linux-kernel - Re: [RFC PATCH 5/6] uprobes: add bp_vaddr argument to consumer handler

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Message-ID: <20121222163545.GE18082@redhat.com>
Date:	Sat, 22 Dec 2012 17:35:45 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Anton Arapov <anton@...hat.com>
Cc:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Josh Stone <jistone@...hat.com>, Frank Eigler <fche@...hat.com>
Subject: Re: [RFC PATCH 5/6] uprobes: add bp_vaddr argument to consumer
	handler

On 12/21, Anton Arapov wrote:
>
>  struct uprobe_consumer {
> -	int (*handler)(struct uprobe_consumer *self, struct pt_regs *regs);
> +	int (*handler)(struct uprobe_consumer *self, unsigned long bp_vaddr, struct pt_regs *regs);

It seems that we can do better...

Just change regs->ip before calling ->handler(). In both cases we are
going to change it again, so ->ip doesn't matter.

Initially I though we can't do this for uretprobes, but it seems we can.

I won't insist though.

Oleg.

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