Re: [PATCH -mm 3/3] proc: make task_sig() lockless

[David Howells]

Roland McGrath <roland@xxxxxxxxxx> wrote:

> I'm not so sure.  Operations like sigprocmask and sigaction really have
> always been entirely atomic from the userland perspective before.  Now it
> becomes possible to read from /proc e.g. a blocked set that never existed
> as such (one word updated by sigprocmask but not yet the next word).

If you have a small userspace buffer, that was previously possible too.

David
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