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2024-10-22 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5 
 kernel/kernel/audit.c
....@@ -1,23 +1,10 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /* audit.c -- Auditing support
23  * Gateway between the kernel (e.g., selinux) and the user-space audit daemon.
34  * System-call specific features have moved to auditsc.c
45  *
56  * Copyright 2003-2007 Red Hat Inc., Durham, North Carolina.
67  * All Rights Reserved.
7
- *
8
- * This program is free software; you can redistribute it and/or modify
9
- * it under the terms of the GNU General Public License as published by
10
- * the Free Software Foundation; either version 2 of the License, or
11
- * (at your option) any later version.
12
- *
13
- * This program is distributed in the hope that it will be useful,
14
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16
- * GNU General Public License for more details.
17
- *
18
- * You should have received a copy of the GNU General Public License
19
- * along with this program; if not, write to the Free Software
20
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
218  *
229  * Written by Rickard E. (Rik) Faith <faith@redhat.com>
2310  *
....@@ -60,7 +47,6 @@
6047 #include <linux/mutex.h>
6148 #include <linux/gfp.h>
6249 #include <linux/pid.h>
63
-#include <linux/slab.h>
6450 
6551 #include <linux/audit.h>
6652 
....@@ -116,12 +102,13 @@
116102  * This struct is RCU protected; you must either hold the RCU lock for reading
117103  * or the associated spinlock for writing.
118104  */
119
-static struct auditd_connection {
105
+struct auditd_connection {
120106 	struct pid *pid;
121107 	u32 portid;
122108 	struct net *net;
123109 	struct rcu_head rcu;
124
-} *auditd_conn = NULL;
110
+};
111
+static struct auditd_connection __rcu *auditd_conn;
125112 static DEFINE_SPINLOCK(auditd_conn_lock);
126113 
127114 /* If audit_rate_limit is non-zero, limit the rate of sending audit records
....@@ -136,9 +123,9 @@
136123 static u32	audit_backlog_wait_time = AUDIT_BACKLOG_WAIT_TIME;
137124 
138125 /* The identity of the user shutting down the audit system. */
139
-kuid_t		audit_sig_uid = INVALID_UID;
140
-pid_t		audit_sig_pid = -1;
141
-u32		audit_sig_sid = 0;
126
+static kuid_t		audit_sig_uid = INVALID_UID;
127
+static pid_t		audit_sig_pid = -1;
128
+static u32		audit_sig_sid;
142129 
143130 /* Records can be lost in several ways:
144131    0) [suppressed in audit_alloc]
....@@ -148,6 +135,11 @@
148135    4) suppressed due to audit_backlog_limit
149136 */
150137 static atomic_t	audit_lost = ATOMIC_INIT(0);
138
+
139
+/* Monotonically increasing sum of time the kernel has spent
140
+ * waiting while the backlog limit is exceeded.
141
+ */
142
+static atomic_t audit_backlog_wait_time_actual = ATOMIC_INIT(0);
151143 
152144 /* Hash for inode-based rules */
153145 struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
....@@ -397,10 +389,10 @@
397389 	struct audit_buffer *ab;
398390 	int rc = 0;
399391 
400
-	ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
392
+	ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_CONFIG_CHANGE);
401393 	if (unlikely(!ab))
402394 		return rc;
403
-	audit_log_format(ab, "%s=%u old=%u", function_name, new, old);
395
+	audit_log_format(ab, "op=set %s=%u old=%u ", function_name, new, old);
404396 	audit_log_session_info(ab);
405397 	rc = audit_log_task_context(ab);
406398 	if (rc)
....@@ -866,7 +858,7 @@
866858 		rc = kauditd_send_queue(sk, portid,
867859 					&audit_hold_queue, UNICAST_RETRIES,
868860 					NULL, kauditd_rehold_skb);
869
-		if (ac && rc < 0) {
861
+		if (rc < 0) {
870862 			sk = NULL;
871863 			auditd_reset(ac);
872864 			goto main_queue;
....@@ -876,7 +868,7 @@
876868 		rc = kauditd_send_queue(sk, portid,
877869 					&audit_retry_queue, UNICAST_RETRIES,
878870 					NULL, kauditd_hold_skb);
879
-		if (ac && rc < 0) {
871
+		if (rc < 0) {
880872 			sk = NULL;
881873 			auditd_reset(ac);
882874 			goto main_queue;
....@@ -964,8 +956,7 @@
964956 	if (!reply)
965957 		return;
966958 
967
-	if (reply->skb)
968
-		kfree_skb(reply->skb);
959
+	kfree_skb(reply->skb);
969960 	if (reply->net)
970961 		put_net(reply->net);
971962 	kfree(reply);
....@@ -1084,7 +1075,8 @@
10841075 	return err;
10851076 }
10861077 
1087
-static void audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type)
1078
+static void audit_log_common_recv_msg(struct audit_context *context,
1079
+					struct audit_buffer **ab, u16 msg_type)
10881080 {
10891081 	uid_t uid = from_kuid(&init_user_ns, current_uid());
10901082 	pid_t pid = task_tgid_nr(current);
....@@ -1094,12 +1086,18 @@
10941086 		return;
10951087 	}
10961088 
1097
-	*ab = audit_log_start(NULL, GFP_KERNEL, msg_type);
1089
+	*ab = audit_log_start(context, GFP_KERNEL, msg_type);
10981090 	if (unlikely(!*ab))
10991091 		return;
1100
-	audit_log_format(*ab, "pid=%d uid=%u", pid, uid);
1092
+	audit_log_format(*ab, "pid=%d uid=%u ", pid, uid);
11011093 	audit_log_session_info(*ab);
11021094 	audit_log_task_context(*ab);
1095
+}
1096
+
1097
+static inline void audit_log_user_recv_msg(struct audit_buffer **ab,
1098
+					   u16 msg_type)
1099
+{
1100
+	audit_log_common_recv_msg(NULL, ab, msg_type);
11031101 }
11041102 
11051103 int is_audit_feature_set(int i)
....@@ -1126,10 +1124,11 @@
11261124 
11271125 	if (audit_enabled == AUDIT_OFF)
11281126 		return;
1127
+
11291128 	ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_FEATURE_CHANGE);
11301129 	if (!ab)
11311130 		return;
1132
-	audit_log_task_info(ab, current);
1131
+	audit_log_task_info(ab);
11331132 	audit_log_format(ab, " feature=%s old=%u new=%u old_lock=%u new_lock=%u res=%d",
11341133 			 audit_feature_names[which], !!old_feature, !!new_feature,
11351134 			 !!old_lock, !!new_lock, res);
....@@ -1228,17 +1227,18 @@
12281227 	case AUDIT_GET: {
12291228 		struct audit_status	s;
12301229 		memset(&s, 0, sizeof(s));
1231
-		s.enabled		= audit_enabled;
1232
-		s.failure		= audit_failure;
1230
+		s.enabled		   = audit_enabled;
1231
+		s.failure		   = audit_failure;
12331232 		/* NOTE: use pid_vnr() so the PID is relative to the current
12341233 		 *       namespace */
1235
-		s.pid			= auditd_pid_vnr();
1236
-		s.rate_limit		= audit_rate_limit;
1237
-		s.backlog_limit		= audit_backlog_limit;
1238
-		s.lost			= atomic_read(&audit_lost);
1239
-		s.backlog		= skb_queue_len(&audit_queue);
1240
-		s.feature_bitmap	= AUDIT_FEATURE_BITMAP_ALL;
1241
-		s.backlog_wait_time	= audit_backlog_wait_time;
1234
+		s.pid			   = auditd_pid_vnr();
1235
+		s.rate_limit		   = audit_rate_limit;
1236
