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Date: Fri, 05 Dec 2014 21:40:42 -0500
From: Daniel Micay <danielmicay@...il.com>
To: oss-security@...ts.openwall.com
Subject: Re: Offset2lib: bypassing full ASLR on 64bit Linux
On 05/12/14 09:23 PM, Reed Loden wrote:
> On Fri, Dec 5, 2014 at 4:59 PM, Daniel Micay <danielmicay@...il.com> wrote:
>
>>
>> I don't really see how this would prevent Mozilla from shipping a
>> browser with ASLR. The Tor browser has been shipping a fork of Firefox
>> built as a position independent executable for ages. It doesn't impact
>> users because they're either starting it via a .desktop file or the
>> command-line.
>>
>> The support for desktop icons in Nautilus is deprecated / disabled by
>> default with only a hidden dconf preference to enable it. If you really
>> want to support the workflow of opening up the file manager, navigating
>> to the binary and double-clicking it then using a wrapper script is a
>> quite obvious solution.
>>
>
> Obviously, some users are running into it (
> https://bugzilla.mozilla.org/show_bug.cgi?id=1076892), or it wouldn't have
> had to be backed out.
>
> ~reed
So why can't you hide away the binary and drop a script or desktop file
in that directory instead? A desktop file would also provide a better
user experience if unpacking it and using it directly from that
directory via a file manager is something you want to support.
You would be even better off making it a self-extracting archive,
dropping itself into $XDG_DATA_HOME / ~/.local/share like Steam (which
uses PIE...), and generating a desktop file to run it. There's no icon
or any other GUI niceties for the raw executable.
It's not the usual / supported way of doing things, so it's really not
surprising that it depends on a libmagic/file hack that doesn't work on
any security aware native executables. There is no shortage of projects
that have been enabling full ASLR for nearly a decade. The reason that
this is an issue for you isn't because PIE isn't well supported.
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