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Open Source and information security mailing list archives
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Date: Tue, 15 Nov 2022 22:21:04 +0100 From: Peter Zijlstra <peterz@...radead.org> To: Dave Hansen <dave.hansen@...el.com> Cc: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>, "bsingharora@...il.com" <bsingharora@...il.com>, "hpa@...or.com" <hpa@...or.com>, "Syromiatnikov, Eugene" <esyr@...hat.com>, "rdunlap@...radead.org" <rdunlap@...radead.org>, "keescook@...omium.org" <keescook@...omium.org>, "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>, "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>, "Eranian, Stephane" <eranian@...gle.com>, "linux-mm@...ck.org" <linux-mm@...ck.org>, "fweimer@...hat.com" <fweimer@...hat.com>, "nadav.amit@...il.com" <nadav.amit@...il.com>, "jannh@...gle.com" <jannh@...gle.com>, "dethoma@...rosoft.com" <dethoma@...rosoft.com>, "rppt@...ux.ibm.com" <rppt@...ux.ibm.com>, "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>, "kcc@...gle.com" <kcc@...gle.com>, "bp@...en8.de" <bp@...en8.de>, "oleg@...hat.com" <oleg@...hat.com>, "hjl.tools@...il.com" <hjl.tools@...il.com>, "Yang, Weijiang" <weijiang.yang@...el.com>, "Lutomirski, Andy" <luto@...nel.org>, "pavel@....cz" <pavel@....cz>, "arnd@...db.de" <arnd@...db.de>, "tglx@...utronix.de" <tglx@...utronix.de>, "mike.kravetz@...cle.com" <mike.kravetz@...cle.com>, "x86@...nel.org" <x86@...nel.org>, "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>, "jamorris@...ux.microsoft.com" <jamorris@...ux.microsoft.com>, "rppt@...nel.org" <rppt@...nel.org>, "john.allen@....com" <john.allen@....com>, "mingo@...hat.com" <mingo@...hat.com>, "Shankar, Ravi V" <ravi.v.shankar@...el.com>, "corbet@....net" <corbet@....net>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>, "gorcunov@...il.com" <gorcunov@...il.com>, "akpm@...ux-foundation.org" <akpm@...ux-foundation.org> Subject: Re: [PATCH v3 36/37] x86/cet/shstk: Add ARCH_CET_UNLOCK On Tue, Nov 15, 2022 at 01:00:40PM -0800, Dave Hansen wrote: > On 11/15/22 12:57, Peter Zijlstra wrote: > > On Tue, Nov 15, 2022 at 08:01:12PM +0000, Edgecombe, Rick P wrote: > >>>> + if (task != current) { > >>>> + if (option == ARCH_CET_UNLOCK && > >>>> IS_ENABLED(CONFIG_CHECKPOINT_RESTORE)) { > >>> Why make this conditional on CRIU at all? > >> Kees asked for it, I think he was worried about attackers using it to > >> unlock and disable shadow stack. So wanted to lock it down to the > >> maximum. > > Well, distros will all have this stuff enabled no? So not much > > protection in practise. > > Yeah, that's true for the distros. > > But, I would imagine that our more paranoid friends like the ChromeOS > folks might appreciate this. ptrace can modify text, I'm not sure what if anything we're protecting against.
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