linux-kernel - Re: [PATCH v3 6/8] mm/x86: arch_check_zapped

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Message-ID: <a9e95e2f-ab58-469c-a66e-30ee4617ad64@redhat.com>
Date: Wed, 31 Jul 2024 14:23:27 +0200
From: David Hildenbrand <david@...hat.com>
To: Peter Xu <peterx@...hat.com>, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org
Cc: Dave Jiang <dave.jiang@...el.com>, Rik van Riel <riel@...riel.com>,
 Dave Hansen <dave.hansen@...ux.intel.com>,
 Michael Ellerman <mpe@...erman.id.au>, linuxppc-dev@...ts.ozlabs.org,
 Matthew Wilcox <willy@...radead.org>,
 Rick P Edgecombe <rick.p.edgecombe@...el.com>,
 Oscar Salvador <osalvador@...e.de>, Mel Gorman
 <mgorman@...hsingularity.net>, Andrew Morton <akpm@...ux-foundation.org>,
 Borislav Petkov <bp@...en8.de>,
 Christophe Leroy <christophe.leroy@...roup.eu>,
 Huang Ying <ying.huang@...el.com>, "Kirill A . Shutemov"
 <kirill@...temov.name>, "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
 Dan Williams <dan.j.williams@...el.com>, Thomas Gleixner
 <tglx@...utronix.de>, Hugh Dickins <hughd@...gle.com>, x86@...nel.org,
 Nicholas Piggin <npiggin@...il.com>, Vlastimil Babka <vbabka@...e.cz>,
 Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v3 6/8] mm/x86: arch_check_zapped_pud()

On 15.07.24 21:21, Peter Xu wrote:
> Introduce arch_check_zapped_pud() to sanity check shadow stack on PUD zaps.
> It has the same logic of the PMD helper.
> 
> One thing to mention is, it might be a good idea to use page_table_check in
> the future for trapping wrong setups of shadow stack pgtable entries [1].
> That is left for the future as a separate effort.
> 
> [1] https://lore.kernel.org/all/59d518698f664e07c036a5098833d7b56b953305.camel@intel.com
> 
> Cc: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: x86@...nel.org
> Signed-off-by: Peter Xu <peterx@...hat.com>
> ---

Acked-by: David Hildenbrand <david@...hat.com>

-- 
Cheers,

David / dhildenb