Messages in this thread | | | Date | Sat, 10 Dec 2016 20:27:57 +0800 | From | Baoquan He <> | Subject | Re: [PATCH v2 2/2] x86/KASLR/64: Determine kernel text mapping size at runtime |
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On 12/10/16 at 11:31am, Borislav Petkov wrote: > On Fri, Dec 09, 2016 at 10:41:58PM +0800, Baoquan He wrote: > > X86 64 kernel takes KERNEL_IMAGE_SIZE as the kernel text mapping size, > > and it's fixed as compiling time, changing from 512M to 1G as long as > > CONFIG_RANDOMIZE_BASE is enabled, though people specify kernel option > > "nokaslr" explicitly. > > > > This could be a wrong behaviour. > > A bunch of changes just because "this could be a wrong behavior". I'm > not really persuaded.
Well, then apologize for this wrong expression. It should be "This is a wrong behaviour."
Whether CONFIG_RANDOMIZE_BASE is yes or not, with 'nokaslr' specified, Kernel text mapping size should be 512M, just the same as no kaslr code compiled in.
Thanks Baoquan
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