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Commit fcaf1eb8685a00a99259e138e403841e984385b0

Authored by Andrew Morton
Committed by Al Viro
1 parent 6ee650467d
Exists in master and in 39 other branches 8mp-imx_5.4.70_2.3.0, 8qm-imx_5.4.70_2.3.0, emb_imx_lf-5.15.y, emb_lf-6.1.y, imx_3.0.35_4.1.0, imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, imx_4.1.15_1.0.0_ga, pitx_8mp_lf-5.10.y, rt-smarc-imx_4.1.15_1.0.0_ga, rt_linux_5.15.71, smarc-8m-android-11.0.0_2.0.0, smarc-imx6_4.14.98_2.0.0_ga, smarc-imx6_4.9.88_2.0.0_ga, smarc-imx7_4.14.98_2.0.0_ga, smarc-imx7_4.9.11_1.0.0_ga, smarc-imx7_4.9.88_2.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga, smarc-imx_4.1.15_1.0.0_ga, smarc-imx_4.9.11_1.0.0_ga, smarc-imx_4.9.51_imx8m_ga, smarc-imx_4.9.88_2.0.0_ga, smarc-m6.0.1_2.1.0-ga, smarc-n7.1.2_2.0.0-ga, smarc-rel_imx_4.1.15_1.2.0_ga, smarc_8m_00d0_imx_4.14.98_2.0.0_ga, smarc_8m_imx_4.14.78_1.0.0_ga, smarc_8m_imx_4.14.98_2.0.0_ga, smarc_8m_imx_4.19.35_1.1.0, smarc_8mm_imx_4.14.78_1.0.0_ga, smarc_8mm_imx_4.14.98_2.0.0_ga, smarc_8mm_imx_4.19.35_1.1.0, smarc_8mm_imx_5.4.24_2.1.0, smarc_8mp_lf-5.10.y, smarc_8mq_imx_5.4.24_2.1.0, smarc_8mq_lf-5.10.y, smarc_imx_lf-5.15.y

[patch 1/1] audit_send_reply(): fix error-path memory leak 

Addresses http://bugzilla.kernel.org/show_bug.cgi?id=10663

Reporter: Daniel Marjamki <danielm77@spray.se>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Showing 1 changed file with 6 additions and 5 deletions Inline Diff

1 /* audit.c -- Auditing support 1 /* audit.c -- Auditing support
2 * Gateway between the kernel (e.g., selinux) and the user-space audit daemon. 2 * Gateway between the kernel (e.g., selinux) and the user-space audit daemon.
3 * System-call specific features have moved to auditsc.c 3 * System-call specific features have moved to auditsc.c
4 * 4 *
5 * Copyright 2003-2007 Red Hat Inc., Durham, North Carolina. 5 * Copyright 2003-2007 Red Hat Inc., Durham, North Carolina.
6 * All Rights Reserved. 6 * All Rights Reserved.
7 * 7 *
8 * This program is free software; you can redistribute it and/or modify 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 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 10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version. 11 * (at your option) any later version.
12 * 12 *
13 * This program is distributed in the hope that it will be useful, 13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details. 16 * GNU General Public License for more details.
17 * 17 *
18 * You should have received a copy of the GNU General Public License 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 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 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 * 21 *
22 * Written by Rickard E. (Rik) Faith <faith@redhat.com> 22 * Written by Rickard E. (Rik) Faith <faith@redhat.com>
23 * 23 *
24 * Goals: 1) Integrate fully with Security Modules. 24 * Goals: 1) Integrate fully with Security Modules.
25 * 2) Minimal run-time overhead: 25 * 2) Minimal run-time overhead:
26 * a) Minimal when syscall auditing is disabled (audit_enable=0). 26 * a) Minimal when syscall auditing is disabled (audit_enable=0).
27 * b) Small when syscall auditing is enabled and no audit record 27 * b) Small when syscall auditing is enabled and no audit record
28 * is generated (defer as much work as possible to record 28 * is generated (defer as much work as possible to record
29 * generation time): 29 * generation time):
30 * i) context is allocated, 30 * i) context is allocated,
31 * ii) names from getname are stored without a copy, and 31 * ii) names from getname are stored without a copy, and
32 * iii) inode information stored from path_lookup. 32 * iii) inode information stored from path_lookup.
33 * 3) Ability to disable syscall auditing at boot time (audit=0). 33 * 3) Ability to disable syscall auditing at boot time (audit=0).
34 * 4) Usable by other parts of the kernel (if audit_log* is called, 34 * 4) Usable by other parts of the kernel (if audit_log* is called,
35 * then a syscall record will be generated automatically for the 35 * then a syscall record will be generated automatically for the
36 * current syscall). 36 * current syscall).
37 * 5) Netlink interface to user-space. 37 * 5) Netlink interface to user-space.
38 * 6) Support low-overhead kernel-based filtering to minimize the 38 * 6) Support low-overhead kernel-based filtering to minimize the
39 * information that must be passed to user-space. 39 * information that must be passed to user-space.