+		s.backlog_limit		   = audit_backlog_limit;
1237
+		s.lost			   = atomic_read(&audit_lost);
1238
+		s.backlog		   = skb_queue_len(&audit_queue);
1239
+		s.feature_bitmap	   = AUDIT_FEATURE_BITMAP_ALL;
1240
+		s.backlog_wait_time	   = audit_backlog_wait_time;
1241
+		s.backlog_wait_time_actual = atomic_read(&audit_backlog_wait_time_actual);
12421242 		audit_send_reply(skb, seq, AUDIT_GET, 0, 0, &s, sizeof(s));
12431243 		break;
12441244 	}
....@@ -1342,6 +1342,12 @@
13421342 			audit_log_config_change("lost", 0, lost, 1);
13431343 			return lost;
13441344 		}
1345
+		if (s.mask == AUDIT_STATUS_BACKLOG_WAIT_TIME_ACTUAL) {
1346
+			u32 actual = atomic_xchg(&audit_backlog_wait_time_actual, 0);
1347
+
1348
+			audit_log_config_change("backlog_wait_time_actual", 0, actual, 1);
1349
+			return actual;
1350
+		}
13451351 		break;
13461352 	}
13471353 	case AUDIT_GET_FEATURE:
....@@ -1375,7 +1381,7 @@
13751381 				if (err)
13761382 					break;
13771383 			}
1378
-			audit_log_common_recv_msg(&ab, msg_type);
1384
+			audit_log_user_recv_msg(&ab, msg_type);
13791385 			if (msg_type != AUDIT_USER_TTY) {
13801386 				/* ensure NULL termination */
13811387 				str[data_len - 1] = '\0';
....@@ -1396,8 +1402,12 @@
13961402 		if (data_len < sizeof(struct audit_rule_data))
13971403 			return -EINVAL;
13981404 		if (audit_enabled == AUDIT_LOCKED) {
1399
-			audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
1400
-			audit_log_format(ab, " audit_enabled=%d res=0", audit_enabled);
1405
+			audit_log_common_recv_msg(audit_context(), &ab,
1406
+						  AUDIT_CONFIG_CHANGE);
1407
+			audit_log_format(ab, " op=%s audit_enabled=%d res=0",
1408
+					 msg_type == AUDIT_ADD_RULE ?
1409
+						"add_rule" : "remove_rule",
1410
+					 audit_enabled);
14011411 			audit_log_end(ab);
14021412 			return -EPERM;
14031413 		}
....@@ -1408,7 +1418,8 @@
14081418 		break;
14091419 	case AUDIT_TRIM:
14101420 		audit_trim_trees();
1411
-		audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
1421
+		audit_log_common_recv_msg(audit_context(), &ab,
1422
+					  AUDIT_CONFIG_CHANGE);
14121423 		audit_log_format(ab, " op=trim res=1");
14131424 		audit_log_end(ab);
14141425 		break;
....@@ -1438,8 +1449,8 @@
14381449 		/* OK, here comes... */
14391450 		err = audit_tag_tree(old, new);
14401451 
1441
-		audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
1442
-
1452
+		audit_log_common_recv_msg(audit_context(), &ab,
1453
+					  AUDIT_CONFIG_CHANGE);
14431454 		audit_log_format(ab, " op=make_equiv old=");
14441455 		audit_log_untrustedstring(ab, old);
14451456 		audit_log_format(ab, " new=");
....@@ -1506,7 +1517,8 @@
15061517 		old.enabled = t & AUDIT_TTY_ENABLE;
15071518 		old.log_passwd = !!(t & AUDIT_TTY_LOG_PASSWD);
15081519 
1509
-		audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
1520
+		audit_log_common_recv_msg(audit_context(), &ab,
1521
+					  AUDIT_CONFIG_CHANGE);
15101522 		audit_log_format(ab, " op=tty_set old-enabled=%d new-enabled=%d"
15111523 				 " old-log_passwd=%d new-log_passwd=%d res=%d",
15121524 				 old.enabled, s.enabled, old.log_passwd,
....@@ -1568,20 +1580,60 @@
15681580 	}
15691581 }
15701582 
1571
-/* Run custom bind function on netlink socket group connect or bind requests. */
1572
-static int audit_bind(struct net *net, int group)
