[PATCH] audit: make sure we don't let the retry queue grow without bounds
by Paul Moore
From: Paul Moore <paul(a)paul-moore.com>
The retry queue is intended to provide a temporary buffer in the case
of transient errors when communicating with auditd, it is not meant
as a long life queue, that functionality is provided by the hold
queue.
This patch fixes a problem identified by Seth where the retry queue
could grow uncontrollably if an auditd instance did not connect to
the kernel to drain the queues. This commit fixes this by doing the
following:
* Make sure we always call auditd_reset() if we decide the connection
with audit is really dead. There were some cases in
kauditd_hold_skb() where we did not reset the connection, this patch
relocates the reset calls to kauditd_thread() so all the error
conditions are caught and the connection reset. As a side effect,
this means we could move auditd_reset() and get rid of the forward
definition at the top of kernel/audit.c.
* We never checked the status of the auditd connection when
processing the main audit queue which meant that the retry queue
could grow unchecked. This patch adds a call to auditd_reset()
after the main queue has been processed if auditd is not connected,
the auditd_reset() call will make sure the retry and hold queues are
correctly managed/flushed so that the retry queue remains reasonable.
Reported-by: Seth Forshee <seth.forshee(a)canonical.com>
Signed-off-by: Paul Moore <paul(a)paul-moore.com>
---
kernel/audit.c | 67 +++++++++++++++++++++++++++-----------------------------
1 file changed, 32 insertions(+), 35 deletions(-)
diff --git a/kernel/audit.c b/kernel/audit.c
index 2f4964cfde0b..a871bf80fde1 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -160,7 +160,6 @@ static LIST_HEAD(audit_freelist);
/* queue msgs to send via kauditd_task */
static struct sk_buff_head audit_queue;
-static void kauditd_hold_skb(struct sk_buff *skb);
/* queue msgs due to temporary unicast send problems */
static struct sk_buff_head audit_retry_queue;
/* queue msgs waiting for new auditd connection */
@@ -454,30 +453,6 @@ static void auditd_set(int pid, u32 portid, struct net *net)
}
/**
- * auditd_reset - Disconnect the auditd connection
- *
- * Description:
- * Break the auditd/kauditd connection and move all the queued records into the
- * hold queue in case auditd reconnects.
- */
-static void auditd_reset(void)
-{
- struct sk_buff *skb;
-
- /* if it isn't already broken, break the connection */
- rcu_read_lock();
- if (auditd_conn.pid)
- auditd_set(0, 0, NULL);
- rcu_read_unlock();
-
- /* flush all of the main and retry queues to the hold queue */
- while ((skb = skb_dequeue(&audit_retry_queue)))
- kauditd_hold_skb(skb);
- while ((skb = skb_dequeue(&audit_queue)))
- kauditd_hold_skb(skb);
-}
-
-/**
* kauditd_print_skb - Print the audit record to the ring buffer
* @skb: audit record
*
@@ -505,9 +480,6 @@ static void kauditd_rehold_skb(struct sk_buff *skb)
{
/* put the record back in the queue at the same place */
skb_queue_head(&audit_hold_queue, skb);
-
- /* fail the auditd connection */
- auditd_reset();
}
/**
@@ -544,9 +516,6 @@ static void kauditd_hold_skb(struct sk_buff *skb)
/* we have no other options - drop the message */
audit_log_lost("kauditd hold queue overflow");
kfree_skb(skb);
-
- /* fail the auditd connection */
- auditd_reset();
}
/**
@@ -567,6 +536,30 @@ static void kauditd_retry_skb(struct sk_buff *skb)
}
/**
+ * auditd_reset - Disconnect the auditd connection
+ *
+ * Description:
+ * Break the auditd/kauditd connection and move all the queued records into the
+ * hold queue in case auditd reconnects.
+ */
+static void auditd_reset(void)
+{
+ struct sk_buff *skb;
+
+ /* if it isn't already broken, break the connection */
+ rcu_read_lock();
+ if (auditd_conn.pid)
+ auditd_set(0, 0, NULL);
+ rcu_read_unlock();
+
+ /* flush all of the main and retry queues to the hold queue */
+ while ((skb = skb_dequeue(&audit_retry_queue)))
+ kauditd_hold_skb(skb);
+ while ((skb = skb_dequeue(&audit_queue)))
+ kauditd_hold_skb(skb);
+}
+
+/**
* auditd_send_unicast_skb - Send a record via unicast to auditd
* @skb: audit record
*
@@ -758,6 +751,7 @@ static int kauditd_thread(void *dummy)
NULL, kauditd_rehold_skb);
if (rc < 0) {
sk = NULL;
+ auditd_reset();
goto main_queue;
}
@@ -767,6 +761,7 @@ static int kauditd_thread(void *dummy)
NULL, kauditd_hold_skb);
if (rc < 0) {
sk = NULL;
+ auditd_reset();
goto main_queue;
}
@@ -775,16 +770,18 @@ static int kauditd_thread(void *dummy)
* unicast, dump failed record sends to the retry queue; if
* sk == NULL due to previous failures we will just do the
* multicast send and move the record to the retry queue */
- kauditd_send_queue(sk, portid, &audit_queue, 1,
- kauditd_send_multicast_skb,
- kauditd_retry_skb);
+ rc = kauditd_send_queue(sk, portid, &audit_queue, 1,
+ kauditd_send_multicast_skb,
+ kauditd_retry_skb);
+ if (sk == NULL || rc < 0)
+ auditd_reset();
+ sk = NULL;
/* drop our netns reference, no auditd sends past this line */
if (net) {
put_net(net);
net = NULL;
}
- sk = NULL;
/* we have processed all the queues so wake everyone */
wake_up(&audit_backlog_wait);
7 years, 8 months
Result of auditctl -s
by warron.french
Hi can someone tell me what I need to do, if anything, about failure: 1
after executing *auditctl -s* please?
I am trying to troubleshoot but cannot find anything that looks obvious in
either my
*/var/log/audit/audit.log* or my */var/log/messages* files.
I am working on a Puppet Module to implement this stuff and I am not sure
if I am running into a conflict of restarting the auditd service after
either/both of the files /etc/audit/audit.rules or /etc/audit/auditd.conf
are updated.