40 * 40 *
41 * Example user-space utilities: http://people.redhat.com/sgrubb/audit/ 41 * Example user-space utilities: http://people.redhat.com/sgrubb/audit/
42 */ 42 */
43 43
44 #include <linux/init.h> 44 #include <linux/init.h>
45 #include <asm/types.h> 45 #include <asm/types.h>
46 #include <asm/atomic.h> 46 #include <asm/atomic.h>
47 #include <linux/mm.h> 47 #include <linux/mm.h>
48 #include <linux/module.h> 48 #include <linux/module.h>
49 #include <linux/err.h> 49 #include <linux/err.h>
50 #include <linux/kthread.h> 50 #include <linux/kthread.h>
51 51
52 #include <linux/audit.h> 52 #include <linux/audit.h>
53 53
54 #include <net/sock.h> 54 #include <net/sock.h>
55 #include <net/netlink.h> 55 #include <net/netlink.h>
56 #include <linux/skbuff.h> 56 #include <linux/skbuff.h>
57 #include <linux/netlink.h> 57 #include <linux/netlink.h>
58 #include <linux/inotify.h> 58 #include <linux/inotify.h>
59 #include <linux/freezer.h> 59 #include <linux/freezer.h>
60 #include <linux/tty.h> 60 #include <linux/tty.h>
61 61
62 #include "audit.h" 62 #include "audit.h"
63 63
64 /* No auditing will take place until audit_initialized != 0. 64 /* No auditing will take place until audit_initialized != 0.
65 * (Initialization happens after skb_init is called.) */ 65 * (Initialization happens after skb_init is called.) */
66 static int audit_initialized; 66 static int audit_initialized;
67 67
68 #define AUDIT_OFF 0 68 #define AUDIT_OFF 0
69 #define AUDIT_ON 1 69 #define AUDIT_ON 1
70 #define AUDIT_LOCKED 2 70 #define AUDIT_LOCKED 2
71 int audit_enabled; 71 int audit_enabled;
72 int audit_ever_enabled; 72 int audit_ever_enabled;
73 73
74 /* Default state when kernel boots without any parameters. */ 74 /* Default state when kernel boots without any parameters. */
75 static int audit_default; 75 static int audit_default;
76 76
77 /* If auditing cannot proceed, audit_failure selects what happens. */ 77 /* If auditing cannot proceed, audit_failure selects what happens. */
78 static int audit_failure = AUDIT_FAIL_PRINTK; 78 static int audit_failure = AUDIT_FAIL_PRINTK;
79 79
80 /* 80 /*
81 * If audit records are to be written to the netlink socket, audit_pid 81 * If audit records are to be written to the netlink socket, audit_pid
82 * contains the pid of the auditd process and audit_nlk_pid contains 82 * contains the pid of the auditd process and audit_nlk_pid contains
83 * the pid to use to send netlink messages to that process. 83 * the pid to use to send netlink messages to that process.
84 */ 84 */
85 int audit_pid; 85 int audit_pid;
86 static int audit_nlk_pid; 86 static int audit_nlk_pid;
87 87
88 /* If audit_rate_limit is non-zero, limit the rate of sending audit records 88 /* If audit_rate_limit is non-zero, limit the rate of sending audit records
89 * to that number per second. This prevents DoS attacks, but results in 89 * to that number per second. This prevents DoS attacks, but results in
90 * audit records being dropped. */ 90 * audit records being dropped. */
91 static int audit_rate_limit; 91 static int audit_rate_limit;
92 92
93 /* Number of outstanding audit_buffers allowed. */ 93 /* Number of outstanding audit_buffers allowed. */
94 static int audit_backlog_limit = 64; 94 static int audit_backlog_limit = 64;
95 static int audit_backlog_wait_time = 60 * HZ; 95 static int audit_backlog_wait_time = 60 * HZ;
96 static int audit_backlog_wait_overflow = 0; 96 static int audit_backlog_wait_overflow = 0;
97 97
98 /* The identity of the user shutting down the audit system. */ 98 /* The identity of the user shutting down the audit system. */
99 uid_t audit_sig_uid = -1; 99 uid_t audit_sig_uid = -1;
100 pid_t audit_sig_pid = -1; 100 pid_t audit_sig_pid = -1;
101 u32 audit_sig_sid = 0; 101 u32 audit_sig_sid = 0;
102 102
103 /* Records can be lost in several ways: 103 /* Records can be lost in several ways:
104 0) [suppressed in audit_alloc] 104 0) [suppressed in audit_alloc]
105 1) out of memory in audit_log_start [kmalloc of struct audit_buffer] 105 1) out of memory in audit_log_start [kmalloc of struct audit_buffer]
106 2) out of memory in audit_log_move [alloc_skb] 106 2) out of memory in audit_log_move [alloc_skb]
107 3) suppressed due to audit_rate_limit 107 3) suppressed due to audit_rate_limit
108 4) suppressed due to audit_backlog_limit 108 4) suppressed due to audit_backlog_limit
109 */ 109 */
110 static atomic_t audit_lost = ATOMIC_INIT(0); 110 static atomic_t audit_lost = ATOMIC_INIT(0);
111 111
112 /* The netlink socket. */ 112 /* The netlink socket. */
113 static struct sock *audit_sock; 113 static struct sock *audit_sock;
114 114
115 /* Inotify handle. */ 115 /* Inotify handle. */
116 struct inotify_handle *audit_ih; 116 struct inotify_handle *audit_ih;
117 117
