linux-kernel - Re: [PATCH v2] drivers/base: Fix length checks in create_syslog_header()/dev_vprintk

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Message-ID: <20140709235736.GA31914@kroah.com>
Date:	Wed, 9 Jul 2014 16:57:36 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	LKML <linux-kernel@...r.kernel.org>, Joe Perches <joe@...ches.com>,
	Kay Sievers <kay@...y.org>
Subject: Re: [PATCH v2] drivers/base: Fix length checks in
 create_syslog_header()/dev_vprintk_emit()

On Sun, Jun 08, 2014 at 11:51:43PM +0100, Ben Hutchings wrote:
> snprintf() returns the number of bytes that could have been written
> (excluding the null), not the actual number of bytes written.  Given a
> long enough subsystem or device name, these functions will advance
> beyond the end of the on-stack buffer in dev_vprintk_exit(), resulting
> in an information leak or stack corruption.  I don't know whether such
> a long name is currently possible.
> 
> In case snprintf() returns a value >= the buffer size, do not add
> structured logging information.  Also WARN if this happens, so we can
> fix the driver or increase the buffer size.
> 
> Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
> ---
> v2: use dev_WARN() not dev_WARN_ON()

This patch breaks the build in a huge way:

drivers/base/core.c: In function ‘create_syslog_header’:
drivers/base/core.c:2049:16: error: expected ‘)’ before numeric constant
  dev_WARN(dev, 1, "device/subsystem name too long");
                  ^

is the start of it, it goes on for a page or so after that :(

greg k-h
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