From: Denys Vlasenko <dvlasenk@redhat.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>, Peter Anvin <hpa@zytor.com>,
Borislav Petkov <bp@suse.de>, Vlastimil Babka <vbabka@suse.cz>,
Tony Luck <tony.luck@intel.com>,
Fenghua Yu <fenghua.yu@intel.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Borislav Petkov <bp@alien8.de>, Brian Gerst <brgerst@gmail.com>,
Jonathan Corbet <corbet@lwn.net>,
"Ravi V. Shankar" <ravi.v.shankar@intel.com>,
ricardo.neri-calderon@linux.intel.com,
Chris Metcalf <cmetcalf@mellanox.com>,
Andrew Morton <akpm@linux-foundation.org>,
Paul Gortmaker <paul.gortmaker@windriver.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Andrew Lutomirski <luto@kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
ray.huang@amd.com, "Michael S. Tsirkin" <mst@redhat.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Chen Yucong <slaoub@gmail.com>, Ingo Molnar <mingo@kernel.org>,
Jiri Slaby <jslaby@suse.cz>, Shuah Khan <shuah@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
"linux-tip-commits@vger.kernel.org"
<linux-tip-commits@vger.kernel.org>
Subject: Re: [tip:x86/asm] x86/umip: Add emulation code for UMIP instructions
Date: Wed, 8 Nov 2017 18:09:29 +0100 [thread overview]
Message-ID: <68c11f7a-cd26-0fdc-0ac5-939a72c22227@redhat.com> (raw)
In-Reply-To: <CA+55aFzwOSbbGpV7dkmkOJ3ScP2pXqkkbPMjzU9qAmVyzSzoAw@mail.gmail.com>
On 11/08/2017 05:57 PM, Linus Torvalds wrote:
> On Wed, Nov 8, 2017 at 8:53 AM, Denys Vlasenko <dvlasenk@redhat.com> wrote:
>> We can postpone enabling UMIP by default by a year or so.
>> By this time, new Wine will be on majority of users' machines.
>
> So you are suggesting we run unnecessarily insecure, only in order to
> not do the emulation that we already have the code for and that the
> patch implements?
We ran insecure in this way for ~25 years.
> Why?
To avoid having to maintain more obscure, rarely executed code.
next prev parent reply other threads:[~2017-11-08 17:09 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-06 2:27 [PATCH v11 00/12] x86: Enable User-Mode Instruction Prevention Ricardo Neri
2017-11-06 2:27 ` [PATCH v11 01/12] x86/insn-eval: Compute linear address in several utility functions Ricardo Neri
2017-11-08 10:57 ` [tip:x86/asm] " tip-bot for Ricardo Neri
2017-11-06 2:27 ` [PATCH v11 02/12] x86/insn-eval: Add support to resolve 32-bit address encodings Ricardo Neri
2017-11-08 10:58 ` [tip:x86/asm] " tip-bot for Ricardo Neri
2017-11-06 2:27 ` [PATCH v11 03/12] x86/insn-eval: Add wrapper function for 32 and 64-bit addresses Ricardo Neri
2017-11-08 10:58 ` [tip:x86/asm] " tip-bot for Ricardo Neri
2017-11-06 2:27 ` [PATCH v11 04/12] x86/insn-eval: Handle 32-bit address encodings in virtual-8086 mode Ricardo Neri
2017-11-08 10:59 ` [tip:x86/asm] " tip-bot for Ricardo Neri
2017-11-06 2:27 ` [PATCH v11 05/12] x86/insn-eval: Add support to resolve 16-bit address encodings Ricardo Neri
2017-11-08 10:59 ` [tip:x86/asm] " tip-bot for Ricardo Neri
2017-11-06 2:27 ` [PATCH v11 06/12] x86/cpufeature: Add User-Mode Instruction Prevention definitions Ricardo Neri
2017-11-08 10:59 ` [tip:x86/asm] " tip-bot for Ricardo Neri
2017-11-06 2:27 ` [PATCH v11 07/12] x86: Add emulation code for UMIP instructions Ricardo Neri
2017-11-08 11:00 ` [tip:x86/asm] x86/umip: " tip-bot for Ricardo Neri
2017-11-08 16:14 ` Denys Vlasenko
2017-11-08 16:34 ` Linus Torvalds
2017-11-08 16:38 ` H. Peter Anvin
2017-11-08 16:53 ` Denys Vlasenko
2017-11-08 16:57 ` Linus Torvalds
2017-11-08 17:09 ` Denys Vlasenko [this message]
2017-11-08 17:14 ` Paolo Bonzini
2017-11-08 17:24 ` Denys Vlasenko
2017-11-09 6:17 ` Ricardo Neri
2017-11-08 17:24 ` Alan Cox
2017-11-09 6:13 ` Ricardo Neri
2017-11-09 6:11 ` Ricardo Neri
2017-11-06 2:27 ` [PATCH v11 08/12] x86/umip: Force a page fault when unable to copy emulated result to user Ricardo Neri
2017-11-08 11:00 ` [tip:x86/asm] " tip-bot for Ricardo Neri
2017-11-06 2:27 ` [PATCH v11 09/12] x86: Enable User-Mode Instruction Prevention at runtime Ricardo Neri
2017-11-08 9:52 ` Ingo Molnar
2017-11-09 5:51 ` Ricardo Neri
2017-11-08 11:01 ` [tip:x86/asm] x86/umip: " tip-bot for Ricardo Neri
2017-11-06 2:27 ` [PATCH v11 10/12] x86/traps: Fixup general protection faults caused by UMIP Ricardo Neri
2017-11-08 11:01 ` [tip:x86/asm] x86/traps: Fix up " tip-bot for Ricardo Neri
2017-11-06 2:27 ` [PATCH v11 11/12] selftests/x86: Add tests for User-Mode Instruction Prevention Ricardo Neri
2017-11-08 11:02 ` [tip:x86/asm] " tip-bot for Ricardo Neri
2017-11-06 2:27 ` [PATCH v11 12/12] selftests/x86: Add tests for instruction str and sldt Ricardo Neri
2017-11-08 11:02 ` [tip:x86/asm] selftests/x86: Add tests for the STR and SLDT instructions tip-bot for Ricardo Neri
2017-11-08 10:00 ` [PATCH v11 00/12] x86: Enable User-Mode Instruction Prevention Thomas Gleixner
2017-11-09 5:46 ` Ricardo Neri
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