Date: Sun, 11 Dec 2011 18:35:35 -0700 From: Kurt Seifried <kseifried@...hat.com> To: oss-security@...ts.openwall.com Subject: Fwd: Re: cve request: bat_socket_read memory corruption 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@...il.com> To: kseifried@...hat.com On 2011-12-10 20:30, Kurt Seifried wrote: > On 12/10/2011 09:13 AM, Paul wrote: >> Hi >> >> can I get a CVE for this: >> https://lists.open-mesh.org/pipermail/b.a.t.m.a.n/2011-December/005904.html >> ? >> >> 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. > https://lists.open-mesh.org/pipermail/b.a.t.m.a.n/2011-December/005908.html Modified patch from Sven Eckelmann, one of project's managers. -- Regards, Paul =========================== 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, spin_unlock_bh(&socket_client->lock); - 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; kfree(socket_packet); if (error) -- 188.8.131.52
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