Re: [PATCH 2/2] Perform check in iov_iter_fault_in_readable() bycheck_readable_bytes()

[Alan Cox]

> System calls don't trigger SIGSEGVs so they can't rely on that when
> calling read().  I'm not sure how they handle that.

Usually by touching the pages before the syscall. (You can't rely on
-EFAULT either in POSIX, its optional that it bothers to tell you and for
example on MMUless it may well not)

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