118 /* Hash for inode-based rules */ 118 /* Hash for inode-based rules */
119 struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS]; 119 struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
120 120
121 /* The audit_freelist is a list of pre-allocated audit buffers (if more 121 /* The audit_freelist is a list of pre-allocated audit buffers (if more
122 * than AUDIT_MAXFREE are in use, the audit buffer is freed instead of 122 * than AUDIT_MAXFREE are in use, the audit buffer is freed instead of
123 * being placed on the freelist). */ 123 * being placed on the freelist). */
124 static DEFINE_SPINLOCK(audit_freelist_lock); 124 static DEFINE_SPINLOCK(audit_freelist_lock);
125 static int audit_freelist_count; 125 static int audit_freelist_count;
126 static LIST_HEAD(audit_freelist); 126 static LIST_HEAD(audit_freelist);
127 127
128 static struct sk_buff_head audit_skb_queue; 128 static struct sk_buff_head audit_skb_queue;
129 /* queue of skbs to send to auditd when/if it comes back */ 129 /* queue of skbs to send to auditd when/if it comes back */
130 static struct sk_buff_head audit_skb_hold_queue; 130 static struct sk_buff_head audit_skb_hold_queue;
131 static struct task_struct *kauditd_task; 131 static struct task_struct *kauditd_task;
132 static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait); 132 static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait);
133 static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait); 133 static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait);
134 134
135 /* Serialize requests from userspace. */ 135 /* Serialize requests from userspace. */
136 static DEFINE_MUTEX(audit_cmd_mutex); 136 static DEFINE_MUTEX(audit_cmd_mutex);
137 137
138 /* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting 138 /* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting
139 * audit records. Since printk uses a 1024 byte buffer, this buffer 139 * audit records. Since printk uses a 1024 byte buffer, this buffer
140 * should be at least that large. */ 140 * should be at least that large. */
141 #define AUDIT_BUFSIZ 1024 141 #define AUDIT_BUFSIZ 1024
142 142
143 /* AUDIT_MAXFREE is the number of empty audit_buffers we keep on the 143 /* AUDIT_MAXFREE is the number of empty audit_buffers we keep on the
144 * audit_freelist. Doing so eliminates many kmalloc/kfree calls. */ 144 * audit_freelist. Doing so eliminates many kmalloc/kfree calls. */
145 #define AUDIT_MAXFREE (2*NR_CPUS) 145 #define AUDIT_MAXFREE (2*NR_CPUS)
146 146
147 /* The audit_buffer is used when formatting an audit record. The caller 147 /* The audit_buffer is used when formatting an audit record. The caller
148 * locks briefly to get the record off the freelist or to allocate the 148 * locks briefly to get the record off the freelist or to allocate the
149 * buffer, and locks briefly to send the buffer to the netlink layer or 149 * buffer, and locks briefly to send the buffer to the netlink layer or
150 * to place it on a transmit queue. Multiple audit_buffers can be in 150 * to place it on a transmit queue. Multiple audit_buffers can be in
151 * use simultaneously. */ 151 * use simultaneously. */
152 struct audit_buffer { 152 struct audit_buffer {
153 struct list_head list; 153 struct list_head list;
154 struct sk_buff *skb; /* formatted skb ready to send */ 154 struct sk_buff *skb; /* formatted skb ready to send */
155 struct audit_context *ctx; /* NULL or associated context */ 155 struct audit_context *ctx; /* NULL or associated context */
156 gfp_t gfp_mask; 156 gfp_t gfp_mask;
157 }; 157 };
158 158
159 struct audit_reply { 159 struct audit_reply {
160 int pid; 160 int pid;
161 struct sk_buff *skb; 161 struct sk_buff *skb;
162 }; 162 };
163 163
164 static void audit_set_pid(struct audit_buffer *ab, pid_t pid) 164 static void audit_set_pid(struct audit_buffer *ab, pid_t pid)
165 { 165 {
166 if (ab) { 166 if (ab) {
167 struct nlmsghdr *nlh = nlmsg_hdr(ab->skb); 167 struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
168 nlh->nlmsg_pid = pid; 168 nlh->nlmsg_pid = pid;
169 } 169 }
170 } 170 }
171 171
172 void audit_panic(const char *message) 172 void audit_panic(const char *message)
173 { 173 {
174 switch (audit_failure) 174 switch (audit_failure)
175 { 175 {
176 case AUDIT_FAIL_SILENT: 176 case AUDIT_FAIL_SILENT:
177 break; 177 break;
178 case AUDIT_FAIL_PRINTK: 178 case AUDIT_FAIL_PRINTK:
179 if (printk_ratelimit()) 179 if (printk_ratelimit())
180 printk(KERN_ERR "audit: %s\n", message); 180 printk(KERN_ERR "audit: %s\n", message);
181 break; 181 break;
182 case AUDIT_FAIL_PANIC: 182 case AUDIT_FAIL_PANIC:
183 /* test audit_pid since printk is always losey, why bother? */ 183 /* test audit_pid since printk is always losey, why bother? */
184 if (audit_pid) 184 if (audit_pid)
