| From | Greg Kroah-Hartman <> | Subject | [ 38/83] s390/gup: add missing TASK_SIZE check to get_user_pages_fast() | Date | Wed, 21 Nov 2012 16:42:00 -0800 |
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3.6-stable review patch. If anyone has any objections, please let me know.
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From: Heiko Carstens <heiko.carstens@de.ibm.com>
commit d55c4c613fc4d4ad2ba0fc6fa2b57176d420f7e4 upstream.
When walking page tables we need to make sure that everything is within bounds of the ASCE limit of the task's address space. Otherwise we might calculate e.g. a pud pointer which is not within a pud and dereference it. So check against TASK_SIZE (which is the ASCE limit) before walking page tables.
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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/s390/mm/gup.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/s390/mm/gup.c +++ b/arch/s390/mm/gup.c @@ -183,7 +183,7 @@ int get_user_pages_fast(unsigned long st addr = start; len = (unsigned long) nr_pages << PAGE_SHIFT; end = start + len; - if (end < start) + if ((end < start) || (end > TASK_SIZE)) goto slow_irqon; /*
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