Intel backdoor: not a bug, a feature (buy a new processor!!!)

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Re: Intel backdoor: not a bug, a feature (buy a new processor!!!)

Unread postby robespierre » Wed Feb 14, 2018 1:59 pm

tomvos wrote:Spectre and Meltdown do not affect the Mill. ... tre.03.pdf

The paper is actually not so sanguine. They found that to prevent data being exposed by Spectre code, they had to change the rules used by the binary specializer. They also changed (made more explicit) the restrictions on the protection checks preceding cache ops.
If your attitude is that Spectre is a compiler bug and that changes to the compiler will take care of it, how is that different from x64 Linux with retpoline? If you just redefine your architecture to exclude known attacks, how does that speak to its integrity against future attacks? It's easy to change a paper architecture, not so much after it's in production.
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Re: Intel backdoor: not a bug, a feature (buy a new processor!!!)

Unread postby ClassicHasClass » Thu Feb 15, 2018 8:08 am

Atleast the Alpha, MIPS and SPARC aren't affected by this foolishness.

Not sure if you mean Spectre or Meltdown, but at least some MIPS and SPARC designs are affected by Spectre. Meltdown, no.

However, Raptor CS has gone out and said it: POWER8 and POWER9 was patched for Meltdown; see also . However, it isn't clear if Meltdown is a factor for POWER4 through POWER7 (POWER7+ might be), or the PowerPC 970, and because the G3 and 7400 G4 are not vulnerable (or at least are highly resistant) to Spectre they are also not vulnerable to Meltdown.
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