185 panic("audit: %s\n", message); 185 panic("audit: %s\n", message);
186 break; 186 break;
187 } 187 }
188 } 188 }
189 189
190 static inline int audit_rate_check(void) 190 static inline int audit_rate_check(void)
191 { 191 {
192 static unsigned long last_check = 0; 192 static unsigned long last_check = 0;
193 static int messages = 0; 193 static int messages = 0;
194 static DEFINE_SPINLOCK(lock); 194 static DEFINE_SPINLOCK(lock);
195 unsigned long flags; 195 unsigned long flags;
196 unsigned long now; 196 unsigned long now;
197 unsigned long elapsed; 197 unsigned long elapsed;
198 int retval = 0; 198 int retval = 0;
199 199
200 if (!audit_rate_limit) return 1; 200 if (!audit_rate_limit) return 1;
201 201
202 spin_lock_irqsave(&lock, flags); 202 spin_lock_irqsave(&lock, flags);
203 if (++messages < audit_rate_limit) { 203 if (++messages < audit_rate_limit) {
204 retval = 1; 204 retval = 1;
205 } else { 205 } else {
206 now = jiffies; 206 now = jiffies;
207 elapsed = now - last_check; 207 elapsed = now - last_check;
208 if (elapsed > HZ) { 208 if (elapsed > HZ) {
209 last_check = now; 209 last_check = now;
210 messages = 0; 210 messages = 0;
211 retval = 1; 211 retval = 1;
212 } 212 }
213 } 213 }
214 spin_unlock_irqrestore(&lock, flags); 214 spin_unlock_irqrestore(&lock, flags);
215 215
216 return retval; 216 return retval;
217 } 217 }
218 218
219 /** 219 /**
220 * audit_log_lost - conditionally log lost audit message event 220 * audit_log_lost - conditionally log lost audit message event
221 * @message: the message stating reason for lost audit message 221 * @message: the message stating reason for lost audit message
222 * 222 *
223 * Emit at least 1 message per second, even if audit_rate_check is 223 * Emit at least 1 message per second, even if audit_rate_check is
224 * throttling. 224 * throttling.
225 * Always increment the lost messages counter. 225 * Always increment the lost messages counter.
226 */ 226 */
227 void audit_log_lost(const char *message) 227 void audit_log_lost(const char *message)
228 { 228 {
229 static unsigned long last_msg = 0; 229 static unsigned long last_msg = 0;
230 static DEFINE_SPINLOCK(lock); 230 static DEFINE_SPINLOCK(lock);
231 unsigned long flags; 231 unsigned long flags;
232 unsigned long now; 232 unsigned long now;
233 int print; 233 int print;
234 234
235 atomic_inc(&audit_lost); 235 atomic_inc(&audit_lost);
236 236
237 print = (audit_failure == AUDIT_FAIL_PANIC || !audit_rate_limit); 237 print = (audit_failure == AUDIT_FAIL_PANIC || !audit_rate_limit);
238 238
239 if (!print) { 239 if (!print) {
240 spin_lock_irqsave(&lock, flags); 240 spin_lock_irqsave(&lock, flags);
241 now = jiffies; 241 now = jiffies;
242 if (now - last_msg > HZ) { 242 if (now - last_msg > HZ) {
243 print = 1; 243 print = 1;
244 last_msg = now; 244 last_msg = now;
245 } 245 }
246 spin_unlock_irqrestore(&lock, flags); 246 spin_unlock_irqrestore(&lock, flags);
247 } 247 }
248 248
249 if (print) { 249 if (print) {
250 if (printk_ratelimit()) 250 if (printk_ratelimit())
251 printk(KERN_WARNING 251 printk(KERN_WARNING
252 "audit: audit_lost=%d audit_rate_limit=%d " 252 "audit: audit_lost=%d audit_rate_limit=%d "
253 "audit_backlog_limit=%d\n", 253 "audit_backlog_limit=%d\n",
254 atomic_read(&audit_lost), 254 atomic_read(&audit_lost),
255 audit_rate_limit, 255 audit_rate_limit,
256 audit_backlog_limit); 256 audit_backlog_limit);
257 audit_panic(message); 257 audit_panic(message);
258 } 258 }
259 } 259 }
260 260
261 static int audit_log_config_change(char *function_name, int new, int old, 261 static int audit_log_config_change(char *function_name, int new, int old,
262 uid_t loginuid, u32 sessionid, u32 sid, 262 uid_t loginuid, u32 sessionid, u32 sid,
263 int allow_changes) 263 int allow_changes)
264 { 264 {
265 struct audit_buffer *ab; 265 struct audit_buffer *ab;
266 int rc = 0; 266 int rc = 0;
267 267
268 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE); 268 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
269 audit_log_format(ab, "%s=%d old=%d auid=%u ses=%u", function_name, new, 269 audit_log_format(ab, "%s=%d old=%d auid=%u ses=%u", function_name, new,
270 old, loginuid, sessionid); 270 old, loginuid, sessionid);
271 if (sid) { 271 if (sid) {
272 char *ctx = NULL; 272 char *ctx = NULL;
273 u32 len; 273 u32 len;
274 274
275 rc = security_secid_to_secctx(sid, &ctx, &len); 275 rc = security_secid_to_secctx(sid, &ctx, &len);
276 if (rc) { 276 if (rc) {
277 audit_log_format(ab, " sid=%u", sid); 277 audit_log_format(ab, " sid=%u", sid);
278 allow_changes = 0; /* Something weird, deny request */ 278 allow_changes = 0; /* Something weird, deny request */
279 } else { 279 } else {
280 audit_log_format(ab, " subj=%s", ctx); 280 audit_log_format(ab, " subj=%s", ctx);
