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SubjectRe: [RFC PATCH v2] x86/arch_prctl: Add ARCH_SET_XCR0 to set XCR0 per-thread
On Tue, Apr 14, 2020 at 5:10 PM Keno Fischer <> wrote:
> > (why would you want to record with an unusual XCR0?)

Hmm. I don't personally have a strong objection to allowing XCR0 to
be overridden as long as it's done reasonably sanely. And maybe
requires a sysctl to be enabled.

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?

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