Messages in this thread |  | | Subject | Re: [RFCv2 2/4] Documentation: document nospec helpers | From | Randy Dunlap <> | Date | Sat, 6 Jan 2018 21:20:59 -0800 |
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On 01/05/18 06:57, Mark Rutland wrote: > Document the rationale and usage of the new nospec*() helpers. > > Signed-off-by: Mark Rutland <mark.rutland@arm.com> > Signed-off-by: Will Deacon <will.deacon@arm.com> > Cc: Dan Williams <dan.j.williams@intel.com> > Cc: Jonathan Corbet <corbet@lwn.net> > Cc: Peter Zijlstra <peterz@infradead.org> > --- > Documentation/speculation.txt | 166 ++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 166 insertions(+) > create mode 100644 Documentation/speculation.txt > > diff --git a/Documentation/speculation.txt b/Documentation/speculation.txt > new file mode 100644 > index 000000000000..748fcd4dcda4 > --- /dev/null > +++ b/Documentation/speculation.txt > @@ -0,0 +1,166 @@ > + > +Typically speculative execution cannot be observed from architectural state, > +such as the contents of registers. However, in some cases it is possible to > +observe its impact on microarchitectural state, such as the presence or > +absence of data in caches. Such state may form side-channels which can be > +observed to extract secret information.
I'm curious about what it takes to observe this...
or is that covered in the exploit papers?
thanks, -- ~Randy
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