cregit-Linux how code gets into the kernel

Release 4.7 kernel/audit.c

Directory: kernel
/* 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; } }

Contributors

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steve grubbsteve grubb2565.79%125.00%
eric pariseric paris615.79%125.00%
richard guy briggsrichard guy briggs410.53%125.00%
arnaldo carvalho de meloarnaldo carvalho de melo37.89%125.00%
Total38100.00%4100.00%


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; } }

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PersonTokensPropCommitsCommitProp
andrew mortonandrew morton3873.08%120.00%
eric pariseric paris1019.23%240.00%
chris wrightchris wright23.85%120.00%
joe perchesjoe perches23.85%120.00%
Total52100.00%5100.00%


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; }

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andrew mortonandrew morton11496.61%150.00%
thomas gleixnerthomas gleixner43.39%150.00%
Total118100.00%2100.00%

/** * 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); } }

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andrew mortonandrew morton11691.34%120.00%
eric pariseric paris53.94%120.00%
thomas gleixnerthomas gleixner43.15%120.00%
joe perchesjoe perches21.57%240.00%
Total127100.00%5100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
eric pariseric paris5856.86%327.27%
steve grubbsteve grubb1413.73%218.18%
andrew mortonandrew morton1211.76%19.09%
kees cookkees cook1110.78%19.09%
joe perchesjoe perches32.94%19.09%
serge hallynserge hallyn21.96%19.09%
adrian bunkadrian bunk10.98%19.09%
eric w. biedermaneric w. biederman10.98%19.09%
Total102100.00%11100.00%


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; }

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PersonTokensPropCommitsCommitProp
steve grubbsteve grubb5452.43%228.57%
eric pariseric paris3130.10%114.29%
andrew mortonandrew morton1211.65%114.29%
joe perchesjoe perches43.88%114.29%
adrian bunkadrian bunk10.97%114.29%
serge hallynserge hallyn10.97%114.29%
Total103100.00%7100.00%


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

Contributors

PersonTokensPropCommitsCommitProp
eric pariseric paris735.00%116.67%
steve grubbsteve grubb630.00%233.33%
andrew mortonandrew morton525.00%116.67%
adrian bunkadrian bunk15.00%116.67%
joe perchesjoe perches15.00%116.67%
Total20100.00%6100.00%


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

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eric pariseric paris1680.00%133.33%
andrew mortonandrew morton315.00%133.33%
joe perchesjoe perches15.00%133.33%
Total20100.00%3100.00%


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

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richard guy briggsrichard guy briggs1995.00%266.67%
joe perchesjoe perches15.00%133.33%
Total20100.00%3100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
eric pariseric paris4083.33%233.33%
steve grubbsteve grubb510.42%233.33%
andrew mortonandrew morton24.17%116.67%
joe perchesjoe perches12.08%116.67%
Total48100.00%6100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
andrew mortonandrew morton2873.68%120.00%
eric pariseric paris410.53%120.00%
steve grubbsteve grubb410.53%120.00%
joe perchesjoe perches12.63%120.00%
adrian bunkadrian bunk12.63%120.00%
Total38100.00%5100.00%

/* * 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); }

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PersonTokensPropCommitsCommitProp
eric pariseric paris2252.38%120.00%
david woodhousedavid woodhouse1433.33%240.00%
richard guy briggsrichard guy briggs511.90%120.00%
adrian bunkadrian bunk12.38%120.00%
Total42100.00%5100.00%

/* * 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); }

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eric pariseric paris6495.52%125.00%
david s. millerdavid s. miller11.49%125.00%
joe perchesjoe perches11.49%125.00%
josh boyerjosh boyer11.49%125.00%
Total67100.00%4100.00%


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); }

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richard guy briggsrichard guy briggs8454.19%337.50%
david woodhousedavid woodhouse3522.58%112.50%
eric pariseric paris3421.94%225.00%
eric w. biedermaneric w. biederman10.65%112.50%
neil hormanneil horman10.65%112.50%
Total155100.00%8100.00%

/* * 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); }

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richard guy briggsrichard guy briggs81100.00%3100.00%
Total81100.00%3100.00%

/* * 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); }

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eric pariseric paris5177.27%150.00%
richard guy briggsrichard guy briggs1522.73%150.00%
Total66100.00%2100.00%


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; }

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richard guy briggsrichard guy briggs3335.11%333.33%
eric pariseric paris2425.53%222.22%
david woodhousedavid woodhouse1819.15%111.11%
dan duvaldan duval1515.96%111.11%
andrew mortonandrew morton33.19%111.11%
peter zijlstrapeter zijlstra11.06%111.11%
Total94100.00%9100.00%


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; }

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al viroal viro6666.67%116.67%
richard guy briggsrichard guy briggs2424.24%233.33%
eric w. biedermaneric w. biederman66.06%116.67%
amy griffisamy griffis22.02%116.67%
andrew mortonandrew morton11.01%116.67%
Total99100.00%6100.00%


struct sk_buff *audit_make_reply(__u32 portid, int seq, int type, int done, int multi, const void *payload, int size) { struct sk_buff *skb; struct nlmsghdr *nlh; void *data; int flags = multi ? NLM_F_MULTI : 0; int t = done ? NLMSG_DONE : type; skb = nlmsg_new(size, GFP_KERNEL); if (!skb) return NULL; nlh = nlmsg_put(skb, portid, seq, t, size, flags); if (!nlh) goto out_kfree_skb; data = nlmsg_data(nlh); memcpy(data, payload, size); return skb; out_kfree_skb: kfree_skb(skb); return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
andrew mortonandrew morton9571.43%114.29%
al viroal viro1813.53%114.29%
david s. millerdavid s. miller118.27%114.29%
eric pariseric paris43.01%114.29%
richard guy briggsrichard guy briggs32.26%114.29%
david woodhousedavid woodhouse10.75%114.29%
stephen hemmingerstephen hemminger10.75%114.29%
Total133100.00%7100.00%


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); 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); kfree(reply); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
eric pariseric paris5665.12%125.00%
richard guy briggsrichard guy briggs2427.91%250.00%
eric w. biedermaneric w. biederman66.98%125.00%
Total86100.00%4100.00%

/** * audit_send_reply - send an audit reply message via netlink * @request_skb: skb of request we are replying to (used to target the reply) * @seq: sequence number * @type: audit message type * @done: done (last) flag * @multi: multi-part message flag * @payload: payload data * @size: payload size * * Allocates an skb, builds the netlink message, and sends it to the port id. * No failure notifications. */
static void audit_send_reply(struct sk_buff *request_skb, int seq, int type, int done, int multi, const void *payload, int size) { u32 portid = NETLINK_CB(request_skb).portid; struct net *net = sock_net(NETLINK_CB(request_skb).sk); 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(portid, seq, type, done, multi, payload, size); if (!skb) goto out; reply->net = get_net(net); reply->portid = portid; reply->skb = skb; tsk = kthread_run(audit_send_reply_thread, reply, "audit_send_reply"); if (!IS_ERR(tsk)) return; kfree_skb(skb); out: kfree(reply); }

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eric pariseric paris5733.93%111.11%
al viroal viro4727.98%111.11%
eric w. biedermaneric w. biederman3621.43%222.22%
andrew mortonandrew morton2112.50%222.22%
richard guy briggsrichard guy briggs52.98%222.22%
stephen hemmingerstephen hemminger21.19%111.11%
Total168100.00%9100.00%

