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author	Daniel Mack <zonque@gmail.com>	2013-09-22 10:50:02 -0400
committer	Vinod Koul <vinod.koul@intel.com>	2013-10-06 22:11:39 -0400
commit	717d818169e5d5672fb81bc7357e9bb265d1e228 (patch)
tree	47bb803d061ac4928170d373607f012f589720e4 /tools/perf/scripts/python/sctop.py
parent	b46ce4d01e1c6052809b13340cc8e62d361f7306 (diff)

dma: cppi41: add shortcut to &pdev->dev in cppi41_dma_probe()

Makes the code more readable and compact. No functional change. Signed-off-by: Daniel Mack <zonque@gmail.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>

Diffstat (limited to 'tools/perf/scripts/python/sctop.py')

0 files changed, 0 insertions, 0 deletions

W. Biederman <ebiederm@xmission.com> 2012-09-17 20:38:42 -0400 audit: Limit audit requests to processes in the initial pid and user namespaces.' href='/cgit/cgit.cgi/litmus-rt-edfsc.git/commit/kernel/audit.c?id=34e36d8ecbd958bc15f8e63deade1227de337eb1'>34e36d8ecbd9

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/* audit.c -- Auditing support
 * Gateway between the kernel (e.g., selinux) and the user-space audit daemon.
 * System-call specific features have moved to auditsc.c
 *
 * Copyright 2003-2007 Red Hat Inc., Durham, North Carolina.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Written by Rickard E. (Rik) Faith <faith@redhat.com>
 *
 * Goals: 1) Integrate fully with Security Modules.
 *	  2) Minimal run-time overhead:
 *	     a) Minimal when syscall auditing is disabled (audit_enable=0).
 *	     b) Small when syscall auditing is enabled and no audit record
 *		is generated (defer as much work as possible to record
 *		generation time):
 *		i) context is allocated,
 *		ii) names from getname are stored without a copy, and
 *		iii) inode information stored from path_lookup.
 *	  3) Ability to disable syscall auditing at boot time (audit=0).
 *	  4) Usable by other parts of the kernel (if audit_log* is called,
 *	     then a syscall record will be generated automatically for the
 *	     current syscall).
 *	  5) Netlink interface to user-space.
 *	  6) Support low-overhead kernel-based filtering to minimize the
 *	     information that must be passed to user-space.
 *
 * Example user-space utilities: http://people.redhat.com/sgrubb/audit/
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/file.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/atomic.h>
#include <linux/mm.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/kthread.h>
#include <linux/kernel.h>
#include <linux/syscalls.h>

#include <linux/audit.h>

#include <net/sock.h>
#include <net/netlink.h>
#include <linux/skbuff.h>
#ifdef CONFIG_SECURITY
#include <linux/security.h>
#endif
#include <linux/freezer.h>
#include <linux/pid_namespace.h>
#include <net/netns/generic.h>

#include "audit.h"

/* No auditing will take place until audit_initialized == AUDIT_INITIALIZED.
 * (Initialization happens after skb_init is called.) */
#define AUDIT_DISABLED		-1
#define AUDIT_UNINITIALIZED	0
#define AUDIT_INITIALIZED	1
static int	audit_initialized;

#define AUDIT_OFF	0
#define AUDIT_ON	1
#define AUDIT_LOCKED	2
u32		audit_enabled;
u32		audit_ever_enabled;

EXPORT_SYMBOL_GPL(audit_enabled);

/* Default state when kernel boots without any parameters. */
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.
 */
int		audit_pid;
static __u32	audit_nlk_portid;

/* 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
 * audit records being dropped. */
static u32	audit_rate_limit;

/* Number of outstanding audit_buffers allowed.
 * When set to zero, this means unlimited. */
static u32	audit_backlog_limit = 64;
#define AUDIT_BACKLOG_WAIT_TIME (60 * HZ)
static u32	audit_backlog_wait_time_master = AUDIT_BACKLOG_WAIT_TIME;
static u32	audit_backlog_wait_time = AUDIT_BACKLOG_WAIT_TIME;

/* The identity of the user shutting down the audit system. */
kuid_t		audit_sig_uid = INVALID_UID;
pid_t		audit_sig_pid = -1;
u32		audit_sig_sid = 0;

/* Records can be lost in several ways:
   0) [suppressed in audit_alloc]
   1) out of memory in audit_log_start [kmalloc of struct audit_buffer]
   2) out of memory in audit_log_move [alloc_skb]
   3) suppressed due to audit_rate_limit
   4) suppressed due to audit_backlog_limit
*/
static atomic_t    audit_lost = ATOMIC_INIT(0);

/* The netlink socket. */
static struct sock *audit_sock;
static int audit_net_id;

/* Hash for inode-based rules */
struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];

