linux-kernel - Re: [PATCH 3/7] uprobes: Do not delete uprobe if uprobe

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Message-ID: <20121006084858.GA9145@linux.vnet.ibm.com>
Date:	Sat, 6 Oct 2012 14:18:58 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anton Arapov <anton@...hat.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/7] uprobes: Do not delete uprobe if
 uprobe_unregister() fails

* Oleg Nesterov <oleg@...hat.com> [2012-09-30 21:42:04]:

> delete_uprobe() must not be called if register_for_each_vma(false)
> fails to remove all breakpoints, __uprobe_unregister() is correct.
> The problem is that register_for_each_vma(false) always returns 0
> and thus this logic does not work.
> 
> 1. Change verify_opcode() to return 0 rather than -EINVAL when
>    unregister detects the !is_swbp insn, we can treat this case
>    as success and currently unregister paths ignore the error
>    code anyway.
> 
> 2. Change remove_breakpoint() to propagate the error code from
>    write_opcode().
> 
> 3. Change register_for_each_vma(is_register => false) to remove
>    as much breakpoints as possible but return non-zero if
>    remove_breakpoint() fails at least once.
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>

Acked-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>

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