/* * Check for appropriate CAP_AUDIT_ capabilities on incoming audit * control messages. */
static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type) { int err = 0; /* Only support initial user namespace for now. */ /* * We return ECONNREFUSED because it tricks userspace into thinking * that audit was not configured into the kernel. Lots of users * configure their PAM stack (because that's what the distro does) * to reject login if unable to send messages to audit. If we return * ECONNREFUSED the PAM stack thinks the kernel does not have audit * configured in and will let login proceed. If we return EPERM * userspace will reject all logins. This should be removed when we * support non init namespaces!! */ if (current_user_ns() != &init_user_ns) return -ECONNREFUSED; switch (msg_type) { case AUDIT_LIST: case AUDIT_ADD: case AUDIT_DEL: return -EOPNOTSUPP; case AUDIT_GET: case AUDIT_SET: case AUDIT_GET_FEATURE: case AUDIT_SET_FEATURE: case AUDIT_LIST_RULES: case AUDIT_ADD_RULE: case AUDIT_DEL_RULE: case AUDIT_SIGNAL_INFO: case AUDIT_TTY_GET: case AUDIT_TTY_SET: case AUDIT_TRIM: case AUDIT_MAKE_EQUIV: /* Only support auditd and auditctl in initial pid namespace * for now. */ if (task_active_pid_ns(current) != &init_pid_ns) return -EPERM; if (!netlink_capable(skb, CAP_AUDIT_CONTROL)) err = -EPERM; break; case AUDIT_USER: case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG: case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2: if (!netlink_capable(skb, CAP_AUDIT_WRITE)) err = -EPERM; break; default: /* bad msg */ err = -EINVAL; } return err; }

Contributors

PersonTokensPropCommitsCommitProp
serge hallynserge hallyn6641.77%15.88%
eric pariseric paris2113.29%423.53%
eric w. biedermaneric w. biederman1710.76%211.76%
richard guy briggsrichard guy briggs1610.13%15.88%
steve grubbsteve grubb127.59%423.53%
amy griffisamy griffis74.43%15.88%
al viroal viro63.80%15.88%
miloslav trmacmiloslav trmac63.80%15.88%
darrel goeddeldarrel goeddel42.53%15.88%
david woodhousedavid woodhouse31.90%15.88%
Total158100.00%17100.00%


static void audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type) { uid_t uid = from_kuid(&init_user_ns, current_uid()); pid_t pid = task_tgid_nr(current); if (!audit_enabled && msg_type != AUDIT_USER_AVC) { *ab = NULL; return; } *ab = audit_log_start(NULL, GFP_KERNEL, msg_type); if (unlikely(!*ab)) return; audit_log_format(*ab, "pid=%d uid=%u", pid, uid); audit_log_session_info(*ab); audit_log_task_context(*ab); }

Contributors

PersonTokensPropCommitsCommitProp
eric pariseric paris7273.47%444.44%
richard guy briggsrichard guy briggs99.18%111.11%
kees cookkees cook99.18%111.11%
tyler hickstyler hicks44.08%111.11%
paul moorepaul moore33.06%111.11%
eric w. biedermaneric w. biederman11.02%111.11%
Total98100.00%9100.00%


int is_audit_feature_set(int i) { return af.features & AUDIT_FEATURE_TO_MASK(i); }

Contributors

PersonTokensPropCommitsCommitProp
eric pariseric paris18100.00%1100.00%
Total18100.00%1100.00%


static int audit_get_feature(struct sk_buff *skb) { u32 seq; seq = nlmsg_hdr(skb)->nlmsg_seq; audit_send_reply(skb, seq, AUDIT_GET_FEATURE, 0, 0, &af, sizeof(af)); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
eric pariseric paris4697.87%150.00%
richard guy briggsrichard guy briggs12.13%150.00%
Total47100.00%2100.00%


static void audit_log_feature_change(int which, u32 old_feature, u32 new_feature, u32 old_lock, u32 new_lock, int res) { struct audit_buffer *ab; if (audit_enabled == AUDIT_OFF) return; ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_FEATURE_CHANGE); audit_log_task_info(ab, current); audit_log_format(ab, " feature=%s old=%u new=%u old_lock=%u new_lock=%u res=%d", audit_feature_names[which], !!old_feature, !!new_feature, !!old_lock, !!new_lock, res); audit_log_end(ab); }

Contributors

PersonTokensPropCommitsCommitProp
eric pariseric paris7483.15%125.00%
richard guy briggsrichard guy briggs88.99%250.00%
gao fenggao feng77.87%125.00%
Total89100.00%4100.00%


static int audit_set_feature(struct sk_buff *skb) { struct audit_features *uaf; int i; BUILD_BUG_ON(AUDIT_LAST_FEATURE + 1 > ARRAY_SIZE(audit_feature_names)); uaf = nlmsg_data(nlmsg_hdr(skb)); /* if there is ever a version 2 we should handle that here */ for (i = 0; i <= AUDIT_LAST_FEATURE; i++) { u32 feature = AUDIT_FEATURE_TO_MASK(i); u32 old_feature, new_feature, old_lock, new_lock; /* if we are not changing this feature, move along */ if (!(feature & uaf->mask)) continue; old_feature = af.features & feature; new_feature = uaf->features & feature; new_lock = (uaf->lock | af.lock) & feature; old_lock = af.lock & feature; /* are we changing a locked feature? */ if (old_lock && (new_feature != old_feature)) { audit_log_feature_change(i, old_feature, new_feature, old_lock, new_lock, 0); return -EPERM; } } /* nothing invalid, do the changes */ for (i = 0; i <= AUDIT_LAST_FEATURE; i++) { u32 feature = AUDIT_FEATURE_TO_MASK(i); u32 old_feature, new_feature, old_lock, new_lock; /* if we are not changing this feature, move along */ if (!(feature & uaf->mask)) continue; old_feature = af.features & feature; new_feature = uaf->features & feature; old_lock = af.lock & feature; new_lock = (uaf->lock | af.lock) & feature; if (new_feature != old_feature) audit_log_feature_change(i, old_feature, new_feature, old_lock, new_lock, 1); if (new_feature) af.features |= feature; else af.features &= ~feature; af.lock |= new_lock; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
eric pariseric paris28799.31%133.33%
gao fenggao feng10.35%133.33%
fabian frederickfabian frederick10.35%133.33%
Total289100.00%3100.00%


static int audit_replace(pid_t pid) { struct sk_buff *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); }

Contributors

PersonTokensPropCommitsCommitProp
richard guy briggsrichard guy briggs56100.00%1100.00%
Total56100.00%1100.00%


