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RE: [XEN PATCH v1] libxl: use getrandom() syscall for random data extraction
- To: Julien Grall <julien@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Sergiy Kibrik <Sergiy_Kibrik@xxxxxxxx>
- Date: Wed, 26 May 2021 09:31:23 +0000
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- Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
- Delivery-date: Wed, 26 May 2021 09:31:33 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [XEN PATCH v1] libxl: use getrandom() syscall for random data extraction
Hi Julien,
>
> From the man:
>
> VERSIONS
> getrandom() was introduced in version 3.17 of the Linux kernel.
> Support was added to glibc in version 2.25.
>
> If I am not mistaken glibc 2.25 was released in 2017. Also, the call was only
> introduced in FreeBSD 12.
>
> So I think we want to check if getrandom() can be used. We may also want to
> consider to fallback to read /dev/urandom if the call return ENOSYS.
>
You mean its availability should be checked both at build and runtime?
--
regards,
Sergiy
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