linux-kernel - Re: [PATCH 1/3] Kprobes: Make kprobe modules more portable

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Message-Id: <1155139305.8345.20.camel@dhcp-2.hsv.redhat.com>
Date:	Wed, 09 Aug 2006 11:01:45 -0500
From:	David Smith <dsmith@...hat.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	linux-kernel@...r.kernel.org, shemminger@...l.org
Subject: Re: [PATCH 1/3] Kprobes: Make kprobe modules more portable

On Tue, 2006-08-08 at 17:24 +0100, Christoph Hellwig wrote:
> On Mon, Aug 07, 2006 at 05:25:37PM +0530, Ananth N Mavinakayanahalli wrote:

... stuff deleted ...

>  
> +	/*
> +	 * If we have a symbol_name argument look it up,
> +	 * and add it to the address.  That way the addr
> +	 * field can either be global or relative to a symbol.
> +	 */
> +	if (p->symbol_name) {
> +		if (p->addr)
> +			return -EINVAL;
> +		p->addr = kprobe_lookup_name(p->symbol_name) + p->offset;
> +	}

What if kprobe_lookup_name() fails or if CONFIG_KALLSYMS isn't set?  The
code following this might work, but the kprobe isn't going to be set at
the location that was intended.

Perhaps this needs something like:

	if (p->symbol_name) {
		if (p->addr)
			return -EINVAL;
		p->addr = kprobe_lookup_name(p->symbol_name) + p->offset;
		if (p->addr == p->offset)
			return -EINVAL;
	}

-- 
David Smith
dsmith@...hat.com
Red Hat, Inc.
http://www.redhat.com
256.217.0141 (direct)
256.837.0057 (fax)


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