Re: ipc,sem: sysv semaphore scalability

[Linus Torvalds]

On Tue, Apr 2, 2013 at 9:08 AM, Sasha Levin <sasha.levin@xxxxxxxxxx> wrote:
>
> By just playing with the 'msgsz' parameter with MSG_COPY set.

Hmm. Looking closer, I suspect you're testing without commit
88b9e456b164 ("ipc: don't allocate a copy larger than max"). That
should limit the size passed in to prepare_copy -> load_copy to
msg_ctlmax.

Now, I think it's possibly still a good idea to limit bufsz to INT_MAX
regardless, but as far as I can see that prepare_copy -> load_copy
path is the only place that can get confused. Everybody else uses
size_t (or "long" in the case of r_maxsize) as far as I can tell.

        Linus
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