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From: Roland McGrath <roland@hack.frob.com>
To: Eric Paris <eparis@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>,
	Eric Paris <eparis@parisplace.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@elte.hu>, Steven Rostedt <rostedt@goodmis.org>,
	Linux-mm <linux-mm@kvack.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Jonathan Corbet <corbet@lwn.net>,
	Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
	Oleg Nesterov <oleg@redhat.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	SystemTap <systemtap@sources.redhat.com>,
	Jim Keniston <jkenisto@linux.vnet.ibm.com>,
	Andi Kleen <andi@firstfloor.org>,
	LKML <linux-kernel@vger.kernel.org>,
	sds@tycho.nsa.gov
Subject: Re: [PATCH v3 2.6.39-rc1-tip 12/26] 12: uprobes: slot allocation for uprobes
Date: Thu, 21 Apr 2011 09:14:42 -0700 (PDT)	[thread overview]
Message-ID: <20110421161442.61A532C15B@topped-with-meat.com> (raw)
In-Reply-To: Eric Paris's message of  Thursday, 21 April 2011 10:45:33 -0400 <1303397133.1708.41.camel@unknown001a4b0c2895>

> Unrelated note: I'd prefer to see that page be READ+EXEC only once it
> has been mapped into the victim task.  Obviously the portion of the code
> that creates this page and sets up the instructions to run is going to
> need write.  Maybe this isn't feasible.  Maybe this magic pages gets
> written a lot even after it's been mapped in.  But I'd rather, if
> possible, know that my victim tasks didn't have a WRITE+EXEC page
> available......

AIUI the page never really needs to be writable in the page tables.  It's
never written from user mode.  It's only written by kernel code, and that
can use a separate momentary kmap to do its writing.


Thanks,
Roland

  reply	other threads:[~2011-04-21 16:28 UTC|newest]

