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

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Message-ID: <CAComcpPTRoHr3C7r7tdte+j94PmUw7VrptTVOg8uEsT-hTFuzA@mail.gmail.com>
Date:	Thu, 17 Jul 2014 11:57:59 -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

Or perhaps to put that another way, since you don't do minherit -
maybe a FORK_ZERO for madvise? or a similar way
to do that?


On Thu, Jul 17, 2014 at 11:46 AM, Bob Beck <beck@...nbsd.org> wrote:
> 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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