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authorGhantaKrishnamurthy MohanKrishna <mohan.krishna.ghanta.krishnamurthy@ericsson.com>2018-04-04 14:49:47 +0200
committerDavid S. Miller <davem@davemloft.net>2018-04-04 11:54:35 -0400
commit4b2e6877b8793b60abb75c15abaaa4377807a358 (patch)
treefd1b4ff1a0f5717a7b521812e871ed4537b157de /net/tipc
parent9e8445a56c253f01f6716ac14526a7dae6bc0d46 (diff)
downloadlinux-4b2e6877b8793b60abb75c15abaaa4377807a358.tar.bz2
tipc: Fix namespace violation in tipc_sk_fill_sock_diag
To fetch UID info for socket diagnostics, we determine the namespace of user context using tipc socket instance. This may cause namespace violation, as the kernel will remap based on UID. We fix this by fetching namespace info using the calling userspace netlink socket. Fixes: c30b70deb5f4 (tipc: implement socket diagnostics for AF_TIPC) Reported-by: syzbot+326e587eff1074657718@syzkaller.appspotmail.com Acked-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: GhantaKrishnamurthy MohanKrishna <mohan.krishna.ghanta.krishnamurthy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tipc')
-rw-r--r--net/tipc/socket.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 3e5eba30865e..cee6674a3bf4 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -3280,7 +3280,8 @@ int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct tipc_sock *tsk,
nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) ||
nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) ||
nla_put_u32(skb, TIPC_NLA_SOCK_UID,
- from_kuid_munged(sk_user_ns(sk), sock_i_uid(sk))) ||
+ from_kuid_munged(sk_user_ns(NETLINK_CB(skb).sk),
+ sock_i_uid(sk))) ||
nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE,
tipc_diag_gen_cookie(sk),
TIPC_NLA_SOCK_PAD))