linux-kernel - Re: [PATCH] Fix kobject uevent string handling errors

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Message-ID: <20070825044944.GA13282@kroah.com>
Date:	Fri, 24 Aug 2007 21:49:44 -0700
From:	Greg KH <greg@...ah.com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Kay Sievers <kay.sievers@...y.org>
Subject: Re: [PATCH] Fix kobject uevent string handling errors

On Sat, Aug 25, 2007 at 12:17:54AM -0400, Mathieu Desnoyers wrote:
> Fix kobject uevent string handling errors
> 
> - increment env->buflen in dmi-id.c
> - fix off-by-one in add_uevent_var in error checking of vsnprintf
> - add warnings when add_uevent_var. Proper handling of its return values should
>   really be done by the callers, but they aren't, so things currently
>   fail silently. This is why I add warnings.

Ah, thanks, but Kay just sent me an updated version with portions of
this fix in it already.

Thanks a lot for helping us track this all down, hopefully the scsi
layer isn't still overflowing the buffer :(

> -	if (env->envp_idx >= ARRAY_SIZE(env->envp))
> +	if (env->envp_idx >= ARRAY_SIZE(env->envp)) {
> +		printk("add_uevent_var: too small array size %u %u\n",
> +			env->envp_idx, ARRAY_SIZE(env->envp));
> +		WARN_ON(1);

printk's always need a KERN_level.

thanks,

greg k-h
-
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