Hide a pointer to the malloc_type bucket at the end of the freed memory. If

this memory is modified after it has been freed we can now report it's
previous owner.

1 files changed, 7 insertions, 0 deletions

diff --git a/sys/vm/uma_dbg.h b/sys/vm/uma_dbg.h
index fed04a6..7967a44 100644
--- a/sys/vm/uma_dbg.h
+++ b/sys/vm/uma_dbg.h
@@ -43,6 +43,13 @@ void trash_ctor(void *mem, int size, void *arg);
 void trash_dtor(void *mem, int size, void *arg);
 void trash_init(void *mem, int size);
 void trash_fini(void *mem, int size);
+
+/* For use only by malloc */
+void mtrash_ctor(void *mem, int size, void *arg);
+void mtrash_dtor(void *mem, int size, void *arg);
+void mtrash_init(void *mem, int size);
+void mtrash_fini(void *mem, int size);
+
 void uma_dbg_free(uma_zone_t zone, uma_slab_t slab, void *item);
 void uma_dbg_alloc(uma_zone_t zone, uma_slab_t slab, void *item);