powerpc/mm: add exec protection on powerpc 603

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The 603 doesn't have a HASH table, TLB misses are handled by
software. It is then possible to generate page fault when
_PAGE_EXEC is not set like in nohash/32.

There is one "reserved" PTE bit available, this patch uses
it for _PAGE_EXEC.

In order to support it, set_pte_filter() and
set_access_flags_filter() are made common, and the handling
is made dependent on MMU_FTR_HPTE_TABLE

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

...

This commit is contained in:

Christophe Leroy 2018-11-28 17:21:10 +00:00 • committed by Michael Ellerman

parent badb9687ce

commit 385e89d5b2

6 changed files with 26 additions and 25 deletions

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1

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

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18

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

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8

arch/powerpc/include/asm/cputable.h

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2

arch/powerpc/kernel/head_32.S

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2

arch/powerpc/mm/dump_linuxpagetables-generic.c

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20

arch/powerpc/mm/pgtable.c

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