Re: [PATCH v2 2/2] x86/KASLR: Increase BRK pages for KASLR memory randomization

2016-08-09 Thread Thomas Garnier
On Tue, Aug 9, 2016 at 9:54 AM, Borislav Petkov wrote: > On Tue, Aug 09, 2016 at 09:35:54AM -0700, Thomas Garnier wrote: >> Default implementation expects 6 pages maximum are needed for low page >> allocations. If KASLR memory randomization is enabled, the worse case >> of e820

Re: [PATCH v2 2/2] x86/KASLR: Increase BRK pages for KASLR memory randomization

2016-08-09 Thread Thomas Garnier
On Tue, Aug 9, 2016 at 9:54 AM, Borislav Petkov wrote: > On Tue, Aug 09, 2016 at 09:35:54AM -0700, Thomas Garnier wrote: >> Default implementation expects 6 pages maximum are needed for low page >> allocations. If KASLR memory randomization is enabled, the worse case >> of e820 layout would

Re: [PATCH v2 2/2] x86/KASLR: Increase BRK pages for KASLR memory randomization

2016-08-09 Thread Borislav Petkov
On Tue, Aug 09, 2016 at 09:35:54AM -0700, Thomas Garnier wrote: > Default implementation expects 6 pages maximum are needed for low page > allocations. If KASLR memory randomization is enabled, the worse case > of e820 layout would require 12 pages (no large pages). It is due to the > PUD level

Re: [PATCH v2 2/2] x86/KASLR: Increase BRK pages for KASLR memory randomization

2016-08-09 Thread Borislav Petkov
On Tue, Aug 09, 2016 at 09:35:54AM -0700, Thomas Garnier wrote: > Default implementation expects 6 pages maximum are needed for low page > allocations. If KASLR memory randomization is enabled, the worse case > of e820 layout would require 12 pages (no large pages). It is due to the > PUD level