set_tag() already ignores the tag for the generic mode, so just call it as is. Add a check for the generic mode to assign_tag(), and simplify its call in ____kasan_kmalloc(). Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx> Reviewed-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Link: https://linux-review.googlesource.com/id/I18905ca78fb4a3d60e1a34a4ca00247272480438 --- mm/kasan/common.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/mm/kasan/common.c b/mm/kasan/common.c index 69ab880abacc..40ff3ce07a76 100644 --- a/mm/kasan/common.c +++ b/mm/kasan/common.c @@ -238,6 +238,9 @@ void __kasan_poison_object_data(struct kmem_cache *cache, void *object) static u8 assign_tag(struct kmem_cache *cache, const void *object, bool init, bool keep_tag) { + if (IS_ENABLED(CONFIG_KASAN_GENERIC)) + return 0xff; + /* * 1. When an object is kmalloc()'ed, two hooks are called: * kasan_slab_alloc() and kasan_kmalloc(). We assign the @@ -280,8 +283,8 @@ void * __must_check __kasan_init_slab_obj(struct kmem_cache *cache, __memset(alloc_meta, 0, sizeof(*alloc_meta)); } - if (IS_ENABLED(CONFIG_KASAN_SW_TAGS) || IS_ENABLED(CONFIG_KASAN_HW_TAGS)) - object = set_tag(object, assign_tag(cache, object, true, false)); + /* Tag is ignored in set_tag() without CONFIG_KASAN_SW/HW_TAGS */ + object = set_tag(object, assign_tag(cache, object, true, false)); return (void *)object; } @@ -362,9 +365,7 @@ static void *____kasan_kmalloc(struct kmem_cache *cache, const void *object, KASAN_GRANULE_SIZE); redzone_end = round_up((unsigned long)object + cache->object_size, KASAN_GRANULE_SIZE); - - if (IS_ENABLED(CONFIG_KASAN_SW_TAGS) || IS_ENABLED(CONFIG_KASAN_HW_TAGS)) - tag = assign_tag(cache, object, false, keep_tag); + tag = assign_tag(cache, object, false, keep_tag); /* Tag is ignored in set_tag without CONFIG_KASAN_SW/HW_TAGS */ kasan_unpoison_memory(set_tag(object, tag), size); -- 2.29.2.222.g5d2a92d10f8-goog
