linux-kernel - [PATCH 0/7] uprobes/x86: introduce uprobe_xol_ops and arch

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Message-ID: <20140331194337.GA9257@redhat.com>
Date:	Mon, 31 Mar 2014 21:43:37 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	David Long <dave.long@...aro.org>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Jim Keniston <jkenisto@...ibm.com>,
	Jonathan Lebon <jlebon@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/7] uprobes/x86: introduce uprobe_xol_ops and
	arch_uprobe->ops

Hello.

x86 can not handle the rip-relative jmp/call instrsuctions, the probed
task can be killed by general protection fault. I'll describe this in
more details when I send the fixes. Now I am sending the preparations
which (I hope) make sense anyway, please review.

My main concern is 3/7. I know absolutely nothing about instruction
decoding, so I can only guess what, for example, OPCODE1() == 0xff or
MODRM_REG() == 2 actually means. Please review.

Ananth, David, please ack/nack the first change, it affects powerpc/arm.

Oleg.

 arch/x86/include/asm/uprobes.h |    7 +-
 arch/x86/kernel/uprobes.c      |  343 ++++++++++++++++++++--------------------
 kernel/events/uprobes.c        |   23 +---
 3 files changed, 176 insertions(+), 197 deletions(-)

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