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>

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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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42

arch/powerpc/include/asm/book3s/32/kup.h

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3

arch/powerpc/include/asm/book3s/32/mmu-hash.h

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3

arch/powerpc/include/asm/kup.h

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9

arch/powerpc/kernel/entry_32.S

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15

arch/powerpc/kernel/head_32.S

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13

arch/powerpc/mm/ppc_mmu_32.c

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1

arch/powerpc/platforms/Kconfig.cputype

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