Thanks in advance,
--------------------------
Warron French
7 years, 8 months
audit 2.7.5 released
by Steve Grubb
Hello,
I've just released a new version of the audit daemon. It can be downloaded
from http://people.redhat.com/sgrubb/audit. It will also be in rawhide
soon. The ChangeLog is:
- In auparse, output socket family name if unsupported but known
- In auparse, store arch & syscall fields in SECCOMP records for
interpretation
- In auparse_normalize, create an event_kind for seccomp events
- In auparse, when interpreting discard 'unknown' enriched fields
This release has less development than normal. This is because I run across
two bugs that I thought merit getting an updated audit daemon out sooner than
later. The first bug was reported Laurent Bigonville where it was noticed that
ausearch could be caused to segfault when it encountered a PF_PACKET socket
address.
The other bug was that SECCOMP events were not resolving the syscall when the
enriched event logging format was being used. This was corrected both in the
creation of records and in searching records that already had bad data in
them.
SHA256: 9ca4142fb6809367070a3f3449979055fa2daeb12a0a88c4874a0cfd02133922
Please let me know if you run across any problems with this release.
-Steve
7 years, 8 months
[RFC PATCH] audit: fix auditd/kernel connection state tracking
by Paul Moore
From: Paul Moore <paul(a)paul-moore.com>
What started as a rather straightforward race condition reported by
Dmitry using the syzkaller fuzzer ended up revealing some major
problems with how the audit subsystem managed its netlink sockets and
its connection with the userspace audit daemon. Fixing this properly
had quite the cascading effect and what we are left with is this rather
large and complicated patch. My initial goal was to try and decompose
this patch into multiple smaller patches, but the way these changes
are intertwined makes it difficult to split these changes into
meaningful pieces that don't break or somehow make things worse for
the intermediate states.
The patch makes a number of changes, but the most significant are
highlighted below:
* The auditd tracking variables, e.g. audit_sock, are now gone and
replaced by a RCU/spin_lock protected variable auditd_conn which is
a structure containing all of the auditd tracking information.
* We no longer track the auditd sock directly, instead we track it
via the network namespace in which it resides and we use the audit
socket associated with that namespace. In spirit, this is what the
code was trying to do prior to this patch (at least I think that is
what the original authors intended), but it was done rather poorly
and added a layer of obfuscation that only masked the underlying
problems.
* Big backlog queue cleanup, again. In v4.10 we made some pretty big
changes to how the audit backlog queues work, here we haven't changed
the queue design so much as cleaned up the implementation. Brought
about by the locking changes, we've simplified kauditd_thread() quite
a bit by consolidating the queue handling into a new helper function,
kauditd_send_queue(), which allows us to eliminate a lot of very
similar code and makes the looping logic in kauditd_thread() clearer.
* All netlink messages sent to auditd are now sent via
auditd_send_unicast_skb(). Other than just making sense, this makes
the lock handling easier.
* Change the audit_log_start() sleep behavior so that we never sleep
on auditd events (unchanged) or if the caller is holding the
audit_cmd_mutex (changed). Previously we didn't sleep if the caller
was auditd or if the message type fell between a certain range; the
type check was a poor effort of doing what the cmd_mutex check now
does. Richard Guy Briggs originally proposed not sleeping the
cmd_mutex owner several years ago but his patch wasn't acceptable
at the time. At least the idea lives on here.
* A problem with the lost record counter has been resolved. Steve
Grubb and I both happened to notice this problem and according to
some quick testing by Steve, this problem goes back quite some time.
It's largely a harmless problem, although it may have left some
careful sysadmins quite puzzled.
Cc: <stable(a)vger.kernel.org> # 4.10.x-
Reported-by: Dmitry Vyukov <dvyukov(a)google.com>
Signed-off-by: Paul Moore <paul(a)paul-moore.com>
---
kernel/audit.c | 639 +++++++++++++++++++++++++++++++++---------------------
kernel/audit.h | 9 -
kernel/auditsc.c | 6 -
3 files changed, 399 insertions(+), 255 deletions(-)
diff --git a/kernel/audit.c b/kernel/audit.c
index e794544f5e63..2f4964cfde0b 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -54,6 +54,10 @@
#include <linux/kthread.h>
#include <linux/kernel.h>
#include <linux/syscalls.h>
+#include <linux/spinlock.h>
+#include <linux/rcupdate.h>
+#include <linux/mutex.h>
+#include <linux/gfp.h>
#include <linux/audit.h>
@@ -90,13 +94,34 @@ static u32 audit_default;
/* If auditing cannot proceed, audit_failure selects what happens. */
static u32 audit_failure = AUDIT_FAIL_PRINTK;
-/*
- * If audit records are to be written to the netlink socket, audit_pid
- * contains the pid of the auditd process and audit_nlk_portid contains
- * the portid to use to send netlink messages to that process.
+/* private audit network namespace index */
+static unsigned int audit_net_id;
+
+/**
+ * struct audit_net - audit private network namespace data
+ * @sk: communication socket
+ */
+struct audit_net {
+ struct sock *sk;
+};
+
+/**
+ * struct auditd_connection - kernel/auditd connection state
+ * @pid: auditd PID
+ * @portid: netlink portid
+ * @net: the associated network namespace
+ * @lock: spinlock to protect write access
+ *
+ * Description:
+ * This struct is RCU protected; you must either hold the RCU lock for reading
+ * or the included spinlock for writing.
*/
-int audit_pid;
-static __u32 audit_nlk_portid;
+static struct auditd_connection {
+ int pid;
+ u32 portid;
+ struct net *net;
+ spinlock_t lock;
+} auditd_conn;
/* If audit_rate_limit is non-zero, limit the rate of sending audit records
* to that number per second. This prevents DoS attacks, but results in
@@ -123,10 +148,6 @@ u32 audit_sig_sid = 0;
*/
static atomic_t audit_lost = ATOMIC_INIT(0);
-/* The netlink socket. */
-static struct sock *audit_sock;
-static unsigned int audit_net_id;
-
/* Hash for inode-based rules */
struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
@@ -139,6 +160,7 @@ static LIST_HEAD(audit_freelist);
/* queue msgs to send via kauditd_task */
static struct sk_buff_head audit_queue;
+static void kauditd_hold_skb(struct sk_buff *skb);
/* queue msgs due to temporary unicast send problems */
static struct sk_buff_head audit_retry_queue;
/* queue msgs waiting for new auditd connection */
@@ -192,6 +214,43 @@ struct audit_reply {
struct sk_buff *skb;
};
+/**
+ * auditd_test_task - Check to see if a given task is an audit daemon
+ * @task: the task to check
+ *
+ * Description:
+ * Return 1 if the task is a registered audit daemon, 0 otherwise.