281 security_release_secctx(ctx, len); 281 security_release_secctx(ctx, len);
282 } 282 }
283 } 283 }
284 audit_log_format(ab, " res=%d", allow_changes); 284 audit_log_format(ab, " res=%d", allow_changes);
285 audit_log_end(ab); 285 audit_log_end(ab);
286 return rc; 286 return rc;
287 } 287 }
288 288
289 static int audit_do_config_change(char *function_name, int *to_change, 289 static int audit_do_config_change(char *function_name, int *to_change,
290 int new, uid_t loginuid, u32 sessionid, 290 int new, uid_t loginuid, u32 sessionid,
291 u32 sid) 291 u32 sid)
292 { 292 {
293 int allow_changes, rc = 0, old = *to_change; 293 int allow_changes, rc = 0, old = *to_change;
294 294
295 /* check if we are locked */ 295 /* check if we are locked */
296 if (audit_enabled == AUDIT_LOCKED) 296 if (audit_enabled == AUDIT_LOCKED)
297 allow_changes = 0; 297 allow_changes = 0;
298 else 298 else
299 allow_changes = 1; 299 allow_changes = 1;
300 300
301 if (audit_enabled != AUDIT_OFF) { 301 if (audit_enabled != AUDIT_OFF) {
302 rc = audit_log_config_change(function_name, new, old, loginuid, 302 rc = audit_log_config_change(function_name, new, old, loginuid,
303 sessionid, sid, allow_changes); 303 sessionid, sid, allow_changes);
304 if (rc) 304 if (rc)
305 allow_changes = 0; 305 allow_changes = 0;
306 } 306 }
307 307
308 /* If we are allowed, make the change */ 308 /* If we are allowed, make the change */
309 if (allow_changes == 1) 309 if (allow_changes == 1)
310 *to_change = new; 310 *to_change = new;
311 /* Not allowed, update reason */ 311 /* Not allowed, update reason */
312 else if (rc == 0) 312 else if (rc == 0)
313 rc = -EPERM; 313 rc = -EPERM;
314 return rc; 314 return rc;
315 } 315 }
316 316
317 static int audit_set_rate_limit(int limit, uid_t loginuid, u32 sessionid, 317 static int audit_set_rate_limit(int limit, uid_t loginuid, u32 sessionid,
318 u32 sid) 318 u32 sid)
319 { 319 {
320 return audit_do_config_change("audit_rate_limit", &audit_rate_limit, 320 return audit_do_config_change("audit_rate_limit", &audit_rate_limit,
321 limit, loginuid, sessionid, sid); 321 limit, loginuid, sessionid, sid);
322 } 322 }
323 323
324 static int audit_set_backlog_limit(int limit, uid_t loginuid, u32 sessionid, 324 static int audit_set_backlog_limit(int limit, uid_t loginuid, u32 sessionid,
325 u32 sid) 325 u32 sid)
326 { 326 {
327 return audit_do_config_change("audit_backlog_limit", &audit_backlog_limit, 327 return audit_do_config_change("audit_backlog_limit", &audit_backlog_limit,
328 limit, loginuid, sessionid, sid); 328 limit, loginuid, sessionid, sid);
329 } 329 }
330 330
331 static int audit_set_enabled(int state, uid_t loginuid, u32 sessionid, u32 sid) 331 static int audit_set_enabled(int state, uid_t loginuid, u32 sessionid, u32 sid)
332 { 332 {
333 int rc; 333 int rc;
334 if (state < AUDIT_OFF || state > AUDIT_LOCKED) 334 if (state < AUDIT_OFF || state > AUDIT_LOCKED)
335 return -EINVAL; 335 return -EINVAL;
336 336
337 rc = audit_do_config_change("audit_enabled", &audit_enabled, state, 337 rc = audit_do_config_change("audit_enabled", &audit_enabled, state,
338 loginuid, sessionid, sid); 338 loginuid, sessionid, sid);
339 339
340 if (!rc) 340 if (!rc)
341 audit_ever_enabled |= !!state; 341 audit_ever_enabled |= !!state;
342 342
343 return rc; 343 return rc;
344 } 344 }
345 345
346 static int audit_set_failure(int state, uid_t loginuid, u32 sessionid, u32 sid) 346 static int audit_set_failure(int state, uid_t loginuid, u32 sessionid, u32 sid)
347 { 347 {
348 if (state != AUDIT_FAIL_SILENT 348 if (state != AUDIT_FAIL_SILENT
349 && state != AUDIT_FAIL_PRINTK 349 && state != AUDIT_FAIL_PRINTK
350 && state != AUDIT_FAIL_PANIC) 350 && state != AUDIT_FAIL_PANIC)
351 return -EINVAL; 351 return -EINVAL;
352 352
353 return audit_do_config_change("audit_failure", &audit_failure, state, 353 return audit_do_config_change("audit_failure", &audit_failure, state,
354 loginuid, sessionid, sid); 354 loginuid, sessionid, sid);
355 } 355 }
356 356
357 /* 357 /*
358 * Queue skbs to be sent to auditd when/if it comes back. These skbs should 358 * Queue skbs to be sent to auditd when/if it comes back. These skbs should
359 * already have been sent via prink/syslog and so if these messages are dropped 359 * already have been sent via prink/syslog and so if these messages are dropped
360 * it is not a huge concern since we already passed the audit_log_lost() 360 * it is not a huge concern since we already passed the audit_log_lost()
361 * notification and stuff. This is just nice to get audit messages during 361 * notification and stuff. This is just nice to get audit messages during
362 * boot before auditd is running or messages generated while auditd is stopped. 362 * boot before auditd is running or messages generated while auditd is stopped.
