linux-kernel - Re: [PATCH, RFC] random: introduce getrandom(2) system call

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Message-ID: <CAComcpOkWLPJGDXWuYrC4Gtk02H_81qwSUzzM87qkx-tf6PUhQ@mail.gmail.com>
Date:	Thu, 17 Jul 2014 11:46:45 -0600
From:	Bob Beck <beck@...nbsd.org>
To:	"Theodore Ts'o" <tytso@....edu>, Bob Beck <beck@...nbsd.org>,
	Christoph Hellwig <hch@...radead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-abi <linux-abi@...r.kernel.org>,
	linux-crypto <linux-crypto@...r.kernel.org>
Subject: Re: [PATCH, RFC] random: introduce getrandom(2) system call

And thanks btw.

I don't suppose you guys know who we should talk to about possibly
getting MAP_INHERIT_ZERO minherit() support?

On Thu, Jul 17, 2014 at 11:45 AM, Bob Beck <beck@...nbsd.org> wrote:
> we have diffs pending that will do the syscall method until we start
> to see it in libc :)
>
> So basically we're going to put that in right away :)
>
> On Thu, Jul 17, 2014 at 11:34 AM, Theodore Ts'o <tytso@....edu> wrote:
>> On Thu, Jul 17, 2014 at 11:05:01AM -0600, Bob Beck wrote:
>>> Hi Ted, yeah I understand the reasoning, it would be good if there was
>>> a way to influence the various libc people to
>>> ensure they manage to provide a getentropy().
>>
>> I don't anticipate that to be a problem.  And before they do, and/or
>> if you are dealing with a system where the kernel has been upgraded,
>> but not libc, you have your choice of either sticking with the
>> binary_sysctl approach, or calling getrandom directly using the
>> syscall method; and in that case, whether we use getrandom() or
>> provide an exact getentropy() replacement system call isn't that much
>> difference, since you'd have to have Linux-specific workaround code
>> anyway....
>>
>>                                 - Ted
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