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authorEric W. Biederman <ebiederm@xmission.com>2012-05-25 15:50:59 -0600
committerEric W. Biederman <ebiederm@xmission.com>2012-08-14 21:55:29 -0700
commit8c6e2a941ae74d850a7bf0e5b3f4cd567e0f27dc (patch)
tree4233dd4dbac8f2631ab792d521deb68ae3027c52
parenta6c6796c7127de55cfa9bb0cfbb082ec0acd4eab (diff)
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userns: Convert xt_LOG to print socket kuids and kgids as uids and gids
xt_LOG always writes messages via sb_add via printk. Therefore when xt_LOG logs the uid and gid of a socket a packet came from the values should be converted to be in the initial user namespace. Thus making xt_LOG as user namespace safe as possible. Cc: Pablo Neira Ayuso <pablo@netfilter.org> Cc: Patrick McHardy <kaber@trash.net> Acked-by: David S. Miller <davem@davemloft.net> Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
-rw-r--r--init/Kconfig1
-rw-r--r--net/netfilter/xt_LOG.c16
2 files changed, 10 insertions, 7 deletions
diff --git a/init/Kconfig b/init/Kconfig
index b44c3a3..c8911eb 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -945,7 +945,6 @@ config UIDGID_CONVERTED
depends on NET_9P = n
depends on NETFILTER_XT_MATCH_OWNER = n
depends on NETFILTER_XT_MATCH_RECENT = n
- depends on NETFILTER_XT_TARGET_LOG = n
depends on AF_RXRPC = n
depends on NET_KEY = n
depends on DNS_RESOLVER = n
diff --git a/net/netfilter/xt_LOG.c b/net/netfilter/xt_LOG.c
index ff5f75f..02a2bf4 100644
--- a/net/netfilter/xt_LOG.c
+++ b/net/netfilter/xt_LOG.c
@@ -363,10 +363,12 @@ static void dump_ipv4_packet(struct sbuff *m,
/* Max length: 15 "UID=4294967295 " */
if ((logflags & XT_LOG_UID) && !iphoff && skb->sk) {
read_lock_bh(&skb->sk->sk_callback_lock);
- if (skb->sk->sk_socket && skb->sk->sk_socket->file)
+ if (skb->sk->sk_socket && skb->sk->sk_socket->file) {
+ const struct cred *cred = skb->sk->sk_socket->file->f_cred;
sb_add(m, "UID=%u GID=%u ",
- skb->sk->sk_socket->file->f_cred->fsuid,
- skb->sk->sk_socket->file->f_cred->fsgid);
+ from_kuid_munged(&init_user_ns, cred->fsuid),
+ from_kgid_munged(&init_user_ns, cred->fsgid));
+ }
read_unlock_bh(&skb->sk->sk_callback_lock);
}
@@ -719,10 +721,12 @@ static void dump_ipv6_packet(struct sbuff *m,
/* Max length: 15 "UID=4294967295 " */
if ((logflags & XT_LOG_UID) && recurse && skb->sk) {
read_lock_bh(&skb->sk->sk_callback_lock);
- if (skb->sk->sk_socket && skb->sk->sk_socket->file)
+ if (skb->sk->sk_socket && skb->sk->sk_socket->file) {
+ const struct cred *cred = skb->sk->sk_socket->file->f_cred;
sb_add(m, "UID=%u GID=%u ",
- skb->sk->sk_socket->file->f_cred->fsuid,
- skb->sk->sk_socket->file->f_cred->fsgid);
+ from_kuid_munged(&init_user_ns, cred->fsuid),
+ from_kgid_munged(&init_user_ns, cred->fsgid));
+ }
read_unlock_bh(&skb->sk->sk_callback_lock);
}
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