static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) { u32 seq; void *data; int err; struct audit_buffer *ab; u16 msg_type = nlh->nlmsg_type; struct audit_sig_info *sig_data; char *ctx = NULL; u32 len; err = audit_netlink_ok(skb, msg_type); if (err) return err; /* As soon as there's any sign of userspace auditd, * start kauditd to talk to it */ if (!kauditd_task) { kauditd_task = kthread_run(kauditd_thread, NULL, "kauditd"); if (IS_ERR(kauditd_task)) { err = PTR_ERR(kauditd_task); kauditd_task = NULL; return err; } } seq = nlh->nlmsg_seq; data = nlmsg_data(nlh); switch (msg_type) { case AUDIT_GET: { struct audit_status s; memset(&s, 0, sizeof(s)); s.enabled = audit_enabled; s.failure = audit_failure; s.pid = audit_pid; s.rate_limit = audit_rate_limit; s.backlog_limit = audit_backlog_limit; s.lost = atomic_read(&audit_lost); s.backlog = skb_queue_len(&audit_skb_queue); s.feature_bitmap = AUDIT_FEATURE_BITMAP_ALL; s.backlog_wait_time = audit_backlog_wait_time_master; audit_send_reply(skb, seq, AUDIT_GET, 0, 0, &s, sizeof(s)); break; } case AUDIT_SET: { struct audit_status s; memset(&s, 0, sizeof(s)); /* guard against past and future API changes */ memcpy(&s, data, min_t(size_t, sizeof(s), nlmsg_len(nlh))); if (s.mask & AUDIT_STATUS_ENABLED) { err = audit_set_enabled(s.enabled); if (err < 0) return err; } if (s.mask & AUDIT_STATUS_FAILURE) { err = audit_set_failure(s.failure); if (err < 0) return err; } if (s.mask & AUDIT_STATUS_PID) { int new_pid = s.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); return -EACCES; } if (audit_pid && new_pid && audit_replace(requesting_pid) != -ECONNREFUSED) { audit_log_config_change("audit_pid", new_pid, audit_pid, 0); return -EEXIST; } if (audit_enabled != AUDIT_OFF) audit_log_config_change("audit_pid", new_pid, audit_pid, 1); audit_pid = new_pid; audit_nlk_portid = NETLINK_CB(skb).portid; audit_sock = skb->sk; } if (s.mask & AUDIT_STATUS_RATE_LIMIT) { err = audit_set_rate_limit(s.rate_limit); if (err < 0) return err; } if (s.mask & AUDIT_STATUS_BACKLOG_LIMIT) { err = audit_set_backlog_limit(s.backlog_limit); if (err < 0) return err; } if (s.mask & AUDIT_STATUS_BACKLOG_WAIT_TIME) { if (sizeof(s) > (size_t)nlh->nlmsg_len) return -EINVAL; if (s.backlog_wait_time > 10*AUDIT_BACKLOG_WAIT_TIME) return -EINVAL; err = audit_set_backlog_wait_time(s.backlog_wait_time); if (err < 0) return err; } break; } case AUDIT_GET_FEATURE: err = audit_get_feature(skb); if (err) return err; break; case AUDIT_SET_FEATURE: err = audit_set_feature(skb); if (err) return err; break; case AUDIT_USER: case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG: case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2: if (!audit_enabled && msg_type != AUDIT_USER_AVC) return 0; err = audit_filter_user(msg_type); if (err == 1) { /* match or error */ err = 0; if (msg_type == AUDIT_USER_TTY) { err = tty_audit_push(); 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'", AUDIT_MESSAGE_TEXT_MAX, (char *)data); else { int size; audit_log_format(ab, " data="); size = nlmsg_len(nlh); if (size > 0 && ((unsigned char *)data)[size - 1] == '\0') size--; audit_log_n_untrustedstring(ab, data, size); } audit_set_portid(ab, NETLINK_CB(skb).portid); audit_log_end(ab); mutex_lock(&audit_cmd_mutex); } break; case AUDIT_ADD_RULE: case AUDIT_DEL_RULE: if (nlmsg_len(nlh) < sizeof(struct audit_rule_data)) return -EINVAL; if (audit_enabled == AUDIT_LOCKED) { audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE); audit_log_format(ab, " audit_enabled=%d res=0", audit_enabled); audit_log_end(ab); return -EPERM; } err = audit_rule_change(msg_type, NETLINK_CB(skb).portid, seq, data, nlmsg_len(nlh)); break; case AUDIT_LIST_RULES: err = audit_list_rules_send(skb, seq); break; case AUDIT_TRIM: audit_trim_trees(); audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE); audit_log_format(ab, " op=trim res=1"); audit_log_end(ab); break; case AUDIT_MAKE_EQUIV: { void *bufp = data; u32 sizes[2]; size_t msglen = nlmsg_len(nlh); char *old, *new; err = -EINVAL; if (msglen < 2 * sizeof(u32)) break; memcpy(sizes, bufp, 2 * sizeof(u32)); bufp += 2 * sizeof(u32); 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, &msglen, sizes[1]); if (IS_ERR(new)) { err = PTR_ERR(new); kfree(old); break; } /* OK, here comes... */ err = audit_tag_tree(old, new); audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE); audit_log_format(ab, " op=make_equiv old="); audit_log_untrustedstring(ab, old); audit_log_format(ab, " new="); audit_log_untrustedstring(ab, new); audit_log_format(ab, " res=%d", !err); audit_log_end(ab); kfree(old); kfree(new); break; } case AUDIT_SIGNAL_INFO: len = 0; if (audit_sig_sid) { err = security_secid_to_secctx(audit_sig_sid, &ctx, &len); if (err) return err; } sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL); if (!sig_data) { if (audit_sig_sid) security_release_secctx(ctx, len); return -ENOMEM; } sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid); sig_data->pid = audit_sig_pid; if (audit_sig_sid) { memcpy(sig_data->ctx, ctx, len); security_release_secctx(ctx, len); } audit_send_reply(skb, seq, AUDIT_SIGNAL_INFO, 0, 0, sig_data, sizeof(*sig_data) + len); kfree(sig_data); break; case AUDIT_TTY_GET: { struct audit_tty_status s; unsigned int t; t = READ_ONCE(current->signal->audit_tty); s.enabled = t & AUDIT_TTY_ENABLE; s.log_passwd = !!(t & AUDIT_TTY_LOG_PASSWD); audit_send_reply(skb, seq, AUDIT_TTY_GET, 0, 0, &s, sizeof(s)); break; } case AUDIT_TTY_SET: { struct audit_tty_status s, old; struct audit_buffer *ab; unsigned int t; memset(&s, 0, sizeof(s)); /* guard against past and future API changes */ memcpy(&s, data, min_t(size_t, sizeof(s), nlmsg_len(nlh))); /* check if new data is valid */ if ((s.enabled != 0 && s.enabled != 1) || (s.log_passwd != 0 && s.log_passwd != 1)) err = -EINVAL; if (err) t = READ_ONCE(current->signal->audit_tty); else { t = s.enabled | (-s.log_passwd & AUDIT_TTY_LOG_PASSWD); t = xchg(&current->signal->audit_tty, t); } old.enabled = t & AUDIT_TTY_ENABLE; old.log_passwd = !!(t & AUDIT_TTY_LOG_PASSWD); audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE); audit_log_format(ab, " op=tty_set old-enabled=%d new-enabled=%d" " old-log_passwd=%d new-log_passwd=%d res=%d", old.enabled, s.enabled, old.log_passwd, s.log_passwd, !err); audit_log_end(ab); break; } default: err = -EINVAL; break; } return err < 0 ? err : 0; }

Contributors

PersonTokensPropCommitsCommitProp
al viroal viro32220.68%23.03%
richard guy briggsrichard guy briggs32020.55%1522.73%
andrew mortonandrew morton22614.52%11.52%
miloslav trmacmiloslav trmac1509.63%23.03%
eric pariseric paris1509.63%1116.67%
steve grubbsteve grubb1107.06%710.61%
david woodhousedavid woodhouse724.62%46.06%
peter hurleypeter hurley684.37%23.03%
amy griffisamy griffis402.57%11.52%
serge hallynserge hallyn301.93%34.55%
eric w. biedermaneric w. biederman191.22%46.06%
zhang xiliangzhang xiliang110.71%11.52%
mathias krausemathias krause100.64%23.03%
ahmed s. darwishahmed s. darwish70.45%11.52%
pavel emelianovpavel emelianov70.45%11.52%
harvey harrisonharvey harrison50.32%11.52%
gao fenggao feng30.19%23.03%
thomas gleixnerthomas gleixner20.13%11.52%
randy dunlaprandy dunlap10.06%11.52%
david s. millerdavid s. miller10.06%11.52%
linus torvaldslinus torvalds10.06%11.52%
peng haitaopeng haitao10.06%11.52%
chris wrightchris wright10.06%11.52%
Total1557100.00%66100.00%

/* * Get message from skb. Each message is processed by audit_receive_msg. * Malformed skbs with wrong length are discarded silently. */
static void audit_receive_skb(struct sk_buff *skb) { struct nlmsghdr *nlh; /* * len MUST be signed for nlmsg_next to be able to dec it below 0 * if the nlmsg_len was not aligned */ int len; int err; nlh = nlmsg_hdr(skb); len = skb->len; while (nlmsg_ok(nlh, len)) { err = audit_receive_msg(skb, nlh); /* if err or if this message says it wants a response */ if (err || (nlh->nlmsg_flags & NLM_F_ACK)) netlink_ack(skb, nlh, err); nlh = nlmsg_next(nlh, &len); } }

