linux-kernel - [RFC v2 PATCH 1/5] migrate: Allow migrate_misplaced_folio

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: <20241210213744.2968-2-gourry@gourry.net>
Date: Tue, 10 Dec 2024 16:37:40 -0500
From: Gregory Price <gourry@...rry.net>
To: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org,
	nehagholkar@...a.com,
	abhishekd@...a.com,
	kernel-team@...a.com,
	david@...hat.com,
	nphamcs@...il.com,
	gourry@...rry.net,
	akpm@...ux-foundation.org,
	hannes@...xchg.org,
	kbusch@...a.com,
	ying.huang@...ux.alibaba.com
Subject: [RFC v2 PATCH 1/5] migrate: Allow migrate_misplaced_folio_prepare() to accept a NULL VMA.

migrate_misplaced_folio_prepare() may be called on a folio without
a VMA, and so it must be made to accept a NULL VMA.

Suggested-by: Johannes Weiner <hannes@...xchg.org>
Signed-off-by: Gregory Price <gourry@...rry.net>
---
 mm/migrate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index e9e00d1d1d19..af07b399060b 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2632,7 +2632,7 @@ int migrate_misplaced_folio_prepare(struct folio *folio,
 		 * See folio_likely_mapped_shared() on possible imprecision
 		 * when we cannot easily detect if a folio is shared.
 		 */
-		if ((vma->vm_flags & VM_EXEC) &&
+		if (vma && (vma->vm_flags & VM_EXEC) &&
 		    folio_likely_mapped_shared(folio))
 			return -EACCES;
 
-- 
2.43.0