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Subject[PATCH RFC 04/48] Audit: make audit_skb_queue per user namespace
Date
After this patch, ervery user namespace has one
audit_skb_queue. Since we havn't finish the preparations,
only allow user to operate the skb queue of init user
namespace.

Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
---
include/linux/audit.h | 4 ++++
include/linux/user_namespace.h | 2 ++
kernel/audit.c | 35 ++++++++++++++++++++++++++---------
kernel/user_namespace.c | 1 +
4 files changed, 33 insertions(+), 9 deletions(-)

diff --git a/include/linux/audit.h b/include/linux/audit.h
index 690d7d8..78f51ae 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -429,6 +429,7 @@ static inline void audit_log_secctx(struct audit_buffer *ab, u32 secid)
{ }
#endif

+extern void audit_set_user_ns(struct user_namespace *ns);
extern void audit_free_user_ns(struct user_namespace *ns);

extern int audit_update_lsm_rules(void);
@@ -479,6 +480,9 @@ static inline void audit_log_link_denied(const char *string,
static inline void audit_log_secctx(struct audit_buffer *ab, u32 secid)
{ }

+static inline void audit_set_user_ns(struct user_namespace *ns)
+{ }
+
static inline void audit_free_user_ns(struct user_namespace *ns)
{ }
#define audit_enabled 0
diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h
index 8797421..e322f20 100644
--- a/include/linux/user_namespace.h
+++ b/include/linux/user_namespace.h
@@ -5,6 +5,7 @@
#include <linux/nsproxy.h>
#include <linux/sched.h>
#include <linux/err.h>
+#include <linux/skbuff.h>

#define UID_GID_MAP_MAX_EXTENTS 5

@@ -20,6 +21,7 @@ struct uid_gid_map { /* 64 bytes -- 1 cache line */
#ifdef CONFIG_AUDIT
struct audit_ctrl {
struct sock *sock;
+ struct sk_buff_head queue;
};
#endif

diff --git a/kernel/audit.c b/kernel/audit.c
index 3ae8793..2a727af 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -129,7 +129,6 @@ static DEFINE_SPINLOCK(audit_freelist_lock);
static int audit_freelist_count;
static LIST_HEAD(audit_freelist);

-static struct sk_buff_head audit_skb_queue;
/* queue of skbs to send to auditd when/if it comes back */
static struct sk_buff_head audit_skb_hold_queue;
static struct task_struct *kauditd_task;
@@ -419,6 +418,7 @@ static void kauditd_send_skb(struct sk_buff *skb)
static int kauditd_thread(void *dummy)
{
struct sk_buff *skb;
+ struct sk_buff_head *queue = &init_user_ns.audit.queue;

set_freezable();
while (!kthread_should_stop()) {
@@ -445,7 +445,7 @@ static int kauditd_thread(void *dummy)
}
}

- skb = skb_dequeue(&audit_skb_queue);
+ skb = skb_dequeue(queue);
wake_up(&audit_backlog_wait);
if (skb) {
if (audit_pid)
@@ -457,7 +457,7 @@ static int kauditd_thread(void *dummy)
set_current_state(TASK_INTERRUPTIBLE);
add_wait_queue(&kauditd_wait, &wait);

- if (!skb_queue_len(&audit_skb_queue)) {
+ if (!skb_queue_len(queue)) {
try_to_freeze();
schedule();
}
@@ -653,11 +653,13 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
struct audit_sig_info *sig_data;
char *ctx = NULL;
u32 len;
+ struct user_namespace *ns;

err = audit_netlink_ok(skb, msg_type);
if (err)
return err;

+ ns = current_user_ns();
/* As soon as there's any sign of userspace auditd,
* start kauditd to talk to it */
if (!kauditd_task) {
@@ -682,7 +684,8 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
status_set.rate_limit = audit_rate_limit;
status_set.backlog_limit = audit_backlog_limit;
status_set.lost = atomic_read(&audit_lost);
- status_set.backlog = skb_queue_len(&audit_skb_queue);
+ status_set.backlog =
+ skb_queue_len(&ns->audit.queue);
audit_send_reply(NETLINK_CB(skb).portid, seq, AUDIT_GET, 0, 0,
&status_set, sizeof(status_set));
break;
@@ -994,7 +997,7 @@ static int __init audit_init(void)
if (register_pernet_subsys(&audit_net_ops) < 0)
return -1;

