linux-kernel - Re: [PATCH] SUNRPC: Prevent kernel stack corruption on long values of flush

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Message-ID: <20120718203304.GA18540@redhat.com>
Date:	Wed, 18 Jul 2012 16:33:04 -0400
From:	Dave Jones <davej@...hat.com>
To:	Jim Rees <rees@...ch.edu>
Cc:	"J. Bruce Fields" <bfields@...ldses.org>,
	Sasha Levin <levinsasha928@...il.com>,
	Trond.Myklebust@...app.com, davem@...emloft.net,
	linux-nfs@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] SUNRPC: Prevent kernel stack corruption on long values
 of flush

On Wed, Jul 18, 2012 at 04:00:49PM -0400, Jim Rees wrote:

 > You could use something like:
 > 
 >     char tbuf[sizeof (unsigned long) * 24 / 10 + 1 + 2]; /* + 2 for final "\n\0" */
 > 
 > since there are roughly 10 bits for every 3 decimal digits.
 > 
 > But I'm obviously confused, because I don't understand why tbuf needs to be
 > any more than 10 + 2.

Unsigned long isn't necessarily 32 bits.
On 64-bit systems %lu can be up to 18446744073709551615

	Dave

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