Comment 1 for bug 567956

From alkml:

Jamie Lokier [jamie at shareable.org] wrote:
[...]
The above patch addresses ARMv6/v7 with NX mappings - and probably only those > TASK_SIZE; NX mappings < TASK_SIZE should have been caught by the PROT_EXEC check already in fault.c.
If I'm right, the NX one is more serious if you can trip a kernel bug into doing this, because it'll result in an unkillable process, stuck in kernel mode and spinning. But only if you trip a kernel bug.

So it looks like it cound be worth pulling this patch in but SRU is probably good enough— this only becomes a problem if there is already a kernel bug somewhere involving a jump to a random address.