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Message-ID: <874n3ir0uw.fsf_-_@xmission.com>
Date: Fri, 28 Feb 2014 20:36:55 -0800
From: ebiederm@...ssion.com (Eric W. Biederman)
To: Richard Guy Briggs <rgb@...hat.com>
Cc: Eric Paris <eparis@...hat.com>, linux-audit@...hat.com,
linux-kernel@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] audit: Send replies in the proper network namespace.
In perverse cases of file descriptor passing the current network
namespace of a process and the network namespace of a socket used by
that socket may differ. Therefore use the network namespace of the
appropiate socket to ensure replies always go to the appropiate
socket.
Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
This is an incremental change on top of my previous patch to guarantee
that replies always happen in the appropriate network namespace.
include/linux/audit.h | 3 ++-
kernel/audit.c | 21 ++++++++++-----------
kernel/auditfilter.c | 7 +++++--
3 files changed, 17 insertions(+), 14 deletions(-)
diff --git a/include/linux/audit.h b/include/linux/audit.h
index aa865a9a4c4f..ec1464df4c60 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -43,6 +43,7 @@ struct mq_attr;
struct mqstat;
struct audit_watch;
struct audit_tree;
+struct sk_buff;
struct audit_krule {
int vers_ops;
@@ -463,7 +464,7 @@ extern int audit_filter_user(int type);
extern int audit_filter_type(int type);
extern int audit_rule_change(int type, __u32 portid, int seq,
void *data, size_t datasz);
-extern int audit_list_rules_send(__u32 portid, int seq);
+extern int audit_list_rules_send(struct sk_buff *request_skb, int seq);
extern u32 audit_enabled;
#else /* CONFIG_AUDIT */
diff --git a/kernel/audit.c b/kernel/audit.c
index 1e5756f16f6f..32086bff5564 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -570,9 +570,11 @@ static int audit_send_reply_thread(void *arg)
* Allocates an skb, builds the netlink message, and sends it to the port id.
* No failure notifications.
*/
-static void audit_send_reply(__u32 portid, int seq, int type, int done,
+static void audit_send_reply(struct sk_buff *request_skb, int seq, int type, int done,
int multi, const void *payload, int size)
{
+ u32 portid = NETLINK_CB(request_skb).portid;
+ struct net *net = sock_net(NETLINK_CB(request_skb).sk);
struct sk_buff *skb;
struct task_struct *tsk;
struct audit_reply *reply = kmalloc(sizeof(struct audit_reply),
@@ -585,7 +587,7 @@ static void audit_send_reply(__u32 portid, int seq, int type, int done,
if (!skb)
goto out;
- reply->net = get_net(current->nsproxy->net_ns);
+ reply->net = get_net(net);
reply->portid = portid;
reply->skb = skb;
@@ -675,8 +677,7 @@ static int audit_get_feature(struct sk_buff *skb)
seq = nlmsg_hdr(skb)->nlmsg_seq;
- audit_send_reply(NETLINK_CB(skb).portid, seq, AUDIT_GET, 0, 0,
- &af, sizeof(af));
+ audit_send_reply(skb, seq, AUDIT_GET, 0, 0, &af, sizeof(af));
return 0;
}
@@ -796,8 +797,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
s.backlog = skb_queue_len(&audit_skb_queue);
s.version = AUDIT_VERSION_LATEST;
s.backlog_wait_time = audit_backlog_wait_time;
- audit_send_reply(NETLINK_CB(skb).portid, seq, AUDIT_GET, 0, 0,
- &s, sizeof(s));
+ audit_send_reply(skb, seq, AUDIT_GET, 0, 0, &s, sizeof(s));
break;
}
case AUDIT_SET: {
@@ -907,7 +907,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
seq, data, nlmsg_len(nlh));
break;
case AUDIT_LIST_RULES:
- err = audit_list_rules_send(NETLINK_CB(skb).portid, seq);
+ err = audit_list_rules_send(skb, seq);
break;
case AUDIT_TRIM:
audit_trim_trees();
@@ -972,8 +972,8 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
memcpy(sig_data->ctx, ctx, len);
security_release_secctx(ctx, len);
}
- audit_send_reply(NETLINK_CB(skb).portid, seq, AUDIT_SIGNAL_INFO,
- 0, 0, sig_data, sizeof(*sig_data) + len);
+ audit_send_reply(skb, seq, AUDIT_SIGNAL_INFO, 0, 0,
+ sig_data, sizeof(*sig_data) + len);
kfree(sig_data);
break;
case AUDIT_TTY_GET: {
@@ -985,8 +985,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
s.log_passwd = tsk->signal->audit_tty_log_passwd;
spin_unlock(&tsk->sighand->siglock);
- audit_send_reply(NETLINK_CB(skb).portid, seq,
- AUDIT_TTY_GET, 0, 0, &s, sizeof(s));
+ audit_send_reply(skb, seq, AUDIT_TTY_GET, 0, 0, &s, sizeof(s));
break;
}
case AUDIT_TTY_SET: {
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index a5e3d73d73e4..e8d1c7c515d7 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -30,6 +30,7 @@
#include <linux/slab.h>
#include <linux/security.h>
#include <net/net_namespace.h>
+#include <net/sock.h>
#include "audit.h"
/*
@@ -1069,8 +1070,10 @@ int audit_rule_change(int type, __u32 portid, int seq, void *data,
* @portid: target portid for netlink audit messages
* @seq: netlink audit message sequence (serial) number
*/
-int audit_list_rules_send(__u32 portid, int seq)
+int audit_list_rules_send(struct sk_buff *request_skb, int seq)
{
+ u32 portid = NETLINK_CB(request_skb).portid;
+ struct net *net = sock_net(NETLINK_CB(request_skb).sk);
struct task_struct *tsk;
struct audit_netlink_list *dest;
int err = 0;
@@ -1084,7 +1087,7 @@ int audit_list_rules_send(__u32 portid, int seq)
dest = kmalloc(sizeof(struct audit_netlink_list), GFP_KERNEL);
if (!dest)
return -ENOMEM;
- dest->net = get_net(current->nsproxy->net_ns);
+ dest->net = get_net(net);
dest->portid = portid;
skb_queue_head_init(&dest->q);
--
1.7.5.4
--
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