From: "Mike Rapoport (Microsoft)" <rppt@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>,
Alexander Potapenko <glider@google.com>,
David Hildenbrand <david@kernel.org>,
Marco Elver <elver@google.com>,
"Rafael J. Wysocki" <rafael@kernel.org>
Cc: Dmitry Vyukov <dvyukov@google.com>, Len Brown <lenb@kernel.org>,
Mike Rapoport <rppt@kernel.org>, Pavel Machek <pavel@kernel.org>,
kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, linux-pm@vger.kernel.org
Subject: [PATCH 2/5] hibernation: ensure secretmem pages don't reach a snapshot
Date: Thu, 17 Sep 2026 09:07:04 +0300 [thread overview]
Message-ID: <20260917-hibernation-v1-2-7f7dfae3dbe0@kernel.org> (raw)
In-Reply-To: <20260917-hibernation-v1-0-7f7dfae3dbe0@kernel.org>
hibernation_available() checks for active secretmem users, but a secretmem
file can be created after this check and its pages may get into the
hibernation snapshot although they should not.
Recheck secretmem state after userspace is frozen and abort hibernation if
secretmem is active.
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
---
kernel/power/hibernate.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index d2479c69d71a4..281ad49411481 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -412,6 +412,11 @@ int hibernation_snapshot(int platform_mode)
if (error)
goto Close;
+ if (secretmem_active()) {
+ error = -EBUSY;
+ goto Thaw;
+ }
+
if (hibernation_test(TEST_FREEZER)) {
/*
--
2.53.0
next prev parent reply other threads:[~2026-09-17 6:07 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-17 6:07 [PATCH 0/5] hibernation: make safe_copy_page more robust and remove debug_pagealloc support Mike Rapoport (Microsoft)
2026-09-17 6:07 ` [PATCH 1/5] hibernation: make swsusp_page helpers static Mike Rapoport (Microsoft)
2026-09-17 6:07 ` Mike Rapoport (Microsoft) [this message]
2026-09-17 6:07 ` [PATCH 3/5] hibernate: handle potential errors in hibernate_{map,unmap}_page() Mike Rapoport (Microsoft)
2026-09-17 6:07 ` [PATCH 4/5] hibernation, KFENCE: explicitly map/unmap KFENCE pages Mike Rapoport (Microsoft)
2026-09-17 6:07 ` [PATCH 5/5] hibernation: make hibernation unavailable when debug_pagealloc is on Mike Rapoport (Microsoft)
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