From: David Hildenbrand <david@redhat.com>
To: Peter Xu <peterx@redhat.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Matthew Wilcox <willy@infradead.org>,
Andrea Arcangeli <aarcange@redhat.com>,
John Hubbard <jhubbard@nvidia.com>,
Mike Rapoport <rppt@kernel.org>, Vlastimil Babka <vbabka@suse.cz>,
"Kirill A . Shutemov" <kirill@shutemov.name>,
Andrew Morton <akpm@linux-foundation.org>,
Mike Kravetz <mike.kravetz@oracle.com>,
James Houghton <jthoughton@google.com>,
Hugh Dickins <hughd@google.com>
Subject: Re: [PATCH 2/7] mm/hugetlb: Fix hugetlb_follow_page_mask() on permission checks
Date: Wed, 14 Jun 2023 17:57:41 +0200 [thread overview]
Message-ID: <ec8d0f27-a3e8-3b93-6703-9935e009ceb2@redhat.com> (raw)
In-Reply-To: <ZIng1SQ0xZ+eBua8@x1n>
On 14.06.23 17:46, Peter Xu wrote:
> On Wed, Jun 14, 2023 at 05:31:36PM +0200, David Hildenbrand wrote:
>> On 13.06.23 23:53, Peter Xu wrote:
>>> It seems hugetlb_follow_page_mask() was missing permission checks. For
>>> example, one follow_page() can get the hugetlb page with FOLL_WRITE even if
>>> the page is read-only.
>>
>> I'm curious if there even is a follow_page() user that operates on hugetlb
>> ...
>>
>> s390x secure storage does not apply to hugetlb IIRC.
>
> You're the expert, so I'll rely on you. :)
>
Hehe, there is a comment in gmap_destroy_page(), above one of the
follow_page() users:
/*
* Huge pages should not be able to become secure
*/
if (is_vm_hugetlb_page(vma))
goto out;
--
Cheers,
David / dhildenb
next prev parent reply other threads:[~2023-06-14 15:57 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-13 21:53 [PATCH 0/7] mm/gup: Unify hugetlb, speed up thp Peter Xu
2023-06-13 21:53 ` [PATCH 1/7] mm/hugetlb: Handle FOLL_DUMP well in follow_page_mask() Peter Xu
2023-06-14 23:24 ` Mike Kravetz
2023-06-16 8:08 ` David Hildenbrand
2023-06-13 21:53 ` [PATCH 2/7] mm/hugetlb: Fix hugetlb_follow_page_mask() on permission checks Peter Xu
2023-06-14 15:31 ` David Hildenbrand
2023-06-14 15:46 ` Peter Xu
2023-06-14 15:57 ` David Hildenbrand [this message]
2023-06-15 0:11 ` Mike Kravetz
2023-06-13 21:53 ` [PATCH 3/7] mm/hugetlb: Add page_mask for hugetlb_follow_page_mask() Peter Xu
2023-06-15 0:17 ` Mike Kravetz
2023-06-16 8:11 ` David Hildenbrand
2023-06-19 21:43 ` Peter Xu
2023-06-20 7:01 ` David Hildenbrand
2023-06-20 14:40 ` Peter Xu
2023-06-13 21:53 ` [PATCH 4/7] mm/hugetlb: Prepare hugetlb_follow_page_mask() for FOLL_PIN Peter Xu
2023-06-14 14:57 ` David Hildenbrand
2023-06-14 15:11 ` Peter Xu
2023-06-14 15:17 ` David Hildenbrand
2023-06-14 15:31 ` Peter Xu
2023-06-14 15:47 ` David Hildenbrand
2023-06-14 15:51 ` Peter Xu
2023-06-15 0:25 ` Mike Kravetz
2023-06-15 19:42 ` Peter Xu
2023-06-13 21:53 ` [PATCH 5/7] mm/gup: Cleanup next_page handling Peter Xu
2023-06-17 19:48 ` Lorenzo Stoakes
2023-06-17 20:00 ` Lorenzo Stoakes
2023-06-19 19:18 ` Peter Xu
2023-06-13 21:53 ` [PATCH 6/7] mm/gup: Accelerate thp gup even for "pages != NULL" Peter Xu
2023-06-14 14:58 ` Matthew Wilcox
2023-06-14 15:19 ` Peter Xu
2023-06-14 15:35 ` Peter Xu
2023-06-17 20:27 ` Lorenzo Stoakes
2023-06-19 19:37 ` Peter Xu
2023-06-19 20:24 ` Peter Xu
2023-06-13 21:53 ` [PATCH 7/7] mm/gup: Retire follow_hugetlb_page() Peter Xu
2023-06-14 14:37 ` Jason Gunthorpe
2023-06-17 20:40 ` Lorenzo Stoakes
2023-06-19 19:41 ` Peter Xu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=ec8d0f27-a3e8-3b93-6703-9935e009ceb2@redhat.com \
--to=david@redhat.com \
--cc=aarcange@redhat.com \
--cc=akpm@linux-foundation.org \
--cc=hughd@google.com \
--cc=jhubbard@nvidia.com \
--cc=jthoughton@google.com \
--cc=kirill@shutemov.name \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mike.kravetz@oracle.com \
--cc=peterx@redhat.com \
--cc=rppt@kernel.org \
--cc=vbabka@suse.cz \
--cc=willy@infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox