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Fwd: Re: cve request: bat_socket_read memory corruption
From: Kurt Seifried <kseifried () redhat com>
Date: Sun, 11 Dec 2011 18:35:35 -0700

Please USE CVE-2011-4604 for this issue.

-------- Original Message --------
Subject:        Re: [oss-security] cve request: bat_socket_read memory corruption
Date:   Sat, 10 Dec 2011 20:35:33 +0100
From:   Paul <pawlkt () gmail com>
To:     kseifried () redhat com

On 2011-12-10 20:30, Kurt Seifried wrote:
On 12/10/2011 09:13 AM, Paul wrote:

can I get a CVE for this:

If root does read() on a specific socket, it's possible to corrupt
(kernel) memory over network, with an ICMP packet, if B.A.T.M.A.N. mesh
protocol is used.

I'm going to need first hand source information, i.e. links to the
code/commits/project stating it's an issue or something similar.


Modified patch from Sven Eckelmann, one of project's managers.



Don't write more than the requested number of bytes of an batman-adv icmp
packet to the userspace buffer. Otherwise unrelated userspace memory might get
overwritten by the kernel.

Reported-by: Paul Kot <pawlkt at gmail.com <https://lists.open-mesh.org/mm/listinfo/b.a.t.m.a.n>>
Signed-off-by: Sven Eckelmann <sven at narfation.org <https://lists.open-mesh.org/mm/listinfo/b.a.t.m.a.n>>
Marek pointed out that it is better to merge patch 1 and 2. I think it doesn't
make sense to leave Paul Kot as author because it doesn't look like his patch
at all.

And thanks to Andrew for s/overridden/overwritten/

 icmp_socket.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/icmp_socket.c b/icmp_socket.c
index 5bc8649..66923d2 100644
--- a/icmp_socket.c
+++ b/icmp_socket.c
@@ -136,10 +136,9 @@ static ssize_t bat_socket_read(struct file *file, char __user *buf,
-       error = __copy_to_user(buf, &socket_packet->icmp_packet,
-                              socket_packet->icmp_len);
+       packet_len = min(count, socket_packet->icmp_len);
+       error = copy_to_user(buf, &socket_packet->icmp_packet, packet_len);
-       packet_len = socket_packet->icmp_len;
        if (error)

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