1583
+/* Log information about who is connecting to the audit multicast socket */
1584
+static void audit_log_multicast(int group, const char *op, int err)
15731585 {
1574
-	if (!capable(CAP_AUDIT_READ))
1575
-		return -EPERM;
1586
+	const struct cred *cred;
1587
+	struct tty_struct *tty;
1588
+	char comm[sizeof(current->comm)];
1589
+	struct audit_buffer *ab;
15761590 
1577
-	return 0;
1591
+	if (!audit_enabled)
1592
+		return;
1593
+
1594
+	ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_EVENT_LISTENER);
1595
+	if (!ab)
1596
+		return;
1597
+
1598
+	cred = current_cred();
1599
+	tty = audit_get_tty();
1600
+	audit_log_format(ab, "pid=%u uid=%u auid=%u tty=%s ses=%u",
1601
+			 task_pid_nr(current),
1602
+			 from_kuid(&init_user_ns, cred->uid),
1603
+			 from_kuid(&init_user_ns, audit_get_loginuid(current)),
1604
+			 tty ? tty_name(tty) : "(none)",
1605
+			 audit_get_sessionid(current));
1606
+	audit_put_tty(tty);
1607
+	audit_log_task_context(ab); /* subj= */
1608
+	audit_log_format(ab, " comm=");
1609
+	audit_log_untrustedstring(ab, get_task_comm(comm, current));
1610
+	audit_log_d_path_exe(ab, current->mm); /* exe= */
1611
+	audit_log_format(ab, " nl-mcgrp=%d op=%s res=%d", group, op, !err);
1612
+	audit_log_end(ab);
1613
+}
1614
+
1615
+/* Run custom bind function on netlink socket group connect or bind requests. */
1616
+static int audit_multicast_bind(struct net *net, int group)
1617
+{
1618
+	int err = 0;
1619
+
1620
+	if (!capable(CAP_AUDIT_READ))
1621
+		err = -EPERM;
1622
+	audit_log_multicast(group, "connect", err);
1623
+	return err;
1624
+}
1625
+
1626
+static void audit_multicast_unbind(struct net *net, int group)
1627
+{
1628
+	audit_log_multicast(group, "disconnect", 0);
15781629 }
15791630 
15801631 static int __net_init audit_net_init(struct net *net)
15811632 {
15821633 	struct netlink_kernel_cfg cfg = {
15831634 		.input	= audit_receive,
1584
-		.bind	= audit_bind,
1635
+		.bind	= audit_multicast_bind,
1636
+		.unbind	= audit_multicast_unbind,
15851637 		.flags	= NL_CFG_F_NONROOT_RECV,
15861638 		.groups	= AUDIT_NLGRP_MAX,
15871639 	};
....@@ -1796,7 +1848,7 @@
17961848 {
17971849 	struct audit_buffer *ab;
17981850 	struct timespec64 t;
1799
-	unsigned int uninitialized_var(serial);
1851
+	unsigned int serial;
18001852 
18011853 	if (audit_initialized != AUDIT_INITIALIZED)
18021854 		return NULL;
....@@ -1824,12 +1876,15 @@
18241876 			/* sleep if we are allowed and we haven't exhausted our
18251877 			 * backlog wait limit */
18261878 			if (gfpflags_allow_blocking(gfp_mask) && (stime > 0)) {
1879
+				long rtime = stime;
1880
+
18271881 				DECLARE_WAITQUEUE(wait, current);
18281882 
18291883 				add_wait_queue_exclusive(&audit_backlog_wait,
18301884 							 &wait);
18311885 				set_current_state(TASK_UNINTERRUPTIBLE);
1832
-				stime = schedule_timeout(stime);
1886
+				stime = schedule_timeout(rtime);
1887
+				atomic_add(rtime - stime, &audit_backlog_wait_time_actual);
18331888 				remove_wait_queue(&audit_backlog_wait, &wait);
18341889 			} else {
18351890 				if (audit_rate_check() && printk_ratelimit())
....@@ -2077,13 +2132,13 @@
20772132 	/* We will allow 11 spaces for ' (deleted)' to be appended */
20782133 	pathname = kmalloc(PATH_MAX+11, ab->gfp_mask);
20792134 	if (!pathname) {
2080
