powerpc/kuap: Wire-up KUAP on 40x

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This adds KUAP support to 40x. This is done by checking
the content of SPRN_PID at the time user pgtable is loaded.

40x doesn't have KUEP, but KUAP implies KUEP because when the
PID doesn't match the page's PID, the page cannot be read nor
executed.

So KUEP is now automatically selected when KUAP is selected and
disabled when KUAP is disabled.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/aaefa91897ddc42ac11019dc0e1d1a525bd08e90.1634627931.git.christophe.leroy@csgroup.eu

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This commit is contained in:

Christophe Leroy 2021-10-19 09:29:30 +02:00 • committed by Michael Ellerman

parent f6fad4fb55

commit fcf9bb6d32

3 changed files with 15 additions and 2 deletions

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8

arch/powerpc/kernel/head_40x.S

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2

arch/powerpc/mm/nohash/kup.c

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7

arch/powerpc/platforms/Kconfig.cputype

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