+ */
+int auditd_test_task(const struct task_struct *task)
+{
+ int rc;
+
+ rcu_read_lock();
+ rc = (auditd_conn.pid && task->tgid == auditd_conn.pid ? 1 : 0);
+ rcu_read_unlock();
+
+ return rc;
+}
+
+/**
+ * audit_get_sk - Return the audit socket for the given network namespace
+ * @net: the destination network namespace
+ *
+ * Description:
+ * Returns the sock pointer if valid, NULL otherwise. The caller must ensure
+ * that a reference is held for the network namespace while the sock is in use.
+ */
+static struct sock *audit_get_sk(const struct net *net)
+{
+ struct audit_net *aunet;
+
+ if (!net)
+ return NULL;
+
+ aunet = net_generic(net, audit_net_id);
+ return aunet->sk;
+}
+
static void audit_set_portid(struct audit_buffer *ab, __u32 portid)
{
if (ab) {
@@ -210,9 +269,7 @@ void audit_panic(const char *message)
pr_err("%s\n", message);
break;
case AUDIT_FAIL_PANIC:
- /* test audit_pid since printk is always losey, why bother? */
- if (audit_pid)
- panic("audit: %s\n", message);
+ panic("audit: %s\n", message);
break;
}
}
@@ -370,21 +427,87 @@ static int audit_set_failure(u32 state)
return audit_do_config_change("audit_failure", &audit_failure, state);
}
-/*
- * For one reason or another this nlh isn't getting delivered to the userspace
- * audit daemon, just send it to printk.
+/**
+ * auditd_set - Set/Reset the auditd connection state
+ * @pid: auditd PID
+ * @portid: auditd netlink portid
+ * @net: auditd network namespace pointer
+ *
+ * Description:
+ * This function will obtain and drop network namespace references as
+ * necessary.
+ */
+static void auditd_set(int pid, u32 portid, struct net *net)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&auditd_conn.lock, flags);
+ auditd_conn.pid = pid;
+ auditd_conn.portid = portid;
+ if (auditd_conn.net)
+ put_net(auditd_conn.net);
+ if (net)
+ auditd_conn.net = get_net(net);
+ else
+ auditd_conn.net = NULL;
+ spin_unlock_irqrestore(&auditd_conn.lock, flags);
+}
+
+/**
+ * auditd_reset - Disconnect the auditd connection
+ *
+ * Description:
+ * Break the auditd/kauditd connection and move all the queued records into the
+ * hold queue in case auditd reconnects.
+ */
+static void auditd_reset(void)
+{
+ struct sk_buff *skb;
+
+ /* if it isn't already broken, break the connection */
+ rcu_read_lock();
+ if (auditd_conn.pid)
+ auditd_set(0, 0, NULL);
+ rcu_read_unlock();
+
+ /* flush all of the main and retry queues to the hold queue */
+ while ((skb = skb_dequeue(&audit_retry_queue)))
+ kauditd_hold_skb(skb);
+ while ((skb = skb_dequeue(&audit_queue)))
+ kauditd_hold_skb(skb);
+}
+
+/**
+ * kauditd_print_skb - Print the audit record to the ring buffer
+ * @skb: audit record
+ *
+ * Whatever the reason, this packet may not make it to the auditd connection
+ * so write it via printk so the information isn't completely lost.
*/
static void kauditd_printk_skb(struct sk_buff *skb)
{
struct nlmsghdr *nlh = nlmsg_hdr(skb);
char *data = nlmsg_data(nlh);
- if (nlh->nlmsg_type != AUDIT_EOE) {
- if (printk_ratelimit())
- pr_notice("type=%d %s\n", nlh->nlmsg_type, data);
- else
- audit_log_lost("printk limit exceeded");
- }
+ if (nlh->nlmsg_type != AUDIT_EOE && printk_ratelimit())
+ pr_notice("type=%d %s\n", nlh->nlmsg_type, data);
+}
+
+/**
+ * kauditd_rehold_skb - Handle a audit record send failure in the hold queue
+ * @skb: audit record
+ *
+ * Description:
+ * This should only be used by the kauditd_thread when it fails to flush the
+ * hold queue.
+ */
+static void kauditd_rehold_skb(struct sk_buff *skb)
+{
+ /* put the record back in the queue at the same place */
+ skb_queue_head(&audit_hold_queue, skb);
+
+ /* fail the auditd connection */
+ auditd_reset();
}
/**
@@ -421,6 +544,9 @@ static void kauditd_hold_skb(struct sk_buff *skb)
/* we have no other options - drop the message */
audit_log_lost("kauditd hold queue overflow");
kfree_skb(skb);
+
+ /* fail the auditd connection */
+ auditd_reset();
}
/**
@@ -441,51 +567,122 @@ static void kauditd_retry_skb(struct sk_buff *skb)
}
/**
- * auditd_reset - Disconnect the auditd connection
+ * auditd_send_unicast_skb - Send a record via unicast to auditd
+ * @skb: audit record
*
* Description:
- * Break the auditd/kauditd connection and move all the records in the retry
- * queue into the hold queue in case auditd reconnects. The audit_cmd_mutex
- * must be held when calling this function.
+ * Send a skb to the audit daemon, returns positive/zero values on success and
+ * negative values on failure; in all cases the skb will be consumed by this
+ * function. If the send results in -ECONNREFUSED the connection with auditd
+ * will be reset. This function may sleep so callers should not hold any locks
+ * where this would cause a problem.
