Changes slab object description from:
Object at ffff880068388540, in cache kmalloc-128 size: 128
to:
The buggy address belongs to the object at ffff880068388540
which belongs to the cache kmalloc-128 of size 128
The buggy address is located 123 bytes inside of
128-byte region [ffff880068388540, ffff8800683885c0)
Makes it more explanatory and adds information about relative offset
of the accessed address to the start of the object.
Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
---
mm/kasan/report.c | 53 ++++++++++++++++++++++++++++++++++++++++++-----------
1 file changed, 42 insertions(+), 11 deletions(-)
diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index 945d0e13e8a4..8dfb7a060d69 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -196,18 +196,49 @@ static struct page *addr_to_page(const void *addr)
return NULL;
}
-static void describe_object(struct kmem_cache *cache, void *object)
+static void describe_object_addr(struct kmem_cache *cache, void *object,
+ const void *addr)
{
- struct kasan_alloc_meta *alloc_info = get_alloc_info(cache, object);
+ unsigned long access_addr = (unsigned long)addr;
+ unsigned long object_addr = (unsigned long)object;
+ const char *rel_type;
+ int rel_bytes;
- pr_err("Object at %p, in cache %s size: %d\n", object, cache->name,
- cache->object_size);
+ pr_err("The buggy address belongs to the object at %p\n"
+ " which belongs to the cache %s of size %d\n",
+ object, cache->name, cache->object_size);
- if (!(cache->flags & SLAB_KASAN))
+ if (!addr)
return;
- print_track(&alloc_info->alloc_track, "Allocated");
- print_track(&alloc_info->free_track, "Freed");
+ if (access_addr < object_addr) {
+ rel_type = "to the left";
+ rel_bytes = object_addr - access_addr;
+ } else if (access_addr >= object_addr + cache->object_size) {
+ rel_type = "to the right";
+ rel_bytes = access_addr - (object_addr + cache->object_size);
+ } else {
+ rel_type = "inside";
+ rel_bytes = access_addr - object_addr;
+ }
+
+ pr_err("The buggy address is located %d bytes %s of\n"
+ " %d-byte region [%p, %p)\n",
+ rel_bytes, rel_type, cache->object_size, (void *)object_addr,
+ (void *)(object_addr + cache->object_size));
+}
+
+static void describe_object(struct kmem_cache *cache, void *object,
+ const void *addr)
+{
+ struct kasan_alloc_meta *alloc_info = get_alloc_info(cache, object);
+
+ if (cache->flags & SLAB_KASAN) {
+ print_track(&alloc_info->alloc_track, "Allocated");
+ print_track(&alloc_info->free_track, "Freed");
+ }
+
+ describe_object_addr(cache, object, addr);
}
void kasan_report_double_free(struct kmem_cache *cache, void *object,
@@ -219,13 +250,13 @@ void kasan_report_double_free(struct kmem_cache *cache, void *object,
pr_err("BUG: Double free or freeing an invalid pointer\n");
pr_err("Unexpected shadow byte: 0x%hhX\n", shadow);
dump_stack();
- describe_object(cache, object);
+ describe_object(cache, object, NULL);
kasan_end_report(&flags);
}
static void print_address_description(struct kasan_access_info *info)
{
- const void *addr = info->access_addr;
+ void *addr = (void *)info->access_addr;
struct page *page = addr_to_page(addr);
if (page)
@@ -235,9 +266,9 @@ static void print_address_description(struct kasan_access_info *info)
if (page && PageSlab(page)) {
struct kmem_cache *cache = page->slab_cache;
- void *object = nearest_obj(cache, page, (void *)addr);
+ void *object = nearest_obj(cache, page, addr);
- describe_object(cache, object);
+ describe_object(cache, object, addr);
}
if (kernel_or_module_addr(addr)) {
--
2.12.0.rc1.440.g5b76565f74-goog
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