From: Keno Fischer <keno@juliacomputing.com>
To: Andy Lutomirski <luto@kernel.org>
Cc: Dave Hansen <dave.hansen@intel.com>,
Peter Zijlstra <peterz@infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
<x86@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
Andi Kleen <andi@firstfloor.org>, Kyle Huey <khuey@kylehuey.com>,
"Robert O'Callahan" <robert@ocallahan.org>
Subject: Re: [RFC PATCH v2] x86/arch_prctl: Add ARCH_SET_XCR0 to set XCR0 per-thread
Date: Wed, 15 Apr 2020 21:14:50 -0400 [thread overview]
Message-ID: <CABV8kRzbGgF4Uc9+VyzBUiH-kGfMALd8tDtjE3hjyE2Z5VD3-g@mail.gmail.com> (raw)
In-Reply-To: <CALCETrWTDrcynTwpWZ6u6JXRL1rz6_vakLK7=BqMjCPCkQ+9dg@mail.gmail.com>
> 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). I do think that using the kernel XCR0 is the best choice, but since
I don't really have a use case for it, I'm happy to disallow that and
let anybody who does have a use case come back here and
argue for it one way or the other.
next prev parent reply other threads:[~2020-04-16 1:16 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-07 1:12 [RFC PATCH v2] x86/arch_prctl: Add ARCH_SET_XCR0 to set XCR0 per-thread Keno Fischer
2020-04-07 3:57 ` Andy Lutomirski
2020-04-07 4:44 ` Keno Fischer
2020-04-07 4:53 ` Kyle Huey
2020-04-07 12:33 ` Peter Zijlstra
2020-04-07 13:52 ` Keno Fischer
2020-04-07 12:21 ` Peter Zijlstra
2020-04-07 14:06 ` Dave Hansen
2020-04-07 14:16 ` Andy Lutomirski
2020-04-07 18:30 ` Keno Fischer
2020-04-14 23:20 ` Andy Lutomirski
2020-04-15 0:09 ` Keno Fischer
2020-04-16 1:07 ` Andy Lutomirski
2020-04-16 1:14 ` Keno Fischer [this message]
2020-04-16 1:16 ` Keno Fischer
2020-04-16 1:22 ` Andy Lutomirski
2020-04-07 16:29 ` Kyle Huey
2020-04-07 13:14 ` Dave Hansen
[not found] ` <CABV8kRw1TQsqs+z43bSfZ5isctuFGMB4g_ztDYihiiXHcy4nVA@mail.gmail.com>
2020-04-07 16:27 ` Dave Hansen
2020-04-07 17:55 ` Keno Fischer
2020-04-07 20:21 ` Dave Hansen
2020-04-07 21:42 ` Andy Lutomirski
2020-04-07 22:15 ` Keno Fischer
2020-04-14 19:55 ` Keno Fischer
2020-04-07 14:20 ` Andi Kleen
2020-04-07 18:06 ` Keno Fischer
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