-		audit_log_string(ab, "<no_memory>");
2135
+		audit_log_format(ab, "\"<no_memory>\"");
20812136 		return;
20822137 	}
20832138 	p = d_path(path, pathname, PATH_MAX+11);
20842139 	if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */
20852140 		/* FIXME: can we save some information here? */
2086
-		audit_log_string(ab, "<too_long>");
2141
+		audit_log_format(ab, "\"<too_long>\"");
20872142 	} else
20882143 		audit_log_untrustedstring(ab, p);
20892144 	kfree(pathname);
....@@ -2094,7 +2149,7 @@
20942149 	unsigned int sessionid = audit_get_sessionid(current);
20952150 	uid_t auid = from_kuid(&init_user_ns, audit_get_loginuid(current));
20962151 
2097
-	audit_log_format(ab, " auid=%u ses=%u", auid, sessionid);
2152
+	audit_log_format(ab, "auid=%u ses=%u", auid, sessionid);
20982153 }
20992154 
21002155 void audit_log_key(struct audit_buffer *ab, char *key)
....@@ -2104,152 +2159,6 @@
21042159 		audit_log_untrustedstring(ab, key);
21052160 	else
21062161 		audit_log_format(ab, "(null)");
2107
-}
2108
-
2109
-void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap)
2110
-{
2111
-	int i;
2112
-
2113
-	audit_log_format(ab, " %s=", prefix);
2114
-	CAP_FOR_EACH_U32(i) {
2115
-		audit_log_format(ab, "%08x",
2116
-				 cap->cap[CAP_LAST_U32 - i]);
2117
-	}
2118
-}
2119
-
2120
-static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
2121
-{
2122
-	audit_log_cap(ab, "cap_fp", &name->fcap.permitted);
2123
-	audit_log_cap(ab, "cap_fi", &name->fcap.inheritable);
2124
-	audit_log_format(ab, " cap_fe=%d cap_fver=%x",
2125
-			 name->fcap.fE, name->fcap_ver);
2126
-}
2127
-
2128
-static inline int audit_copy_fcaps(struct audit_names *name,
2129
-				   const struct dentry *dentry)
2130
-{
2131
-	struct cpu_vfs_cap_data caps;
2132
-	int rc;
2133
-
2134
-	if (!dentry)
2135
-		return 0;
2136
-
2137
-	rc = get_vfs_caps_from_disk(dentry, &caps);
2138
-	if (rc)
2139
-		return rc;
2140
-
2141
-	name->fcap.permitted = caps.permitted;
2142
-	name->fcap.inheritable = caps.inheritable;
2143
-	name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
2144
-	name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >>
2145
-				VFS_CAP_REVISION_SHIFT;
2146
-
2147
-	return 0;
2148
-}
2149
-
2150
-/* Copy inode data into an audit_names. */
2151
-void audit_copy_inode(struct audit_names *name, const struct dentry *dentry,
2152
-		      struct inode *inode)
2153
-{
2154
-	name->ino   = inode->i_ino;
2155
-	name->dev   = inode->i_sb->s_dev;
2156
-	name->mode  = inode->i_mode;
2157
-	name->uid   = inode->i_uid;
2158
-	name->gid   = inode->i_gid;
2159
-	name->rdev  = inode->i_rdev;
2160
-	security_inode_getsecid(inode, &name->osid);
2161
-	audit_copy_fcaps(name, dentry);
2162
-}
2163
-
2164
-/**
2165
- * audit_log_name - produce AUDIT_PATH record from struct audit_names
2166
- * @context: audit_context for the task
2167
- * @n: audit_names structure with reportable details
2168
- * @path: optional path to report instead of audit_names->name
2169
- * @record_num: record number to report when handling a list of names
2170
- * @call_panic: optional pointer to int that will be updated if secid fails
2171
- */
2172
-void audit_log_name(struct audit_context *context, struct audit_names *n,
2173
-		    const struct path *path, int record_num, int *call_panic)
2174
-{
2175