Thread overview: 75+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-04-01 14:32 [PATCH v3 2.6.39-rc1-tip 0/26] 0: Uprobes patchset with perf probe support Srikar Dronamraju
2011-04-01 14:32 ` [PATCH v3 2.6.39-rc1-tip 1/26] 1: mm: replace_page() loses static attribute Srikar Dronamraju
2011-04-01 14:32 ` [PATCH v3 2.6.39-rc1-tip 2/26] 2: mm: Move replace_page() to mm/memory.c Srikar Dronamraju
2011-04-01 14:33 ` [PATCH v3 2.6.39-rc1-tip 3/26] 3: X86 specific breakpoint definitions Srikar Dronamraju
2011-04-01 14:33 ` [PATCH v3 2.6.39-rc1-tip 4/26] 4: uprobes: Breakground page replacement Srikar Dronamraju
2011-04-18 12:20   ` Peter Zijlstra
2011-04-01 14:33 ` [PATCH v3 2.6.39-rc1-tip 5/26] 5: uprobes: Adding and remove a uprobe in a rb tree Srikar Dronamraju
2011-04-18 12:20   ` Peter Zijlstra
2011-04-01 14:33 ` [PATCH v3 2.6.39-rc1-tip 6/26] 6: Uprobes: register/unregister probes Srikar Dronamraju
2011-04-02  0:26   ` Stephen Wilson
2011-04-02  0:53     ` Srikar Dronamraju
2011-04-02  1:29       ` Stephen Wilson
2011-04-18 12:20   ` Peter Zijlstra
2011-04-01 14:33 ` [PATCH v3 2.6.39-rc1-tip 7/26] 7: x86: analyze instruction and determine fixups Srikar Dronamraju
2011-04-19 13:29   ` Steven Rostedt
2011-04-21 17:31     ` Srikar Dronamraju
2011-04-21 17:52       ` Peter Zijlstra
2011-04-01 14:33 ` [PATCH v3 2.6.39-rc1-tip 8/26] 8: uprobes: store/restore original instruction Srikar Dronamraju
2011-04-18 16:12   ` Peter Zijlstra
2011-04-01 14:34 ` [PATCH v3 2.6.39-rc1-tip 9/26] 9: uprobes: mmap and fork hooks Srikar Dronamraju
2011-04-18 16:21   ` Peter Zijlstra
2011-04-18 16:29   ` Peter Zijlstra
2011-04-19  6:45     ` Srikar Dronamraju
2011-04-01 14:34 ` [PATCH v3 2.6.39-rc1-tip 10/26] 10: x86: architecture specific task information Srikar Dronamraju
2011-04-01 14:34 ` [PATCH v3 2.6.39-rc1-tip 11/26] 11: uprobes: task specific information Srikar Dronamraju
2011-04-01 14:34 ` [PATCH v3 2.6.39-rc1-tip 12/26] 12: uprobes: slot allocation for uprobes Srikar Dronamraju
2011-04-18 16:46   ` Peter Zijlstra
2011-04-19  6:26     ` Srikar Dronamraju
2011-04-19  9:02       ` Peter Zijlstra
2011-04-19  9:11       ` Peter Zijlstra
2011-04-20 13:40       ` Eric Paris
2011-04-20 14:51         ` Frank Ch. Eigler
2011-04-20 15:16           ` Stephen Smalley
2011-04-21 14:11         ` Srikar Dronamraju
2011-04-21 14:45           ` Eric Paris
2011-04-21 16:14             ` Roland McGrath [this message]
2011-04-21 16:59             ` Srikar Dronamraju
2011-04-01 14:35 ` [PATCH v3 2.6.39-rc1-tip 13/26] 13: uprobes: get the breakpoint address Srikar Dronamraju
2011-04-18 16:47   ` Peter Zijlstra
2011-04-01 14:35 ` [PATCH v3 2.6.39-rc1-tip 14/26] 14: x86: x86 specific probe handling Srikar Dronamraju
2011-04-18 16:55   ` Peter Zijlstra
2011-04-19  5:43     ` Srikar Dronamraju
2011-04-18 16:57   ` Peter Zijlstra
2011-04-01 14:35 ` [PATCH v3 2.6.39-rc1-tip 15/26] 15: uprobes: Handing int3 and singlestep exception Srikar Dronamraju
2011-04-19 13:03   ` Peter Zijlstra
2011-04-19 13:12     ` Steven Rostedt
2011-04-21 17:10     ` Srikar Dronamraju
2011-04-21 17:41       ` Peter Zijlstra
2011-04-19 13:39   ` Peter Zijlstra
2011-04-21 17:03     ` Srikar Dronamraju
2011-04-01 14:35 ` [PATCH v3 2.6.39-rc1-tip 16/26] 16: x86: uprobes exception notifier for x86 Srikar Dronamraju
2011-04-01 14:35 ` [PATCH v3 2.6.39-rc1-tip 17/26] 17: uprobes: register a notifier for uprobes Srikar Dronamraju
2011-04-19 13:54   ` Peter Zijlstra
2011-04-01 14:36 ` [PATCH v3 2.6.39-rc1-tip 18/26] 18: uprobes: commonly used filters Srikar Dronamraju
2011-04-05  1:26   ` Masami Hiramatsu
2011-04-19 13:57   ` Peter Zijlstra
2011-04-21 11:09     ` Srikar Dronamraju
2011-04-21 11:37       ` Peter Zijlstra
2011-04-21 11:49         ` Srikar Dronamraju
2011-04-01 14:36 ` [PATCH v3 2.6.39-rc1-tip 19/26] 19: tracing: Extract out common code for kprobes/uprobes traceevents Srikar Dronamraju
2011-04-01 14:36 ` [PATCH v3 2.6.39-rc1-tip 20/26] 20: tracing: uprobes trace_event interface Srikar Dronamraju
2011-04-01 14:36 ` [PATCH v3 2.6.39-rc1-tip 21/26] 21: Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Srikar Dronamraju
2011-04-01 14:47   ` [RESEND] [PATCH v3 2.6.39-rc1-tip 21/26] 21: Uprobe tracer documentation " Srikar Dronamraju
2011-04-01 14:36 ` [PATCH v3 2.6.39-rc1-tip 22/26] 22: perf: rename target_module to target Srikar Dronamraju
2011-04-04 10:06   ` Masami Hiramatsu
2011-04-06 23:46     ` Srikar Dronamraju
2011-04-01 14:37 ` [PATCH v3 2.6.39-rc1-tip 23/26] 23: perf: show possible probes in a given executable file or library Srikar Dronamraju
2011-04-04 10:15   ` Masami Hiramatsu
2011-04-06 22:50     ` Srikar Dronamraju
2011-04-01 14:37 ` [PATCH v3 2.6.39-rc1-tip 24/26] 24: perf: perf interface for uprobes Srikar Dronamraju
2011-04-01 14:37 ` [PATCH v3 2.6.39-rc1-tip 25/26] 25: perf: Documentation for perf uprobes Srikar Dronamraju
2011-04-01 14:37 ` [PATCH v3 2.6.39-rc1-tip 26/26] 26: uprobes: filter chain Srikar Dronamraju
2011-04-05  1:27   ` Masami Hiramatsu
2011-04-06 22:41     ` Srikar Dronamraju
2011-04-07  3:19       ` Masami Hiramatsu

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