*/
-static void auditd_reset(void)
+static int auditd_send_unicast_skb(struct sk_buff *skb)
{
- struct sk_buff *skb;
-
- /* break the connection */
- if (audit_sock) {
- sock_put(audit_sock);
- audit_sock = NULL;
+ int rc;
+ u32 portid;
+ struct net *net;
+ struct sock *sk;
+
+ /* NOTE: we can't call netlink_unicast while in the RCU section so
+ * take a reference to the network namespace and grab local
+ * copies of the namespace, the sock, and the portid; the
+ * namespace and sock aren't going to go away while we hold a
+ * reference and if the portid does become invalid after the RCU
+ * section netlink_unicast() should safely return an error */
+
+ rcu_read_lock();
+ if (!auditd_conn.pid) {
+ rcu_read_unlock();
+ rc = -ECONNREFUSED;
+ goto err;
}
- audit_pid = 0;
- audit_nlk_portid = 0;
+ net = auditd_conn.net;
+ get_net(net);
+ sk = audit_get_sk(net);
+ portid = auditd_conn.portid;
+ rcu_read_unlock();
- /* flush all of the retry queue to the hold queue */
- while ((skb = skb_dequeue(&audit_retry_queue)))
- kauditd_hold_skb(skb);
+ rc = netlink_unicast(sk, skb, portid, 0);
+ put_net(net);
+ if (rc < 0)
+ goto err;
+
+ return rc;
+
+err:
+ if (rc == -ECONNREFUSED)
+ auditd_reset();
+ return rc;
}
/**
- * kauditd_send_unicast_skb - Send a record via unicast to auditd
- * @skb: audit record
+ * kauditd_send_queue - Helper for kauditd_thread to flush skb queues
+ * @sk: the sending sock
+ * @portid: the netlink destination
+ * @queue: the skb queue to process
+ * @retry_limit: limit on number of netlink unicast failures
+ * @skb_hook: per-skb hook for additional processing
+ * @err_hook: hook called if the skb fails the netlink unicast send
+ *
+ * Description:
+ * Run through the given queue and attempt to send the audit records to auditd,
+ * returns zero on success, negative values on failure. It is up to the caller
+ * to ensure that the @sk is valid for the duration of this function.
+ *
*/
-static int kauditd_send_unicast_skb(struct sk_buff *skb)
+static int kauditd_send_queue(struct sock *sk, u32 portid,
+ struct sk_buff_head *queue,
+ unsigned int retry_limit,
+ void (*skb_hook)(struct sk_buff *skb),
+ void (*err_hook)(struct sk_buff *skb))
{
- int rc;
+ int rc = 0;
+ struct sk_buff *skb;
+ static unsigned int failed = 0;
- /* if we know nothing is connected, don't even try the netlink call */
- if (!audit_pid)
- return -ECONNREFUSED;
+ /* NOTE: kauditd_thread takes care of all our locking, we just use
+ * the netlink info passed to us (e.g. sk and portid) */
+
+ while ((skb = skb_dequeue(queue))) {
+ /* call the skb_hook for each skb we touch */
+ if (skb_hook)
+ (*skb_hook)(skb);
+
+ /* can we send to anyone via unicast? */
+ if (!sk) {
+ if (err_hook)
+ (*err_hook)(skb);
+ continue;
+ }
- /* get an extra skb reference in case we fail to send */
- skb_get(skb);
- rc = netlink_unicast(audit_sock, skb, audit_nlk_portid, 0);
- if (rc >= 0) {
- consume_skb(skb);
- rc = 0;
+ /* grab an extra skb reference in case of error */
+ skb_get(skb);
+ rc = netlink_unicast(sk, skb, portid, 0);
+ if (rc < 0) {
+ /* fatal failure for our queue flush attempt? */
+ if (++failed >= retry_limit ||
+ rc == -ECONNREFUSED || rc == -EPERM) {
+ /* yes - error processing for the queue */
+ sk = NULL;
+ if (err_hook)
+ (*err_hook)(skb);
+ if (!skb_hook)
+ goto out;
+ /* keep processing with the skb_hook */
+ continue;
+ } else
+ /* no - requeue to preserve ordering */
+ skb_queue_head(queue, skb);
+ } else {
+ /* it worked - drop the extra reference and continue */
+ consume_skb(skb);
+ failed = 0;
+ }
}
- return rc;
+out:
+ return (rc >= 0 ? 0 : rc);
}
/*
@@ -493,16 +690,19 @@ static int kauditd_send_unicast_skb(struct sk_buff *skb)
* @skb: audit record
*
* Description:
- * This function doesn't consume an skb as might be expected since it has to
- * copy it anyways.
+ * Write a multicast message to anyone listening in the initial network
+ * namespace. This function doesn't consume an skb as might be expected since
+ * it has to copy it anyways.
*/
static void kauditd_send_multicast_skb(struct sk_buff *skb)
{
struct sk_buff *copy;
- struct audit_net *aunet = net_generic(&init_net, audit_net_id);
- struct sock *sock = aunet->nlsk;
+ struct sock *sock = audit_get_sk(&init_net);
struct nlmsghdr *nlh;
+ /* NOTE: we are not taking an additional reference for init_net since
+ * we don't have to worry about it going away */
+
if (!netlink_has_listeners(sock, AUDIT_NLGRP_READLOG))
return;
@@ -526,149 +726,75 @@ static void kauditd_send_multicast_skb(struct sk_buff *skb)
}
/**
- * kauditd_wake_condition - Return true when it is time to wake kauditd_thread
- *
- * Description:
- * This function is for use by the wait_event_freezable() call in
- * kauditd_thread().