363 * This only holds messages is audit_default is set, aka booting with audit=1 363 * This only holds messages is audit_default is set, aka booting with audit=1
364 * or building your kernel that way. 364 * or building your kernel that way.
365 */ 365 */
366 static void audit_hold_skb(struct sk_buff *skb) 366 static void audit_hold_skb(struct sk_buff *skb)
367 { 367 {
368 if (audit_default && 368 if (audit_default &&
369 skb_queue_len(&audit_skb_hold_queue) < audit_backlog_limit) 369 skb_queue_len(&audit_skb_hold_queue) < audit_backlog_limit)
370 skb_queue_tail(&audit_skb_hold_queue, skb); 370 skb_queue_tail(&audit_skb_hold_queue, skb);
371 else 371 else
372 kfree_skb(skb); 372 kfree_skb(skb);
373 } 373 }
374 374
375 static void kauditd_send_skb(struct sk_buff *skb) 375 static void kauditd_send_skb(struct sk_buff *skb)
376 { 376 {
377 int err; 377 int err;
378 /* take a reference in case we can't send it and we want to hold it */ 378 /* take a reference in case we can't send it and we want to hold it */
379 skb_get(skb); 379 skb_get(skb);
380 err = netlink_unicast(audit_sock, skb, audit_nlk_pid, 0); 380 err = netlink_unicast(audit_sock, skb, audit_nlk_pid, 0);
381 if (err < 0) { 381 if (err < 0) {
382 BUG_ON(err != -ECONNREFUSED); /* Shoudn't happen */ 382 BUG_ON(err != -ECONNREFUSED); /* Shoudn't happen */
383 printk(KERN_ERR "audit: *NO* daemon at audit_pid=%d\n", audit_pid); 383 printk(KERN_ERR "audit: *NO* daemon at audit_pid=%d\n", audit_pid);
384 audit_log_lost("auditd dissapeared\n"); 384 audit_log_lost("auditd dissapeared\n");
385 audit_pid = 0; 385 audit_pid = 0;
386 /* we might get lucky and get this in the next auditd */ 386 /* we might get lucky and get this in the next auditd */
387 audit_hold_skb(skb); 387 audit_hold_skb(skb);
388 } else 388 } else
389 /* drop the extra reference if sent ok */ 389 /* drop the extra reference if sent ok */
390 kfree_skb(skb); 390 kfree_skb(skb);
391 } 391 }
392 392
393 static int kauditd_thread(void *dummy) 393 static int kauditd_thread(void *dummy)
394 { 394 {
395 struct sk_buff *skb; 395 struct sk_buff *skb;
396 396
397 set_freezable(); 397 set_freezable();
398 while (!kthread_should_stop()) { 398 while (!kthread_should_stop()) {
399 /* 399 /*
400 * if auditd just started drain the queue of messages already 400 * if auditd just started drain the queue of messages already
401 * sent to syslog/printk. remember loss here is ok. we already 401 * sent to syslog/printk. remember loss here is ok. we already
402 * called audit_log_lost() if it didn't go out normally. so the 402 * called audit_log_lost() if it didn't go out normally. so the
403 * race between the skb_dequeue and the next check for audit_pid 403 * race between the skb_dequeue and the next check for audit_pid
404 * doesn't matter. 404 * doesn't matter.
405 * 405 *
406 * if you ever find kauditd to be too slow we can get a perf win 406 * if you ever find kauditd to be too slow we can get a perf win
407 * by doing our own locking and keeping better track if there 407 * by doing our own locking and keeping better track if there
408 * are messages in this queue. I don't see the need now, but 408 * are messages in this queue. I don't see the need now, but
409 * in 5 years when I want to play with this again I'll see this 409 * in 5 years when I want to play with this again I'll see this
410 * note and still have no friggin idea what i'm thinking today. 410 * note and still have no friggin idea what i'm thinking today.
