From: Alistair Popple <alistair@popple.id.au>
To: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org,
"Andrew Morton" <akpm@linux-foundation.org>,
"Peter Xu" <peterx@redhat.com>,
"Jérôme Glisse" <jglisse@redhat.com>,
"John Hubbard" <jhubbard@nvidia.com>,
"Ralph Campbell" <rcampbell@nvidia.com>,
"Alistair Popple" <alistair@popple.id.au>,
stable@vger.kernel.org
Subject: [PATCH v2 1/2] mm/migrate: Fixup setting UFFD_WP flag
Date: Tue, 25 Aug 2020 16:42:31 +1000
Message-ID: <20200825064232.10023-1-alistair@popple.id.au> (raw)
Commit f45ec5ff16a75 ("userfaultfd: wp: support swap and page
migration") introduced support for tracking the uffd wp bit during page
migration. However the non-swap PTE variant was used to set the flag for
zone device private pages which are a type of swap page.
This leads to corruption of the swap offset if the original PTE has the
uffd_wp flag set.
Fixes: f45ec5ff16a75 ("userfaultfd: wp: support swap and page migration")
Signed-off-by: Alistair Popple <alistair@popple.id.au>
Reviewed-by: Peter Xu <peterx@redhat.com>
Cc: stable@vger.kernel.org
---
mm/migrate.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/migrate.c b/mm/migrate.c
index 34a842a8eb6a..ddb64253fe3e 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -251,7 +251,7 @@ static bool remove_migration_pte(struct page *page, struct vm_area_struct *vma,
entry = make_device_private_entry(new, pte_write(pte));
pte = swp_entry_to_pte(entry);
if (pte_swp_uffd_wp(*pvmw.pte))
- pte = pte_mkuffd_wp(pte);
+ pte = pte_swp_mkuffd_wp(pte);
}
}
--
2.20.1
next reply index
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-25 6:42 Alistair Popple [this message]
2020-08-25 6:42 ` [PATCH v2 2/2] mm/rmap: Fixup copying of soft dirty and uffd ptes Alistair Popple
2020-08-25 14:42 ` 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=20200825064232.10023-1-alistair@popple.id.au \
--to=alistair@popple.id.au \
--cc=akpm@linux-foundation.org \
--cc=jglisse@redhat.com \
--cc=jhubbard@nvidia.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=peterx@redhat.com \
--cc=rcampbell@nvidia.com \
--cc=stable@vger.kernel.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
Linux-mm Archive on lore.kernel.org
Archives are clonable:
git clone --mirror https://lore.kernel.org/linux-mm/0 linux-mm/git/0.git
# If you have public-inbox 1.1+ installed, you may
# initialize and index your mirror using the following commands:
public-inbox-init -V2 linux-mm linux-mm/ https://lore.kernel.org/linux-mm \
linux-mm@kvack.org
public-inbox-index linux-mm
Example config snippet for mirrors
Newsgroup available over NNTP:
nntp://nntp.lore.kernel.org/org.kvack.linux-mm
AGPL code for this site: git clone https://public-inbox.org/public-inbox.git