Contributors

PersonTokensPropCommitsCommitProp
andrew mortonandrew morton5967.05%116.67%
eric pariseric paris2123.86%116.67%
arnaldo carvalho de meloarnaldo carvalho de melo33.41%116.67%
hong zhi guohong zhi guo33.41%116.67%
alex copotalex copot11.14%116.67%
herbert xuherbert xu11.14%116.67%
Total88100.00%6100.00%

/* Receive messages from netlink socket. */
static void audit_receive(struct sk_buff *skb) { mutex_lock(&audit_cmd_mutex); audit_receive_skb(skb); mutex_unlock(&audit_cmd_mutex); }

Contributors

PersonTokensPropCommitsCommitProp
andrew mortonandrew morton1967.86%120.00%
herbert xuherbert xu310.71%120.00%
ingo molnaringo molnar27.14%120.00%
amy griffisamy griffis27.14%120.00%
denis v. lunevdenis v. lunev27.14%120.00%
Total28100.00%5100.00%

/* Run custom bind function on netlink socket group connect or bind requests. */
static int audit_bind(struct net *net, int group) { if (!capable(CAP_AUDIT_READ)) return -EPERM; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
richard guy briggsrichard guy briggs2482.76%150.00%
johannes bergjohannes berg517.24%150.00%
Total29100.00%2100.00%


static int __net_init audit_net_init(struct net *net) { struct netlink_kernel_cfg cfg = { .input = audit_receive, .bind = audit_bind, .flags = NL_CFG_F_NONROOT_RECV, .groups = AUDIT_NLGRP_MAX, }; struct audit_net *aunet = net_generic(net, audit_net_id); aunet->nlsk = netlink_kernel_create(net, NETLINK_AUDIT, &cfg); if (aunet->nlsk == NULL) { audit_panic("cannot initialize netlink socket in namespace"); return -ENOMEM; } aunet->nlsk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
richard guy briggsrichard guy briggs4952.13%333.33%
andrew mortonandrew morton1920.21%111.11%
pablo neira ayusopablo neira ayuso1313.83%111.11%
gao fenggao feng66.38%111.11%
david woodhousedavid woodhouse55.32%111.11%
chris wrightchris wright11.06%111.11%
eric w. biedermaneric w. biederman11.06%111.11%
Total94100.00%9100.00%


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; if (sock == audit_sock) { audit_pid = 0; audit_sock = NULL; } RCU_INIT_POINTER(aunet->nlsk, NULL); synchronize_net(); netlink_kernel_release(sock); }

Contributors

PersonTokensPropCommitsCommitProp
richard guy briggsrichard guy briggs6598.48%150.00%
monam agarwalmonam agarwal11.52%150.00%
Total66100.00%2100.00%

static struct pernet_operations audit_net_ops __net_initdata = { .init = audit_net_init, .exit = audit_net_exit, .id = &audit_net_id, .size = sizeof(struct audit_net), }; /* Initialize audit support at boot time. */
static int __init audit_init(void) { int i; if (audit_initialized == AUDIT_DISABLED) return 0; pr_info("initializing netlink subsys (%s)\n", audit_default ? "enabled" : "disabled"); register_pernet_subsys(&audit_net_ops); skb_queue_head_init(&audit_skb_queue); skb_queue_head_init(&audit_skb_hold_queue); audit_initialized = AUDIT_INITIALIZED; audit_enabled = audit_default; audit_ever_enabled |= !!audit_default; audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL, "initialized"); for (i = 0; i < AUDIT_INODE_BUCKETS; i++) INIT_LIST_HEAD(&audit_inode_hash[i]); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
richard guy briggsrichard guy briggs3636.00%110.00%
amy griffisamy griffis2222.00%110.00%
andrew mortonandrew morton1818.00%110.00%
eric pariseric paris1313.00%330.00%
david woodhousedavid woodhouse88.00%220.00%
steve grubbsteve grubb22.00%110.00%
joe perchesjoe perches11.00%110.00%
Total100100.00%10100.00%

__initcall(audit_init); /* Process kernel command-line parameter at boot time. audit=0 or audit=1. */
static int __init audit_enable(char *str) { audit_default = !!simple_strtol(str, NULL, 0); if (!audit_default) audit_initialized = AUDIT_DISABLED; pr_info("%s\n", audit_default ? "enabled (after initialization)" : "disabled (until reboot)"); return 1; }

Contributors

PersonTokensPropCommitsCommitProp
andrew mortonandrew morton3165.96%120.00%
eric pariseric paris1123.40%120.00%
gao fenggao feng36.38%120.00%
joe perchesjoe perches12.13%120.00%
hirofumi ogawahirofumi ogawa12.13%120.00%
Total47100.00%5100.00%

__setup("audit=", audit_enable); /* Process kernel command-line parameter at boot time. * audit_backlog_limit=<n> */
static int __init audit_backlog_limit_set(char *str) { u32 audit_backlog_limit_arg; pr_info("audit_backlog_limit: "); if (kstrtouint(str, 0, &audit_backlog_limit_arg)) { pr_cont("using default of %u, unable to parse %s\n", audit_backlog_limit, str); return 1; } audit_backlog_limit = audit_backlog_limit_arg; pr_cont("%d\n", audit_backlog_limit); return 1; }

Contributors

PersonTokensPropCommitsCommitProp
richard guy briggsrichard guy briggs5491.53%133.33%
joe perchesjoe perches58.47%266.67%
Total59100.00%3100.00%

__setup("audit_backlog_limit=", audit_backlog_limit_set);
static void audit_buffer_free(struct audit_buffer *ab) { unsigned long flags; if (!ab) return; kfree_skb(ab->skb); spin_lock_irqsave(&audit_freelist_lock, flags); if (audit_freelist_count > AUDIT_MAXFREE) kfree(ab); else { audit_freelist_count++; list_add(&ab->list, &audit_freelist); } spin_unlock_irqrestore(&audit_freelist_lock, flags); }

Contributors

PersonTokensPropCommitsCommitProp
chris wrightchris wright4562.50%360.00%
andrew mortonandrew morton2230.56%120.00%
serge hallynserge hallyn56.94%120.00%
Total72100.00%5100.00%


static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx, gfp_t gfp_mask, int type) { unsigned long flags; struct audit_buffer *ab = NULL; struct nlmsghdr *nlh; spin_lock_irqsave(&audit_freelist_lock, flags); if (!list_empty(&audit_freelist)) { ab = list_entry(audit_freelist.next, struct audit_buffer, list); list_del(&ab->list); --audit_freelist_count; } spin_unlock_irqrestore(&audit_freelist_lock, flags); if (!ab) { ab = kmalloc(sizeof(*ab), gfp_mask); if (!ab) goto err; } ab->ctx = ctx; ab->gfp_mask = gfp_mask; ab->skb = nlmsg_new(AUDIT_BUFSIZ, gfp_mask); if (!ab->skb) goto err; nlh = nlmsg_put(ab->skb, 0, 0, type, 0, 0); if (!nlh) goto out_kfree_skb; return ab; out_kfree_skb: kfree_skb(ab->skb); ab->skb = NULL; err: audit_buffer_free(ab); return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
andrew mortonandrew morton7436.45%111.11%
chris wrightchris wright5426.60%333.33%
eric pariseric paris3215.76%111.11%
steve grubbsteve grubb2914.29%111.11%
david s. millerdavid s. miller115.42%111.11%
david woodhousedavid woodhouse20.99%111.11%
al viroal viro10.49%111.11%
Total203100.00%9100.00%

/** * audit_serial - compute a serial number for the audit record * * Compute a serial number for the audit record. Audit records are * written to user-space as soon as they are generated, so a complete * audit record may be written in several pieces. The timestamp of the * record and this serial number are used by the user-space tools to * determine which pieces belong to the same audit record. The * (timestamp,serial) tuple is unique for each syscall and is live from * syscall entry to syscall exit. * * NOTE: Another possibility is to store the formatted records off the * audit context (for those records that have a context), and emit them * all at syscall exit. However, this could delay the reporting of * significant errors until syscall exit (or never, if the system * halts). */
unsigned int audit_serial(void) { static atomic_t serial = ATOMIC_INIT(0); return atomic_add_return(1, &serial); }