411 */ 411 */
412 if (audit_default && audit_pid) { 412 if (audit_default && audit_pid) {
413 skb = skb_dequeue(&audit_skb_hold_queue); 413 skb = skb_dequeue(&audit_skb_hold_queue);
414 if (unlikely(skb)) { 414 if (unlikely(skb)) {
415 while (skb && audit_pid) { 415 while (skb && audit_pid) {
416 kauditd_send_skb(skb); 416 kauditd_send_skb(skb);
417 skb = skb_dequeue(&audit_skb_hold_queue); 417 skb = skb_dequeue(&audit_skb_hold_queue);
418 } 418 }
419 } 419 }
420 } 420 }
421 421
422 skb = skb_dequeue(&audit_skb_queue); 422 skb = skb_dequeue(&audit_skb_queue);
423 wake_up(&audit_backlog_wait); 423 wake_up(&audit_backlog_wait);
424 if (skb) { 424 if (skb) {
425 if (audit_pid) 425 if (audit_pid)
426 kauditd_send_skb(skb); 426 kauditd_send_skb(skb);
427 else { 427 else {
428 if (printk_ratelimit()) 428 if (printk_ratelimit())
429 printk(KERN_NOTICE "%s\n", skb->data + NLMSG_SPACE(0)); 429 printk(KERN_NOTICE "%s\n", skb->data + NLMSG_SPACE(0));
430 else 430 else
431 audit_log_lost("printk limit exceeded\n"); 431 audit_log_lost("printk limit exceeded\n");
432 432
433 audit_hold_skb(skb); 433 audit_hold_skb(skb);
434 } 434 }
435 } else { 435 } else {
436 DECLARE_WAITQUEUE(wait, current); 436 DECLARE_WAITQUEUE(wait, current);
437 set_current_state(TASK_INTERRUPTIBLE); 437 set_current_state(TASK_INTERRUPTIBLE);
438 add_wait_queue(&kauditd_wait, &wait); 438 add_wait_queue(&kauditd_wait, &wait);
439 439
440 if (!skb_queue_len(&audit_skb_queue)) { 440 if (!skb_queue_len(&audit_skb_queue)) {
441 try_to_freeze(); 441 try_to_freeze();
442 schedule(); 442 schedule();
443 } 443 }
444 444
445 __set_current_state(TASK_RUNNING); 445 __set_current_state(TASK_RUNNING);
446 remove_wait_queue(&kauditd_wait, &wait); 446 remove_wait_queue(&kauditd_wait, &wait);
447 } 447 }
448 } 448 }
449 return 0; 449 return 0;
450 } 450 }
451 451
452 static int audit_prepare_user_tty(pid_t pid, uid_t loginuid, u32 sessionid) 452 static int audit_prepare_user_tty(pid_t pid, uid_t loginuid, u32 sessionid)
453 { 453 {
454 struct task_struct *tsk; 454 struct task_struct *tsk;
455 int err; 455 int err;
456 456
457 read_lock(&tasklist_lock); 457 read_lock(&tasklist_lock);
458 tsk = find_task_by_vpid(pid); 458 tsk = find_task_by_vpid(pid);
459 err = -ESRCH; 459 err = -ESRCH;
460 if (!tsk) 460 if (!tsk)
461 goto out; 461 goto out;
462 err = 0; 462 err = 0;
463 463
464 spin_lock_irq(&tsk->sighand->siglock); 464 spin_lock_irq(&tsk->sighand->siglock);
465 if (!tsk->signal->audit_tty) 465 if (!tsk->signal->audit_tty)
466 err = -EPERM; 466 err = -EPERM;
467 spin_unlock_irq(&tsk->sighand->siglock); 467 spin_unlock_irq(&tsk->sighand->siglock);
468 if (err) 468 if (err)
469 goto out; 469 goto out;
470 470
471 tty_audit_push_task(tsk, loginuid, sessionid); 471 tty_audit_push_task(tsk, loginuid, sessionid);
472 out: 472 out:
473 read_unlock(&tasklist_lock); 473 read_unlock(&tasklist_lock);
474 return err; 474 return err;
475 } 475 }
476 476
477 int audit_send_list(void *_dest) 477 int audit_send_list(void *_dest)
478 { 478 {
479 struct audit_netlink_list *dest = _dest; 479 struct audit_netlink_list *dest = _dest;
480 int pid = dest->pid; 480 int pid = dest->pid;
481 struct sk_buff *skb; 481 struct sk_buff *skb;
482 482
483 /* wait for parent to finish and send an ACK */ 483 /* wait for parent to finish and send an ACK */
484 mutex_lock(&audit_cmd_mutex); 484 mutex_lock(&audit_cmd_mutex);
485 mutex_unlock(&audit_cmd_mutex); 485 mutex_unlock(&audit_cmd_mutex);
486 486
487 while ((skb = __skb_dequeue(&dest->q)) != NULL) 487 while ((skb = __skb_dequeue(&dest->q)) != NULL)
488 netlink_unicast(audit_sock, skb, pid, 0); 488 netlink_unicast(audit_sock, skb, pid, 0);
489 489
490 kfree(dest); 490 kfree(dest);
491 491
492 return 0; 492 return 0;
493 } 493 }
494 494
495 #ifdef CONFIG_AUDIT_TREE 495 #ifdef CONFIG_AUDIT_TREE
496 static int prune_tree_thread(void *unused) 496 static int prune_tree_thread(void *unused)
497 { 497 {
498 mutex_lock(&audit_cmd_mutex); 498 mutex_lock(&audit_cmd_mutex);
