Re: [PATCH v4 9/9] powerpc/64s: Implement KUAP for Radix MMU

2019-02-28 Thread kbuild test robot
Hi Russell, I love your patch! Yet something to improve: [auto build test ERROR on powerpc/next] [cannot apply to v5.0-rc8 next-20190228] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Michael-

[PATCH v4 9/9] powerpc/64s: Implement KUAP for Radix MMU

2019-02-28 Thread Michael Ellerman
From: Russell Currey Kernel Userspace Access Prevention utilises a feature of the Radix MMU which disallows read and write access to userspace addresses. By utilising this, the kernel is prevented from accessing user data from outside of trusted paths that perform proper safety checks, such as co