[RFC PATCH v4] ARM: uprobes xol write directly to userspace
davem at davemloft.net
Wed Apr 16 12:37:34 PDT 2014
From: Oleg Nesterov <oleg at redhat.com>
Date: Wed, 16 Apr 2014 21:18:25 +0200
> The last question... area->page = alloc_page(GFP_HIGHUSER), and I am
> not sure that arch/arm/mm/highmem.c:kmap_atomic() can't break the
> aliasing, __fix_to_virt() in this case will use the same (per-cpu) idx.
> Looks like, __kunmap_atomic()->__cpuc_flush_dcache_area() should take
> care, but could you please ack/nack my understanding?
Good point, it might therefore make sense to use a low-mem page.
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