Bug#1017425: [PATCH] x86/speculation: Avoid LFENCE in FILL_RETURN_BUFFER on CPUs that lack it
On Fri, Aug 19, 2022 at 2:01 PM Peter Zijlstra <peterz@infradead.org> wrote:
> I'm not entirly sure what to do here. On the one hand, it's 32bit, so
> who gives a crap, otoh we shouldn't break these ancient chips either I
> suppose.
This is something that I've repeatedly had to bring up, whenever
something breaks because someone meant well by enabling more security
bells and whistles:
x86-32 is by definition legacy hardware. Enabling more bells and
whistles essentially kills support for all but the very latest
variants of the x86-32 family. This is the wrong approach. The right
approach is to accept that building for x86-32 inherently means
building for older and thus less secure architectures.
Martin-Éric
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