v4.19.13 snapshot.
diff --git a/include/linux/poison.h b/include/linux/poison.h
new file mode 100644
index 0000000..15927eb
--- /dev/null
+++ b/include/linux/poison.h
@@ -0,0 +1,92 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_POISON_H
+#define _LINUX_POISON_H
+
+/********** include/linux/list.h **********/
+
+/*
+ * Architectures might want to move the poison pointer offset
+ * into some well-recognized area such as 0xdead000000000000,
+ * that is also not mappable by user-space exploits:
+ */
+#ifdef CONFIG_ILLEGAL_POINTER_VALUE
+# define POISON_POINTER_DELTA _AC(CONFIG_ILLEGAL_POINTER_VALUE, UL)
+#else
+# define POISON_POINTER_DELTA 0
+#endif
+
+/*
+ * These are non-NULL pointers that will result in page faults
+ * under normal circumstances, used to verify that nobody uses
+ * non-initialized list entries.
+ */
+#define LIST_POISON1 ((void *) 0x100 + POISON_POINTER_DELTA)
+#define LIST_POISON2 ((void *) 0x200 + POISON_POINTER_DELTA)
+
+/********** include/linux/timer.h **********/
+/*
+ * Magic number "tsta" to indicate a static timer initializer
+ * for the object debugging code.
+ */
+#define TIMER_ENTRY_STATIC ((void *) 0x300 + POISON_POINTER_DELTA)
+
+/********** mm/debug-pagealloc.c **********/
+#ifdef CONFIG_PAGE_POISONING_ZERO
+#define PAGE_POISON 0x00
+#else
+#define PAGE_POISON 0xaa
+#endif
+
+/********** mm/page_alloc.c ************/
+
+#define TAIL_MAPPING ((void *) 0x400 + POISON_POINTER_DELTA)
+
+/********** mm/slab.c **********/
+/*
+ * Magic nums for obj red zoning.
+ * Placed in the first word before and the first word after an obj.
+ */
+#define RED_INACTIVE 0x09F911029D74E35BULL /* when obj is inactive */
+#define RED_ACTIVE 0xD84156C5635688C0ULL /* when obj is active */
+
+#define SLUB_RED_INACTIVE 0xbb
+#define SLUB_RED_ACTIVE 0xcc
+
+/* ...and for poisoning */
+#define POISON_INUSE 0x5a /* for use-uninitialised poisoning */
+#define POISON_FREE 0x6b /* for use-after-free poisoning */
+#define POISON_END 0xa5 /* end-byte of poisoning */
+
+/********** arch/$ARCH/mm/init.c **********/
+#define POISON_FREE_INITMEM 0xcc
+
+/********** arch/ia64/hp/common/sba_iommu.c **********/
+/*
+ * arch/ia64/hp/common/sba_iommu.c uses a 16-byte poison string with a
+ * value of "SBAIOMMU POISON\0" for spill-over poisoning.
+ */
+
+/********** fs/jbd/journal.c **********/
+#define JBD_POISON_FREE 0x5b
+#define JBD2_POISON_FREE 0x5c
+
+/********** drivers/base/dmapool.c **********/
+#define POOL_POISON_FREED 0xa7 /* !inuse */
+#define POOL_POISON_ALLOCATED 0xa9 /* !initted */
+
+/********** drivers/atm/ **********/
+#define ATM_POISON_FREE 0x12
+#define ATM_POISON 0xdeadbeef
+
+/********** kernel/mutexes **********/
+#define MUTEX_DEBUG_INIT 0x11
+#define MUTEX_DEBUG_FREE 0x22
+#define MUTEX_POISON_WW_CTX ((void *) 0x500 + POISON_POINTER_DELTA)
+
+/********** lib/flex_array.c **********/
+#define FLEX_ARRAY_FREE 0x6c /* for use-after-free poisoning */
+
+/********** security/ **********/
+#define KEY_DESTROY 0xbd
+
+#endif