lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20140506133326.GU26890@mwanda>
Date:	Tue, 6 May 2014 16:33:26 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Martin Kepplinger <martink@...teo.de>
Cc:	gregkh@...uxfoundation.org, devel@...verdev.osuosl.org,
	lidza.louina@...il.com, driverdev-devel@...uxdriverproject.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: dgnc: fix compile warning frame size is larger
 than 1024 bytes

On Tue, May 06, 2014 at 02:41:37PM +0200, Martin Kepplinger wrote:
> fix following warning by dynamically allocating memory:
> dgnc_tty.c:583:1: warning: the frame size of 1060 bytes is larger than 1024 bytes [-Wframe-larger-than=]
> 
> Signed-off-by: Martin Kepplinger <martink@...teo.de>
> ---
> This is more of a question. Is this a desired solution to fixing such a
> frame size warning?

This warning is because the kernel uses an 8k stack so you add up all
the stack memory used by each function from the syscall to here.  If
it adds up to more than 8k then it's a bug.  The 1k limit per function
is just a hack to spot where people are maybe being reckless.

There are no kfree()s and this function is called with a spin_lock held
so this patch introduces a couple bugs.

There may be a better way to allocate this.  Like maybe at probe() and
then use spinlocks to serialize access to the buffer.  But sometimes
that's a very bad idea.

It's better if you know the driver a bit and can test things.

regards,
dan carpenter

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