Messages in this thread | | | Date | Thu, 29 Nov 2018 15:42:22 +0100 (CET) | From | Jiri Kosina <> | Subject | Re: [PATCH v2 4/4] x86/static_call: Add inline static call implementation for x86-64 |
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On Thu, 29 Nov 2018, Peter Zijlstra wrote:
> > int3 isn’t IST anymore, so the int3 instruction conditionally > > subtracts 8 from RSP and then pushes SS, etc. So my email was > > obviously wrong wrt “cs”, but you’re still potentially overwriting the > > int3 IRET frame. > > ARGH!.. > > can't we 'fix' that again? The alternative is moving that IRET-frame and > fixing everything up, which is going to be fragile, ugly and such > things more. > > Commit d8ba61ba58c8 ("x86/entry/64: Don't use IST entry for #BP stack") > doesn't list any strong reasons for why it should NOT be an IST.
It's CVE-2018-8897.
-- Jiri Kosina SUSE Labs
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