linux-kernel - Re: [PATCH] mm: kfence: fix handling discontiguous page

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Message-Id: <20230323151850.e2785b1cff37fba078f26f2b@linux-foundation.org>
Date:   Thu, 23 Mar 2023 15:18:50 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Muchun Song <songmuchun@...edance.com>
Cc:     glider@...gle.com, elver@...gle.com, dvyukov@...gle.com,
        jannh@...gle.com, sjpark@...zon.de, muchun.song@...ux.dev,
        kasan-dev@...glegroups.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: kfence: fix handling discontiguous page

On Thu, 23 Mar 2023 10:50:03 +0800 Muchun Song <songmuchun@...edance.com> wrote:

> The struct pages could be discontiguous when the kfence pool is allocated
> via alloc_contig_pages() with CONFIG_SPARSEMEM and !CONFIG_SPARSEMEM_VMEMMAP.
> So, the iteration should use nth_page().

What are the user-visible runtime effects of this flaw?

Thanks.