From: "H. Peter Anvin" <hpa@zytor.com>
To: Borislav Petkov <bp@alien8.de>
Cc: Ren Qiaowei <qiaowei.ren@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/5] x86, mpx: hook #BR exception handler to allocate bound tables
Date: Fri, 17 Jan 2014 10:25:45 -0800 [thread overview]
Message-ID: <52D975A9.7050201@zytor.com> (raw)
In-Reply-To: <20140117182321.GJ8715@pd.tnic>
On 01/17/2014 10:23 AM, Borislav Petkov wrote:
> On Fri, Jan 17, 2014 at 09:30:45AM -0800, H. Peter Anvin wrote:
>> Yes. It would take some serious effort to get BOUND or MPX
>> instructions into the kernel -- you'd have to put them in inline
>> assembly, and BOUND doesn't even exist in 64-bit mode.
>
> Which reminds me - we will have to explicitly turn off any compiler
> switches that utilize MPX insns so that they don't get issued when
> building the kernel. Provided there will be compiler support, that is.
>
There will be, whether or not it will be on by default is another matter.
Either way, the kernel would have to explicitly enable the use MPX
instructions in kernel space or they are simply treated as NOPs.
-hpa
next prev parent reply other threads:[~2014-01-17 18:26 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-12 9:19 [PATCH 1/5] x86, mpx: add documentation on Intel MPX Qiaowei Ren
2014-01-12 9:20 ` [PATCH 2/5] x86, mpx: hook #BR exception handler to allocate bound tables Qiaowei Ren
2014-01-12 9:20 ` Borislav Petkov
2014-01-13 3:17 ` Ren Qiaowei
2014-01-13 10:38 ` Borislav Petkov
2014-01-17 14:47 ` Ren, Qiaowei
2014-01-17 16:47 ` Borislav Petkov
2014-01-17 16:51 ` H. Peter Anvin
2014-01-17 17:14 ` Steven Rostedt
2014-01-17 17:51 ` H. Peter Anvin
2014-01-19 12:50 ` Ren, Qiaowei
2014-01-17 17:10 ` Steven Rostedt
2014-01-17 16:31 ` H. Peter Anvin
2014-01-17 16:48 ` Borislav Petkov
2014-01-17 16:51 ` H. Peter Anvin
2014-01-17 16:56 ` Borislav Petkov
2014-01-17 16:58 ` H. Peter Anvin
2014-01-17 17:04 ` Borislav Petkov
2014-01-17 17:30 ` H. Peter Anvin
2014-01-17 18:23 ` Borislav Petkov
2014-01-17 18:25 ` H. Peter Anvin [this message]
2014-01-12 9:20 ` [PATCH 3/5] x86, mpx: add prctl commands PR_MPX_INIT, PR_MPX_RELEASE Qiaowei Ren
2014-01-12 9:20 ` [PATCH 4/5] x86, mpx: add MPX related opcodes to the x86 opcode map Qiaowei Ren
2014-01-17 19:04 ` H. Peter Anvin
2014-01-17 19:22 ` [tip:x86/mpx] x86, mpx: Add " tip-bot for Qiaowei Ren
2014-01-12 9:20 ` [PATCH 5/5] x86, mpx: extend siginfo structure to include bound violation information Qiaowei Ren
2014-01-12 9:30 ` Borislav Petkov
2014-01-12 16:49 ` H. Peter Anvin
2014-01-12 17:03 ` Borislav Petkov
2014-01-12 17:06 ` H. Peter Anvin
2014-01-13 3:09 ` Ren Qiaowei
2014-01-13 8:22 ` Ren Qiaowei
2014-01-13 10:43 ` Borislav Petkov
2014-01-17 14:55 ` Ren, Qiaowei
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