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powerpc/32s: Implement Kernel Userspace Execution Prevention.

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To implement Kernel Userspace Execution Prevention, this patch
sets NX bit on all user segments on kernel entry and clears NX bit
on all user segments on kernel exit.

Note that powerpc 601 doesn't have the NX bit, so KUEP will not
work on it. A warning is displayed at startup.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy
2019-03-11 08:30:35 +00:00
committed by Michael Ellerman
parent 2679f9bd0a
commit 31ed2b13c4
7 changed files with 85 additions and 1 deletions
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3
arch/powerpc/include/asm/kup.h
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@@ -8,6 +8,9 @@
#ifdef CONFIG_PPC_8xx
#include <asm/nohash/32/kup-8xx.h>
#endif
#ifdef CONFIG_PPC_BOOK3S_32
#include <asm/book3s/32/kup.h>
#endif
#ifdef __ASSEMBLY__
#ifndef CONFIG_PPC_KUAP