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

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]

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

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html