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;
static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait);
static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait);
gfp_t gfp_mask;
};
+struct audit_reply {
+ int pid;
+ struct sk_buff *skb;
+};
+
static void audit_set_pid(struct audit_buffer *ab, pid_t pid)
{
if (ab) {
loginuid, sessionid, sid);
}
+/*
+ * Queue skbs to be sent to auditd when/if it comes back. These skbs should
+ * already have been sent via prink/syslog and so if these messages are dropped
+ * it is not a huge concern since we already passed the audit_log_lost()
+ * notification and stuff. This is just nice to get audit messages during
+ * boot before auditd is running or messages generated while auditd is stopped.
+ * This only holds messages is audit_default is set, aka booting with audit=1
+ * or building your kernel that way.
+ */
+static void audit_hold_skb(struct sk_buff *skb)
+{
+ if (audit_default &&
+ skb_queue_len(&audit_skb_hold_queue) < audit_backlog_limit)
+ skb_queue_tail(&audit_skb_hold_queue, skb);
+ else
+ kfree_skb(skb);
+}
+
+static void kauditd_send_skb(struct sk_buff *skb)
+{
+ int err;
+ /* take a reference in case we can't send it and we want to hold it */
+ skb_get(skb);
+ err = netlink_unicast(audit_sock, skb, audit_nlk_pid, 0);
+ if (err < 0) {
+ BUG_ON(err != -ECONNREFUSED); /* Shoudn't happen */
+ printk(KERN_ERR "audit: *NO* daemon at audit_pid=%d\n", audit_pid);
+ audit_log_lost("auditd dissapeared\n");
+ audit_pid = 0;
+ /* we might get lucky and get this in the next auditd */
+ audit_hold_skb(skb);
+ } else
+ /* drop the extra reference if sent ok */
+ kfree_skb(skb);
+}
+
static int kauditd_thread(void *dummy)
{
struct sk_buff *skb;
set_freezable();
while (!kthread_should_stop()) {
+ /*
+ * if auditd just started drain the queue of messages already
+ * sent to syslog/printk. remember loss here is ok. we already
+ * called audit_log_lost() if it didn't go out normally. so the
+ * race between the skb_dequeue and the next check for audit_pid
+ * doesn't matter.
+ *
+ * if you ever find kauditd to be too slow we can get a perf win
+ * by doing our own locking and keeping better track if there
+ * are messages in this queue. I don't see the need now, but
+ * in 5 years when I want to play with this again I'll see this
+ * note and still have no friggin idea what i'm thinking today.
+ */
+ if (audit_default && audit_pid) {
+ skb = skb_dequeue(&audit_skb_hold_queue);
+ if (unlikely(skb)) {
+ while (skb && audit_pid) {
+ kauditd_send_skb(skb);
+ skb = skb_dequeue(&audit_skb_hold_queue);
+ }
+ }
+ }
+
skb = skb_dequeue(&audit_skb_queue);
wake_up(&audit_backlog_wait);
if (skb) {
- if (audit_pid) {
- int err = netlink_unicast(audit_sock, skb, audit_nlk_pid, 0);
- if (err < 0) {
- BUG_ON(err != -ECONNREFUSED); /* Shoudn't happen */
- printk(KERN_ERR "audit: *NO* daemon at audit_pid=%d\n", audit_pid);
- audit_log_lost("auditd dissapeared\n");
- audit_pid = 0;
- }
- } else {
+ if (audit_pid)
+ kauditd_send_skb(skb);
+ else {
if (printk_ratelimit())
- printk(KERN_NOTICE "%s\n", skb->data +
- NLMSG_SPACE(0));
+ printk(KERN_NOTICE "%s\n", skb->data + NLMSG_SPACE(0));
else
audit_log_lost("printk limit exceeded\n");
- kfree_skb(skb);
+
+ audit_hold_skb(skb);
}
} else {
DECLARE_WAITQUEUE(wait, current);
int err;
read_lock(&tasklist_lock);
- tsk = find_task_by_pid(pid);
+ tsk = find_task_by_vpid(pid);
err = -ESRCH;
if (!tsk)
goto out;
return NULL;
}
+static int audit_send_reply_thread(void *arg)
+{
+ struct audit_reply *reply = (struct audit_reply *)arg;
+
+ mutex_lock(&audit_cmd_mutex);
+ mutex_unlock(&audit_cmd_mutex);
+
+ /* Ignore failure. It'll only happen if the sender goes away,
+ because our timeout is set to infinite. */
+ netlink_unicast(audit_sock, reply->skb, reply->pid, 0);
+ kfree(reply);
+ return 0;
+}
/**
* audit_send_reply - send an audit reply message via netlink
* @pid: process id to send reply to
void audit_send_reply(int pid, int seq, int type, int done, int multi,
void *payload, int size)
{
- struct sk_buff *skb;
+ struct sk_buff *skb;
+ struct task_struct *tsk;
+ struct audit_reply *reply = kmalloc(sizeof(struct audit_reply),
+ GFP_KERNEL);
