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| author | Stephen Rothwell <sfr@canb.auug.org.au> | 2009-02-03 10:52:12 +1100 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2009-02-03 10:52:12 +1100 |
| commit | 8d8e883a284bc6aaba2284bbc98b7b35a5220115 (patch) | |
| tree | a8a1eb2724f527ff0b5f111046ddf217d3f50a46 /include | |
| parent | d9e3236cf2debe025e6f852b6587e999382e51aa (diff) | |
| parent | f0e31e6745b616a10e67bef651307ab858a25d8e (diff) | |
Merge commit 'safe-poison-pointers/auto-safe-poison-pointers-next'
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/poison.h | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/include/linux/poison.h b/include/linux/poison.h index 9f31683728fd..f2de9a999f4a 100644 --- a/include/linux/poison.h +++ b/include/linux/poison.h @@ -2,13 +2,25 @@ #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 **********/ /* |