Messages in this thread | | | Subject | Re: [RFC PATCH v2] Fix: x86: Add missing core serializing instruction on migration | From | Benjamin Herrenschmidt <> | Date | Mon, 13 Nov 2017 10:51:47 +1100 |
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On Mon, 2017-11-13 at 10:26 +1100, Benjamin Herrenschmidt wrote: > On Sat, 2017-11-11 at 10:03 -0500, Mathieu Desnoyers wrote: > > x86 has a missing core serializing instruction in migration scenarios. > > > > Given that x86-32 can return to user-space with sysexit, and x86-64 > > through sysretq and sysretl, which are not core serializing, the > > following user-space self-modifiying code (JIT) scenario can occur: > > Is this about load/store consistency ? In this case, don't you also > have problems with get/put_user and not just going to userspace ?
Ah forget it, I saw Linus earlier messages.
Cheers, Ben.
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