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| author | Huw Davies <huw@codeweavers.com> | 2016-06-27 15:05:27 -0400 |
|---|---|---|
| committer | Paul Moore <paul@paul-moore.com> | 2016-06-27 15:05:27 -0400 |
| commit | 1f440c99d3207d684a3ac48d6e528af548b5c915 (patch) | |
| tree | 9cbeedd54d1e5363d1ae012ce75e5bbb1fe0ffb3 /security | |
| parent | ceba1832b1b2da0149c51de62a847c00bca1677a (diff) | |
| download | linux-exynos-1f440c99d3207d684a3ac48d6e528af548b5c915.tar.gz linux-exynos-1f440c99d3207d684a3ac48d6e528af548b5c915.tar.bz2 linux-exynos-1f440c99d3207d684a3ac48d6e528af548b5c915.zip | |
netlabel: Prevent setsockopt() from changing the hop-by-hop option.
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@codeweavers.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'security')
| -rw-r--r-- | security/selinux/netlabel.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/security/selinux/netlabel.c b/security/selinux/netlabel.c index 5470f32eca54..2477a75f16e7 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); |