powerpc/8xx: Activate KUEP at all time

Browse source

On the 8xx, there is absolutely no runtime impact with KUEP. Protection
against execution of user code in kernel mode is set up at boot time
by configuring the groups with contain all user pages as having swapped
protection rights, in extenso EX for user and NA for supervisor.

Configure KUEP at startup and force selection of CONFIG_PPC_KUEP.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/2129e86944323ffe9ed07fffbeafdfd2e363690a.1634627931.git.christophe.leroy@csgroup.eu

...

This commit is contained in:

Christophe Leroy 2021-10-19 09:29:13 +02:00 • committed by Michael Ellerman

parent 6c1fa60d36

commit 13dac4e31e

3 changed files with 3 additions and 9 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

6

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

View file

5

arch/powerpc/mm/nohash/8xx.c

View file

1

arch/powerpc/platforms/Kconfig.cputype

View file