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BACKPORT: kasan: split kasan_*enabled() functions into a separate header

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In an upcoming commit we are going to need to call
kasan_hw_tags_enabled() from arch/arm64/include/asm/mte.h. This
would create a circular dependency between headers if KASAN_GENERIC
or KASAN_SW_TAGS is enabled: linux/kasan.h -> linux/pgtable.h ->
asm/pgtable.h -> asm/mte.h -> linux/kasan.h. Break the cycle
by introducing a new header linux/kasan-enabled.h with the
kasan_*enabled() functions that can be included from asm/mte.h.

Link: https://linux-review.googlesource.com/id/I5b0d96c6ed0026fc790899e14d42b2fac6ab568e
Signed-off-by: Peter Collingbourne <pcc@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Link: https://lore.kernel.org/r/20220219012945.894950-1-pcc@google.com
Signed-off-by: Will Deacon <will@kernel.org>

Bug: 238956478
(cherry picked from commit f9b5e46f40)
Change-Id: I631ae7d32ed560dd22917a4691c498e234b4f51d
Signed-off-by: Jaewon Kim <jaewon31.kim@samsung.com>
Bug: 254721825
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
This commit is contained in:
Peter Collingbourne
2022-02-18 17:29:44 -08:00
committed by Todd Kjos
parent bc36689351
commit 3b920b4596
2 changed files with 34 additions and 28 deletions
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33
include/linux/kasan-enabled.h Normal file
View File

@@ -0,0 +1,33 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_KASAN_ENABLED_H
#define _LINUX_KASAN_ENABLED_H
#ifdef CONFIG_KASAN_HW_TAGS
DECLARE_STATIC_KEY_FALSE(kasan_flag_enabled);
static __always_inline bool kasan_enabled(void)
{
return static_branch_likely(&kasan_flag_enabled);
}
static inline bool kasan_hw_tags_enabled(void)
{
return kasan_enabled();
}
#else /* CONFIG_KASAN_HW_TAGS */
static inline bool kasan_enabled(void)
{
return IS_ENABLED(CONFIG_KASAN);
}
static inline bool kasan_hw_tags_enabled(void)
{
return false;
}
#endif /* CONFIG_KASAN_HW_TAGS */
#endif /* LINUX_KASAN_ENABLED_H */

29
include/linux/kasan.h
View File

@@ -3,6 +3,7 @@
#define _LINUX_KASAN_H
#include <linux/bug.h>
#include <linux/kasan-enabled.h>
#include <linux/kernel.h>
#include <linux/static_key.h>
#include <linux/types.h>
@@ -82,34 +83,6 @@ static inline void kasan_disable_current(void) {}
#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
#ifdef CONFIG_KASAN_HW_TAGS
DECLARE_STATIC_KEY_FALSE(kasan_flag_enabled);
static __always_inline bool kasan_enabled(void)
{
return static_branch_likely(&kasan_flag_enabled);
}
static inline bool kasan_hw_tags_enabled(void)
{
return kasan_enabled();
}
#else /* CONFIG_KASAN_HW_TAGS */
static inline bool kasan_enabled(void)
{
return IS_ENABLED(CONFIG_KASAN);
}
static inline bool kasan_hw_tags_enabled(void)
{
return false;
}
#endif /* CONFIG_KASAN_HW_TAGS */
static inline bool kasan_has_integrated_init(void)
{
return kasan_hw_tags_enabled();