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kasan: simplify address description logic

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Simplify logic for describing a memory address.  Add addr_to_page()
helper function.

Makes the code easier to follow.

Link: http://lkml.kernel.org/r/20170302134851.101218-5-andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Acked-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrey Konovalov 2017-05-03 14:56:34 -07:00 committed by Linus Torvalds
parent b6b72f4919
commit db429f16e0
1 changed files with 21 additions and 16 deletions
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37
mm/kasan/report.c
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@ -190,11 +190,18 @@ static void print_track(struct kasan_track *track, const char *prefix)
}
}
static void kasan_object_err(struct kmem_cache *cache, void *object)
static struct page *addr_to_page(const void *addr)
{
if ((addr >= (void *)PAGE_OFFSET) &&
(addr < high_memory))
return virt_to_head_page(addr);
return NULL;
}
static void describe_object(struct kmem_cache *cache, void *object)
{
struct kasan_alloc_meta *alloc_info = get_alloc_info(cache, object);
dump_stack();
pr_err("Object at %p, in cache %s size: %d\n", object, cache->name,
cache->object_size);
@ -213,34 +220,32 @@ void kasan_report_double_free(struct kmem_cache *cache, void *object,
kasan_start_report(&flags);
pr_err("BUG: Double free or freeing an invalid pointer\n");
pr_err("Unexpected shadow byte: 0x%hhX\n", shadow);
kasan_object_err(cache, object);
dump_stack();
describe_object(cache, object);
kasan_end_report(&flags);
}
static void print_address_description(struct kasan_access_info *info)
{
const void *addr = info->access_addr;
struct page *page = addr_to_page(addr);
if ((addr >= (void *)PAGE_OFFSET) &&
(addr < high_memory)) {
struct page *page = virt_to_head_page(addr);
if (PageSlab(page)) {
void *object;
struct kmem_cache *cache = page->slab_cache;
object = nearest_obj(cache, page,
(void *)info->access_addr);
kasan_object_err(cache, object);
return;
}
if (page)
dump_page(page, "kasan: bad access detected");
dump_stack();
if (page && PageSlab(page)) {
struct kmem_cache *cache = page->slab_cache;
void *object = nearest_obj(cache, page, (void *)addr);
describe_object(cache, object);
}
if (kernel_or_module_addr(addr)) {
if (!init_task_stack_addr(addr))
pr_err("Address belongs to variable %pS\n", addr);
}
dump_stack();
}
static bool row_is_guilty(const void *row, const void *guilty)