From: David Miller <davem@davemloft.net>
To: segoon@openwall.com
Cc: kernel-janitors@vger.kernel.org, kuznet@ms2.inr.ac.ru,
pekkas@netcore.fi, jmorris@namei.org, yoshfuji@linux-ipv6.org,
kaber@trash.net, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] net: ipv4: tcp_probe: cleanup snprintf() use
Date: Wed, 17 Nov 2010 12:30:21 -0800 (PST) [thread overview]
Message-ID: <20101117.123021.241451290.davem@davemloft.net> (raw)
In-Reply-To: <1289754368-31660-1-git-send-email-segoon@openwall.com>
From: Vasiliy Kulikov <segoon@openwall.com>
Date: Sun, 14 Nov 2010 20:06:08 +0300
> snprintf() returns number of bytes that were copied if there is no overflow.
> This code uses return value as number of copied bytes. Theoretically format
> string '%lu.%09lu %pI4:%u %pI4:%u %d %#x %#x %u %u %u %u\n' may be expanded
> up to 163 bytes. In reality tv.tv_sec is just few bytes instead of 20, 2 ports
> are just 5 bytes each instead of 10, length is 5 bytes instead of 10. The rest
> is an unstrusted input. Theoretically if tv_sec is big then copy_to_user() would
> overflow tbuf.
>
> tbuf was increased to fit in 163 bytes. snprintf() is used to follow return
> value semantic.
>
> Signed-off-by: Vasiliy Kulikov <segoon@openwall.com>
Applied, thanks.
prev parent reply other threads:[~2010-11-17 20:30 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-14 17:06 [PATCH] net: ipv4: tcp_probe: cleanup snprintf() use Vasiliy Kulikov
2010-11-17 20:30 ` David Miller [this message]
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