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proc connector: reject unprivileged listener bumps

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While PROC_CN_MCAST_LISTEN/IGNORE is entirely advisory, it was possible
for an unprivileged user to turn off notifications for all listeners by
sending PROC_CN_MCAST_IGNORE. Instead, require the same privileges as
required for a multicast bind.

Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Evgeniy Polyakov <zbr@ioremap.net>
Cc: Matt Helsley <matthltc@us.ibm.com>
Cc: stable@vger.kernel.org
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Acked-by: Matt Helsley <matthltc@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kees Cook 2013-02-25 21:32:25 +00:00 committed by David S. Miller
parent 114a6f8b52
commit e70ab97799
1 changed files with 8 additions and 0 deletions
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8
drivers/connector/cn_proc.c
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@ -313,6 +313,12 @@ static void cn_proc_mcast_ctl(struct cn_msg *msg,
(task_active_pid_ns(current) != &init_pid_ns)) (task_active_pid_ns(current) != &init_pid_ns))
return; return;
/* Can only change if privileged. */
if (!capable(CAP_NET_ADMIN)) {
err = EPERM;
goto out;
}
mc_op = (enum proc_cn_mcast_op *)msg->data; mc_op = (enum proc_cn_mcast_op *)msg->data;
switch (*mc_op) { switch (*mc_op) {
case PROC_CN_MCAST_LISTEN: case PROC_CN_MCAST_LISTEN:
@ -325,6 +331,8 @@ static void cn_proc_mcast_ctl(struct cn_msg *msg,
err = EINVAL; err = EINVAL;
break; break;
} }
out:
cn_proc_ack(err, msg->seq, msg->ack); cn_proc_ack(err, msg->seq, msg->ack);
} }