Re: [PATCH] aio: Fix type of iterator variable in do_io_submit()

[Matthew Wilcox]

On Tue, Apr 22, 2014 at 05:57:03PM -0500, Eric Biggers wrote:
> do_io_submit() iterated over the userspace iocb structure pointers using
> a variable i of type 'int'.  This was wrong since 'nr', the number of
> iocb structure pointers, could potentially be up to LONG_MAX /
> sizeof(struct iocb *).  Fix it (and also remove the unnecessary
> initialization to 0).

You're not wrong, but do we *really* want users to be able to submit
144115188075855872 I/Os with a single system call?  How about limiting
them to a single billion?  Given that they have to allocate 64GB of
*control* data structures to submit this many I/Os, I think this will
be sufficient for many years to come.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/