Date: Fri, 05 Dec 2014 17:18:35 -0800 From: Andy Lutomirski <luto@...capital.net> To: oss-security@...ts.openwall.com Subject: Re: Offset2lib: bypassing full ASLR on 64bit Linux On 12/05/2014 04:44 PM, Hanno Böck wrote: > On Fri, 05 Dec 2014 17:43:44 -0500 > Daniel Kahn Gillmor <dkg-QLrU/DhXBlmnlhUoGqYIEF6hYfS7NtTn@...lic.gmane.org> wrote: > >> i couldn't find a reference to this in the nautilus bugtracker, so i >> just posted: >> >> https://bugzilla.gnome.org/show_bug.cgi?id=741183 > > I tried to dig into this a bit. I'm not really sure, but based on the > output I assume nautilus is relying on file or libmagic to assess the > file type. > > And that's what fails: > $ file --mime-type pie > pie: application/x-sharedlib > > > It seems there is no really easy way to separate executables from > shared libraries and whether this should be considered a bug in > file/libmagic. The only thing I quickly found that would be possible is > searching if a SONAME is present. libmagic uses some "magic" file > format to parse files, I don't know if that's capable of such complex > parsing. > Why does gcc and/or ld write a non-zero entry point? If they didn't, that would be an easy way to check. --Andy > (oh, btw, this is one more reason to wipe out potential security bugs > in file...) >
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