[Buildroot] [PATCH] util-linux: Revert genrandom(2) logic

[Matthew Weber]

Marcus,

On Mon, Aug 14, 2017 at 4:54 AM, Marcus Hoffmann
<m.hoffmann at cartelsol.com> wrote:
> Hey Matt, Arnout,
>
> On 12.08.2017 18:00, Arnout Vandecappelle wrote:
>>
>>
>> On 12-08-17 05:01, Matt Weber wrote:
>>> New logic was added at configure time and new conditional code
>>> in lib/randutils.c between versions 2.29.2 and >= 2.30.  The logic
>>> determines if the glibc or syscall API should be used for
>>> rand calls.  This has been observed causing issues in a
>>> configuration of a 4.1 kernel and glibc2.25.  A tool like
>>> parted when used at boot hangs for ~40x the time and when
>>> debugged with gdb shows blocking on genrandom, even though
>>                                       getrandom
>>
>>> a entropy check from a hardware rng used by rngd is adequate
>>> before the parted tool is used.
>>>
>>> Bug tracker:
>>> https://github.com/karelzak/util-linux/issues/496
>>>
>>> Upstream reverted commits
>>> https://git.kernel.org/pub/scm/utils/util-linux/util-linux.git/commit/?h=stable/v2.30&id=b192dd6943e5bb5d2a3773b2c9b06cbd4eb28258
>>> https://git.kernel.org/pub/scm/utils/util-linux/util-linux.git/commit/?h=stable/v2.30&id=cc01c2dca4f62e36505570d5cb15f868aa44bf54
>>>
>>> Signed-off-by: Matthew Weber <matthew.weber at rockwellcollins.com>
>>
>>  To be honest, I don't think we want this in Buildroot. It's rather a feature
>> patch, and it is absolutely not upstreamable in its current form. Also, you can
>> easily keep these patches in your BR2_GLOBAL_PATCH_DIR
>
> A fix for this was just added by Karel:
> https://github.com/karelzak/util-linux/commit/5264aebb4f822fa9147ee576562a4961ca97261d
>
> @Matt, can you test it?

Will give a try now

Matt