s390/mm,pageattr: add more page table walk sanity checks

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The current page table walk code in pageattr.c only checks for large pages
while walking the kernel page table, but happily assumes that everything
else is just fine.
Add more checks so we never access invalid memory regions.

Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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Heiko Carstens 2012-10-01 16:18:46 +02:00 • committed by Martin Schwidefsky

parent 378b1e7a80

commit 5b1ba9e30c

1 changed files with 25 additions and 12 deletions

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arch/s390/mm/pageattr.c

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