Date: Wed, 23 Jul 2014 18:37:57 -0500 From: Pedro Giffuni <pfg@freebsd.org> To: Shawn Webb <lattera@gmail.com> Cc: PaX Team <pageexec@freemail.hu>, Oliver Pinter <oliver.pntr@gmail.com>, Robert Watson <rwatson@FreeBSD.org>, Bryan Drewery <bdrewery@FreeBSD.org>, freebsd-arch@freebsd.org Subject: Re: [RFC] ASLR Whitepaper and Candidate Final Patch Message-ID: <D7CEDB47-2818-461A-BB70-479BEBDCEEE9@freebsd.org> In-Reply-To: <20140723004543.GH29618@pwnie.vrt.sourcefire.com> 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>
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Hi; Il giorno 22/lug/2014, alle ore 19:45, Shawn Webb <lattera@gmail.com> ha scritto: >>> ... >> >> Hi Shawn: >> >> Great news that this work is coming to fruition -- ASLR is long overdue. >> >> Are you having any luck with performance measurements? Unixbench seems like a >> good starting point, but I wonder if it would be useful to look, in >> particular, at memory-mapping intensive workloads that might be affected as a >> result of changes in kernel VM data-structure use, or greater fragmentation of >> the address space. I'm not sure I have a specific application here in mind -- >> in the past I might have pointed out tools such as ElectricFence that tend to >> increase fragmentation themselves. > > 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. > > 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. > Somewhat related to ElectricFence… will ASLR have an adverse effect on debuggers? I googled around and got to this: http://www.outflux.net/blog/archives/2010/07/03/gdb-turns-off-aslr/ So I guess we may have to patch gdb (and lldb)? Pedro.home | help
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