/* The audit_freelist is a list of pre-allocated audit buffers (if more
 * than AUDIT_MAXFREE are in use, the audit buffer is freed instead of
 * being placed on the freelist). */
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;
static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait);
static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait);

static struct audit_features af = {.vers = AUDIT_FEATURE_VERSION,
				   .mask = -1,
				   .features = 0,
				   .lock = 0,};

static char *audit_feature_names[2] = {
	"only_unset_loginuid",
	"loginuid_immutable",
};


/* Serialize requests from userspace. */
DEFINE_MUTEX(audit_cmd_mutex);

/* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting
 * audit records.  Since printk uses a 1024 byte buffer, this buffer
 * should be at least that large. */
#define AUDIT_BUFSIZ 1024

/* AUDIT_MAXFREE is the number of empty audit_buffers we keep on the
 * audit_freelist.  Doing so eliminates many kmalloc/kfree calls. */
#define AUDIT_MAXFREE  (2*NR_CPUS)

/* The audit_buffer is used when formatting an audit record.  The caller
 * locks briefly to get the record off the freelist or to allocate the
 * buffer, and locks briefly to send the buffer to the netlink layer or
 * to place it on a transmit queue.  Multiple audit_buffers can be in
 * use simultaneously. */
struct audit_buffer {
	struct list_head     list;
	struct sk_buff       *skb;	/* formatted skb ready to send */
	struct audit_context *ctx;	/* NULL or associated context */
	gfp_t		     gfp_mask;
};

struct audit_reply {
	__u32 portid;
	struct net *net;
	struct sk_buff *skb;
};

static void audit_set_portid(struct audit_buffer *ab, __u32 portid)
{
	if (ab) {
		struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
		nlh->nlmsg_pid = portid;
	}
}

void audit_panic(const char *message)
{
	switch (audit_failure) {
	case AUDIT_FAIL_SILENT:
		break;
	case AUDIT_FAIL_PRINTK:
		if (printk_ratelimit())
			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);
		break;
	}
}

static inline int audit_rate_check(void)
{
	static unsigned long	last_check = 0;
	static int		messages   = 0;
	static DEFINE_SPINLOCK(lock);
	unsigned long		flags;
	unsigned long		now;
	unsigned long		elapsed;
	int			retval	   = 0;

	if (!audit_rate_limit) return 1;

	spin_lock_irqsave(&lock, flags);
	if (++messages < audit_rate_limit) {
		retval = 1;
	} else {
		now     = jiffies;
		elapsed = now - last_check;
		if (elapsed > HZ) {
			last_check = now;
			messages   = 0;
			retval     = 1;
		}
	}
	spin_unlock_irqrestore(&lock, flags);

	return retval;
}

/**
 * audit_log_lost - conditionally log lost audit message event
 * @message: the message stating reason for lost audit message
 *
 * Emit at least 1 message per second, even if audit_rate_check is
 * throttling.
 * Always increment the lost messages counter.
*/
void audit_log_lost(const char *message)
{
	static unsigned long	last_msg = 0;
	static DEFINE_SPINLOCK(lock);
	unsigned long		flags;
	unsigned long		now;
	int			print;

	atomic_inc(&audit_lost);

	print = (audit_failure == AUDIT_FAIL_PANIC || !audit_rate_limit);

	if (!print) {
		spin_lock_irqsave(&lock, flags);
		now = jiffies;
		if (now - last_msg > HZ) {
			print = 1;
			last_msg = now;
		}
		spin_unlock_irqrestore(&lock, flags);
	}

	if (print) {
		if (printk_ratelimit())
			pr_warn("audit_lost=%u audit_rate_limit=%u audit_backlog_limit=%u\n",
				atomic_read(&audit_lost),
				audit_rate_limit,
				audit_backlog_limit);
		audit_panic(message);
	}
}

static int audit_log_config_change(char *function_name, u32 new, u32 old,
				   int allow_changes)
{
	struct audit_buffer *ab;
	int rc = 0;

	ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
	if (unlikely(!ab))
		return rc;
	audit_log_format(ab, "%s=%u old=%u", function_name, new, old);
	audit_log_session_info(ab);
	rc = audit_log_task_context(ab);
	if (rc)
		allow_changes = 0; /* Something weird, deny request */
	audit_log_format(ab, " res=%d", allow_changes);
	audit_log_end(ab);
	return rc;
}

static int audit_do_config_change(char *function_name, u32 *to_change, u32 new)
{
	int allow_changes, rc = 0;
	u32 old = *to_change;

	/* check if we are locked */
	if (audit_enabled == AUDIT_LOCKED)
		allow_changes = 0;
	else
		allow_changes = 1;

	if (audit_enabled != AUDIT_OFF) {
		rc = audit_log_config_change(function_name, new, old, allow_changes);
		if (rc)
			allow_changes = 0;
	}

