4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Lorenzo Colitti lorenzo@google.com
[ Upstream commit be8f8284cd897af2482d4e54fbc2bdfc15557259 ]
Currently it is possible to add or update socket policies, but not clear them. Therefore, once a socket policy has been applied, the socket cannot be used for unencrypted traffic.
This patch allows (privileged) users to clear socket policies by passing in a NULL pointer and zero length argument to the {IP,IPV6}_{IPSEC,XFRM}_POLICY setsockopts. This results in both the incoming and outgoing policies being cleared.
The simple approach taken in this patch cannot clear socket policies in only one direction. If desired this could be added in the future, for example by continuing to pass in a length of zero (which currently is guaranteed to return EMSGSIZE) and making the policy be a pointer to an integer that contains one of the XFRM_POLICY_{IN,OUT} enum values.
An alternative would have been to interpret the length as a signed integer and use XFRM_POLICY_IN (i.e., 0) to clear the input policy and -XFRM_POLICY_OUT (i.e., -1) to clear the output policy.
Tested: https://android-review.googlesource.com/539816 Signed-off-by: Lorenzo Colitti lorenzo@google.com Signed-off-by: Steffen Klassert steffen.klassert@secunet.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/xfrm/xfrm_policy.c | 2 +- net/xfrm/xfrm_state.c | 7 +++++++ 2 files changed, 8 insertions(+), 1 deletion(-)
--- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -1346,7 +1346,7 @@ EXPORT_SYMBOL(xfrm_policy_delete);
int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol) { - struct net *net = xp_net(pol); + struct net *net = sock_net(sk); struct xfrm_policy *old_pol;
#ifdef CONFIG_XFRM_SUB_POLICY --- a/net/xfrm/xfrm_state.c +++ b/net/xfrm/xfrm_state.c @@ -1883,6 +1883,13 @@ int xfrm_user_policy(struct sock *sk, in struct xfrm_mgr *km; struct xfrm_policy *pol = NULL;
+ if (!optval && !optlen) { + xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL); + xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL); + __sk_dst_reset(sk); + return 0; + } + if (optlen <= 0 || optlen > PAGE_SIZE) return -EMSGSIZE;