linux-kernel - Re: [PATCH 1/5] ptrace/x86: Revert "hw_breakpoints: Fix racy access to ptrace breakpoints"

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Date:	Mon, 15 Apr 2013 11:31:03 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jan Kratochvil <jan.kratochvil@...hat.com>,
	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	Prasad <prasad@...ux.vnet.ibm.com>,
	Russell King <linux@....linux.org.uk>,
	Will Deacon <will.deacon@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] ptrace/x86: Revert "hw_breakpoints: Fix racy access
 to ptrace breakpoints"


* Oleg Nesterov <oleg@...hat.com> wrote:

> This reverts commit 87dc669ba25777b67796d7262c569429e58b1ed4.
> 
> The patch was fine but we can no longer race with SIGKILL after
> 9899d11f "ptrace: ensure arch_ptrace/ptrace_request can never race
> with SIGKILL", the __TASK_TRACED tracee can't be woken up and
> ->ptrace_bps[] can't go away.
> 
> The patch only removes ptrace_get_breakpoints/ptrace_put_breakpoints
> and does a couple of "while at it" cleanups, it doesn't remove other
> changes from the reverted commit.
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>
> ---
>  arch/x86/kernel/ptrace.c |   28 +++++-----------------------
>  1 files changed, 5 insertions(+), 23 deletions(-)

Acked-by: Ingo Molnar <mingo@...nel.org>

Thanks,

	Ingo
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