linux-kernel - Re: [RESEND][PATCH] scsi: esas2r: fix potential format string flaw

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Date:	Tue, 17 Dec 2013 21:42:50 -0800
From:	Joe Perches <joe@...ches.com>
To:	Kees Cook <keescook@...omium.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org,
	Bradley Grove <linuxdrivers@...otech.com>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	linux-scsi@...r.kernel.org
Subject: Re: [RESEND][PATCH] scsi: esas2r: fix potential format string flaw

On Tue, 2013-12-17 at 10:27 -0800, Kees Cook wrote:
> This makes sure format strings cannot leak into the printk call via the
> constructed buffer.
[]
> diff --git a/drivers/scsi/esas2r/esas2r_log.c b/drivers/scsi/esas2r/esas2r_log.c
[]
> @@ -171,7 +171,7 @@ static int esas2r_log_master(const long level,
>  		if (strlen(event_buffer) < buflen)
>  			strcat(buffer, "\n");
>  
> -		printk(event_buffer);
> +		printk("%s", event_buffer);

It's probably better to remove the

		if (strlen(event_buffer) < buflen)
			strcat(buffer, "\n");

and use

	printk("%s\n", event_buffer);

so that the output is always newline terminated.


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