OpenBSD Errata: June 17th, 2018 (intelfpu)

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OpenBSD Errata: June 17th, 2018 (intelfpu)

T.J. Townsend
Errata patches for x86 floating-point units have been released for OpenBSD 6.3.

Intel CPUs speculatively access FPU registers even when the FPU is disabled,
so data (including AES keys) from previous contexts could be discovered if
using the lazy-save approach.

Binary updates for the amd64 platform are available via the syspatch utility.
Source code patches can be found on the errata page:

  https://www.openbsd.org/errata63.html

As this affects the kernel, a reboot will be needed after patching.

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Re: OpenBSD Errata: June 17th, 2018 (intelfpu)

Theo Buehler-5
On Sun, Jun 17, 2018 at 09:29:48AM -0400, T.J. Townsend wrote:

> Errata patches for x86 floating-point units have been released for OpenBSD 6.3.
>
> Intel CPUs speculatively access FPU registers even when the FPU is disabled,
> so data (including AES keys) from previous contexts could be discovered if
> using the lazy-save approach.
>
> Binary updates for the amd64 platform are available via the syspatch utility.
> Source code patches can be found on the errata page:
>
>   https://www.openbsd.org/errata63.html
>
> As this affects the kernel, a reboot will be needed after patching.
>

Errata patches and binary updates for this issue are now also available
for OpenBSD 6.2/amd64:

  https://www.openbsd.org/errata62.html