[ARCHIVE DEBUG 03/13] audit_debug: proc instrumentation

[Steve Grubb]

What is the permissions on this? Who can view it?

-Steve

On Thursday, October 22, 2015 02:58:49 PM Richard Guy Briggs wrote:
> Add a /proc/audit entry for debugging to instrument many audit subsystem
> internal parameters not normally visible.
> 
> Signed-off-by: Richard Guy Briggs <rgb at redhat.com>
> ---
>  include/linux/skbuff.h |   16 ++++++++++++++++
>  kernel/audit.c         |   48
> ++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 64
> insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
> index f54d665..bcde922 100644
> --- a/include/linux/skbuff.h
> +++ b/include/linux/skbuff.h
> @@ -180,6 +180,7 @@ struct sk_buff_head {
> 
>  	__u32		qlen;
>  	spinlock_t	lock;
> +	__u32		qlen_max;
>  };
> 
>  struct sk_buff;
> @@ -1301,6 +1302,11 @@ static inline __u32 skb_queue_len(const struct
> sk_buff_head *list_) return list_->qlen;
>  }
> 
> +static inline __u32 skb_queue_len_max(const struct sk_buff_head *list_)
> +{
> +	return list_->qlen_max;
> +}
> +
>  /**
>   *	__skb_queue_head_init - initialize non-spinlock portions of sk_buff_head
> *	@list: queue to initialize
> @@ -1354,6 +1360,8 @@ static inline void __skb_insert(struct sk_buff *newsk,
> newsk->prev = prev;
>  	next->prev  = prev->next = newsk;
>  	list->qlen++;
> +	if(list->qlen > list->qlen_max)
> +		list->qlen_max = list->qlen;
>  }
> 
>  static inline void __skb_queue_splice(const struct sk_buff_head *list,
> @@ -1381,6 +1389,8 @@ static inline void skb_queue_splice(const struct
> sk_buff_head *list, if (!skb_queue_empty(list)) {
>  		__skb_queue_splice(list, (struct sk_buff *) head, head->next);
>  		head->qlen += list->qlen;
> +		if(head->qlen > head->qlen_max)
> +			head->qlen_max = head->qlen;
>  	}
>  }
> 
> @@ -1397,6 +1407,8 @@ static inline void skb_queue_splice_init(struct
> sk_buff_head *list, if (!skb_queue_empty(list)) {
>  		__skb_queue_splice(list, (struct sk_buff *) head, head->next);
>  		head->qlen += list->qlen;
> +		if(head->qlen > head->qlen_max)
> +			head->qlen_max = head->qlen;
>  		__skb_queue_head_init(list);
>  	}
>  }
> @@ -1412,6 +1424,8 @@ static inline void skb_queue_splice_tail(const struct
> sk_buff_head *list, if (!skb_queue_empty(list)) {
>  		__skb_queue_splice(list, head->prev, (struct sk_buff *) head);
>  		head->qlen += list->qlen;
> +		if(head->qlen > head->qlen_max)
> +			head->qlen_max = head->qlen;
>  	}
>  }
> 
> @@ -1429,6 +1443,8 @@ static inline void skb_queue_splice_tail_init(struct
> sk_buff_head *list, if (!skb_queue_empty(list)) {
>  		__skb_queue_splice(list, head->prev, (struct sk_buff *) head);
>  		head->qlen += list->qlen;
> +		if(head->qlen > head->qlen_max)
> +			head->qlen_max = head->qlen;
>  		__skb_queue_head_init(list);
>  	}
>  }
> diff --git a/kernel/audit.c b/kernel/audit.c
> index d4e19fc..82df9fd 100644
> --- a/kernel/audit.c
> +++ b/kernel/audit.c
> @@ -124,6 +124,7 @@ u32		audit_sig_sid = 0;
>     4) suppressed due to audit_backlog_limit
>  */
>  static atomic_t    audit_lost = ATOMIC_INIT(0);