+ * kauditd_thread - Worker thread to send audit records to userspace
+ * @dummy: unused
*/
-static int kauditd_wake_condition(void)
-{
- static int pid_last = 0;
- int rc;
- int pid = audit_pid;
-
- /* wake on new messages or a change in the connected auditd */
- rc = skb_queue_len(&audit_queue) || (pid && pid != pid_last);
- if (rc)
- pid_last = pid;
-
- return rc;
-}
-
static int kauditd_thread(void *dummy)
{
int rc;
- int auditd = 0;
- int reschedule = 0;
- struct sk_buff *skb;
- struct nlmsghdr *nlh;
+ u32 portid = 0;
+ struct net *net = NULL;
+ struct sock *sk = NULL;
#define UNICAST_RETRIES 5
-#define AUDITD_BAD(x,y) \
- ((x) == -ECONNREFUSED || (x) == -EPERM || ++(y) >= UNICAST_RETRIES)
-
- /* NOTE: we do invalidate the auditd connection flag on any sending
- * errors, but we only "restore" the connection flag at specific places
- * in the loop in order to help ensure proper ordering of audit
- * records */
set_freezable();
while (!kthread_should_stop()) {
- /* NOTE: possible area for future improvement is to look at
- * the hold and retry queues, since only this thread
- * has access to these queues we might be able to do
- * our own queuing and skip some/all of the locking */
-
- /* NOTE: it might be a fun experiment to split the hold and
- * retry queue handling to another thread, but the
- * synchronization issues and other overhead might kill
- * any performance gains */
+ /* NOTE: see the lock comments in auditd_send_unicast_skb() */
+ rcu_read_lock();
+ if (!auditd_conn.pid) {
+ rcu_read_unlock();
+ goto main_queue;
+ }
+ net = auditd_conn.net;
+ get_net(net);
+ sk = audit_get_sk(net);
+ portid = auditd_conn.portid;
+ rcu_read_unlock();
/* attempt to flush the hold queue */
- while (auditd && (skb = skb_dequeue(&audit_hold_queue))) {
- rc = kauditd_send_unicast_skb(skb);
- if (rc) {
- /* requeue to the same spot */
- skb_queue_head(&audit_hold_queue, skb);
-
- auditd = 0;
- if (AUDITD_BAD(rc, reschedule)) {
- mutex_lock(&audit_cmd_mutex);
- auditd_reset();
- mutex_unlock(&audit_cmd_mutex);
- reschedule = 0;
- }
- } else
- /* we were able to send successfully */
- reschedule = 0;
+ rc = kauditd_send_queue(sk, portid,
+ &audit_hold_queue, UNICAST_RETRIES,
+ NULL, kauditd_rehold_skb);
+ if (rc < 0) {
+ sk = NULL;
+ goto main_queue;
}
/* attempt to flush the retry queue */
- while (auditd && (skb = skb_dequeue(&audit_retry_queue))) {
- rc = kauditd_send_unicast_skb(skb);
- if (rc) {
- auditd = 0;
- if (AUDITD_BAD(rc, reschedule)) {
- kauditd_hold_skb(skb);
- mutex_lock(&audit_cmd_mutex);
- auditd_reset();
- mutex_unlock(&audit_cmd_mutex);
- reschedule = 0;
- } else
- /* temporary problem (we hope), queue
- * to the same spot and retry */
- skb_queue_head(&audit_retry_queue, skb);
- } else
- /* we were able to send successfully */
- reschedule = 0;
+ rc = kauditd_send_queue(sk, portid,
+ &audit_retry_queue, UNICAST_RETRIES,
+ NULL, kauditd_hold_skb);
+ if (rc < 0) {
+ sk = NULL;
+ goto main_queue;
}
- /* standard queue processing, try to be as quick as possible */
-quick_loop:
- skb = skb_dequeue(&audit_queue);
- if (skb) {
- /* setup the netlink header, see the comments in
- * kauditd_send_multicast_skb() for length quirks */
- nlh = nlmsg_hdr(skb);
- nlh->nlmsg_len = skb->len - NLMSG_HDRLEN;
-
- /* attempt to send to any multicast listeners */
- kauditd_send_multicast_skb(skb);
-
- /* attempt to send to auditd, queue on failure */
- if (auditd) {
- rc = kauditd_send_unicast_skb(skb);
- if (rc) {
- auditd = 0;
- if (AUDITD_BAD(rc, reschedule)) {
- mutex_lock(&audit_cmd_mutex);
- auditd_reset();
- mutex_unlock(&audit_cmd_mutex);
- reschedule = 0;
- }
-
- /* move to the retry queue */
- kauditd_retry_skb(skb);
- } else
- /* everything is working so go fast! */
- goto quick_loop;
- } else if (reschedule)
- /* we are currently having problems, move to
- * the retry queue */
- kauditd_retry_skb(skb);
- else
- /* dump the message via printk and hold it */
- kauditd_hold_skb(skb);
- } else {
- /* we have flushed the backlog so wake everyone */
- wake_up(&audit_backlog_wait);
-
- /* if everything is okay with auditd (if present), go
- * to sleep until there is something new in the queue
- * or we have a change in the connected auditd;
- * otherwise simply reschedule to give things a chance
- * to recover */
- if (reschedule) {
- set_current_state(TASK_INTERRUPTIBLE);
- schedule();
- } else
- wait_event_freezable(kauditd_wait,
- kauditd_wake_condition());
-
- /* update the auditd connection status */
- auditd = (audit_pid ? 1 : 0);
+main_queue:
+ /* process the main queue - do the multicast send and attempt
+ * unicast, dump failed record sends to the retry queue; if
+ * sk == NULL due to previous failures we will just do the
+ * multicast send and move the record to the retry queue */
+ kauditd_send_queue(sk, portid, &audit_queue, 1,
+ kauditd_send_multicast_skb,
+ kauditd_retry_skb);
+
+ /* drop our netns reference, no auditd sends past this line */
+ if (net) {
+ put_net(net);
+ net = NULL;
}
+ sk = NULL;
+
+ /* we have processed all the queues so wake everyone */
+ wake_up(&audit_backlog_wait);
+
+ /* NOTE: we want to wake up if there is anything on the queue,
+ * regardless of if an auditd is connected, as we need to
+ * do the multicast send and rotate records from the
+ * main queue to the retry/hold queues */
+ wait_event_freezable(kauditd_wait,
+ (skb_queue_len(&audit_queue) ? 1 : 0));
}
return 0;
@@ -678,17 +804,16 @@ int audit_send_list(void *_dest)
{
struct audit_netlink_list *dest = _dest;
struct sk_buff *skb;
- struct net *net = dest->net;
- struct audit_net *aunet = net_generic(net, audit_net_id);
+ struct sock *sk = audit_get_sk(dest->net);
/* wait for parent to finish and send an ACK */
mutex_lock(&audit_cmd_mutex);
mutex_unlock(&audit_cmd_mutex);