Contributors

PersonTokensPropCommitsCommitProp
david woodhousedavid woodhouse1869.23%266.67%
richard guy briggsrichard guy briggs830.77%133.33%
Total26100.00%3100.00%


static inline void audit_get_stamp(struct audit_context *ctx, struct timespec *t, unsigned int *serial) { if (!ctx || !auditsc_get_stamp(ctx, t, serial)) { *t = CURRENT_TIME; *serial = audit_serial(); } }

Contributors

PersonTokensPropCommitsCommitProp
david woodhousedavid woodhouse4692.00%150.00%
al viroal viro48.00%150.00%
Total50100.00%2100.00%

/* * Wait for auditd to drain the queue a little */
static long wait_for_auditd(long sleep_time) { DECLARE_WAITQUEUE(wait, current); if (audit_backlog_limit && skb_queue_len(&audit_skb_queue) > audit_backlog_limit) { add_wait_queue_exclusive(&audit_backlog_wait, &wait); set_current_state(TASK_UNINTERRUPTIBLE); sleep_time = schedule_timeout(sleep_time); remove_wait_queue(&audit_backlog_wait, &wait); } return sleep_time; }

Contributors

PersonTokensPropCommitsCommitProp
andrew mortonandrew morton4165.08%120.00%
paul moorepaul moore1523.81%120.00%
richard guy briggsrichard guy briggs46.35%120.00%
eric pariseric paris23.17%120.00%
dan duvaldan duval11.59%120.00%
Total63100.00%5100.00%

/** * audit_log_start - obtain an audit buffer * @ctx: audit_context (may be NULL) * @gfp_mask: type of allocation * @type: audit message type * * Returns audit_buffer pointer on success or NULL on error. * * Obtain an audit buffer. This routine does locking to obtain the * audit buffer, but then no locking is required for calls to * audit_log_*format. If the task (ctx) is a task that is currently in a * syscall, then the syscall is marked as auditable and an audit record * will be written at syscall exit. If there is no associated task, then * task context (ctx) should be NULL. */
struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type) { struct audit_buffer *ab = NULL; struct timespec t; unsigned int uninitialized_var(serial); int reserve = 5; /* Allow atomic callers to go up to five entries over the normal backlog limit */ unsigned long timeout_start = jiffies; if (audit_initialized != AUDIT_INITIALIZED) return NULL; if (unlikely(audit_filter_type(type))) return NULL; if (gfp_mask & __GFP_DIRECT_RECLAIM) { if (audit_pid && audit_pid == current->tgid) gfp_mask &= ~__GFP_DIRECT_RECLAIM; else reserve = 0; } while (audit_backlog_limit && skb_queue_len(&audit_skb_queue) > audit_backlog_limit + reserve) { if (gfp_mask & __GFP_DIRECT_RECLAIM && audit_backlog_wait_time) { long sleep_time; sleep_time = timeout_start + audit_backlog_wait_time - jiffies; if (sleep_time > 0) { sleep_time = wait_for_auditd(sleep_time); if (sleep_time > 0) continue; } } if (audit_rate_check() && printk_ratelimit()) pr_warn("audit_backlog=%d > audit_backlog_limit=%d\n", skb_queue_len(&audit_skb_queue), audit_backlog_limit); audit_log_lost("backlog limit exceeded"); audit_backlog_wait_time = 0; wake_up(&audit_backlog_wait); return NULL; } if (!reserve && !audit_backlog_wait_time) audit_backlog_wait_time = audit_backlog_wait_time_master; ab = audit_buffer_alloc(ctx, gfp_mask, type); if (!ab) { audit_log_lost("out of memory in audit_log_start"); return NULL; } audit_get_stamp(ab->ctx, &t, &serial); audit_log_format(ab, "audit(%lu.%03lu:%u): ", t.tv_sec, t.tv_nsec/1000000, serial); return ab; }

Contributors

PersonTokensPropCommitsCommitProp
david woodhousedavid woodhouse9133.83%311.54%
andrew mortonandrew morton5520.45%311.54%
chris wrightchris wright5319.70%415.38%
richard guy briggsrichard guy briggs217.81%623.08%
toshiyuki okajimatoshiyuki okajima186.69%13.85%
dustin kirklanddustin kirkland134.83%13.85%
eric pariseric paris51.86%27.69%
steve grubbsteve grubb41.49%13.85%
mel gormanmel gorman31.12%13.85%
konstantin khlebnikovkonstantin khlebnikov20.74%13.85%
joe perchesjoe perches20.74%13.85%
paul moorepaul moore10.37%13.85%
al viroal viro10.37%13.85%
Total269100.00%26100.00%

/** * audit_expand - expand skb in the audit buffer * @ab: audit_buffer * @extra: space to add at tail of the skb * * Returns 0 (no space) on failed expansion, or available space if * successful. */
static inline int audit_expand(struct audit_buffer *ab, int extra) { struct sk_buff *skb = ab->skb; int oldtail = skb_tailroom(skb); int ret = pskb_expand_head(skb, 0, extra, ab->gfp_mask); int newtail = skb_tailroom(skb); if (ret < 0) { audit_log_lost("out of memory in audit_expand"); return 0; } skb->truesize += newtail - oldtail; return newtail; }

Contributors

PersonTokensPropCommitsCommitProp
chris wrightchris wright5060.24%240.00%
herbert xuherbert xu2631.33%120.00%
david woodhousedavid woodhouse78.43%240.00%
Total83100.00%5100.00%

/* * Format an audit message into the audit buffer. If there isn't enough * room in the audit buffer, more room will be allocated and vsnprint * will be called a second time. Currently, we assume that a printk * can't format message larger than 1024 bytes, so we don't either. */
static void audit_log_vformat(struct audit_buffer *ab, const char *fmt, va_list args) { int len, avail; struct sk_buff *skb; va_list args2; if (!ab) return; BUG_ON(!ab->skb); skb = ab->skb; avail = skb_tailroom(skb); if (avail == 0) { avail = audit_expand(ab, AUDIT_BUFSIZ); if (!avail) goto out; } va_copy(args2, args); len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args); if (len >= avail) { /* The printk buffer is 1024 bytes long, so if we get * here and AUDIT_BUFSIZ is at least 1024, then we can * log everything that printk could have logged. */ avail = audit_expand(ab, max_t(unsigned, AUDIT_BUFSIZ, 1+len-avail)); if (!avail) goto out_va_end; len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args2); } if (len > 0) skb_put(skb, len); out_va_end: va_end(args2); out: return; }

Contributors

PersonTokensPropCommitsCommitProp
andrew mortonandrew morton8848.09%110.00%
chris wrightchris wright4926.78%220.00%
david woodhousedavid woodhouse2614.21%440.00%
jesper juhljesper juhl84.37%110.00%
steve grubbsteve grubb63.28%110.00%
arnaldo carvalho de meloarnaldo carvalho de melo63.28%110.00%
Total183100.00%10100.00%

/** * audit_log_format - format a message into the audit buffer. * @ab: audit_buffer * @fmt: format string * @...: optional parameters matching @fmt string * * All the work is done in audit_log_vformat. */
void audit_log_format(struct audit_buffer *ab, const char *fmt, ...) { va_list args; if (!ab) return; va_start(args, fmt); audit_log_vformat(ab, fmt, args); va_end(args); }

Contributors

PersonTokensPropCommitsCommitProp
andrew mortonandrew morton4697.87%150.00%
david woodhousedavid woodhouse12.13%150.00%
Total47100.00%2100.00%