-	struct audit_buffer *ab;
2176
-	ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH);
2177
-	if (!ab)
2178
-		return;
2179
-
2180
-	audit_log_format(ab, "item=%d", record_num);
2181
-
2182
-	if (path)
2183
-		audit_log_d_path(ab, " name=", path);
2184
-	else if (n->name) {
2185
-		switch (n->name_len) {
2186
-		case AUDIT_NAME_FULL:
2187
-			/* log the full path */
2188
-			audit_log_format(ab, " name=");
2189
-			audit_log_untrustedstring(ab, n->name->name);
2190
-			break;
2191
-		case 0:
2192
-			/* name was specified as a relative path and the
2193
-			 * directory component is the cwd */
2194
-			audit_log_d_path(ab, " name=", &context->pwd);
2195
-			break;
2196
-		default:
2197
-			/* log the name's directory component */
2198
-			audit_log_format(ab, " name=");
2199
-			audit_log_n_untrustedstring(ab, n->name->name,
2200
-						    n->name_len);
2201
-		}
2202
-	} else
2203
-		audit_log_format(ab, " name=(null)");
2204
-
2205
-	if (n->ino != AUDIT_INO_UNSET)
2206
-		audit_log_format(ab, " inode=%lu"
2207
-				 " dev=%02x:%02x mode=%#ho"
2208
-				 " ouid=%u ogid=%u rdev=%02x:%02x",
2209
-				 n->ino,
2210
-				 MAJOR(n->dev),
2211
-				 MINOR(n->dev),
2212
-				 n->mode,
2213
-				 from_kuid(&init_user_ns, n->uid),
2214
-				 from_kgid(&init_user_ns, n->gid),
2215
-				 MAJOR(n->rdev),
2216
-				 MINOR(n->rdev));
2217
-	if (n->osid != 0) {
2218
-		char *ctx = NULL;
2219
-		u32 len;
2220
-		if (security_secid_to_secctx(
2221
-			n->osid, &ctx, &len)) {
2222
-			audit_log_format(ab, " osid=%u", n->osid);
2223
-			if (call_panic)
2224
-				*call_panic = 2;
2225
-		} else {
2226
-			audit_log_format(ab, " obj=%s", ctx);
2227
-			security_release_secctx(ctx, len);
2228
-		}
2229
-	}
2230
-
2231
-	/* log the audit_names record type */
2232
-	audit_log_format(ab, " nametype=");
2233
-	switch(n->type) {
2234
-	case AUDIT_TYPE_NORMAL:
2235
-		audit_log_format(ab, "NORMAL");
2236
-		break;
2237
-	case AUDIT_TYPE_PARENT:
2238
-		audit_log_format(ab, "PARENT");
2239
-		break;
2240
-	case AUDIT_TYPE_CHILD_DELETE:
2241
-		audit_log_format(ab, "DELETE");
2242
-		break;
2243
-	case AUDIT_TYPE_CHILD_CREATE:
2244
-		audit_log_format(ab, "CREATE");
2245
-		break;
2246
-	default:
2247
-		audit_log_format(ab, "UNKNOWN");
2248
-		break;
2249
-	}
2250
-
2251
-	audit_log_fcaps(ab, n);
2252
-	audit_log_end(ab);
22532162 }
22542163 
22552164 int audit_log_task_context(struct audit_buffer *ab)
....@@ -2299,15 +2208,15 @@
22992208 	audit_log_format(ab, " exe=(null)");
23002209 }
23012210 
2302
-struct tty_struct *audit_get_tty(struct task_struct *tsk)
2211
+struct tty_struct *audit_get_tty(void)
23032212 {
23042213 	struct tty_struct *tty = NULL;
23052214 	unsigned long flags;
23062215 
2307
-	spin_lock_irqsave(&tsk->sighand->siglock, flags);
2308
-	if (tsk->signal)
2309
-		tty = tty_kref_get(tsk->signal->tty);
2310
-	spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
2216
+	spin_lock_irqsave(&current->sighand->siglock, flags);
2217
+	if (current->signal)
2218
+		tty = tty_kref_get(current->signal->tty);
2219
+	spin_unlock_irqrestore(&current->sighand->siglock, flags);
23112220 	return tty;
23122221 }
23132222 
....@@ -2316,25 +2225,24 @@
23162225 	tty_kref_put(tty);
23172226 }
23182227 
2319
-void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk)
