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Date: Wed, 15 Apr 2020 21:16:56 -0400 From: Keno Fischer <keno@...iacomputing.com> To: Andy Lutomirski <luto@...nel.org> Cc: Dave Hansen <dave.hansen@...el.com>, Peter Zijlstra <peterz@...radead.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, Andi Kleen <andi@...stfloor.org>, Kyle Huey <khuey@...ehuey.com>, "Robert O'Callahan" <robert@...llahan.org> Subject: Re: [RFC PATCH v2] x86/arch_prctl: Add ARCH_SET_XCR0 to set XCR0 per-thread On Wed, Apr 15, 2020 at 9:14 PM Keno Fischer <keno@...iacomputing.com> wrote: > > > Would it make matters easier if tasks with nonstandard XCR0 were not > > allowed to use ptrace() at all? And if ARCH_SET_XCR0 were disallowed > > if the caller is tracing anyone? > > That would be fine by me (as long as you're still allowed to ptrace them of > course). Sorry, I realized after I had hit send that this wording may not be clear. What I meant was that it would need to be able to have an external ptracer (with unmodified XCR0) attach to the task, even if it had modified its XCR0. I don't think you were suggesting that that wouldn't be possible, but I just wanted to make sure.
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