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From e88e72730d891f9f863c331d7c922b10ac3951c0 Mon Sep 17 00:00:00 2001
From: Suren Baghdasaryan <surenb@google.com>
Date: Wed, 5 Jul 2023 18:14:00 -0700
Subject: [PATCH] mm: disable CONFIG_PER_VMA_LOCK until its fixed
A memory corruption was reported in [1] with bisection pointing to the
patch [2] enabling per-VMA locks for x86.
Disable per-VMA locks config to prevent this issue until the fix is
confirmed. This is expected to be a temporary measure.
[1] https://bugzilla.kernel.org/show_bug.cgi?id=217624
[2] https://lore.kernel.org/all/20230227173632.3292573-30-surenb@google.com
Reported-by: Jiri Slaby <jirislaby@kernel.org>
Closes: https://lore.kernel.org/all/dbdef34c-3a07-5951-e1ae-e9c6e3cdf51b@kernel.org/
Reported-by: Jacob Young <jacobly.alt@gmail.com>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217624
Fixes: 0bff0aaea03e ("x86/mm: try VMA lock-based page fault handling first")
Cc: stable@vger.kernel.org
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Applied-from: https://lore.kernel.org/all/20230706011400.2949242-2-surenb@google.com/
---
mm/Kconfig | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/Kconfig b/mm/Kconfig
index e3454087fd31ae..1d2afc2567d0e6 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -1198,8 +1198,9 @@ config ARCH_SUPPORTS_PER_VMA_LOCK
def_bool n
config PER_VMA_LOCK
- def_bool y
+ bool "Enable per-vma locking during page fault handling."
depends on ARCH_SUPPORTS_PER_VMA_LOCK && MMU && SMP
+ depends on BROKEN
help
Allow per-vma locking during page fault handling.
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