2228
+void audit_log_task_info(struct audit_buffer *ab)
23202229 {
23212230 	const struct cred *cred;
2322
-	char comm[sizeof(tsk->comm)];
2231
+	char comm[sizeof(current->comm)];
23232232 	struct tty_struct *tty;
23242233 
23252234 	if (!ab)
23262235 		return;
23272236 
2328
-	/* tsk == current */
23292237 	cred = current_cred();
2330
-	tty = audit_get_tty(tsk);
2238
+	tty = audit_get_tty();
23312239 	audit_log_format(ab,
23322240 			 " ppid=%d pid=%d auid=%u uid=%u gid=%u"
23332241 			 " euid=%u suid=%u fsuid=%u"
23342242 			 " egid=%u sgid=%u fsgid=%u tty=%s ses=%u",
2335
-			 task_ppid_nr(tsk),
2336
-			 task_tgid_nr(tsk),
2337
-			 from_kuid(&init_user_ns, audit_get_loginuid(tsk)),
2243
+			 task_ppid_nr(current),
2244
+			 task_tgid_nr(current),
2245
+			 from_kuid(&init_user_ns, audit_get_loginuid(current)),
23382246 			 from_kuid(&init_user_ns, cred->uid),
23392247 			 from_kgid(&init_user_ns, cred->gid),
23402248 			 from_kuid(&init_user_ns, cred->euid),
....@@ -2344,36 +2252,149 @@
23442252 			 from_kgid(&init_user_ns, cred->sgid),
23452253 			 from_kgid(&init_user_ns, cred->fsgid),
23462254 			 tty ? tty_name(tty) : "(none)",
2347
-			 audit_get_sessionid(tsk));
2255
+			 audit_get_sessionid(current));
23482256 	audit_put_tty(tty);
23492257 	audit_log_format(ab, " comm=");
2350
-	audit_log_untrustedstring(ab, get_task_comm(comm, tsk));
2351
-	audit_log_d_path_exe(ab, tsk->mm);
2258
+	audit_log_untrustedstring(ab, get_task_comm(comm, current));
2259
+	audit_log_d_path_exe(ab, current->mm);
23522260 	audit_log_task_context(ab);
23532261 }
23542262 EXPORT_SYMBOL(audit_log_task_info);
23552263 
23562264 /**
2357
- * audit_log_link_denied - report a link restriction denial
2358
- * @operation: specific link operation
2265
+ * audit_log_path_denied - report a path restriction denial
2266
+ * @type: audit message type (AUDIT_ANOM_LINK, AUDIT_ANOM_CREAT, etc)
2267
+ * @operation: specific operation name
23592268  */
2360
-void audit_log_link_denied(const char *operation)
2269
+void audit_log_path_denied(int type, const char *operation)
23612270 {
23622271 	struct audit_buffer *ab;
23632272 
23642273 	if (!audit_enabled || audit_dummy_context())
23652274 		return;
23662275 
2367
-	/* Generate AUDIT_ANOM_LINK with subject, operation, outcome. */
2368
-	ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_ANOM_LINK);
2276
+	/* Generate log with subject, operation, outcome. */
2277
+	ab = audit_log_start(audit_context(), GFP_KERNEL, type);
23692278 	if (!ab)
23702279 		return;
23712280 	audit_log_format(ab, "op=%s", operation);
2372
-	audit_log_task_info(ab, current);
2281
+	audit_log_task_info(ab);
23732282 	audit_log_format(ab, " res=0");
23742283 	audit_log_end(ab);
23752284 }
23762285 
2286
+/* global counter which is incremented every time something logs in */
2287
+static atomic_t session_id = ATOMIC_INIT(0);
2288
+
2289
+static int audit_set_loginuid_perm(kuid_t loginuid)
2290
+{
2291
+	/* if we are unset, we don't need privs */
2292
+	if (!audit_loginuid_set(current))
2293
+		return 0;
2294
+	/* if AUDIT_FEATURE_LOGINUID_IMMUTABLE means never ever allow a change*/
2295
+	if (is_audit_feature_set(AUDIT_FEATURE_LOGINUID_IMMUTABLE))
2296
+		return -EPERM;
2297
+	/* it is set, you need permission */
2298
+	if (!capable(CAP_AUDIT_CONTROL))
