Date: Tue, 30 Jan 2018 16:11:38 +1100 From: "Tobin C. Harding" <me@...in.cc> To: kaiwan.billimoria@...il.com Cc: Kernel Hardening <kernel-hardening@...ts.openwall.com>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] leaking_addresses: add 32-bit support On Tue, Jan 30, 2018 at 09:14:49AM +0530, kaiwan.billimoria@...il.com wrote: > Hi Tobin, > > On Mon, 2018-01-29 at 15:51 +1100, Tobin C. Harding wrote: > > Currently script only supports x86_64 and ppc64. It would be nice to be > > able to scan 32-bit machines also. We can add support for > > 32-bit architectures by modifying how we check for false positives, > > taking advantage of the page offset used by the kernel, and using the > > correct regular expression. > > > > Support for 32-bit machines is enabled by the observation the kernel > > addresses on 32-bit machines are larger than the page offset. We can > > use this to filter false positives when scanning the kernel for leaking > > addresses. > > > > Programmatic determination of the running architecture is not > > immediately obvious. We therefore provide a flag to enable scanning of > > 32-bit kernels. Also we can check the kernel config file for the offset > > and if not found default to 0xc0000000. A command line option to parse > > in the page offset is also provided. We do automatically detect > > architecture if running on ix86. > > > > Add support for 32-bit kernels. Add a command line option for page > > offset. > > > > Suggested-by: Kaiwan N Billimoria <kaiwan.billimoria@...il.com> > > Signed-off-by: Tobin C. Harding <me@...in.cc> > > --- > > > > The basis for this patch has been in development for a while by Kaiwan > > but didn't get finished before the merge window opened. I'd like to > > fast track this and get it to Linus this merge window (considering > > Spectre/Meltdown). I have finished this work off and added the > > Suggested-by tag. Kaiwan I hope you are not upset by this, extra > > ordinary circumstances seemed to require this action. > Definitely not; I understand and am glad you're on it a 100%. Apologies > that I couldn't work on this right now.. will try and keep track too. Thanks for the response. Tobin
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