+
+ if (!reply)
+ return;
+
skb = audit_make_reply(pid, seq, type, done, multi, payload, size);
if (!skb)
return;
- /* Ignore failure. It'll only happen if the sender goes away,
- because our timeout is set to infinite. */
- netlink_unicast(audit_sock, skb, pid, 0);
- return;
+
+ reply->pid = pid;
+ reply->skb = skb;
+
+ tsk = kthread_run(audit_send_reply_thread, reply, "audit_send_reply");
+ if (IS_ERR(tsk)) {
+ kfree(reply);
+ kfree_skb(skb);
+ }
}
/*
audit_log_format(ab, " msg=");
size = nlmsg_len(nlh);
- audit_log_n_untrustedstring(ab, size,
- data);
+ audit_log_n_untrustedstring(ab, data, size);
}
audit_set_pid(ab, pid);
audit_log_end(ab);
case AUDIT_MAKE_EQUIV: {
void *bufp = data;
u32 sizes[2];
- size_t len = nlmsg_len(nlh);
+ size_t msglen = nlmsg_len(nlh);
char *old, *new;
err = -EINVAL;
- if (len < 2 * sizeof(u32))
+ if (msglen < 2 * sizeof(u32))
break;
memcpy(sizes, bufp, 2 * sizeof(u32));
bufp += 2 * sizeof(u32);
- len -= 2 * sizeof(u32);
- old = audit_unpack_string(&bufp, &len, sizes[0]);
+ msglen -= 2 * sizeof(u32);
+ old = audit_unpack_string(&bufp, &msglen, sizes[0]);
if (IS_ERR(old)) {
err = PTR_ERR(old);
break;
}
- new = audit_unpack_string(&bufp, &len, sizes[1]);
+ new = audit_unpack_string(&bufp, &msglen, sizes[1]);
if (IS_ERR(new)) {
err = PTR_ERR(new);
kfree(old);
struct task_struct *tsk;
read_lock(&tasklist_lock);
- tsk = find_task_by_pid(pid);
+ tsk = find_task_by_vpid(pid);
if (!tsk)
err = -ESRCH;
else {
if (s->enabled != 0 && s->enabled != 1)
return -EINVAL;
read_lock(&tasklist_lock);
- tsk = find_task_by_pid(pid);
+ tsk = find_task_by_vpid(pid);
if (!tsk)
err = -ESRCH;
else {
audit_sock->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
skb_queue_head_init(&audit_skb_queue);
+ skb_queue_head_init(&audit_skb_hold_queue);
audit_initialized = 1;
audit_enabled = audit_default;
audit_ever_enabled |= !!audit_default;
* This function will take the passed buf and convert it into a string of
* ascii hex digits. The new string is placed onto the skb.
*/
-void audit_log_hex(struct audit_buffer *ab, const unsigned char *buf,
+void audit_log_n_hex(struct audit_buffer *ab, const unsigned char *buf,
size_t len)
{
int i, avail, new_len;
* Format a string of no more than slen characters into the audit buffer,
* enclosed in quote marks.
*/
-static void audit_log_n_string(struct audit_buffer *ab, size_t slen,
- const char *string)
+void audit_log_n_string(struct audit_buffer *ab, const char *string,
+ size_t slen)
{
int avail, new_len;
unsigned char *ptr;
* The caller specifies the number of characters in the string to log, which may
* or may not be the entire string.
*/
-void audit_log_n_untrustedstring(struct audit_buffer *ab, size_t len,
- const char *string)
+void audit_log_n_untrustedstring(struct audit_buffer *ab, const char *string,
+ size_t len)
{
if (audit_string_contains_control(string, len))
- audit_log_hex(ab, string, len);
+ audit_log_n_hex(ab, string, len);
else
- audit_log_n_string(ab, len, string);
+ audit_log_n_string(ab, string, len);
}
/**
*/
void audit_log_untrustedstring(struct audit_buffer *ab, const char *string)
{
- audit_log_n_untrustedstring(ab, strlen(string), string);
+ audit_log_n_untrustedstring(ab, string, strlen(string));
}
/* This is a helper-function to print the escaped d_path */
audit_log_lost("rate limit exceeded");
} else {
struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
+ nlh->nlmsg_len = ab->skb->len - NLMSG_SPACE(0);
+
if (audit_pid) {
- nlh->nlmsg_len = ab->skb->len - NLMSG_SPACE(0);
skb_queue_tail(&audit_skb_queue, ab->skb);
- ab->skb = NULL;
wake_up_interruptible(&kauditd_wait);
- } else if (nlh->nlmsg_type != AUDIT_EOE) {
- if (printk_ratelimit()) {
- printk(KERN_NOTICE "type=%d %s\n",
- nlh->nlmsg_type,
- ab->skb->data + NLMSG_SPACE(0));
- } else
- audit_log_lost("printk limit exceeded\n");
+ } else {
+ if (nlh->nlmsg_type != AUDIT_EOE) {
+ if (printk_ratelimit()) {
+ printk(KERN_NOTICE "type=%d %s\n",
+ nlh->nlmsg_type,
+ ab->skb->data + NLMSG_SPACE(0));
+ } else
+ audit_log_lost("printk limit exceeded\n");
+ }
+ audit_hold_skb(ab->skb);
}
+ ab->skb = NULL;
}
audit_buffer_free(ab);
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff