2015-08-18 19:50:20

by Jeffrey Vander Stoep

Subject: [PATCH v2] arm64 Kconfig: Move LIST_POISON to a safe value

Move the poison pointer offset to 0xdead000000000000, a
recognized value that is not mappable by user-space exploits.

Signed-off-by: Thierry Strudel <[email protected]>
Signed-off-by: Jeff Vander Stoep <[email protected]>
---
v2 removes an extra newline.

arch/arm64/Kconfig | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 318175f..8f1789c 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -104,6 +104,10 @@ config NO_IOPORT_MAP
config STACKTRACE_SUPPORT
def_bool y

+config ILLEGAL_POINTER_VALUE
+ hex
+ default 0xdead000000000000
+
config LOCKDEP_SUPPORT
def_bool y

--
2.5.0.276.gf5e568e

2015-08-19 09:13:12

by Catalin Marinas

Subject: Re: [PATCH v2] arm64 Kconfig: Move LIST_POISON to a safe value

On Tue, Aug 18, 2015 at 12:50:10PM -0700, Jeff Vander Stoep wrote:
> Move the poison pointer offset to 0xdead000000000000, a
> recognized value that is not mappable by user-space exploits.
>
> Signed-off-by: Thierry Strudel <[email protected]>
> Signed-off-by: Jeff Vander Stoep <[email protected]>
> ---

Acked-by: Catalin Marinas <[email protected]>