Re: [PATCH] x86/asm/entry/32: Restore %ss before SYSRETL if necessary

[Denys Vlasenko]

On Fri, Apr 24, 2015 at 1:04 AM, Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
> And at that point,> the only cost is a a single no-op on most CPU's (we still don't know
> _which_ AMD CPU's are affected, but I guess we could start off with
> all of them and see if we can get an exhaustive list some way).

This seems to be "architectural" for AMD CPU's, similar to Intel's
SYSRET bug with non-canonical return address. Meaning,
both bugs, are documented by respective
companies. Both are officially "not a bug, but a feature".
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