The quilt patch titled
Subject: kmsan: core: kmsan_in_runtime() should return true in NMI context
has been removed from the -mm tree. Its filename was
kmsan-core-kmsan_in_runtime-should-return-true-in-nmi-context.patch
This patch was dropped because it was merged into the mm-hotfixes-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Alexander Potapenko <glider@xxxxxxxxxx>
Subject: kmsan: core: kmsan_in_runtime() should return true in NMI context
Date: Wed, 2 Nov 2022 12:06:07 +0100
Without that, every call to __msan_poison_alloca() in NMI may end up
allocating memory, which is NMI-unsafe.
Link: https://lkml.kernel.org/r/20221102110611.1085175-1-glider@xxxxxxxxxx
Link: https://lore.kernel.org/lkml/20221025221755.3810809-1-glider@xxxxxxxxxx/
Signed-off-by: Alexander Potapenko <glider@xxxxxxxxxx>
Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Marco Elver <elver@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Masahiro Yamada <masahiroy@xxxxxxxxxx>
Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/kmsan/kmsan.h | 2 ++
1 file changed, 2 insertions(+)
--- a/mm/kmsan/kmsan.h~kmsan-core-kmsan_in_runtime-should-return-true-in-nmi-context
+++ a/mm/kmsan/kmsan.h
@@ -124,6 +124,8 @@ static __always_inline bool kmsan_in_run
{
if ((hardirq_count() >> HARDIRQ_SHIFT) > 1)
return true;
+ if (in_nmi())
+ return true;
return kmsan_get_context()->kmsan_in_runtime;
}
_
Patches currently in -mm which might be from glider@xxxxxxxxxx are