/** * audit_log_hex - convert a buffer to hex and append it to the audit skb * @ab: the audit_buffer * @buf: buffer to convert to hex * @len: length of @buf to be converted * * No return value; failure to expand is silently ignored. * * 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_n_hex(struct audit_buffer *ab, const unsigned char *buf, size_t len) { int i, avail, new_len; unsigned char *ptr; struct sk_buff *skb; if (!ab) return; BUG_ON(!ab->skb); skb = ab->skb; avail = skb_tailroom(skb); new_len = len<<1; if (new_len >= avail) { /* Round the buffer request up to the next multiple */ new_len = AUDIT_BUFSIZ*(((new_len-avail)/AUDIT_BUFSIZ) + 1); avail = audit_expand(ab, new_len); if (!avail) return; } ptr = skb_tail_pointer(skb); for (i = 0; i < len; i++) ptr = hex_byte_pack_upper(ptr, buf[i]); *ptr = 0; skb_put(skb, len << 1); /* new string is twice the old string */ }

Contributors

PersonTokensPropCommitsCommitProp
steve grubbsteve grubb10968.99%116.67%
david woodhousedavid woodhouse3522.15%116.67%
amy griffisamy griffis63.80%116.67%
joe perchesjoe perches42.53%116.67%
arnaldo carvalho de meloarnaldo carvalho de melo31.90%116.67%
eric pariseric paris10.63%116.67%
Total158100.00%6100.00%

/* * Format a string of no more than slen characters into the audit buffer, * enclosed in quote marks. */
void audit_log_n_string(struct audit_buffer *ab, const char *string, size_t slen) { int avail, new_len; unsigned char *ptr; struct sk_buff *skb; if (!ab) return; BUG_ON(!ab->skb); skb = ab->skb; avail = skb_tailroom(skb); new_len = slen + 3; /* enclosing quotes + null terminator */ if (new_len > avail) { avail = audit_expand(ab, new_len); if (!avail) return; } ptr = skb_tail_pointer(skb); *ptr++ = '"'; memcpy(ptr, string, slen); ptr += slen; *ptr++ = '"'; *ptr = 0; skb_put(skb, slen + 2); /* don't include null terminator */ }

Contributors

PersonTokensPropCommitsCommitProp
amy griffisamy griffis12893.43%240.00%
arnaldo carvalho de meloarnaldo carvalho de melo32.19%120.00%
eric pariseric paris32.19%120.00%
al viroal viro32.19%120.00%
Total137100.00%5100.00%

/** * audit_string_contains_control - does a string need to be logged in hex * @string: string to be checked * @len: max length of the string to check */
bool audit_string_contains_control(const char *string, size_t len) { const unsigned char *p; for (p = string; p < (const unsigned char *)string + len; p++) { if (*p == '"' || *p < 0x21 || *p > 0x7e) return true; } return false; }

Contributors

PersonTokensPropCommitsCommitProp
david woodhousedavid woodhouse2436.92%112.50%
miloslav trmacmiloslav trmac2132.31%112.50%
eric pariseric paris913.85%112.50%
amy griffisamy griffis57.69%112.50%
yaowei baiyaowei bai34.62%112.50%
andrew mortonandrew morton11.54%112.50%
vesa-matti karivesa-matti kari11.54%112.50%
steve grubbsteve grubb11.54%112.50%
Total65100.00%8100.00%

/** * audit_log_n_untrustedstring - log a string that may contain random characters * @ab: audit_buffer * @len: length of string (not including trailing null) * @string: string to be logged * * This code will escape a string that is passed to it if the string * contains a control character, unprintable character, double quote mark, * or a space. Unescaped strings will start and end with a double quote mark. * Strings that are escaped are printed in hex (2 digits per char). * * 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, const char *string, size_t len) { if (audit_string_contains_control(string, len)) audit_log_n_hex(ab, string, len); else audit_log_n_string(ab, string, len); }

Contributors

PersonTokensPropCommitsCommitProp
eric pariseric paris2963.04%233.33%
david woodhousedavid woodhouse1430.43%116.67%
amy griffisamy griffis12.17%116.67%
al viroal viro12.17%116.67%
andrew mortonandrew morton12.17%116.67%
Total46100.00%6100.00%

/** * audit_log_untrustedstring - log a string that may contain random characters * @ab: audit_buffer * @string: string to be logged * * Same as audit_log_n_untrustedstring(), except that strlen is used to * determine string length. */
void audit_log_untrustedstring(struct audit_buffer *ab, const char *string) { audit_log_n_untrustedstring(ab, string, strlen(string)); }

Contributors

PersonTokensPropCommitsCommitProp
amy griffisamy griffis2385.19%133.33%
eric pariseric paris414.81%266.67%
Total27100.00%3100.00%

/* This is a helper-function to print the escaped d_path */
void audit_log_d_path(struct audit_buffer *ab, const char *prefix, const struct path *path) { char *p, *pathname; if (prefix) audit_log_format(ab, "%s", prefix); /* We will allow 11 spaces for ' (deleted)' to be appended */ pathname = kmalloc(PATH_MAX+11, ab->gfp_mask); if (!pathname) { audit_log_string(ab, "<no_memory>"); return; } p = d_path(path, pathname, PATH_MAX+11); if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */ /* FIXME: can we save some information here? */ audit_log_string(ab, "<too_long>"); } else audit_log_untrustedstring(ab, p); kfree(pathname); }

Contributors

PersonTokensPropCommitsCommitProp
andrew mortonandrew morton6456.14%111.11%
steve grubbsteve grubb2622.81%111.11%
jan blunckjan blunck97.89%111.11%
eric pariseric paris43.51%111.11%
chris wrightchris wright43.51%111.11%
david woodhousedavid woodhouse32.63%111.11%
andrea arcangeliandrea arcangeli21.75%111.11%
al viroal viro10.88%111.11%
kees cookkees cook10.88%111.11%
Total114100.00%9100.00%


void audit_log_session_info(struct audit_buffer *ab) { unsigned int sessionid = audit_get_sessionid(current); uid_t auid = from_kuid(&init_user_ns, audit_get_loginuid(current)); audit_log_format(ab, " auid=%u ses=%u", auid, sessionid); }

Contributors

PersonTokensPropCommitsCommitProp
eric pariseric paris4397.73%266.67%
richard guy briggsrichard guy briggs12.27%133.33%
Total44100.00%3100.00%


void audit_log_key(struct audit_buffer *ab, char *key) { audit_log_format(ab, " key="); if (key) audit_log_untrustedstring(ab, key); else audit_log_format(ab, "(null)"); }

Contributors

PersonTokensPropCommitsCommitProp
eric pariseric paris40100.00%1100.00%
Total40100.00%1100.00%


void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap) { int i; audit_log_format(ab, " %s=", prefix); CAP_FOR_EACH_U32(i) { audit_log_format(ab, "%08x", cap->cap[CAP_LAST_U32 - i]); } }

Contributors

PersonTokensPropCommitsCommitProp
eric pariseric paris2853.85%266.67%
kees cookkees cook2446.15%133.33%
Total52100.00%3100.00%


static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name) { kernel_cap_t *perm = &name->fcap.permitted; kernel_cap_t *inh = &name->fcap.inheritable; int log = 0; if (!cap_isclear(*perm)) { audit_log_cap(ab, "cap_fp", perm); log = 1; } if (!cap_isclear(*inh)) { audit_log_cap(ab, "cap_fi", inh); log = 1; } if (log) audit_log_format(ab, " cap_fe=%d cap_fver=%x", name->fcap.fE, name->fcap_ver); }

Contributors

PersonTokensPropCommitsCommitProp
eric pariseric paris8979.46%133.33%
kees cookkees cook2219.64%133.33%
richard guy briggsrichard guy briggs10.89%133.33%
Total112100.00%3100.00%


static inline int audit_copy_fcaps(struct audit_names *name, const struct dentry *dentry) { struct cpu_vfs_cap_data caps; int rc; if (!dentry) return 0; rc = get_vfs_caps_from_disk(dentry, &caps); if (rc) return rc; name->fcap.permitted = caps.permitted; name->fcap.inheritable = caps.inheritable; name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE); name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
eric pariseric paris10097.09%150.00%
kees cookkees cook32.91%150.00%
Total103100.00%2100.00%

