linux-kernel - [PATCH 0/7] uprobes: single-step fixes

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Message-ID: <20120903152525.GA9028@redhat.com>
Date:	Mon, 3 Sep 2012 17:25:25 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anton Arapov <anton@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Roland McGrath <roland@...k.frob.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/7] uprobes: single-step fixes

Hello.

In short: uprobes should not use user_enable/disable_single_step().
This is unneeded and wrong.

Sebastian, I changed your patches a bit:

	1/7:

		- Change the subject and update the changelog. In particular,
		  s/utrace/uprobes/. I am wondering where this typo came from ;)

	2/7:

		- Rename UPROBE_TF_CHANGES to UPROBE_FIX_SETF to match other
		  *_FIX_* defines.

		- Update the changelog.

		- !!!REMOVE send_sig(SIGTRAP) from arch_uprobe_disable_step!!!
		  Didn't I ask you to make a separate patch for this change? ;)

		  This "else send_sig(SIGTRAP)" is very wrong. Just suppose an
		  application does asm ("pushf; popf") and the 2nd insn is probed.
		  And otoh this is not enough.

		  See 6/7.

please let me know if you disagree.

Oleg.

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