linux-kernel - Re: [PATCH 1/3] uprobes: install_breakpoint() should fail if is_swbp

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Date:	Thu, 31 May 2012 14:15:18 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Oleg Nesterov <oleg@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anton Arapov <anton@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] uprobes: install_breakpoint() should fail if
 is_swbp_insn() == T

On Wed, 2012-05-30 at 19:49 +0200, Peter Zijlstra wrote:
> 
> Oh, indeed. I overlooked copy_insn() is taking the page from the
> page-cache instead of the page-tables and will thus get the original.
> 

Related to this, what happens when we try to install a probe on a page
that's already been COWed by a ptrace user?

Say gdb did a code modification at or near the intended probe site.
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