linux-kernel - Re: [PATCH v3 0/5] Use nth_page() in place of direct struct page manipulation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230913141204.b32ad42ac917c0e393d82a24@linux-foundation.org>
Date:   Wed, 13 Sep 2023 14:12:04 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Zi Yan <ziy@...dia.com>
Cc:     Zi Yan <zi.yan@...t.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        David Hildenbrand <david@...hat.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Muchun Song <muchun.song@...ux.dev>,
        "Mike Rapoport (IBM)" <rppt@...nel.org>
Subject: Re: [PATCH v3 0/5] Use nth_page() in place of direct struct page
 manipulation

On Wed, 13 Sep 2023 16:12:43 -0400 Zi Yan <zi.yan@...t.com> wrote:

> On SPARSEMEM without VMEMMAP, struct page is not guaranteed to be
> contiguous, since each memory section's memmap might be allocated
> independently. hugetlb pages can go beyond a memory section size, thus
> direct struct page manipulation on hugetlb pages/subpages might give
> wrong struct page. Kernel provides nth_page() to do the manipulation
> properly. Use that whenever code can see hugetlb pages.

for (each patch) {

	Can we please explain why -stable backporting is recommended?

	Such an explanation will, as always, include a description of the
	user-visible effects of the bug.

	Some of the Fixes: targets are very old: 5 years.  Has something
	changed to bring these flaws to light?  Or is it from code inspection?
}

Thanks.