Date: Wed, 23 Jul 2014 19:44:55 -0400 From: Shawn Webb <lattera@gmail.com> To: Pedro Giffuni <pfg@freebsd.org> 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: <20140723234455.GP29618@pwnie.vrt.sourcefire.com> In-Reply-To: <D7CEDB47-2818-461A-BB70-479BEBDCEEE9@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>
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[-- Attachment #1 --] On Jul 23, 2014 06:37 PM -0500, Pedro Giffuni wrote: > 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/ 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. > > So I guess we may have to patch gdb (and lldb)? From my experience with ClamAV development, I don't think so. gdb uses ptrace to get and set the registers, so ASLR doesn't matter. > > Pedro. > [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAEBAgAGBQJT0Ej1AAoJEGqEZY9SRW7uBDEP/ixd5suvrTzdlY+bKBRkfEJ4 SFRQi/UViQSU+6NtbnlvyJnbF6KfgKaM24jOo6O0so8Mwkm7CUtZVcidHITF2X5e wJz98Rpq7iaocrsLMoYhoSI0YYMcyI2IdsFquS0MOacxmEePBTSKBlJN1R60CbpB uZxhtpoSpD1o3rqWsG+JAMsrTDdOagrrtdO6zTf9VHLAG+Tjr4nFNCQJiXwnIs/H KbeqPYKp7Sj9Yu9E5rjkctYDYdkVRcDaFTHylQ8i19Uo1b+ThV+yvDr4LvHUTREc MqlumWz7a3PvWBhEyogUzBIJHXUnIsxyUREC4L2Q8iyH09U51uwKWLN4LumtXweL fG6fRv+0fZHYbMVsCDdrUhKgtcWG6zpkgG0bpD8sAIS7a/n7/LmGbkbhAHEBhHMQ m90WcKeGHiL0XDJJ35iKRip7E4zNN6DTmh1TP52feIbK6agCPLcT+DkEBdFypnFh ZFTHvDV4Fu6DBgIePcdSuPnlwslDPSK8lAGxWyKH77hEYXngvgbqfcHAsoLdtq2x XIa+56Ynq1ksZC/NxrDCG+TJ8kIFTqi6yJgDZlU6pWPlpUv/tIQKaAhSsfodLsYk nsAGkoYMXjrtZL+Bn4jakvaKR1mKLcs/dMTEb82X3Ioq9sCFptBjSJ43pooAlpuE V2IZJGRI2Q6PUibHOBc1 =JlWH -----END PGP SIGNATURE-----
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