/* Copy inode data into an audit_names. */
void audit_copy_inode(struct audit_names *name, const struct dentry *dentry, struct inode *inode) { name->ino = inode->i_ino; name->dev = inode->i_sb->s_dev; name->mode = inode->i_mode; name->uid = inode->i_uid; name->gid = inode->i_gid; name->rdev = inode->i_rdev; security_inode_getsecid(inode, &name->osid); audit_copy_fcaps(name, dentry); }

Contributors

PersonTokensPropCommitsCommitProp
eric pariseric paris7888.64%150.00%
kees cookkees cook1011.36%150.00%
Total88100.00%2100.00%

/** * audit_log_name - produce AUDIT_PATH record from struct audit_names * @context: audit_context for the task * @n: audit_names structure with reportable details * @path: optional path to report instead of audit_names->name * @record_num: record number to report when handling a list of names * @call_panic: optional pointer to int that will be updated if secid fails */
void audit_log_name(struct audit_context *context, struct audit_names *n, struct path *path, int record_num, int *call_panic) { struct audit_buffer *ab; ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH); if (!ab) return; audit_log_format(ab, "item=%d", record_num); if (path) audit_log_d_path(ab, " name=", path); else if (n->name) { switch (n->name_len) { case AUDIT_NAME_FULL: /* log the full path */ audit_log_format(ab, " name="); audit_log_untrustedstring(ab, n->name->name); break; case 0: /* name was specified as a relative path and the * directory component is the cwd */ audit_log_d_path(ab, " name=", &context->pwd); break; default: /* log the name's directory component */ audit_log_format(ab, " name="); audit_log_n_untrustedstring(ab, n->name->name, n->name_len); } } else audit_log_format(ab, " name=(null)"); if (n->ino != AUDIT_INO_UNSET) audit_log_format(ab, " inode=%lu" " dev=%02x:%02x mode=%#ho" " ouid=%u ogid=%u rdev=%02x:%02x", n->ino, MAJOR(n->dev), MINOR(n->dev), n->mode, from_kuid(&init_user_ns, n->uid), from_kgid(&init_user_ns, n->gid), MAJOR(n->rdev), MINOR(n->rdev)); if (n->osid != 0) { char *ctx = NULL; u32 len; if (security_secid_to_secctx( n->osid, &ctx, &len)) { audit_log_format(ab, " osid=%u", n->osid); if (call_panic) *call_panic = 2; } else { audit_log_format(ab, " obj=%s", ctx); security_release_secctx(ctx, len); } } /* log the audit_names record type */ audit_log_format(ab, " nametype="); switch(n->type) { case AUDIT_TYPE_NORMAL: audit_log_format(ab, "NORMAL"); break; case AUDIT_TYPE_PARENT: audit_log_format(ab, "PARENT"); break; case AUDIT_TYPE_CHILD_DELETE: audit_log_format(ab, "DELETE"); break; case AUDIT_TYPE_CHILD_CREATE: audit_log_format(ab, "CREATE"); break; default: audit_log_format(ab, "UNKNOWN"); break; } audit_log_fcaps(ab, n); audit_log_end(ab); }

Contributors

PersonTokensPropCommitsCommitProp
eric pariseric paris31982.01%133.33%
jeff laytonjeff layton6917.74%133.33%
richard guy briggsrichard guy briggs10.26%133.33%
Total389100.00%3100.00%


int audit_log_task_context(struct audit_buffer *ab) { char *ctx = NULL; unsigned len; int error; u32 sid; security_task_getsecid(current, &sid); if (!sid) return 0; error = security_secid_to_secctx(sid, &ctx, &len); if (error) { if (error != -EINVAL) goto error_path; return 0; } audit_log_format(ab, " subj=%s", ctx); security_release_secctx(ctx, len); return 0; error_path: audit_panic("error in audit_log_task_context"); return error; }

Contributors

PersonTokensPropCommitsCommitProp
eric pariseric paris102100.00%1100.00%
Total102100.00%1100.00%

EXPORT_SYMBOL(audit_log_task_context);
void audit_log_d_path_exe(struct audit_buffer *ab, struct mm_struct *mm) { struct file *exe_file; if (!mm) goto out_null; exe_file = get_mm_exe_file(mm); if (!exe_file) goto out_null; audit_log_d_path(ab, " exe=", &exe_file->f_path); fput(exe_file); return; out_null: audit_log_format(ab, " exe=(null)"); }

Contributors

PersonTokensPropCommitsCommitProp
davidlohr buesodavidlohr bueso70100.00%2100.00%
Total70100.00%2100.00%


struct tty_struct *audit_get_tty(struct task_struct *tsk) { struct tty_struct *tty = NULL; unsigned long flags; spin_lock_irqsave(&tsk->sighand->siglock, flags); if (tsk->signal) tty = tty_kref_get(tsk->signal->tty); spin_unlock_irqrestore(&tsk->sighand->siglock, flags); return tty; }

Contributors

PersonTokensPropCommitsCommitProp
richard guy briggsrichard guy briggs67100.00%1100.00%
Total67100.00%1100.00%


void audit_put_tty(struct tty_struct *tty) { tty_kref_put(tty); }

Contributors

PersonTokensPropCommitsCommitProp
richard guy briggsrichard guy briggs15100.00%1100.00%
Total15100.00%1100.00%


void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk) { const struct cred *cred; char comm[sizeof(tsk->comm)]; struct tty_struct *tty; if (!ab) return; /* tsk == current */ cred = current_cred(); tty = audit_get_tty(tsk); audit_log_format(ab, " ppid=%d pid=%d auid=%u uid=%u gid=%u" " euid=%u suid=%u fsuid=%u" " egid=%u sgid=%u fsgid=%u tty=%s ses=%u", task_ppid_nr(tsk), task_pid_nr(tsk), from_kuid(&init_user_ns, audit_get_loginuid(tsk)), from_kuid(&init_user_ns, cred->uid), from_kgid(&init_user_ns, cred->gid), from_kuid(&init_user_ns, cred->euid), from_kuid(&init_user_ns, cred->suid), from_kuid(&init_user_ns, cred->fsuid), from_kgid(&init_user_ns, cred->egid), from_kgid(&init_user_ns, cred->sgid), from_kgid(&init_user_ns, cred->fsgid), tty ? tty_name(tty) : "(none)", audit_get_sessionid(tsk)); audit_put_tty(tty); audit_log_format(ab, " comm="); audit_log_untrustedstring(ab, get_task_comm(comm, tsk)); audit_log_d_path_exe(ab, tsk->mm); audit_log_task_context(ab); }

Contributors

PersonTokensPropCommitsCommitProp
eric pariseric paris18183.03%112.50%
richard guy briggsrichard guy briggs3315.14%562.50%
paul davies cpaul davies c20.92%112.50%
davidlohr buesodavidlohr bueso20.92%112.50%
Total218100.00%8100.00%

EXPORT_SYMBOL(audit_log_task_info); /** * audit_log_link_denied - report a link restriction denial * @operation: specific link operation * @link: the path that triggered the restriction */
void audit_log_link_denied(const char *operation, struct path *link) { struct audit_buffer *ab; struct audit_names *name; name = kzalloc(sizeof(*name), GFP_NOFS); if (!name) return; /* Generate AUDIT_ANOM_LINK with subject, operation, outcome. */ ab = audit_log_start(current->audit_context, GFP_KERNEL, AUDIT_ANOM_LINK); if (!ab) goto out; audit_log_format(ab, "op=%s", operation); audit_log_task_info(ab, current); audit_log_format(ab, " res=0"); audit_log_end(ab); /* Generate AUDIT_PATH record with object. */ name->type = AUDIT_TYPE_NORMAL; audit_copy_inode(name, link->dentry, d_backing_inode(link->dentry)); audit_log_name(current->audit_context, name, link, 0, NULL); out: kfree(name); }

