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Message-Id: <1344889115-21610-17-git-send-email-ebiederm@xmission.com> Date: Mon, 13 Aug 2012 13:18:31 -0700 From: "Eric W. Biederman" <ebiederm@...ssion.com> To: <netdev@...r.kernel.org> Cc: <linux-kernel@...r.kernel.org>, <containers@...ts.linux-foundation.org>, David Miller <davem@...emloft.net>, Serge Hallyn <serge@...lyn.com>, "Eric W. Biederman" <ebiederm@...ssion.com>, Pablo Neira Ayuso <pablo@...filter.org>, Patrick McHardy <kaber@...sh.net> Subject: [PATCH 17/21] userns: Convert xt_LOG to print socket kuids and kgids as uids and gids From: "Eric W. Biederman" <ebiederm@...ssion.com> 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@...filter.org> Cc: Patrick McHardy <kaber@...sh.net> Acked-by: Serge Hallyn <serge.hallyn@...onical.com> Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com> --- init/Kconfig | 1 - net/netfilter/xt_LOG.c | 16 ++++++++++------ 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); } -- 1.7.5.4 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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