> +static atomic_t    audit_hold_lost = ATOMIC_INIT(0);
> 
>  /* The netlink socket. */
>  static struct sock *audit_sock;
> @@ -381,7 +382,10 @@ static void audit_hold_skb(struct sk_buff *skb)
>  	     skb_queue_len(&audit_skb_hold_queue) < audit_backlog_limit))
>  		skb_queue_tail(&audit_skb_hold_queue, skb);
>  	else
> +	{
>  		kfree_skb(skb);
> +		atomic_inc(&audit_hold_lost);
> +	}
>  }
> 
>  /*
> @@ -510,7 +514,10 @@ static void flush_hold_queue(void)
>  	 * dequeued an skb we need to drop ref
>  	 */
>  	if (skb)
> +	{
>  		consume_skb(skb);
> +		atomic_inc(&audit_hold_lost);
> +	}
>  }
> 
>  static int kauditd_thread(void *dummy)
> @@ -1174,6 +1181,45 @@ static struct pernet_operations audit_net_ops
> __net_initdata = { .size = sizeof(struct audit_net),
>  };
> 
> +/* Display information about audit subsystem */
> +static int proc_auditstats_show(struct seq_file *m, void *v)
> +{
> +	//seq_printf(m, "audit_initialized\t%d\n", audit_initialized);
> +	//seq_printf(m, "audit_enabled\t%u\n", audit_enabled);
> +	//seq_printf(m, "audit_ever_enabled\t%u\n", audit_ever_enabled);
> +	//seq_printf(m, "audit_default\t%u\n", audit_default);
> +	//seq_printf(m, "audit_failure\t%u\n", audit_failure);
> +	seq_printf(m, "audit_pid\t\t\t%d\n", audit_pid);
> +	//seq_printf(m, "audit_nlk_portid\t%u\n", audit_nlk_portid);
> +	//seq_printf(m, "audit_rate_limit\t%u\n", audit_rate_limit);
> +	//seq_printf(m, "audit_backlog_limit\t%u\n", audit_backlog_limit);
> +	//seq_printf(m, "audit_backlog_wait_time\t%u\n", audit_backlog_wait_time);
> +	//seq_printf(m, "audit_sig_uid\t%u\n", from_kuid(&init_user_ns,
> audit_sig_uid)); +	//seq_printf(m, "audit_sig_pid\t%d\n", audit_sig_pid);
> +	//seq_printf(m, "audit_sig_sid\t%u\n", audit_sig_sid);
> +	seq_printf(m, "audit_lost\t\t\t%d\n", atomic_read(&audit_lost));
> +	seq_printf(m, "audit_hold_lost\t\t\t%d\n", atomic_read(&audit_hold_lost));
> +	seq_printf(m, "audit_freelist_count\t\t%u\n", audit_freelist_count);
> +	seq_printf(m, "audit_skb_queue len\t\t%d\n",
> skb_queue_len(&audit_skb_queue)); +	seq_printf(m, "audit_skb_queue
> len_max\t\t%d\n", skb_queue_len_max(&audit_skb_queue)); +	seq_printf(m,
> "audit_skb_hold_queue len\t%d\n", skb_queue_len(&audit_skb_hold_queue));
> +	seq_printf(m, "audit_skb_hold_queue len_max\t%d\n",
> skb_queue_len_max(&audit_skb_hold_queue)); +
> +	return 0;
> +}
> +
> +static int auditstats_open(struct inode *inode, struct file *file)
> +{
> +	return single_open(file, proc_auditstats_show, NULL);
> +}
> +
> +static const struct file_operations proc_auditstats_operations = {
> +	.open = auditstats_open,
> +	.read = seq_read,
> +	.llseek = seq_lseek,
> +	.release = single_release,
> +};
> +
>  /* Initialize audit support at boot time. */
>  static int __init audit_init(void)
>  {
> @@ -1197,6 +1243,8 @@ static int __init audit_init(void)
>  	for (i = 0; i < AUDIT_INODE_BUCKETS; i++)
>  		INIT_LIST_HEAD(&audit_inode_hash[i]);
> 
> +	proc_create("audit", 0, NULL, &proc_auditstats_operations);
> +
>  	return 0;
>  }
>  __initcall(audit_init);