MDEV-19471 Add ASAN-poisoned redzones for mem_heap_t

Store REDZONE_SIZE poined bytes before every allocated chunk of memory

storage/innobase/include/mem0mem.h

@@ -73,7 +73,7 @@ allocations of small buffers. */
 
 /** If a memory heap is allowed to grow into the buffer pool, the following
 is the maximum size for a single allocated buffer: */
-#define MEM_MAX_ALLOC_IN_BUF		(UNIV_PAGE_SIZE - 200)
+#define MEM_MAX_ALLOC_IN_BUF		(UNIV_PAGE_SIZE - 200 + REDZONE_SIZE)
 
 /** Space needed when allocating for a user a field of length N.
 The space is allocated only in multiples of UNIV_MEM_ALIGNMENT.  */

storage/innobase/include/mem0mem.ic

@@ -183,13 +183,15 @@ mem_heap_alloc(
 	ulint		n)
 {
 	mem_block_t*	block;
-	void*		buf;
+	byte*		buf;
 	ulint		free;
 
 	ut_d(mem_block_validate(heap));
 
 	block = UT_LIST_GET_LAST(heap->base);
 
+	n += REDZONE_SIZE;
+
 	ut_ad(!(block->type & MEM_HEAP_BUFFER) || (n <= MEM_MAX_ALLOC_IN_BUF));
 
 	/* Check if there is enough space in block. If not, create a new
@@ -212,7 +214,8 @@ mem_heap_alloc(
 
 	mem_block_set_free(block, free + MEM_SPACE_NEEDED(n));
 
-	UNIV_MEM_ALLOC(buf, n);
+	buf = buf + REDZONE_SIZE;
+	UNIV_MEM_ALLOC(buf, n - REDZONE_SIZE);
 	return(buf);
 }
 
@@ -341,6 +344,8 @@ mem_heap_free_top(
 
 	ut_d(mem_block_validate(heap));
 
+	n += REDZONE_SIZE;
+
 	block = UT_LIST_GET_LAST(heap->base);
 
 	/* Subtract the free field of block */

storage/innobase/log/log0recv.cc

@@ -61,7 +61,7 @@ Created 9/20/1997 Heikki Tuuri
 
 /** Log records are stored in the hash table in chunks at most of this size;
 this must be less than UNIV_PAGE_SIZE as it is stored in the buffer pool */
-#define RECV_DATA_BLOCK_SIZE	(MEM_MAX_ALLOC_IN_BUF - sizeof(recv_data_t))
+#define RECV_DATA_BLOCK_SIZE	(MEM_MAX_ALLOC_IN_BUF - sizeof(recv_data_t) - REDZONE_SIZE)
 
 /** Read-ahead area in applying log records to file pages */
 #define RECV_READ_AHEAD_AREA	32