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Commit 6f285b19 authored by Eric W. Biederman's avatar Eric W. Biederman
Browse files

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: default avatar"Eric W. Biederman" <ebiederm@xmission.com>
parent 48095d99

include/linux/audit.h

+2 −1
Original line number Diff line number Diff line
@@ -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 */

kernel/audit.c

+10 −11
Original line number Diff line number Diff line
@@ -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: {

kernel/auditfilter.c

+5 −2
Original line number Diff line number Diff line
@@ -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);