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Re: [XEN PATCH] xen/page_alloc: scrub each page in unprepare_staticmem_pages
- To: peter kang <peter.kang@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 26 Oct 2026 12:00:32 +0100
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- Cc: anderson.choi@xxxxxxxxxx, matthew.l.weber3@xxxxxxxxxx, joshua.c.whitehead@xxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger@xxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 26 Oct 2026 11:00:43 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 26.10.2026 07:00, peter kang wrote:
> From: Peter Kang <peter.kang@xxxxxxxxxx>
>
> unprepare_staticmem_pages() can unprepare multiple pages in a static
> memory range. When need_scrub is true, each page must be scrubbed
> before it is marked static.
>
> The loop currently passes the base pointer pg to scrub_one_page() on
> every iteration. For a multi-page range, this repeatedly scrubs page 0
> and leaves the remaining pages unscrubbed, so a guest can later read
> stale data from pages 1..nr_mfns-1 of a static or static-shared bank.
>
> Pass &pg[i] to scrub_one_page() so each iteration scrubs the page it
> is processing. This ensures every page in the range is scrubbed before
> it is marked static.
>
> Fixes: 4a9e73e6e53e ("xen/arm: static memory initialization")
> Signed-off-by: Anderson Choi <anderson.choi@xxxxxxxxxx>
The patch itself is fine, but the tags aren't: The patch needs your own
S-o-b, and in the vast majority of cases the first S-o-b should match
From:, while the last S-o-b should match the sender.
Also please update the Cc: list - you've used a stale address for Roger.
Jan
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