--- Sent using a tiny phone keyboard. Apologies for any typos and autocorrect. Also, this old phone only supports top post. Apologies. Cy Schubert <Cy.Schubert_at_cschubert.com> or <cy_at_freebsd.org> The need of the many outweighs the greed of the few. --- -----Original Message----- From: Zaphod Beeblebrox Sent: 02/01/2018 15:50 To: Michael Butler Cc: FreeBSD Current Subject: Re: Intel CPU design flaw - FreeBSD affected? >From the information that was leaked by AMD claiming that their processors didn't have the flaws, it would seem any OS in which the kernel occupies the same address space as the userland would be vulnerable. The AMD post implied that Intel's speculative execution of code did not check the validity of the operands before speculatively executing the code. I suppose the implication is that the security check "catches up" with the speculative execution at some point ... and that their (AMD's) microcode did check. Anyways... for those keeping score at home, this is a privilege escalation bug... so it's only really useful in concert with other bugs ... but still pretty huge. Some estimate that between 5% and 30% performance degradation may be unavoidable. Some say it's worse or can't be fully fixed. Certainly, the sunk cost of current CPUs is a huge issue for server farm vendors like Amazon and/or google. On Tue, Jan 2, 2018 at 6:13 PM, Michael Butler <imb_at_protected-networks.net> wrote: > Has any impact assessment been made as to FreeBSD's exposure or > mitigation strategies? > > 'Kernel memory leaking' Intel processor design flaw forces Linux, > Windows redesign - The Register > > https://www.theregister.co.uk/2018/01/02/intel_cpu_design_flaw/ > > _______________________________________________ freebsd-current_at_freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscribe_at_freebsd.org"Received on Tue Jan 02 2018 - 23:29:02 UTC
This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:41:14 UTC