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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@xmission.com>
Acked-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Eric W. Biederman 2014-02-28 20:36:55 -08:00 committed by Eric Paris
parent 638a0fd2a0
commit 099dd23511
3 changed files with 17 additions and 14 deletions
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3
include/linux/audit.h
View File

@ -43,6 +43,7 @@ struct mq_attr;
struct mqstat; struct mqstat;
struct audit_watch; struct audit_watch;
struct audit_tree; struct audit_tree;
struct sk_buff;
struct audit_krule { struct audit_krule {
int vers_ops; int vers_ops;
@ -463,7 +464,7 @@ extern int audit_filter_user(int type);
extern int audit_filter_type(int type); extern int audit_filter_type(int type);
extern int audit_rule_change(int type, __u32 portid, int seq, extern int audit_rule_change(int type, __u32 portid, int seq,
void *data, size_t datasz); 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; extern u32 audit_enabled;
#else /* CONFIG_AUDIT */ #else /* CONFIG_AUDIT */

21
kernel/audit.c
View File

@ -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. * Allocates an skb, builds the netlink message, and sends it to the port id.
* No failure notifications. * 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) 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 sk_buff *skb;
struct task_struct *tsk; struct task_struct *tsk;
struct audit_reply *reply = kmalloc(sizeof(struct audit_reply), 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) if (!skb)
goto out; goto out;
reply->net = get_net(current->nsproxy->net_ns); reply->net = get_net(net);
reply->portid = portid; reply->portid = portid;
reply->skb = skb; reply->skb = skb;
@ -675,8 +677,7 @@ static int audit_get_feature(struct sk_buff *skb)
seq = nlmsg_hdr(skb)->nlmsg_seq; seq = nlmsg_hdr(skb)->nlmsg_seq;
audit_send_reply(NETLINK_CB(skb).portid, seq, AUDIT_GET, 0, 0, audit_send_reply(skb, seq, AUDIT_GET, 0, 0, &af, sizeof(af));
&af, sizeof(af));
return 0; 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.backlog = skb_queue_len(&audit_skb_queue);
s.version = AUDIT_VERSION_LATEST; s.version = AUDIT_VERSION_LATEST;
s.backlog_wait_time = audit_backlog_wait_time; s.backlog_wait_time = audit_backlog_wait_time;
audit_send_reply(NETLINK_CB(skb).portid, seq, AUDIT_GET, 0, 0, audit_send_reply(skb, seq, AUDIT_GET, 0, 0, &s, sizeof(s));
&s, sizeof(s));
break; break;
} }
case AUDIT_SET: { case AUDIT_SET: {
@ -907,7 +907,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
seq, data, nlmsg_len(nlh)); seq, data, nlmsg_len(nlh));
break; break;
case AUDIT_LIST_RULES: case AUDIT_LIST_RULES:
err = audit_list_rules_send(NETLINK_CB(skb).portid, seq); err = audit_list_rules_send(skb, seq);
break; break;
case AUDIT_TRIM: case AUDIT_TRIM:
audit_trim_trees(); 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); memcpy(sig_data->ctx, ctx, len);
security_release_secctx(ctx, len); security_release_secctx(ctx, len);
} }
audit_send_reply(NETLINK_CB(skb).portid, seq, AUDIT_SIGNAL_INFO, audit_send_reply(skb, seq, AUDIT_SIGNAL_INFO, 0, 0,
0, 0, sig_data, sizeof(*sig_data) + len); sig_data, sizeof(*sig_data) + len);
kfree(sig_data); kfree(sig_data);
break; break;
case AUDIT_TTY_GET: { 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; s.log_passwd = tsk->signal->audit_tty_log_passwd;
spin_unlock(&tsk->sighand->siglock); spin_unlock(&tsk->sighand->siglock);
audit_send_reply(NETLINK_CB(skb).portid, seq, audit_send_reply(skb, seq, AUDIT_TTY_GET, 0, 0, &s, sizeof(s));
AUDIT_TTY_GET, 0, 0, &s, sizeof(s));
break; break;
} }
case AUDIT_TTY_SET: { case AUDIT_TTY_SET: {

7
kernel/auditfilter.c
View File

@ -32,6 +32,7 @@
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/security.h> #include <linux/security.h>
#include <net/net_namespace.h> #include <net/net_namespace.h>
#include <net/sock.h>
#include "audit.h" #include "audit.h"
/* /*
@ -1071,8 +1072,10 @@ int audit_rule_change(int type, __u32 portid, int seq, void *data,
* @portid: target portid for netlink audit messages * @portid: target portid for netlink audit messages
* @seq: netlink audit message sequence (serial) number * @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 task_struct *tsk;
struct audit_netlink_list *dest; struct audit_netlink_list *dest;
int err = 0; int err = 0;
@ -1086,7 +1089,7 @@ int audit_list_rules_send(__u32 portid, int seq)
dest = kmalloc(sizeof(struct audit_netlink_list), GFP_KERNEL); dest = kmalloc(sizeof(struct audit_netlink_list), GFP_KERNEL);
if (!dest) if (!dest)
return -ENOMEM; return -ENOMEM;
dest->net = get_net(current->nsproxy->net_ns); dest->net = get_net(net);
dest->portid = portid; dest->portid = portid;
skb_queue_head_init(&dest->q); skb_queue_head_init(&dest->q);