On Thu, Apr 19, 2018 at 9:02 AM, Dave Hansen
wrote:
> On 04/18/2018 05:11 PM, Kees Cook wrote:
>> On Fri, Apr 6, 2018 at 1:55 PM, Dave Hansen
>> wrote:
>>> +/*
>>> + * For some configurations, map all of kernel text into the user page
>>> + * tables. This reduces TLB misses, especially on non-P
On 04/18/2018 05:11 PM, Kees Cook wrote:
> On Fri, Apr 6, 2018 at 1:55 PM, Dave Hansen
> wrote:
>> +/*
>> + * For some configurations, map all of kernel text into the user page
>> + * tables. This reduces TLB misses, especially on non-PCID systems.
>> + */
>> +void pti_clone_kernel_text(void)
>>
On Fri, Apr 6, 2018 at 1:55 PM, Dave Hansen wrote:
> +/*
> + * For some configurations, map all of kernel text into the user page
> + * tables. This reduces TLB misses, especially on non-PCID systems.
> + */
> +void pti_clone_kernel_text(void)
> +{
> + unsigned long start = PFN_ALIGN(_text)
Note: This has changed since the last version. It now clones the
kernel text PMDs at a much later point and also disables this
functionality on AMD K8 processors. Details in the patch.
--
I'm sticking this at the end of the series because it's a bit weird.
It can be dropped and the rest of the
Hi Dave,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on tip/auto-latest]
[also build test WARNING on next-20180403]
[cannot apply to tip/x86/core v4.16]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system]
url:
Note: This has changed since the last version. It now clones the
kernel text PMDs at a much later point and also disables this
functionality on AMD K8 processors. Details in the patch.
--
I'm sticking this at the end of the series because it's a bit weird.
It can be dropped and the rest of the
Note: This has changed since the last version. It now clones the
kernel text PMDs at a much later point and also disables this
functionality on AMD K8 processors. Details in the patch.
--
I'm sticking this at the end of the series because it's a bit weird.
It can be dropped and the rest of the
I'm sticking this at the end of the series because it's a bit weird.
It can be dropped and the rest of the series is still useful without
it.
Global pages are bad for hardening because they potentially let an
exploit read the kernel image via a Meltdown-style attack which
makes it easier to find
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