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Date: Fri, 8 Dec 2017 17:29:08 +0000 From: David Laight <David.Laight@...LAB.COM> To: 'Andy Lutomirski' <luto@...nel.org> CC: Peter Zijlstra <peterz@...radead.org>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>, X86 ML <x86@...nel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Brian Gerst <brgerst@...il.com>, Kees Cook <keescook@...omium.org> Subject: RE: [PATCH] LDT improvements From: Andy Lutomirski > Sent: 08 December 2017 16:48 ... > I mean: if the user CS or SS is not accessed and the LDT is RO, then > we get #PF on the IRET instruction, I think. Dealing with that is > truly awful. Any fault in-kernel on the IRET is horrid. Doesn't really matter which one. Same goes for the 'pop %ds' (etc) that tend to precede it. David
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