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Message-ID: <20240621002616.40684-10-iii@linux.ibm.com>
Date: Fri, 21 Jun 2024 02:24:43 +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 09/39] kmsan: Expose kmsan_get_metadata()
Each s390 CPU has lowcore pages associated with it. Each CPU sees its
own lowcore at virtual address 0 through a hardware mechanism called
prefixing. Additionally, all lowcores are mapped to non-0 virtual
addresses stored in the lowcore_ptr[] array.
When lowcore is accessed through virtual address 0, one needs to
resolve metadata for lowcore_ptr[raw_smp_processor_id()].
Expose kmsan_get_metadata() to make it possible to do this from the
arch code.
Reviewed-by: Alexander Potapenko <glider@...gle.com>
Signed-off-by: Ilya Leoshkevich <iii@...ux.ibm.com>
---
include/linux/kmsan.h | 9 +++++++++
mm/kmsan/instrumentation.c | 1 +
mm/kmsan/kmsan.h | 1 -
3 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/include/linux/kmsan.h b/include/linux/kmsan.h
index e0c23a32cdf0..fe6c2212bdb1 100644
--- a/include/linux/kmsan.h
+++ b/include/linux/kmsan.h
@@ -230,6 +230,15 @@ void kmsan_handle_urb(const struct urb *urb, bool is_out);
*/
void kmsan_unpoison_entry_regs(const struct pt_regs *regs);
+/**
+ * kmsan_get_metadata() - Return a pointer to KMSAN shadow or origins.
+ * @addr: kernel address.
+ * @is_origin: whether to return origins or shadow.
+ *
+ * Return NULL if metadata cannot be found.
+ */
+void *kmsan_get_metadata(void *addr, bool is_origin);
+
#else
static inline void kmsan_init_shadow(void)
diff --git a/mm/kmsan/instrumentation.c b/mm/kmsan/instrumentation.c
index 8a1bbbc723ab..94b49fac9d8b 100644
--- a/mm/kmsan/instrumentation.c
+++ b/mm/kmsan/instrumentation.c
@@ -14,6 +14,7 @@
#include "kmsan.h"
#include <linux/gfp.h>
+#include <linux/kmsan.h>
#include <linux/kmsan_string.h>
#include <linux/mm.h>
#include <linux/uaccess.h>
diff --git a/mm/kmsan/kmsan.h b/mm/kmsan/kmsan.h
index adf443bcffe8..34b83c301d57 100644
--- a/mm/kmsan/kmsan.h
+++ b/mm/kmsan/kmsan.h
@@ -66,7 +66,6 @@ struct shadow_origin_ptr {
struct shadow_origin_ptr kmsan_get_shadow_origin_ptr(void *addr, u64 size,
bool store);
-void *kmsan_get_metadata(void *addr, bool is_origin);
void __init kmsan_init_alloc_meta_for_range(void *start, void *end);
enum kmsan_bug_reason {
--
2.45.1
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