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Date:      Thu, 24 Jul 2014 08:51:47 +0100
From:      "Robert N. M. Watson" <rwatson@FreeBSD.org>
To:        Pedro Giffuni <pfg@freebsd.org>
Cc:        PaX Team <pageexec@freemail.hu>, "freebsd-arch@freebsd.org" <freebsd-arch@freebsd.org>, Oliver Pinter <oliver.pntr@gmail.com>, Bryan Drewery <bdrewery@FreeBSD.org>, Shawn Webb <lattera@gmail.com>
Subject:   Re: [RFC] ASLR Whitepaper and Candidate Final Patch
Message-ID:  <860889F3-EA75-4C08-A1A4-904CE7A94899@FreeBSD.org>
In-Reply-To: <D4BC6F5C-E041-42BA-B798-85F7911390A6@freebsd.org>
References:  <96C72773-3239-427E-A90B-D05FF0F5B782@freebsd.org> <20140720201858.GB29618@pwnie.vrt.sourcefire.com> <alpine.BSF.2.11.1407230017490.88645@fledge.watson.org> <20140723004543.GH29618@pwnie.vrt.sourcefire.com> <D7CEDB47-2818-461A-BB70-479BEBDCEEE9@freebsd.org> <20140723234455.GP29618@pwnie.vrt.sourcefire.com> <D4BC6F5C-E041-42BA-B798-85F7911390A6@freebsd.org>

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>>>>> Great news that this work is coming to fruition -- ASLR is long overdu=
e.
>>>>>=20
>>>>> Are you having any luck with performance measurements?  Unixbench seem=
s like a=20
>>>>> good starting point, but I wonder if it would be useful to look, in=20=

>>>>> particular, at memory-mapping intensive workloads that might be affect=
ed as a=20
>>>>> result of changes in kernel VM data-structure use, or greater fragment=
ation of
>>>>> the address space.  I'm not sure I have a specific application here in=
 mind --=20
>>>>> in the past I might have pointed out tools such as ElectricFence that t=
end to=20
>>>>> increase fragmentation themselves.
>>>>=20
>>>> The unixbench tests on that laptop have finished. However, I've been
>>>> fighting a pesky migraine these last couple days, so I haven't had the
>>>> opportunity to aggregate the results into a nice little spreadsheet. I'=
m
>>>> hoping to finish it up by the end of the week.
>>>>=20
>>>> I'll take a look at ElectricFence this weekend. Additionally, I have a
>>>> netbook somewhere. Once I find it and its power cord, I'll install
>>>> FreeBSD/x86 and re-run the same tests on that.
>>>=20
>>> Somewhat related to ElectricFence? will ASLR have an adverse effect on d=
ebuggers?
>>>=20
>>> I googled around and got to this:
>>>=20
>>> http://www.outflux.net/blog/archives/2010/07/03/gdb-turns-off-aslr/
>>=20
>> I've been doing all my ClamAV development on my FreeBSD box with ASLR
>> enabled. Development tools like gdb and valgrind work great, even with
>> corefiles. I have not, however, tried lldb.
>=20
> OK, but it=E2=80=99s worth to take a look if we need to support something t=
o turn it off.
> Apparently gdb disables ASLR on MacOSX too:
>=20
> http://reverse.put.as/2011/08/11/how-gdb-disables-aslr-in-mac-os-x-lion/
>=20
> Pedro.
>=20



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