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kasan: Cleanup the __HAVE_ARCH_SHADOW_MAP usage

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As Linus suggested, __HAVE_ARCH_XYZ is "stupid" and "having historical
uses of it doesn't make it good". So migrate __HAVE_ARCH_SHADOW_MAP to
separate macros named after the respective functions.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Reviewed-by: WANG Xuerui <git@xen0n.name>
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Huacai Chen 2023-09-20 14:26:29 +08:00
parent b795fb9f58
commit 2a86f1b56a
3 changed files with 12 additions and 8 deletions
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10
arch/loongarch/include/asm/kasan.h
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@ -10,8 +10,6 @@
#include <asm/io.h>
#include <asm/pgtable.h>
#define __HAVE_ARCH_SHADOW_MAP
#define KASAN_SHADOW_SCALE_SHIFT 3
#define KASAN_SHADOW_OFFSET _AC(CONFIG_KASAN_SHADOW_OFFSET, UL)
@ -68,6 +66,7 @@ static __always_inline bool kasan_arch_is_ready(void)
return !kasan_early_stage;
}
#define kasan_mem_to_shadow kasan_mem_to_shadow
static inline void *kasan_mem_to_shadow(const void *addr)
{
if (!kasan_arch_is_ready()) {
@ -97,6 +96,7 @@ static inline void *kasan_mem_to_shadow(const void *addr)
}
}
#define kasan_shadow_to_mem kasan_shadow_to_mem
static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
{
unsigned long addr = (unsigned long)shadow_addr;
@ -119,6 +119,12 @@ static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
}
}
#define addr_has_metadata addr_has_metadata
static __always_inline bool addr_has_metadata(const void *addr)
{
return (kasan_mem_to_shadow((void *)addr) != NULL);
}
void kasan_init(void);
asmlinkage void kasan_early_init(void);

2
include/linux/kasan.h
View File

@ -54,7 +54,7 @@ extern p4d_t kasan_early_shadow_p4d[MAX_PTRS_PER_P4D];
int kasan_populate_early_shadow(const void *shadow_start,
const void *shadow_end);
#ifndef __HAVE_ARCH_SHADOW_MAP
#ifndef kasan_mem_to_shadow
static inline void *kasan_mem_to_shadow(const void *addr)
{
return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT)

8
mm/kasan/kasan.h
View File

@ -291,7 +291,7 @@ struct kasan_stack_ring {
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
#ifndef __HAVE_ARCH_SHADOW_MAP
#ifndef kasan_shadow_to_mem
static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
{
return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET)
@ -299,15 +299,13 @@ static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
}
#endif
#ifndef addr_has_metadata
static __always_inline bool addr_has_metadata(const void *addr)
{
#ifdef __HAVE_ARCH_SHADOW_MAP
return (kasan_mem_to_shadow((void *)addr) != NULL);
#else
return (kasan_reset_tag(addr) >=
kasan_shadow_to_mem((void *)KASAN_SHADOW_START));
#endif
}
#endif
/**
* kasan_check_range - Check memory region, and report if invalid access.