Commit 69866fdf authored by Andrey Konovalov's avatar Andrey Konovalov Committed by Vincenzo Frascino
Browse files

kasan: inline kasan_reset_tag for tag-based modes



Using kasan_reset_tag() currently results in a function call. As it's
called quite often from the allocator code, this leads to a noticeable
slowdown. Move it to include/linux/kasan.h and turn it into a static
inline function. Also remove the now unneeded reset_tag() internal KASAN
macro and use kasan_reset_tag() instead.

Signed-off-by: default avatarAndrey Konovalov <andreyknvl@google.com>
Link: https://linux-review.googlesource.com/id/I4d2061acfe91d480a75df00b07c22d8494ef14b5
parent eadca96b
......@@ -191,7 +191,10 @@ static inline void kasan_record_aux_stack(void *ptr) {}
#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)
void *kasan_reset_tag(const void *addr);
static inline void *kasan_reset_tag(const void *addr)
{
return (void *)arch_kasan_reset_tag(addr);
}
bool kasan_report(unsigned long addr, size_t size,
bool is_write, unsigned long ip);
......
......@@ -174,14 +174,14 @@ size_t kasan_metadata_size(struct kmem_cache *cache)
struct kasan_alloc_meta *kasan_get_alloc_meta(struct kmem_cache *cache,
const void *object)
{
return (void *)reset_tag(object) + cache->kasan_info.alloc_meta_offset;
return kasan_reset_tag(object) + cache->kasan_info.alloc_meta_offset;
}
struct kasan_free_meta *kasan_get_free_meta(struct kmem_cache *cache,
const void *object)
{
BUILD_BUG_ON(sizeof(struct kasan_free_meta) > 32);
return (void *)reset_tag(object) + cache->kasan_info.free_meta_offset;
return kasan_reset_tag(object) + cache->kasan_info.free_meta_offset;
}
void kasan_poison_slab(struct page *page)
......@@ -278,7 +278,7 @@ static bool __kasan_slab_free(struct kmem_cache *cache, void *object,
tag = get_tag(object);
tagged_object = object;
object = reset_tag(object);
object = kasan_reset_tag(object);
if (unlikely(nearest_obj(cache, virt_to_head_page(object), object) !=
object)) {
......
......@@ -30,20 +30,15 @@ void kasan_init_hw_tags(void)
pr_info("KernelAddressSanitizer initialized\n");
}
void *kasan_reset_tag(const void *addr)
{
return reset_tag(addr);
}
void kasan_poison_memory(const void *address, size_t size, u8 value)
{
hw_set_mem_tag_range(reset_tag(address),
hw_set_mem_tag_range(kasan_reset_tag(address),
round_up(size, KASAN_GRANULE_SIZE), value);
}
void kasan_unpoison_memory(const void *address, size_t size)
{
hw_set_mem_tag_range(reset_tag(address),
hw_set_mem_tag_range(kasan_reset_tag(address),
round_up(size, KASAN_GRANULE_SIZE), get_tag(address));
}
......
......@@ -246,15 +246,11 @@ static inline const void *arch_kasan_set_tag(const void *addr, u8 tag)
return addr;
}
#endif
#ifndef arch_kasan_reset_tag
#define arch_kasan_reset_tag(addr) ((void *)(addr))
#endif
#ifndef arch_kasan_get_tag
#define arch_kasan_get_tag(addr) 0
#endif
#define set_tag(addr, tag) ((void *)arch_kasan_set_tag((addr), (tag)))
#define reset_tag(addr) ((void *)arch_kasan_reset_tag(addr))
#define get_tag(addr) arch_kasan_get_tag(addr)
#ifdef CONFIG_KASAN_HW_TAGS
......
......@@ -328,7 +328,7 @@ void kasan_report_invalid_free(void *object, unsigned long ip)
unsigned long flags;
u8 tag = get_tag(object);
object = reset_tag(object);
object = kasan_reset_tag(object);
#if IS_ENABLED(CONFIG_KUNIT)
if (current->kunit_test)
......@@ -361,7 +361,7 @@ static void __kasan_report(unsigned long addr, size_t size, bool is_write,
disable_trace_on_warning();
tagged_addr = (void *)addr;
untagged_addr = reset_tag(tagged_addr);
untagged_addr = kasan_reset_tag(tagged_addr);
info.access_addr = tagged_addr;
if (addr_has_metadata(untagged_addr))
......
......@@ -22,7 +22,7 @@ const char *get_bug_type(struct kasan_access_info *info)
void *find_first_bad_addr(void *addr, size_t size)
{
return reset_tag(addr);
return kasan_reset_tag(addr);
}
void metadata_fetch_row(char *buffer, void *row)
......
......@@ -41,7 +41,7 @@ const char *get_bug_type(struct kasan_access_info *info)
int i;
tag = get_tag(info->access_addr);
addr = reset_tag(info->access_addr);
addr = kasan_reset_tag(info->access_addr);
page = kasan_addr_to_page(addr);
if (page && PageSlab(page)) {
cache = page->slab_cache;
......@@ -72,7 +72,7 @@ const char *get_bug_type(struct kasan_access_info *info)
void *find_first_bad_addr(void *addr, size_t size)
{
u8 tag = get_tag(addr);
void *p = reset_tag(addr);
void *p = kasan_reset_tag(addr);
void *end = p + size;
while (p < end && tag == *(u8 *)kasan_mem_to_shadow(p))
......
......@@ -81,7 +81,7 @@ void kasan_poison_memory(const void *address, size_t size, u8 value)
* some of the callers (e.g. kasan_poison_object_data) pass tagged
* addresses to this function.
*/
address = reset_tag(address);
address = kasan_reset_tag(address);
shadow_start = kasan_mem_to_shadow(address);
shadow_end = kasan_mem_to_shadow(address + size);
......@@ -98,7 +98,7 @@ void kasan_unpoison_memory(const void *address, size_t size)
* some of the callers (e.g. kasan_unpoison_object_data) pass tagged
* addresses to this function.
*/
address = reset_tag(address);
address = kasan_reset_tag(address);
kasan_poison_memory(address, size, tag);
......
......@@ -67,11 +67,6 @@ u8 random_tag(void)
return (u8)(state % (KASAN_TAG_MAX + 1));
}
void *kasan_reset_tag(const void *addr)
{
return reset_tag(addr);
}
bool check_memory_region(unsigned long addr, size_t size, bool write,
unsigned long ret_ip)
{
......@@ -107,7 +102,7 @@ bool check_memory_region(unsigned long addr, size_t size, bool write,
if (tag == KASAN_TAG_KERNEL)
return true;
untagged_addr = reset_tag((const void *)addr);
untagged_addr = kasan_reset_tag((const void *)addr);
if (unlikely(untagged_addr <
kasan_shadow_to_mem((void *)KASAN_SHADOW_START))) {
return !kasan_report(addr, size, write, ret_ip);
......@@ -126,7 +121,7 @@ bool check_memory_region(unsigned long addr, size_t size, bool write,
bool check_invalid_free(void *addr)
{
u8 tag = get_tag(addr);
u8 shadow_byte = READ_ONCE(*(u8 *)kasan_mem_to_shadow(reset_tag(addr)));
u8 shadow_byte = READ_ONCE(*(u8 *)kasan_mem_to_shadow(kasan_reset_tag(addr)));
return (shadow_byte == KASAN_TAG_INVALID) ||
(tag != KASAN_TAG_KERNEL && tag != shadow_byte);
......
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