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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

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Pull audit namespace fixes from Eric Biederman:
 "Starting with 3.14-rc1 the audit code is faulty (think oopses and
  races) with respect to how it computes the network namespace of which
  socket to reply to, and I happened to notice by chance when reading
  through the code.

  My testing and the automated build bots don't find any problems with
  these fixes"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
  audit: Update kdoc for audit_send_reply and audit_list_rules_send
  audit: Send replies in the proper network namespace.
  audit: Use struct net not pid_t to remember the network namespce to reply in
This commit is contained in:
Linus Torvalds 2014-03-11 10:17:50 -07:00
commit adf961d7e8
4 changed files with 26 additions and 20 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 */

31
kernel/audit.c
View file

@ -182,7 +182,7 @@ struct audit_buffer {
struct audit_reply { struct audit_reply {
__u32 portid; __u32 portid;
pid_t pid; struct net *net;
struct sk_buff *skb; struct sk_buff *skb;
}; };
@ -500,7 +500,7 @@ int audit_send_list(void *_dest)
{ {
struct audit_netlink_list *dest = _dest; struct audit_netlink_list *dest = _dest;
struct sk_buff *skb; struct sk_buff *skb;
struct net *net = get_net_ns_by_pid(dest->pid); struct net *net = dest->net;
struct audit_net *aunet = net_generic(net, audit_net_id); struct audit_net *aunet = net_generic(net, audit_net_id);
/* wait for parent to finish and send an ACK */ /* wait for parent to finish and send an ACK */
@ -510,6 +510,7 @@ int audit_send_list(void *_dest)
while ((skb = __skb_dequeue(&dest->q)) != NULL) while ((skb = __skb_dequeue(&dest->q)) != NULL)
netlink_unicast(aunet->nlsk, skb, dest->portid, 0); netlink_unicast(aunet->nlsk, skb, dest->portid, 0);
put_net(net);
kfree(dest); kfree(dest);
return 0; return 0;
@ -543,7 +544,7 @@ out_kfree_skb:
static int audit_send_reply_thread(void *arg) static int audit_send_reply_thread(void *arg)
{ {
struct audit_reply *reply = (struct audit_reply *)arg; struct audit_reply *reply = (struct audit_reply *)arg;
struct net *net = get_net_ns_by_pid(reply->pid); struct net *net = reply->net;
struct audit_net *aunet = net_generic(net, audit_net_id); struct audit_net *aunet = net_generic(net, audit_net_id);
mutex_lock(&audit_cmd_mutex); mutex_lock(&audit_cmd_mutex);
@ -552,12 +553,13 @@ static int audit_send_reply_thread(void *arg)
/* Ignore failure. It'll only happen if the sender goes away, /* Ignore failure. It'll only happen if the sender goes away,
because our timeout is set to infinite. */ because our timeout is set to infinite. */
netlink_unicast(aunet->nlsk , reply->skb, reply->portid, 0); netlink_unicast(aunet->nlsk , reply->skb, reply->portid, 0);
put_net(net);
kfree(reply); kfree(reply);
return 0; return 0;
} }
/** /**
* audit_send_reply - send an audit reply message via netlink * audit_send_reply - send an audit reply message via netlink
* @portid: netlink port to which to send reply * @request_skb: skb of request we are replying to (used to target the reply)
* @seq: sequence number * @seq: sequence number
* @type: audit message type * @type: audit message type
* @done: done (last) flag * @done: done (last) flag
@ -568,9 +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),
@ -583,8 +587,8 @@ 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(net);
reply->portid = portid; reply->portid = portid;
reply->pid = task_pid_vnr(current);
reply->skb = skb; reply->skb = skb;
tsk = kthread_run(audit_send_reply_thread, reply, "audit_send_reply"); tsk = kthread_run(audit_send_reply_thread, reply, "audit_send_reply");
@ -673,8 +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;
} }
@ -794,8 +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: {
@ -905,7 +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();
@ -970,8 +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: {
@ -983,8 +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: {

2
kernel/audit.h
View file

@ -247,7 +247,7 @@ extern void audit_panic(const char *message);
struct audit_netlink_list { struct audit_netlink_list {
__u32 portid; __u32 portid;
pid_t pid; struct net *net;
struct sk_buff_head q; struct sk_buff_head q;
}; };

10
kernel/auditfilter.c
View file

@ -29,6 +29,8 @@
#include <linux/sched.h> #include <linux/sched.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/security.h> #include <linux/security.h>
#include <net/net_namespace.h>
#include <net/sock.h>
#include "audit.h" #include "audit.h"
/* /*
@ -1065,11 +1067,13 @@ int audit_rule_change(int type, __u32 portid, int seq, void *data,
/** /**
* audit_list_rules_send - list the audit rules * audit_list_rules_send - list the audit rules
* @portid: target portid for netlink audit messages * @request_skb: skb of request we are replying to (used to target the reply)
* @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;
@ -1083,8 +1087,8 @@ 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(net);
dest->portid = portid; dest->portid = portid;
dest->pid = task_pid_vnr(current);
skb_queue_head_init(&dest->q); skb_queue_head_init(&dest->q);
mutex_lock(&audit_filter_mutex); mutex_lock(&audit_filter_mutex);