Changeset 176 for trunk/kernel/mm/kcm.c

Timestamp:

Jul 11, 2017, 12:40:54 PM (7 years ago)

Author:

max@…

Message:

detect use-after-frees

File:

• trunk/kernel/mm/kcm.c (modified) (1 diff)

trunk/kernel/mm/kcm.c

@@ -106 +106 @@
         index = ((uint8_t *)ptr - (uint8_t *)kcm_page - CONFIG_KCM_SLOT_SIZE) / kcm->block_size;
 
+        assert( !bitmap_state( kcm_page->bitmap , index ) , __FUNCTION__ , "page already freed" );
+        assert( (kcm_page->count > 0) , __FUNCTION__ , "count already zero" );
+
         bitmap_set( kcm_page->bitmap , index );
         kcm_page->count --;