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From: David Miller <davem@davemloft.net>
To: glider@google.com
Cc: dvyukov@google.com, kcc@google.com, edumazet@google.com,
	stephen@networkplumber.org, linux-kernel@vger.kernel.org,
	netdev@vger.kernel.org
Subject: Re: [PATCH v4] net: don't call strlen on non-terminated string in dev_set_alias()
Date: Tue, 06 Jun 2017 16:36:39 -0400 (EDT)	[thread overview]
Message-ID: <20170606.163639.1246601020260541080.davem@davemloft.net> (raw)
In-Reply-To: <20170606135654.111884-1-glider@google.com>

From: Alexander Potapenko <glider@google.com>
Date: Tue,  6 Jun 2017 15:56:54 +0200

> KMSAN reported a use of uninitialized memory in dev_set_alias(),
> which was caused by calling strlcpy() (which in turn called strlen())
> on the user-supplied non-terminated string.
> 
> Signed-off-by: Alexander Potapenko <glider@google.com>

We should not be allowing non-NULL terminated strings for the
IFLA_IFALIAS attribute.  It's defined as type NLA_STRING in
the ifla_policy[] array.

Please figure out why we aren't enforcing the attribute policy
properly, rather than adding a workaround.

Thanks.

  reply	other threads:[~2017-06-06 20:36 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-06 13:56 [PATCH v4] net: don't call strlen on non-terminated string in dev_set_alias() Alexander Potapenko
2017-06-06 20:36 ` David Miller [this message]
2017-06-06 21:15   ` Alexander Potapenko
2017-06-06 21:57   ` Florian Westphal
2017-06-07  1:04     ` David Miller

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