* [PATCH net] packet: fix heap info leak in PACKET_DIAG_MCLIST sock_diag interface
@ 2016-04-10 10:52 Mathias Krause
2016-04-11 8:58 ` Pavel Emelyanov
2016-04-14 4:47 ` David Miller
0 siblings, 2 replies; 3+ messages in thread
From: Mathias Krause @ 2016-04-10 10:52 UTC (permalink / raw)
To: David S. Miller; +Cc: netdev, Eric W. Biederman, Pavel Emelyanov
Because we miss to wipe the remainder of i->addr[] in packet_mc_add(),
pdiag_put_mclist() leaks uninitialized heap bytes via the
PACKET_DIAG_MCLIST netlink attribute.
Fix this by explicitly memset(0)ing the remaining bytes in i->addr[].
Fixes: eea68e2f1a00 ("packet: Report socket mclist info via diag module")
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
---
The bug itself precedes commit eea68e2f1a00 but the list wasn't exposed
to userland before the introduction of the packet_diag interface.
Therefore the "Fixes:" line on that commit.
net/packet/af_packet.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 992396aa635c..86a408cf38d5 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -3441,6 +3441,7 @@ static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
i->ifindex = mreq->mr_ifindex;
i->alen = mreq->mr_alen;
memcpy(i->addr, mreq->mr_address, i->alen);
+ memset(i->addr + i->alen, 0, sizeof(i->addr) - i->alen);
i->count = 1;
i->next = po->mclist;
po->mclist = i;
--
1.7.10.4
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH net] packet: fix heap info leak in PACKET_DIAG_MCLIST sock_diag interface
2016-04-10 10:52 [PATCH net] packet: fix heap info leak in PACKET_DIAG_MCLIST sock_diag interface Mathias Krause
@ 2016-04-11 8:58 ` Pavel Emelyanov
2016-04-14 4:47 ` David Miller
1 sibling, 0 replies; 3+ messages in thread
From: Pavel Emelyanov @ 2016-04-11 8:58 UTC (permalink / raw)
To: Mathias Krause, David S. Miller; +Cc: netdev, Eric W. Biederman
On 04/10/2016 01:52 PM, Mathias Krause wrote:
> Because we miss to wipe the remainder of i->addr[] in packet_mc_add(),
> pdiag_put_mclist() leaks uninitialized heap bytes via the
> PACKET_DIAG_MCLIST netlink attribute.
>
> Fix this by explicitly memset(0)ing the remaining bytes in i->addr[].
>
> Fixes: eea68e2f1a00 ("packet: Report socket mclist info via diag module")
> Signed-off-by: Mathias Krause <minipli@googlemail.com>
> Cc: Eric W. Biederman <ebiederm@xmission.com>
> Cc: Pavel Emelyanov <xemul@parallels.com>
Acked-by: Pavel Emelyanov <xemul@virtuozzo.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH net] packet: fix heap info leak in PACKET_DIAG_MCLIST sock_diag interface
2016-04-10 10:52 [PATCH net] packet: fix heap info leak in PACKET_DIAG_MCLIST sock_diag interface Mathias Krause
2016-04-11 8:58 ` Pavel Emelyanov
@ 2016-04-14 4:47 ` David Miller
1 sibling, 0 replies; 3+ messages in thread
From: David Miller @ 2016-04-14 4:47 UTC (permalink / raw)
To: minipli; +Cc: netdev, ebiederm, xemul
From: Mathias Krause <minipli@googlemail.com>
Date: Sun, 10 Apr 2016 12:52:28 +0200
> Because we miss to wipe the remainder of i->addr[] in packet_mc_add(),
> pdiag_put_mclist() leaks uninitialized heap bytes via the
> PACKET_DIAG_MCLIST netlink attribute.
>
> Fix this by explicitly memset(0)ing the remaining bytes in i->addr[].
>
> Fixes: eea68e2f1a00 ("packet: Report socket mclist info via diag module")
> Signed-off-by: Mathias Krause <minipli@googlemail.com>
Applied and queued up for -stable, thanks.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2016-04-10 10:52 [PATCH net] packet: fix heap info leak in PACKET_DIAG_MCLIST sock_diag interface Mathias Krause
2016-04-11 8:58 ` Pavel Emelyanov
2016-04-14 4:47 ` David Miller
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