linux-kernel - [04/25] netlink: validate NLA

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Message-Id: <20111123002207.381859654@clark.kroah.org>
Date:	Tue, 22 Nov 2011 16:20:54 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Thomas Graf <tgraf@...g.ch>,
	Johannes Berg <johannes.berg@...el.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [04/25] netlink: validate NLA_MSECS length

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------
Content-Length: 1138
Lines: 39

From: Johannes Berg <johannes.berg@...el.com>

commit c30bc94758ae2a38a5eb31767c1985c0aae0950b upstream.

L2TP for example uses NLA_MSECS like this:
policy:
        [L2TP_ATTR_RECV_TIMEOUT]        = { .type = NLA_MSECS, },
code:
        if (info->attrs[L2TP_ATTR_RECV_TIMEOUT])
                cfg.reorder_timeout = nla_get_msecs(info->attrs[L2TP_ATTR_RECV_TIMEOUT]);

As nla_get_msecs() is essentially nla_get_u64() plus the
conversion to a HZ-based value, this will not properly
reject attributes from userspace that aren't long enough
and might overrun the message.

Add NLA_MSECS to the attribute minlen array to check the
size properly.

Cc: Thomas Graf <tgraf@...g.ch>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 lib/nlattr.c |    1 +
 1 file changed, 1 insertion(+)

--- a/lib/nlattr.c
+++ b/lib/nlattr.c
@@ -20,6 +20,7 @@ static u16 nla_attr_minlen[NLA_TYPE_MAX+
 	[NLA_U16]	= sizeof(u16),
 	[NLA_U32]	= sizeof(u32),
 	[NLA_U64]	= sizeof(u64),
+	[NLA_MSECS]	= sizeof(u64),
 	[NLA_NESTED]	= NLA_HDRLEN,
 };
 


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