linux-kernel - Re: [PATCH v7 21/41] mm: Add guard pages around a shadow stack.

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Message-ID: <f31108e7-c862-ace7-23b2-82ae9376ad38@redhat.com>
Date:   Tue, 7 Mar 2023 11:44:03 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Borislav Petkov <bp@...en8.de>,
        "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
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Subject: Re: [PATCH v7 21/41] mm: Add guard pages around a shadow stack.

On 07.03.23 11:32, Borislav Petkov wrote:
> On Tue, Mar 07, 2023 at 01:29:50AM +0000, Edgecombe, Rick P wrote:
>> On Mon, 2023-03-06 at 09:08 +0100, Borislav Petkov wrote:
>>> Just typos:
>>
>> All seem reasonable to me. Thanks.
>>
>> For using the log verbiage for the comment, it is quite big. Does
>> something like this seem reasonable?
> 
> Yeah, it does. I wouldn't want to lose that explanation in a commit
> message.
> 
> However, this special aspect pertains to the shstk implementation in x86
> but the code is generic mm and such arch-specific comments are kinda
> unfitting there.
> 
> I wonder if it would be better if you could stick that explanation
> somewhere in arch/x86/ and only refer to it in a short comment above
> VM_SHADOW_STACK check in stack_guard_start_gap()...

+1

-- 
Thanks,

David / dhildenb