- skb_queue_head_init(&audit_skb_queue);
+ audit_set_user_ns(&init_user_ns);
skb_queue_head_init(&audit_skb_hold_queue);
audit_initialized = AUDIT_INITIALIZED;
audit_enabled = audit_default;
@@ -1144,12 +1147,13 @@ static inline void audit_get_stamp(struct audit_context *ctx,
*/
static void wait_for_auditd(unsigned long sleep_time)
{
+ const struct sk_buff_head *queue = &init_user_ns.audit.queue;
DECLARE_WAITQUEUE(wait, current);
set_current_state(TASK_INTERRUPTIBLE);
add_wait_queue(&audit_backlog_wait, &wait);

if (audit_backlog_limit &&
- skb_queue_len(&audit_skb_queue) > audit_backlog_limit)
+ skb_queue_len(queue) > audit_backlog_limit)
schedule_timeout(sleep_time);

__set_current_state(TASK_RUNNING);
@@ -1186,6 +1190,7 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
unsigned int uninitialized_var(serial);
int reserve;
unsigned long timeout_start = jiffies;
+ struct sk_buff_head *queue = &init_user_ns.audit.queue;

if (audit_initialized != AUDIT_INITIALIZED)
return NULL;
@@ -1200,7 +1205,7 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
entries over the normal backlog limit */

while (audit_backlog_limit
- && skb_queue_len(&audit_skb_queue) > audit_backlog_limit + reserve) {
+ && skb_queue_len(queue) > audit_backlog_limit + reserve) {
if (gfp_mask & __GFP_WAIT && audit_backlog_wait_time) {
unsigned long sleep_time;

@@ -1214,7 +1219,7 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
printk(KERN_WARNING
"audit: audit_backlog=%d > "
"audit_backlog_limit=%d\n",
- skb_queue_len(&audit_skb_queue),
+ skb_queue_len(queue),
audit_backlog_limit);
audit_log_lost("backlog limit exceeded");
audit_backlog_wait_time = audit_backlog_wait_overflow;
@@ -1524,7 +1529,8 @@ void audit_log_end(struct audit_buffer *ab)
nlh->nlmsg_len = ab->skb->len - NLMSG_HDRLEN;

if (audit_pid) {
- skb_queue_tail(&audit_skb_queue, ab->skb);
+ skb_queue_tail(&init_user_ns.audit.queue,
+ ab->skb);
wake_up_interruptible(&kauditd_wait);
} else {
audit_printk_skb(ab->skb);
@@ -1587,6 +1593,14 @@ void audit_log_secctx(struct audit_buffer *ab, u32 secid)
EXPORT_SYMBOL(audit_log_secctx);
#endif

+void audit_set_user_ns(struct user_namespace *ns)
+{
+ if (audit_initialized == AUDIT_DISABLED)
+ return;
+
+ skb_queue_head_init(&ns->audit.queue);
+}
+
void audit_free_user_ns(struct user_namespace *ns)
{
if (audit_initialized == AUDIT_DISABLED)
@@ -1597,10 +1611,13 @@ void audit_free_user_ns(struct user_namespace *ns)
netlink_kernel_release(ns->audit.sock);
net_drop_ns(net);
}
+
+ skb_queue_purge(&ns->audit.queue);
}

EXPORT_SYMBOL(audit_log_start);
EXPORT_SYMBOL(audit_log_end);
EXPORT_SYMBOL(audit_log_format);
EXPORT_SYMBOL(audit_log);
+EXPORT_SYMBOL(audit_set_user_ns);
EXPORT_SYMBOL(audit_free_user_ns);
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index 99de920..047921a 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -100,6 +100,7 @@ int create_user_ns(struct cred *new)

update_mnt_policy(ns);

+ audit_set_user_ns(ns);
return 0;
}

--
1.8.1.4


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