Merge branch 'linus' into cont_syslog

[safe/jmp/linux-2.6] / include / linux / poison.h

diff --git a/include/linux/poison.h b/include/linux/poison.h
index a9c31be..34066ff 100644 (file)
--- a/include/linux/poison.h
+++ b/include/linux/poison.h
@@ -2,13 +2,35 @@
 #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 *) 0x00100100)
-#define LIST_POISON2  ((void *) 0x00200200)
+#define LIST_POISON1  ((void *) 0x00100100 + POISON_POINTER_DELTA)
+#define LIST_POISON2  ((void *) 0x00200200 + 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 *) 0x74737461)
+
+/********** mm/debug-pagealloc.c **********/
+#define PAGE_POISON 0xaa
 
 /********** mm/slab.c **********/
 /*
@@ -26,6 +48,15 @@
 #define POISON_FREE    0x6b    /* for use-after-free poisoning */
 #define        POISON_END      0xa5    /* end-byte of poisoning */
 
+/********** mm/hugetlb.c **********/
+/*
+ * Private mappings of hugetlb pages use this poisoned value for
+ * page->mapping. The core VM should not be doing anything with this mapping
+ * but futex requires the existence of some page->mapping value even though it
+ * is unused if PAGE_MAPPING_ANON is set.
+ */
+#define HUGETLB_POISON ((void *)(0x00300300 + POISON_POINTER_DELTA + PAGE_MAPPING_ANON))
+
 /********** arch/$ARCH/mm/init.c **********/
 #define POISON_FREE_INITMEM    0xcc
 
@@ -55,6 +86,9 @@
 #define MUTEX_DEBUG_INIT       0x11
 #define MUTEX_DEBUG_FREE       0x22
 
+/********** lib/flex_array.c **********/
+#define FLEX_ARRAY_FREE        0x6c    /* for use-after-free poisoning */
+
 /********** security/ **********/
 #define KEY_DESTROY            0xbd