From: Huw Davies <huw-PJ7GQ4yptbsswetKESUqMA@public.gmane.org>
To: netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-security-module-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
selinux-+05T5uksL2qpZYMLLGbcSA@public.gmane.org
Subject: [RFC PATCH 11/17] netlabel: Prevent setsockopt() from changing the hop-by-hop option.
Date: Tue, 22 Dec 2015 11:46:47 +0000 [thread overview]
Message-ID: <1450784813-18304-12-git-send-email-huw@codeweavers.com> (raw)
If a socket has a netlabel in place then don't let setsockopt() alter
the socket's IPv6 hop-by-hop option. This is in the same spirit as
the existing check for IPv4.
Signed-off-by: Huw Davies <huw-PJ7GQ4yptbsswetKESUqMA@public.gmane.org>
---
security/selinux/netlabel.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/security/selinux/netlabel.c b/security/selinux/netlabel.c
index 5470f32..2477a75 100644
--- a/security/selinux/netlabel.c
+++ b/security/selinux/netlabel.c
@@ -410,6 +410,21 @@ int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
}
/**
+ * selinux_netlbl_option - Is this a NetLabel option
+ * @level: the socket level or protocol
+ * @optname: the socket option name
+ *
+ * Description:
+ * Returns true if @level and @optname refer to a NetLabel option.
+ * Helper for selinux_netlbl_socket_setsockopt().
+ */
+static inline int selinux_netlbl_option(int level, int optname)
+{
+ return (level == IPPROTO_IP && optname == IP_OPTIONS) ||
+ (level == IPPROTO_IPV6 && optname == IPV6_HOPOPTS);
+}
+
+/**
* selinux_netlbl_socket_setsockopt - Do not allow users to remove a NetLabel
* @sock: the socket
* @level: the socket level or protocol
@@ -431,7 +446,7 @@ int selinux_netlbl_socket_setsockopt(struct socket *sock,
struct sk_security_struct *sksec = sk->sk_security;
struct netlbl_lsm_secattr secattr;
- if (level == IPPROTO_IP && optname == IP_OPTIONS &&
+ if (selinux_netlbl_option(level, optname) &&
(sksec->nlbl_state == NLBL_LABELED ||
sksec->nlbl_state == NLBL_CONNLABELED)) {
netlbl_secattr_init(&secattr);
--
1.8.0
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reply other threads:[~2015-12-22 11:46 UTC|newest]
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