	/* If we are allowed, make the change */
	if (allow_changes == 1)
		*to_change = new;
	/* Not allowed, update reason */
	else if (rc == 0)
		rc = -EPERM;
	return rc;
}

static int audit_set_rate_limit(u32 limit)
{
	return audit_do_config_change("audit_rate_limit", &audit_rate_limit, limit);
}

static int audit_set_backlog_limit(u32 limit)
{
	return audit_do_config_change("audit_backlog_limit", &audit_backlog_limit, limit);
}

static int audit_set_backlog_wait_time(u32 timeout)
{
	return audit_do_config_change("audit_backlog_wait_time",
				      &audit_backlog_wait_time_master, timeout);
}

static int audit_set_enabled(u32 state)
{
	int rc;
	if (state > AUDIT_LOCKED)
		return -EINVAL;

	rc =  audit_do_config_change("audit_enabled", &audit_enabled, state);
	if (!rc)
		audit_ever_enabled |= !!state;

	return rc;
}

static int audit_set_failure(u32 state)
{
	if (state != AUDIT_FAIL_SILENT
	    && state != AUDIT_FAIL_PRINTK
	    && state != AUDIT_FAIL_PANIC)
		return -EINVAL;

	return audit_do_config_change("audit_failure", &audit_failure, state);
}

/*
 * 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 &&
	    (!audit_backlog_limit ||
	     skb_queue_len(&audit_skb_hold_queue) < audit_backlog_limit))
		skb_queue_tail(&audit_skb_hold_queue, skb);
	else
		kfree_skb(skb);
}

/*
 * For one reason or another this nlh isn't getting delivered to the userspace
 * audit daemon, just send it to printk.
 */
static void audit_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");
	}

	audit_hold_skb(skb);
}

static void kauditd_send_skb(struct sk_buff *skb)
{
	int err;
	int attempts = 0;
#define AUDITD_RETRIES 5

restart:
	/* 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_portid, 0);
	if (err < 0) {
		pr_err("netlink_unicast sending to audit_pid=%d returned error: %d\n",
		       audit_pid, err);
		if (audit_pid) {
			if (err == -ECONNREFUSED || err == -EPERM
			    || ++attempts >= AUDITD_RETRIES) {
				char s[32];

				snprintf(s, sizeof(s), "audit_pid=%d reset", audit_pid);
				audit_log_lost(s);
				audit_pid = 0;
				audit_sock = NULL;
			} else {
				pr_warn("re-scheduling(#%d) write to audit_pid=%d\n",
					attempts, audit_pid);
				set_current_state(TASK_INTERRUPTIBLE);
				schedule();
				goto restart;
			}
		}
		/* we might get lucky and get this in the next auditd */
		audit_hold_skb(skb);
	} else
		/* drop the extra reference if sent ok */
		consume_skb(skb);
}

/*
 * kauditd_send_multicast_skb - send the skb to multicast userspace listeners
 *
 * 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, gfp_t gfp_mask)
{
	struct sk_buff		*copy;
	struct audit_net	*aunet = net_generic(&init_net, audit_net_id);
	struct sock		*sock = aunet->nlsk;

	if (!netlink_has_listeners(sock, AUDIT_NLGRP_READLOG))
		return;

	/*
	 * The seemingly wasteful skb_copy() rather than bumping the refcount
	 * using skb_get() is necessary because non-standard mods are made to
	 * the skb by the original kaudit unicast socket send routine.  The
	 * existing auditd daemon assumes this breakage.  Fixing this would
	 * require co-ordinating a change in the established protocol between
	 * the kaudit kernel subsystem and the auditd userspace code.  There is
	 * no reason for new multicast clients to continue with this
	 * non-compliance.
	 */
	copy = skb_copy(skb, gfp_mask);
	if (!copy)
		return;

	nlmsg_multicast(sock, copy, 0, AUDIT_NLGRP_READLOG, gfp_mask);
}

/*
 * flush_hold_queue - empty the hold queue if auditd appears
 *
 * 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.
 */
static void flush_hold_queue(void)
{
	struct sk_buff *skb;

	if (!audit_default || !audit_pid)
		return;

	skb = skb_dequeue(&audit_skb_hold_queue);
	if (likely(!skb))
		return;

	while (skb && audit_pid) {
		kauditd_send_skb(skb);
		skb = skb_dequeue(&audit_skb_hold_queue);
	}

	/*
	 * if auditd just disappeared but we
	 * dequeued an skb we need to drop ref
	 */
	consume_skb(skb);
}

static int kauditd_thread(void *dummy)
{
	set_freezable();
	while (!kthread_should_stop()) {
		struct sk_buff *skb;

		flush_hold_queue();

		skb = skb_dequeue(&audit_skb_queue);

		if (skb) {
			if (!audit_backlog_limit ||
			    (skb_queue_len(&audit_skb_queue) <= audit_backlog_limit))
				wake_up(&audit_backlog_wait);
			if (audit_pid)
				kauditd_send_skb(skb);
			else
				audit_printk_skb(skb);
			continue;
		}

		wait_event_freezable(kauditd_wait, skb_queue_len(&audit_skb_queue));
	}
	return 0;
}

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);

	/* 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);

	put_net(net);
	kfree(dest);

	return 0;
}

struct sk_buff *audit_make_reply(__u32 portid, int seq, int type, int done,


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