while ((skb = __skb_dequeue(&dest->q)) != NULL)
- netlink_unicast(aunet->nlsk, skb, dest->portid, 0);
+ netlink_unicast(sk, skb, dest->portid, 0);
- put_net(net);
+ put_net(dest->net);
kfree(dest);
return 0;
@@ -722,16 +847,15 @@ struct sk_buff *audit_make_reply(__u32 portid, int seq, int type, int done,
static int audit_send_reply_thread(void *arg)
{
struct audit_reply *reply = (struct audit_reply *)arg;
- struct net *net = reply->net;
- struct audit_net *aunet = net_generic(net, audit_net_id);
+ struct sock *sk = audit_get_sk(reply->net);
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(aunet->nlsk , reply->skb, reply->portid, 0);
- put_net(net);
+ netlink_unicast(sk, reply->skb, reply->portid, 0);
+ put_net(reply->net);
kfree(reply);
return 0;
}
@@ -949,12 +1073,12 @@ static int audit_set_feature(struct sk_buff *skb)
static int audit_replace(pid_t pid)
{
- struct sk_buff *skb = audit_make_reply(0, 0, AUDIT_REPLACE, 0, 0,
- &pid, sizeof(pid));
+ struct sk_buff *skb;
+ skb = audit_make_reply(0, 0, AUDIT_REPLACE, 0, 0, &pid, sizeof(pid));
if (!skb)
return -ENOMEM;
- return netlink_unicast(audit_sock, skb, audit_nlk_portid, 0);
+ return auditd_send_unicast_skb(skb);
}
static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
@@ -981,7 +1105,9 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
memset(&s, 0, sizeof(s));
s.enabled = audit_enabled;
s.failure = audit_failure;
- s.pid = audit_pid;
+ rcu_read_lock();
+ s.pid = auditd_conn.pid;
+ rcu_read_unlock();
s.rate_limit = audit_rate_limit;
s.backlog_limit = audit_backlog_limit;
s.lost = atomic_read(&audit_lost);
@@ -1014,30 +1140,44 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
* from the initial pid namespace, but something
* to keep in mind if this changes */
int new_pid = s.pid;
+ pid_t auditd_pid;
pid_t requesting_pid = task_tgid_vnr(current);
- if ((!new_pid) && (requesting_pid != audit_pid)) {
- audit_log_config_change("audit_pid", new_pid, audit_pid, 0);
+ /* test the auditd connection */
+ audit_replace(requesting_pid);
+
+ rcu_read_lock();
+ auditd_pid = auditd_conn.pid;
+ /* only the current auditd can unregister itself */
+ if ((!new_pid) && (requesting_pid != auditd_pid)) {
+ rcu_read_unlock();
+ audit_log_config_change("audit_pid", new_pid,
+ auditd_pid, 0);
return -EACCES;
}
- if (audit_pid && new_pid &&
- audit_replace(requesting_pid) != -ECONNREFUSED) {
- audit_log_config_change("audit_pid", new_pid, audit_pid, 0);
+ /* replacing a healthy auditd is not allowed */
+ if (auditd_pid && new_pid) {
+ rcu_read_unlock();
+ audit_log_config_change("audit_pid", new_pid,
+ auditd_pid, 0);
return -EEXIST;
}
+ rcu_read_unlock();
+
if (audit_enabled != AUDIT_OFF)
- audit_log_config_change("audit_pid", new_pid, audit_pid, 1);
+ audit_log_config_change("audit_pid", new_pid,
+ auditd_pid, 1);
+
if (new_pid) {
- if (audit_sock)
- sock_put(audit_sock);
- audit_pid = new_pid;
- audit_nlk_portid = NETLINK_CB(skb).portid;
- sock_hold(skb->sk);
- audit_sock = skb->sk;
- } else {
+ /* register a new auditd connection */
+ auditd_set(new_pid,
+ NETLINK_CB(skb).portid,
+ sock_net(NETLINK_CB(skb).sk));
+ /* try to process any backlog */
+ wake_up_interruptible(&kauditd_wait);
+ } else
+ /* unregister the auditd connection */
auditd_reset();
- }
- wake_up_interruptible(&kauditd_wait);
}
if (s.mask & AUDIT_STATUS_RATE_LIMIT) {
err = audit_set_rate_limit(s.rate_limit);
@@ -1090,7 +1230,6 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
if (err)
break;
}
- mutex_unlock(&audit_cmd_mutex);
audit_log_common_recv_msg(&ab, msg_type);
if (msg_type != AUDIT_USER_TTY)
audit_log_format(ab, " msg='%.*s'",
@@ -1108,7 +1247,6 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
}
audit_set_portid(ab, NETLINK_CB(skb).portid);
audit_log_end(ab);
- mutex_lock(&audit_cmd_mutex);
}
break;
case AUDIT_ADD_RULE:
@@ -1298,26 +1436,26 @@ static int __net_init audit_net_init(struct net *net)
struct audit_net *aunet = net_generic(net, audit_net_id);
- aunet->nlsk = netlink_kernel_create(net, NETLINK_AUDIT, &cfg);
- if (aunet->nlsk == NULL) {
+ aunet->sk = netlink_kernel_create(net, NETLINK_AUDIT, &cfg);
+ if (aunet->sk == NULL) {
audit_panic("cannot initialize netlink socket in namespace");
return -ENOMEM;
}
- aunet->nlsk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
+ aunet->sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
+
return 0;
}
static void __net_exit audit_net_exit(struct net *net)
{
struct audit_net *aunet = net_generic(net, audit_net_id);
- struct sock *sock = aunet->nlsk;
- mutex_lock(&audit_cmd_mutex);
- if (sock == audit_sock)
+
+ rcu_read_lock();
+ if (net == auditd_conn.net)
auditd_reset();
- mutex_unlock(&audit_cmd_mutex);
+ rcu_read_unlock();
- netlink_kernel_release(sock);
- aunet->nlsk = NULL;
+ netlink_kernel_release(aunet->sk);
}
static struct pernet_operations audit_net_ops __net_initdata = {
@@ -1335,20 +1473,24 @@ static int __init audit_init(void)
if (audit_initialized == AUDIT_DISABLED)
return 0;
- pr_info("initializing netlink subsys (%s)\n",
- audit_default ? "enabled" : "disabled");
- register_pernet_subsys(&audit_net_ops);
+ memset(&auditd_conn, 0, sizeof(auditd_conn));
+ spin_lock_init(&auditd_conn.lock);
skb_queue_head_init(&audit_queue);
skb_queue_head_init(&audit_retry_queue);
skb_queue_head_init(&audit_hold_queue);
- audit_initialized = AUDIT_INITIALIZED;
- audit_enabled = audit_default;
- audit_ever_enabled |= !!audit_default;
for (i = 0; i < AUDIT_INODE_BUCKETS; i++)
INIT_LIST_HEAD(&audit_inode_hash[i]);
+ pr_info("initializing netlink subsys (%s)\n",
+ audit_default ? "enabled" : "disabled");
+ register_pernet_subsys(&audit_net_ops);
+
+ audit_initialized = AUDIT_INITIALIZED;
+ audit_enabled = audit_default;
+ audit_ever_enabled |= !!audit_default;
+
kauditd_task = kthread_run(kauditd_thread, NULL, "kauditd");
