powerpc/book3s64/kuap: Restrict access to userspace based on userspace AMR

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If an application has configured address protection such that read/write is
denied using pkey even the kernel should receive a FAULT on accessing the same.

This patch use user AMR value stored in pt_regs.amr to achieve the same.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Reviewed-by: Sandipan Das <sandipan@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201127044424.40686-16-aneesh.kumar@linux.ibm.com

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Aneesh Kumar K.V 2020-11-27 10:14:17 +05:30 • committed by Michael Ellerman

parent 48a8ab4eeb

commit 4d6c551e9f

1 changed files with 9 additions and 3 deletions

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arch/powerpc/include/asm/book3s/64/kup.h

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