From: Jacek Wielemborek <d33tah@gmail.com>
Date: Wed, 06 Jan 2016 09:27:33 GMT
Subject: Re: Segmentation fault found while fuzzing .pack file under 2.7.0.rc3
Message-ID: <568CDE05.5040602@gmail.com>
In-Reply-To: <20160106002333.GA16090@google.com>

W dniu 06.01.2016 o 01:23, Jonathan Nieder pisze:
> Jeff King wrote:
> 
>> Git packfiles come from two places:
>>
>>   1. Local maintenance repacks loose and already-packed objects into a
>>      new packfile. We trust the local repack process to generate a valid
>>      packfile (though the contents of individual objects may be
>>      untrusted, of course).
> 
> I think we should reconsider such trust.  If one user creates a
> malicious pack, if another user uses read-only git commands to access
> the repository (after inspecting .git/config to make sure it doesn't
> contain anything scary) the result should not be arbitrary code
> execution.
> 
> Producing bogus output or aborting is okay; arbitrary code execution
> less so.
> 
> Thanks,
> Jonathan

I'd be happy to help you go through the fuzzing process - I don't have
enough horsepower and codebase knowledge to do it on my own though. If
you have an afl-fuzz question though, let me know.