if (IS_ERR(kauditd_task)) {
int err = PTR_ERR(kauditd_task);
@@ -1519,20 +1661,16 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
if (unlikely(!audit_filter(type, AUDIT_FILTER_TYPE)))
return NULL;
- /* don't ever fail/sleep on these two conditions:
+ /* NOTE: don't ever fail/sleep on these two conditions:
* 1. auditd generated record - since we need auditd to drain the
* queue; also, when we are checking for auditd, compare PIDs using
* task_tgid_vnr() since auditd_pid is set in audit_receive_msg()
* using a PID anchored in the caller's namespace
- * 2. audit command message - record types 1000 through 1099 inclusive
- * are command messages/records used to manage the kernel subsystem
- * and the audit userspace, blocking on these messages could cause
- * problems under load so don't do it (note: not all of these
- * command types are valid as record types, but it is quicker to
- * just check two ints than a series of ints in a if/switch stmt) */
- if (!((audit_pid && audit_pid == task_tgid_vnr(current)) ||
- (type >= 1000 && type <= 1099))) {
- long sleep_time = audit_backlog_wait_time;
+ * 2. generator holding the audit_cmd_mutex - we don't want to block
+ * while holding the mutex */
+ if (!(auditd_test_task(current) ||
+ (current == __mutex_owner(&audit_cmd_mutex)))) {
+ long stime = audit_backlog_wait_time;
while (audit_backlog_limit &&
(skb_queue_len(&audit_queue) > audit_backlog_limit)) {
@@ -1541,14 +1679,13 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
/* sleep if we are allowed and we haven't exhausted our
* backlog wait limit */
- if ((gfp_mask & __GFP_DIRECT_RECLAIM) &&
- (sleep_time > 0)) {
+ if (gfpflags_allow_blocking(gfp_mask) && (stime > 0)) {
DECLARE_WAITQUEUE(wait, current);
add_wait_queue_exclusive(&audit_backlog_wait,
&wait);
set_current_state(TASK_UNINTERRUPTIBLE);
- sleep_time = schedule_timeout(sleep_time);
+ stime = schedule_timeout(stime);
remove_wait_queue(&audit_backlog_wait, &wait);
} else {
if (audit_rate_check() && printk_ratelimit())
@@ -2127,15 +2264,27 @@ void audit_log_link_denied(const char *operation, const struct path *link)
*/
void audit_log_end(struct audit_buffer *ab)
{
+ struct sk_buff *skb;
+ struct nlmsghdr *nlh;
+
if (!ab)
return;
- if (!audit_rate_check()) {
- audit_log_lost("rate limit exceeded");
- } else {
- skb_queue_tail(&audit_queue, ab->skb);
- wake_up_interruptible(&kauditd_wait);
+
+ if (audit_rate_check()) {
+ skb = ab->skb;
ab->skb = NULL;
- }
+
+ /* setup the netlink header, see the comments in
+ * kauditd_send_multicast_skb() for length quirks */
+ nlh = nlmsg_hdr(skb);
+ nlh->nlmsg_len = skb->len - NLMSG_HDRLEN;
+
+ /* queue the netlink packet and poke the kauditd thread */
+ skb_queue_tail(&audit_queue, skb);
+ wake_up_interruptible(&kauditd_wait);
+ } else
+ audit_log_lost("rate limit exceeded");
+
audit_buffer_free(ab);
}
diff --git a/kernel/audit.h b/kernel/audit.h
index ca579880303a..0f1cf6d1878a 100644
--- a/kernel/audit.h
+++ b/kernel/audit.h
@@ -218,7 +218,7 @@ extern void audit_log_name(struct audit_context *context,
struct audit_names *n, const struct path *path,
int record_num, int *call_panic);
-extern int audit_pid;
+extern int auditd_test_task(const struct task_struct *task);
#define AUDIT_INODE_BUCKETS 32
extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
@@ -250,10 +250,6 @@ struct audit_netlink_list {
int audit_send_list(void *);
-struct audit_net {
- struct sock *nlsk;
-};
-
extern int selinux_audit_rule_update(void);
extern struct mutex audit_filter_mutex;
@@ -340,8 +336,7 @@ extern int audit_filter(int msgtype, unsigned int listtype);
extern int __audit_signal_info(int sig, struct task_struct *t);
static inline int audit_signal_info(int sig, struct task_struct *t)
{
- if (unlikely((audit_pid && t->tgid == audit_pid) ||
- (audit_signals && !audit_dummy_context())))
+ if (auditd_test_task(t) || (audit_signals && !audit_dummy_context()))
return __audit_signal_info(sig, t);
return 0;
}
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index d6a8de5f8fa3..e59ffc7fc522 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -762,7 +762,7 @@ static enum audit_state audit_filter_syscall(struct task_struct *tsk,
struct audit_entry *e;
enum audit_state state;
- if (audit_pid && tsk->tgid == audit_pid)
+ if (auditd_test_task(tsk))
return AUDIT_DISABLED;
rcu_read_lock();
@@ -816,7 +816,7 @@ void audit_filter_inodes(struct task_struct *tsk, struct audit_context *ctx)
{
struct audit_names *n;
- if (audit_pid && tsk->tgid == audit_pid)
+ if (auditd_test_task(tsk))
return;
rcu_read_lock();
@@ -2256,7 +2256,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
struct audit_context *ctx = tsk->audit_context;
kuid_t uid = current_uid(), t_uid = task_uid(t);
- if (audit_pid && t->tgid == audit_pid) {
+ if (auditd_test_task(t)) {
if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1 || sig == SIGUSR2) {
audit_sig_pid = task_tgid_nr(tsk);
if (uid_valid(tsk->loginuid))
7 years, 8 months
audit regressions in 4.11
by Seth Forshee
I've observed audit regressions in 4.11-rc when not using a userspace
audit daemon. The most obvious issue is that audit messages are not
appearing in dmesg anymore. If a sufficient number of audit messages are
generated the kernel will also start invoking the OOM killer.
It looks like previously, when there's no auditd in userspace kauditd
would call kauditd_hold_skb(), which prints the message using printk and
either frees the skb or queues it (with a limit on the number of queued
skb's by default).
Since 5b52330bbfe6 "audit: fix auditd/kernel connection state tracking"
when there's no auditd kauditd will instead use the retry queue, which
has no limit. But it will not process the retry queue when there's no
auditd, so messages pile up there indefinitely.
