powerpc/8xx: fix handling of early NULL pointer dereference

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NULL pointers are pointers to user memory space. So user pagetable
has to be set in order to avoid random behaviour in case of NULL
pointer dereference, otherwise we may encounter random memory
access hence Machine Check Exception from TLB Miss handlers.

Set user pagetable as early as possible in order to properly
catch early kernel NULL pointer dereference.

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 2018-07-13 13:10:47 +00:00 • committed by Michael Ellerman

parent ce57c6610c

commit 8c8c10b90d

1 changed files with 4 additions and 3 deletions

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arch/powerpc/kernel/head_8xx.S

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