2299
+		return -EPERM;
2300
+	/* reject if this is not an unset and we don't allow that */
2301
+	if (is_audit_feature_set(AUDIT_FEATURE_ONLY_UNSET_LOGINUID)
2302
+				 && uid_valid(loginuid))
2303
+		return -EPERM;
2304
+	return 0;
2305
+}
2306
+
2307
+static void audit_log_set_loginuid(kuid_t koldloginuid, kuid_t kloginuid,
2308
+				   unsigned int oldsessionid,
2309
+				   unsigned int sessionid, int rc)
2310
+{
2311
+	struct audit_buffer *ab;
2312
+	uid_t uid, oldloginuid, loginuid;
2313
+	struct tty_struct *tty;
2314
+
2315
+	if (!audit_enabled)
2316
+		return;
2317
+
2318
+	ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_LOGIN);
2319
+	if (!ab)
2320
+		return;
2321
+
2322
+	uid = from_kuid(&init_user_ns, task_uid(current));
2323
+	oldloginuid = from_kuid(&init_user_ns, koldloginuid);
2324
+	loginuid = from_kuid(&init_user_ns, kloginuid),
2325
+	tty = audit_get_tty();
2326
+
2327
+	audit_log_format(ab, "pid=%d uid=%u", task_tgid_nr(current), uid);
2328
+	audit_log_task_context(ab);
2329
+	audit_log_format(ab, " old-auid=%u auid=%u tty=%s old-ses=%u ses=%u res=%d",
2330
+			 oldloginuid, loginuid, tty ? tty_name(tty) : "(none)",
2331
+			 oldsessionid, sessionid, !rc);
2332
+	audit_put_tty(tty);
2333
+	audit_log_end(ab);
2334
+}
2335
+
2336
+/**
2337
+ * audit_set_loginuid - set current task's loginuid
2338
+ * @loginuid: loginuid value
2339
+ *
2340
+ * Returns 0.
2341
+ *
2342
+ * Called (set) from fs/proc/base.c::proc_loginuid_write().
2343
+ */
2344
+int audit_set_loginuid(kuid_t loginuid)
2345
+{
2346
+	unsigned int oldsessionid, sessionid = AUDIT_SID_UNSET;
2347
+	kuid_t oldloginuid;
2348
+	int rc;
2349
+
2350
+	oldloginuid = audit_get_loginuid(current);
2351
+	oldsessionid = audit_get_sessionid(current);
2352
+
2353
+	rc = audit_set_loginuid_perm(loginuid);
2354
+	if (rc)
2355
+		goto out;
2356
+
2357
+	/* are we setting or clearing? */
2358
+	if (uid_valid(loginuid)) {
2359
+		sessionid = (unsigned int)atomic_inc_return(&session_id);
2360
+		if (unlikely(sessionid == AUDIT_SID_UNSET))
2361
+			sessionid = (unsigned int)atomic_inc_return(&session_id);
2362
+	}
2363
+
2364
+	current->sessionid = sessionid;
2365
+	current->loginuid = loginuid;
2366
+out:
2367
+	audit_log_set_loginuid(oldloginuid, loginuid, oldsessionid, sessionid, rc);
2368
+	return rc;
2369
+}
2370
+
2371
+/**
2372
+ * audit_signal_info - record signal info for shutting down audit subsystem
2373
+ * @sig: signal value
2374
+ * @t: task being signaled
2375
+ *
2376
+ * If the audit subsystem is being terminated, record the task (pid)
2377
+ * and uid that is doing that.
2378
+ */
2379
+int audit_signal_info(int sig, struct task_struct *t)
2380
+{
2381
+	kuid_t uid = current_uid(), auid;
2382
+
2383
+	if (auditd_test_task(t) &&
2384
+	    (sig == SIGTERM || sig == SIGHUP ||
2385
+	     sig == SIGUSR1 || sig == SIGUSR2)) {
2386
+		audit_sig_pid = task_tgid_nr(current);
2387
+		auid = audit_get_loginuid(current);
2388
+		if (uid_valid(auid))
2389
+			audit_sig_uid = auid;
2390
+		else
2391
+			audit_sig_uid = uid;
2392
+		security_task_getsecid(current, &audit_sig_sid);
2393
+	}
2394
+
2395
+	return audit_signal_info_syscall(t);
2396
+}
2397
+
23772398 /**
23782399  * audit_log_end - end one audit record
23792400  * @ab: the audit_buffer