linux-kernel - [PATCH v6 17/39] mm: slub: Let KMSAN access metadata

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Date: Fri, 21 Jun 2024 02:24:51 +0200
From: Ilya Leoshkevich <iii@...ux.ibm.com>
To: Alexander Gordeev <agordeev@...ux.ibm.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Lameter <cl@...ux.com>, David Rientjes <rientjes@...gle.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>, Marco Elver <elver@...gle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Pekka Enberg <penberg@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Vasily Gorbik <gor@...ux.ibm.com>, Vlastimil Babka <vbabka@...e.cz>
Cc: Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>, kasan-dev@...glegroups.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-s390@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
        Mark Rutland <mark.rutland@....com>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Ilya Leoshkevich <iii@...ux.ibm.com>
Subject: [PATCH v6 17/39] mm: slub: Let KMSAN access metadata

Building the kernel with CONFIG_SLUB_DEBUG and CONFIG_KMSAN causes
KMSAN to complain about touching redzones in kfree().

Fix by extending the existing KASAN-related metadata_access_enable()
and metadata_access_disable() functions to KMSAN.

Acked-by: Vlastimil Babka <vbabka@...e.cz>
Reviewed-by: Alexander Potapenko <glider@...gle.com>
Signed-off-by: Ilya Leoshkevich <iii@...ux.ibm.com>
---
 mm/slub.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/slub.c b/mm/slub.c
index 1134091abac5..b050e528112c 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -829,10 +829,12 @@ static int disable_higher_order_debug;
 static inline void metadata_access_enable(void)
 {
 	kasan_disable_current();
+	kmsan_disable_current();
 }
 
 static inline void metadata_access_disable(void)
 {
+	kmsan_enable_current();
 	kasan_enable_current();
 }
 
-- 
2.45.1