Contributors

PersonTokensPropCommitsCommitProp
eric pariseric paris11985.61%133.33%
kees cookkees cook1712.23%133.33%
david howellsdavid howells32.16%133.33%
Total139100.00%3100.00%

/** * audit_log_end - end one audit record * @ab: the audit_buffer * * netlink_unicast() cannot be called inside an irq context because it blocks * (last arg, flags, is not set to MSG_DONTWAIT), so the audit buffer is placed * on a queue and a tasklet is scheduled to remove them from the queue outside * the irq context. May be called in any context. */
void audit_log_end(struct audit_buffer *ab) { if (!ab) return; if (!audit_rate_check()) { audit_log_lost("rate limit exceeded"); } else { struct nlmsghdr *nlh = nlmsg_hdr(ab->skb); nlh->nlmsg_len = ab->skb->len; kauditd_send_multicast_skb(ab->skb, ab->gfp_mask); /* * The original kaudit unicast socket sends up messages with * nlmsg_len set to the payload length rather than the entire * message length. This breaks the standard set by netlink. * 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. */ nlh->nlmsg_len -= NLMSG_HDRLEN; if (audit_pid) { skb_queue_tail(&audit_skb_queue, ab->skb); wake_up_interruptible(&kauditd_wait); } else { audit_printk_skb(ab->skb); } ab->skb = NULL; } audit_buffer_free(ab); }

Contributors

PersonTokensPropCommitsCommitProp
andrew mortonandrew morton3933.91%111.11%
david woodhousedavid woodhouse2824.35%111.11%
richard guy briggsrichard guy briggs2320.00%333.33%
eric pariseric paris2118.26%222.22%
arnaldo carvalho de meloarnaldo carvalho de melo32.61%111.11%
hong zhi guohong zhi guo10.87%111.11%
Total115100.00%9100.00%

/** * audit_log - Log an audit record * @ctx: audit context * @gfp_mask: type of allocation * @type: audit message type * @fmt: format string to use * @...: variable parameters matching the format string * * This is a convenience function that calls audit_log_start, * audit_log_vformat, and audit_log_end. It may be called * in any context. */
void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type, const char *fmt, ...) { struct audit_buffer *ab; va_list args; ab = audit_log_start(ctx, gfp_mask, type); if (ab) { va_start(args, fmt); audit_log_vformat(ab, fmt, args); va_end(args); audit_log_end(ab); } }

Contributors

PersonTokensPropCommitsCommitProp
andrew mortonandrew morton6385.14%120.00%
david woodhousedavid woodhouse56.76%120.00%
chris wrightchris wright45.41%120.00%
steve grubbsteve grubb11.35%120.00%
al viroal viro11.35%120.00%
Total74100.00%5100.00%

#ifdef CONFIG_SECURITY /** * audit_log_secctx - Converts and logs SELinux context * @ab: audit_buffer * @secid: security number * * This is a helper function that calls security_secid_to_secctx to convert * secid to secctx and then adds the (converted) SELinux context to the audit * log by calling audit_log_format, thus also preventing leak of internal secid * to userspace. If secid cannot be converted audit_panic is called. */
void audit_log_secctx(struct audit_buffer *ab, u32 secid) { u32 len; char *secctx; if (security_secid_to_secctx(secid, &secctx, &len)) { audit_panic("Cannot convert secid to context"); } else { audit_log_format(ab, " obj=%s", secctx); security_release_secctx(secctx, len); } }

Contributors

PersonTokensPropCommitsCommitProp
mr dash fourmr dash four59100.00%1100.00%
Total59100.00%1100.00%

EXPORT_SYMBOL(audit_log_secctx); #endif EXPORT_SYMBOL(audit_log_start); EXPORT_SYMBOL(audit_log_end); EXPORT_SYMBOL(audit_log_format); EXPORT_SYMBOL(audit_log);

Overall Contributors

PersonTokensPropCommitsCommitProp
eric pariseric paris251530.64%3515.56%
andrew mortonandrew morton144817.64%62.67%
richard guy briggsrichard guy briggs118114.39%4821.33%
david woodhousedavid woodhouse4855.91%156.67%
al viroal viro4775.81%83.56%
steve grubbsteve grubb4195.11%83.56%
chris wrightchris wright2673.25%62.67%
amy griffisamy griffis2503.05%41.78%
miloslav trmacmiloslav trmac1782.17%20.89%
serge hallynserge hallyn1051.28%31.33%
eric w. biedermaneric w. biederman1001.22%125.33%
kees cookkees cook971.18%31.33%
mr dash fourmr dash four780.95%10.44%
davidlohr buesodavidlohr bueso750.91%20.89%
jeff laytonjeff layton690.84%10.44%
peter hurleypeter hurley680.83%20.89%
joe perchesjoe perches440.54%31.33%
herbert xuherbert xu300.37%20.89%
david s. millerdavid s. miller240.29%10.44%
arnaldo carvalho de meloarnaldo carvalho de melo210.26%20.89%
lorenzo hernandez garcia-hierrolorenzo hernandez garcia-hierro200.24%10.44%
gao fenggao feng200.24%62.67%
paul moorepaul moore190.23%31.33%
toshiyuki okajimatoshiyuki okajima180.22%10.44%
dan duvaldan duval160.19%20.89%
thomas gleixnerthomas gleixner140.17%20.89%
dustin kirklanddustin kirkland130.16%10.44%
pablo neira ayusopablo neira ayuso130.16%10.44%
zhang xiliangzhang xiliang110.13%10.44%
randy dunlaprandy dunlap100.12%10.44%
mathias krausemathias krause100.12%20.89%
pavel emelianovpavel emelianov90.11%10.44%
jan blunckjan blunck90.11%10.44%
jesper juhljesper juhl80.10%10.44%
ahmed s. darwishahmed s. darwish80.10%20.89%
adrian bunkadrian bunk50.06%20.89%
jan engelhardtjan engelhardt50.06%10.44%
johannes bergjohannes berg50.06%10.44%
harvey harrisonharvey harrison50.06%10.44%
darrel goeddeldarrel goeddel50.06%20.89%
hong zhi guohong zhi guo40.05%10.44%
tyler hickstyler hicks40.05%10.44%
mel gormanmel gorman30.04%10.44%
nigel cunninghamnigel cunningham30.04%10.44%
tejun heotejun heo30.04%10.44%
stephen hemmingerstephen hemminger30.04%10.44%
david howellsdavid howells30.04%10.44%
ingo molnaringo molnar30.04%10.44%
yaowei baiyaowei bai30.04%10.44%
konstantin khlebnikovkonstantin khlebnikov20.02%10.44%
paul davies cpaul davies c20.02%10.44%
andrea arcangeliandrea arcangeli20.02%10.44%
dave jonesdave jones20.02%10.44%
denis v. lunevdenis v. lunev20.02%10.44%
fabian frederickfabian frederick10.01%10.44%
monam agarwalmonam agarwal10.01%10.44%
hirofumi ogawahirofumi ogawa10.01%10.44%
josh boyerjosh boyer10.01%10.44%
linus torvaldslinus torvalds10.01%10.44%
alex copotalex copot10.01%10.44%
peter zijlstrapeter zijlstra10.01%10.44%
vesa-matti karivesa-matti kari10.01%10.44%
arun sharmaarun sharma10.01%10.44%
shailendra vermashailendra verma10.01%10.44%
neil hormanneil horman10.01%10.44%
paul gortmakerpaul gortmaker10.01%10.44%
paul mcquadepaul mcquade10.01%10.44%
peng haitaopeng haitao10.01%10.44%
Total8207100.00%225100.00%
Directory: kernel
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