linux-kernel - [tip:locking/core] kasan: Allow kasan_check_read/write() to accept pointers to volatiles

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Message-ID: <tip-f06e8c584fa0d05312c11ea66194f3d2efb93c21@git.kernel.org>
Date:   Wed, 26 Jul 2017 05:10:11 -0700
From:   tip-bot for Dmitry Vyukov <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, linux-kernel@...r.kernel.org, hpa@...or.com,
        mingo@...nel.org, torvalds@...ux-foundation.org,
        akpm@...ux-foundation.org, aryabinin@...tuozzo.com,
        mark.rutland@....com, dvyukov@...gle.com, peterz@...radead.org
Subject: [tip:locking/core] kasan: Allow kasan_check_read/write() to accept
 pointers to volatiles

Commit-ID:  f06e8c584fa0d05312c11ea66194f3d2efb93c21
Gitweb:     http://git.kernel.org/tip/f06e8c584fa0d05312c11ea66194f3d2efb93c21
Author:     Dmitry Vyukov <dvyukov@...gle.com>
AuthorDate: Thu, 22 Jun 2017 16:14:17 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 26 Jul 2017 13:08:54 +0200

kasan: Allow kasan_check_read/write() to accept pointers to volatiles

Currently kasan_check_read/write() accept 'const void*', make them
accept 'const volatile void*'. This is required for instrumentation
of atomic operations and there is just no reason to not allow that.

Signed-off-by: Dmitry Vyukov <dvyukov@...gle.com>
Reviewed-by: Andrey Ryabinin <aryabinin@...tuozzo.com>
Acked-by: Mark Rutland <mark.rutland@....com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: kasan-dev@...glegroups.com
Cc: linux-mm@...ck.org
Cc: will.deacon@....com
Link: http://lkml.kernel.org/r/33e5ec275c1ee89299245b2ebbccd63709c6021f.1498140838.git.dvyukov@google.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 include/linux/kasan-checks.h | 10 ++++++----
 mm/kasan/kasan.c             |  4 ++--
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/include/linux/kasan-checks.h b/include/linux/kasan-checks.h
index b7f8ace..41960fe 100644
--- a/include/linux/kasan-checks.h
+++ b/include/linux/kasan-checks.h
@@ -2,11 +2,13 @@
 #define _LINUX_KASAN_CHECKS_H
 
 #ifdef CONFIG_KASAN
-void kasan_check_read(const void *p, unsigned int size);
-void kasan_check_write(const void *p, unsigned int size);
+void kasan_check_read(const volatile void *p, unsigned int size);
+void kasan_check_write(const volatile void *p, unsigned int size);
 #else
-static inline void kasan_check_read(const void *p, unsigned int size) { }
-static inline void kasan_check_write(const void *p, unsigned int size) { }
+static inline void kasan_check_read(const volatile void *p, unsigned int size)
+{ }
+static inline void kasan_check_write(const volatile void *p, unsigned int size)
+{ }
 #endif
 
 #endif
diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c
index ca11bc4..6f319fb 100644
--- a/mm/kasan/kasan.c
+++ b/mm/kasan/kasan.c
@@ -267,13 +267,13 @@ static void check_memory_region(unsigned long addr,
 	check_memory_region_inline(addr, size, write, ret_ip);
 }
 
-void kasan_check_read(const void *p, unsigned int size)
+void kasan_check_read(const volatile void *p, unsigned int size)
 {
 	check_memory_region((unsigned long)p, size, false, _RET_IP_);
 }
 EXPORT_SYMBOL(kasan_check_read);
 
-void kasan_check_write(const void *p, unsigned int size)
+void kasan_check_write(const volatile void *p, unsigned int size)
 {
 	check_memory_region((unsigned long)p, size, true, _RET_IP_);
 }