powerpc/8xx: Add Kernel Userspace Execution Prevention

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This patch adds Kernel Userspace Execution Prevention on the 8xx.

When a page is Executable, it is set Executable for Key 0 and NX
for Key 1.

Up to now, the User group is defined with Key 0 for both User and
Supervisor.

By changing the group to Key 0 for User and Key 1 for Supervisor,
this patch prevents the Kernel from being able to execute user code.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Christophe Leroy 2019-03-11 08:30:33 +00:00 • committed by Michael Ellerman

parent c341a108a5

commit 06fbe81b59

3 changed files with 20 additions and 0 deletions

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7

arch/powerpc/include/asm/nohash/32/mmu-8xx.h

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12

arch/powerpc/mm/8xx_mmu.c

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1

arch/powerpc/platforms/Kconfig.cputype

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