X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=include%2Flinux%2Fpoison.h;fp=include%2Flinux%2Fpoison.h;h=851a855d386884177eb50db59a67821168c2258d;hb=b5fd066153c40a70a29caa1ea7987723ab687763;hp=0000000000000000000000000000000000000000;hpb=06ff8b55b70fda44d91b31b5511fafd1680a8934;p=bcachefs-tools-debian

diff --git a/include/linux/poison.h b/include/linux/poison.h
new file mode 100644
index 0000000..851a855
--- /dev/null
+++ b/include/linux/poison.h
@@ -0,0 +1,93 @@
+/* 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 *) 0x122 + POISON_POINTER_DELTA)
+
+/********** include/linux/timer.h **********/
+#define TIMER_ENTRY_STATIC	((void *) 0x300 + POISON_POINTER_DELTA)
+
+/********** mm/page_poison.c **********/
+#define PAGE_POISON 0xaa
+
+/********** 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)
+
+/********** security/ **********/
+#define KEY_DESTROY		0xbd
+
+/********** net/core/page_pool.c **********/
+#define PP_SIGNATURE		(0x40 + POISON_POINTER_DELTA)
+
+/********** net/core/skbuff.c **********/
+#define SKB_LIST_POISON_NEXT	((void *)(0x800 + POISON_POINTER_DELTA))
+
+/********** kernel/bpf/ **********/
+#define BPF_PTR_POISON ((void *)(0xeB9FUL + POISON_POINTER_DELTA))
+
+/********** VFS **********/
+#define VFS_PTR_POISON ((void *)(0xF5 + POISON_POINTER_DELTA))
+
+#endif