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mm/kasan: change kasan_check_{read,write} to return boolean

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This changes {,__}kasan_check_{read,write} functions to return a boolean
denoting if the access was valid or not.

[sfr@canb.auug.org.au: include types.h for "bool"]
  Link: http://lkml.kernel.org/r/20190705184949.13cdd021@canb.auug.org.au
Link: http://lkml.kernel.org/r/20190626142014.141844-3-elver@google.com
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Reviewed-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Marco Elver 2019-07-11 20:54:07 -07:00 • committed by Linus Torvalds
parent 7d8ad890da
commit b5f6e0fc7d
5 changed files with 47 additions and 26 deletions
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30
include/linux/kasan-checks.h
View file

@ -2,19 +2,25 @@
#ifndef _LINUX_KASAN_CHECKS_H
#define _LINUX_KASAN_CHECKS_H
#include <linux/types.h>
/*
* __kasan_check_*: Always available when KASAN is enabled. This may be used
* even in compilation units that selectively disable KASAN, but must use KASAN
* to validate access to an address. Never use these in header files!
*/
#ifdef CONFIG_KASAN
void __kasan_check_read(const volatile void *p, unsigned int size);
void __kasan_check_write(const volatile void *p, unsigned int size);
bool __kasan_check_read(const volatile void *p, unsigned int size);
bool __kasan_check_write(const volatile void *p, unsigned int size);
#else
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)
{ }
static inline bool __kasan_check_read(const volatile void *p, unsigned int size)
{
return true;
}
static inline bool __kasan_check_write(const volatile void *p, unsigned int size)
{
return true;
}
#endif
/*
@ -25,10 +31,14 @@ static inline void __kasan_check_write(const volatile void *p, unsigned int size
#define kasan_check_read __kasan_check_read
#define kasan_check_write __kasan_check_write
#else
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)
{ }
static inline bool kasan_check_read(const volatile void *p, unsigned int size)
{
return true;
}
static inline bool kasan_check_write(const volatile void *p, unsigned int size)
{
return true;
}
#endif
#endif