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-rw-r--r--mm/kasan/shadow.c37
1 files changed, 22 insertions, 15 deletions
diff --git a/mm/kasan/shadow.c b/mm/kasan/shadow.c
index 1ed7817e4ee6..63f43443f5d7 100644
--- a/mm/kasan/shadow.c
+++ b/mm/kasan/shadow.c
@@ -69,7 +69,7 @@ void *memcpy(void *dest, const void *src, size_t len)
return __memcpy(dest, src, len);
}
-void kasan_poison(const void *address, size_t size, u8 value)
+void kasan_poison(const void *addr, size_t size, u8 value)
{
void *shadow_start, *shadow_end;
@@ -78,55 +78,62 @@ void kasan_poison(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 = kasan_reset_tag(address);
+ addr = kasan_reset_tag(addr);
/* Skip KFENCE memory if called explicitly outside of sl*b. */
- if (is_kfence_address(address))
+ if (is_kfence_address(addr))
return;
- size = round_up(size, KASAN_GRANULE_SIZE);
- shadow_start = kasan_mem_to_shadow(address);
- shadow_end = kasan_mem_to_shadow(address + size);
+ if (WARN_ON((unsigned long)addr & KASAN_GRANULE_MASK))
+ return;
+ if (WARN_ON(size & KASAN_GRANULE_MASK))
+ return;
+
+ shadow_start = kasan_mem_to_shadow(addr);
+ shadow_end = kasan_mem_to_shadow(addr + size);
__memset(shadow_start, value, shadow_end - shadow_start);
}
EXPORT_SYMBOL(kasan_poison);
#ifdef CONFIG_KASAN_GENERIC
-void kasan_poison_last_granule(const void *address, size_t size)
+void kasan_poison_last_granule(const void *addr, size_t size)
{
if (size & KASAN_GRANULE_MASK) {
- u8 *shadow = (u8 *)kasan_mem_to_shadow(address + size);
+ u8 *shadow = (u8 *)kasan_mem_to_shadow(addr + size);
*shadow = size & KASAN_GRANULE_MASK;
}
}
#endif
-void kasan_unpoison(const void *address, size_t size)
+void kasan_unpoison(const void *addr, size_t size)
{
- u8 tag = get_tag(address);
+ u8 tag = get_tag(addr);
/*
* Perform shadow offset calculation based on untagged address, as
* some of the callers (e.g. kasan_unpoison_object_data) pass tagged
* addresses to this function.
*/
- address = kasan_reset_tag(address);
+ addr = kasan_reset_tag(addr);
/*
* Skip KFENCE memory if called explicitly outside of sl*b. Also note
* that calls to ksize(), where size is not a multiple of machine-word
* size, would otherwise poison the invalid portion of the word.
*/
- if (is_kfence_address(address))
+ if (is_kfence_address(addr))
+ return;
+
+ if (WARN_ON((unsigned long)addr & KASAN_GRANULE_MASK))
return;
- /* Unpoison round_up(size, KASAN_GRANULE_SIZE) bytes. */
- kasan_poison(address, size, tag);
+ /* Unpoison all granules that cover the object. */
+ kasan_poison(addr, round_up(size, KASAN_GRANULE_SIZE), tag);
/* Partially poison the last granule for the generic mode. */
if (IS_ENABLED(CONFIG_KASAN_GENERIC))
- kasan_poison_last_granule(address, size);
+ kasan_poison_last_granule(addr, size);
}
#ifdef CONFIG_MEMORY_HOTPLUG