Thanks,
Seth
7 years, 8 months
[GIT PULL] Audit fixes for v4.11 (#2)
by Paul Moore
Hi Linus,
A week later than I had hoped, but as promised, here is the audit
uninline-fix we talked about during the last audit pull request. The
patch is slightly different than what we originally discussed as it
made more sense to keep the audit_signal_info() function in auditsc.c
rather than move it and bunch of other related variables/definitions
into audit.c/audit.h. At some point in the future I need to look at
how the audit code is organized across kernel/audit*, I suspect we
could do things a bit better, but it doesn't seem like a -rc release
is a good place for that ;)
Regardless, this patch passes our tests without problem and looks good
for v4.11, please merge.
Thanks,
-Paul
---
The following changes since commit 5b52330bbfe63b3305765354d6046c9f7f89c011:
audit: fix auditd/kernel connection state tracking (2017-03-21 11:26:35 -0400)
are available in the git repository at:
git://git.infradead.org/users/pcmoore/audit stable-4.11
for you to fetch changes up to ab6434a1377a768a1e6d3e6cf819eb21724a99c2:
audit: move audit_signal_info() into kernel/auditsc.c
(2017-03-27 14:30:06 -0400)
----------------------------------------------------------------
Paul Moore (1):
audit: move audit_signal_info() into kernel/auditsc.c
kernel/audit.h | 8 +-------
kernel/auditsc.c | 25 +++++++++++++------------
2 files changed, 14 insertions(+), 19 deletions(-)
--
paul moore
security @ redhat
7 years, 8 months
[RFC PATCH v2] audit: move audit_signal_info() into kernel/auditsc.c
by Paul Moore
From: Paul Moore <paul(a)paul-moore.com>
Commit 5b52330bbfe6 ("audit: fix auditd/kernel connection state
tracking") make inlining audit_signal_info() a bit pointless as
it was always calling into auditd_test_task() so let's remove the
inline function in kernel/audit.h and convert __audit_signal_info()
in kernel/auditsc.c into audit_signal_info().
Signed-off-by: Paul Moore <paul(a)paul-moore.com>
---
kernel/audit.h | 8 +-------
kernel/auditsc.c | 25 +++++++++++++------------
2 files changed, 14 insertions(+), 19 deletions(-)
diff --git a/kernel/audit.h b/kernel/audit.h
index 0f1cf6d1878a..0d87f8ab8778 100644
--- a/kernel/audit.h
+++ b/kernel/audit.h
@@ -333,13 +333,7 @@ extern u32 audit_sig_sid;
extern int audit_filter(int msgtype, unsigned int listtype);
#ifdef CONFIG_AUDITSYSCALL
-extern int __audit_signal_info(int sig, struct task_struct *t);
-static inline int audit_signal_info(int sig, struct task_struct *t)
-{
- if (auditd_test_task(t) || (audit_signals && !audit_dummy_context()))
- return __audit_signal_info(sig, t);
- return 0;
-}
+extern int audit_signal_info(int sig, struct task_struct *t);
extern void audit_filter_inodes(struct task_struct *, struct audit_context *);
extern struct list_head *audit_killed_trees(void);
#else
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index e59ffc7fc522..1c2333155893 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -2249,26 +2249,27 @@ void __audit_ptrace(struct task_struct *t)
* If the audit subsystem is being terminated, record the task (pid)
* and uid that is doing that.
*/
-int __audit_signal_info(int sig, struct task_struct *t)
+int audit_signal_info(int sig, struct task_struct *t)
{
struct audit_aux_data_pids *axp;
struct task_struct *tsk = current;
struct audit_context *ctx = tsk->audit_context;
kuid_t uid = current_uid(), t_uid = task_uid(t);
- if (auditd_test_task(t)) {
- if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1 || sig == SIGUSR2) {
- audit_sig_pid = task_tgid_nr(tsk);
- if (uid_valid(tsk->loginuid))
- audit_sig_uid = tsk->loginuid;
- else
- audit_sig_uid = uid;
- security_task_getsecid(tsk, &audit_sig_sid);
- }
- if (!audit_signals || audit_dummy_context())
- return 0;
+ if (auditd_test_task(t) &&
+ (sig == SIGTERM || sig == SIGHUP ||
+ sig == SIGUSR1 || sig == SIGUSR2)) {
+ audit_sig_pid = task_tgid_nr(tsk);
+ if (uid_valid(tsk->loginuid))
+ audit_sig_uid = tsk->loginuid;
+ else
+ audit_sig_uid = uid;
+ security_task_getsecid(tsk, &audit_sig_sid);
}
+ if (!audit_signals || audit_dummy_context())
+ return 0;
+
/* optimize the common case by putting first signal recipient directly
* in audit_context */
if (!ctx->target_pid) {
7 years, 8 months
[PATCH] prettify: standardize function declaration style
by Richard Guy Briggs
The start of audit_rule_interfield_comp_data was unfindable using vim
function-finding hotkeys.
Use Linux kernel-style function declaration brace style.
Signed-off-by: Richard Guy Briggs <rgb(a)redhat.com>
---
lib/libaudit.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/lib/libaudit.c b/lib/libaudit.c
index 7a082b5..002dd89 100644
--- a/lib/libaudit.c
+++ b/lib/libaudit.c
@@ -967,7 +967,8 @@ int audit_rule_syscallbyname_data(struct audit_rule_data *rule,
int audit_rule_interfield_comp_data(struct audit_rule_data **rulep,
const char *pair,
- int flags) {
+ int flags)
+{
const char *f = pair;
char *v;
int op;
--
1.7.1
7 years, 8 months
RHEL6 and RHEL7 audispatch configurations
by warron.french
Hi Steve, sorry for bugging you directly, nearly 1 year ago (May 10th to be
exact) we collaborated, for my benefit on how to configure audispatch on
"RHEL6" machines.
It seems that my instructions that I kept from 1 year ago are no longer
valid; there are new files in existence and some old ones no longer in
existence for both RHEL6 and RHEL7:
*[OLD]*
/etc/audisp/
*audisp-remote.conf,*
/etc/audisp/plugins.d/*au-remote.conf*
*[NEW]*
/etc/audisp/plugins.d/af_unix.conf
/etc/audisp/plugins.d/syslog.conf
Not sure how to find the appropriate man pages to configure this setup
properly. I am attaching what I wrote 1 year ago; and hope that you can
push me in the direction of a good walk-through for audispatch of the
modern revision (audit-2.4.5-3 on RHEL6, and audit-2.4.1-5.el7).
I have to stick with these revision for a little while since we are going
through a Project Management Stage gate, impacting update decisions.
--------------------------
Warron French
7 years, 8 months
