From: "H. Peter Anvin" <hpa@zytor.com>
To: Borislav Petkov <bp@alien8.de>, Ren Qiaowei <qiaowei.ren@intel.com>
Cc: 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 08:31:16 -0800 [thread overview]
Message-ID: <52D95AD4.6060603@zytor.com> (raw)
In-Reply-To: <20140113103808.GC5388@pd.tnic>
On 01/13/2014 02:38 AM, Borislav Petkov wrote:
> On Mon, Jan 13, 2014 at 11:17:15AM +0800, Ren Qiaowei wrote:
>> Yes, I run this with lockdep enabled.
>
> Ok, but you still are doing memory allocation in the exception handler,
> AFAICT:
>
Sure... what is the problem with that? We do that in several other
exception handlers, e.g. #NM, and of course page faults. As long as the
exception originates from user space there shouldn't be any issue.
-hpa
next prev parent reply other threads:[~2014-01-17 16:31 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 [this message]
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
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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