, Aleksandar Nikolic wrote:
> > > > > Hi,
> > > > >
> > > > > looking at the codebase, a lot of code seems to already be there.
> > > > > I'll be getting to know the code in more details. Any directions
> > > > > into what would need to be implemented or what parts are missing?
> > > > >
> > > > > Thanks,
> > > > > Alex
> > > > >
> > > > > On 02/08/2015 10:59 PM, Barton Miller wrote:
> > > > > > BTW, if there are any individuals or groups that would like to work on
> > > > > > getting rewriting to work on Windows, we'd be happy to provide
> > > > > > support.
> > > > > > Not a small effort but interesting and worthwhile.
> > > > > >
> > > > > > --bart
> > > > > >
> > > > > >
> > > > > > On 2/6/2015 4:36 PM, Bill Williams wrote:
> > > > > > > No, and not exactly. Windows binary rewriting is not supported,
> > > > > > > and is
> > > > > > > documented as such. If it were to be supported, what you are doing
> > > > > > > would work quite reasonably.
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--
--bw

Bill Williams
Paradyn Project
bill@xxxxxxxxxxx