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(parent: 6d4bbce) | patch
powerpc/32s: Implement Kernel Userspace Execution Prevention.
authorChristophe Leroy <christophe.leroy@c-s.fr>
Mon, 11 Mar 2019 08:30:35 +0000 (08:30 +0000)
committerMichael Ellerman <mpe@ellerman.id.au>
Sun, 21 Apr 2019 13:11:46 +0000 (23:11 +1000)
commit9b6aae0bfb0ba5e48be65629d29d8e4143b4d68f
tree80890f996c246cd567e2822230b68340919adebftree | snapshot
parent6d4bbce6c5e68bd0ed67b0fbbe64951f7c27362ecommit | diff
powerpc/32s: Implement Kernel Userspace Execution Prevention.

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>
arch/powerpc/include/asm/book3s/32/kup.h [new file with mode: 0644] blob
arch/powerpc/include/asm/book3s/32/mmu-hash.h diff | blob | history
arch/powerpc/include/asm/kup.h diff | blob | history
arch/powerpc/kernel/entry_32.S diff | blob | history
arch/powerpc/kernel/head_32.S diff | blob | history
arch/powerpc/mm/ppc_mmu_32.c diff | blob | history
arch/powerpc/platforms/Kconfig.cputype diff | blob | history
Linux Kernel Source Tree.