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Re: [XEN PATCH v1] libxl: use getrandom() syscall for random data extraction


On 24/05/2021 09:58, Sergiy Kibrik wrote:
Simplify libxl__random_bytes() routine by using a newer dedicated syscall.
This allows not only to substantially reduce its footprint, but syscall also
considered to be safer and generally better solution:


getrandom() available on Linux, FreeBSD and NetBSD.

From the man:

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.


Julien Grall



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