499 audit_prune_trees(); 499 audit_prune_trees();
500 mutex_unlock(&audit_cmd_mutex); 500 mutex_unlock(&audit_cmd_mutex);
501 return 0; 501 return 0;
502 } 502 }
503 503
504 void audit_schedule_prune(void) 504 void audit_schedule_prune(void)
505 { 505 {
506 kthread_run(prune_tree_thread, NULL, "audit_prune_tree"); 506 kthread_run(prune_tree_thread, NULL, "audit_prune_tree");
507 } 507 }
508 #endif 508 #endif
509 509
510 struct sk_buff *audit_make_reply(int pid, int seq, int type, int done, 510 struct sk_buff *audit_make_reply(int pid, int seq, int type, int done,
511 int multi, void *payload, int size) 511 int multi, void *payload, int size)
512 { 512 {
513 struct sk_buff *skb; 513 struct sk_buff *skb;
514 struct nlmsghdr *nlh; 514 struct nlmsghdr *nlh;
515 int len = NLMSG_SPACE(size); 515 int len = NLMSG_SPACE(size);
516 void *data; 516 void *data;
517 int flags = multi ? NLM_F_MULTI : 0; 517 int flags = multi ? NLM_F_MULTI : 0;
518 int t = done ? NLMSG_DONE : type; 518 int t = done ? NLMSG_DONE : type;
519 519
520 skb = alloc_skb(len, GFP_KERNEL); 520 skb = alloc_skb(len, GFP_KERNEL);
521 if (!skb) 521 if (!skb)
522 return NULL; 522 return NULL;
523 523
524 nlh = NLMSG_PUT(skb, pid, seq, t, size); 524 nlh = NLMSG_PUT(skb, pid, seq, t, size);
525 nlh->nlmsg_flags = flags; 525 nlh->nlmsg_flags = flags;
526 data = NLMSG_DATA(nlh); 526 data = NLMSG_DATA(nlh);
527 memcpy(data, payload, size); 527 memcpy(data, payload, size);
528 return skb; 528 return skb;
529 529
530 nlmsg_failure: /* Used by NLMSG_PUT */ 530 nlmsg_failure: /* Used by NLMSG_PUT */
531 if (skb) 531 if (skb)
532 kfree_skb(skb); 532 kfree_skb(skb);
533 return NULL; 533 return NULL;
534 } 534 }
535 535
536 static int audit_send_reply_thread(void *arg) 536 static int audit_send_reply_thread(void *arg)
537 { 537 {
538 struct audit_reply *reply = (struct audit_reply *)arg; 538 struct audit_reply *reply = (struct audit_reply *)arg;
539 539
540 mutex_lock(&audit_cmd_mutex); 540 mutex_lock(&audit_cmd_mutex);
541 mutex_unlock(&audit_cmd_mutex); 541 mutex_unlock(&audit_cmd_mutex);
542 542
543 /* Ignore failure. It'll only happen if the sender goes away, 543 /* Ignore failure. It'll only happen if the sender goes away,
544 because our timeout is set to infinite. */ 544 because our timeout is set to infinite. */
545 netlink_unicast(audit_sock, reply->skb, reply->pid, 0); 545 netlink_unicast(audit_sock, reply->skb, reply->pid, 0);
546 kfree(reply); 546 kfree(reply);
547 return 0; 547 return 0;
548 } 548 }
549 /** 549 /**
550 * audit_send_reply - send an audit reply message via netlink 550 * audit_send_reply - send an audit reply message via netlink
551 * @pid: process id to send reply to 551 * @pid: process id to send reply to
552 * @seq: sequence number 552 * @seq: sequence number
553 * @type: audit message type 553 * @type: audit message type
554 * @done: done (last) flag 554 * @done: done (last) flag
555 * @multi: multi-part message flag 555 * @multi: multi-part message flag
556 * @payload: payload data 556 * @payload: payload data
557 * @size: payload size 557 * @size: payload size
558 * 558 *
559 * Allocates an skb, builds the netlink message, and sends it to the pid. 559 * Allocates an skb, builds the netlink message, and sends it to the pid.
560 * No failure notifications. 560 * No failure notifications.
561 */ 561 */
562 void audit_send_reply(int pid, int seq, int type, int done, int multi, 562 void audit_send_reply(int pid, int seq, int type, int done, int multi,
563 void *payload, int size) 563 void *payload, int size)
564 { 564 {
565 struct sk_buff *skb; 565 struct sk_buff *skb;
566 struct task_struct *tsk; 566 struct task_struct *tsk;
567 struct audit_reply *reply = kmalloc(sizeof(struct audit_reply), 567 struct audit_reply *reply = kmalloc(sizeof(struct audit_reply),
568 GFP_KERNEL); 568 GFP_KERNEL);
569 569
570 if (!reply) 570 if (!reply)
571 return; 571 return;
572 572
573 skb = audit_make_reply(pid, seq, type, done, multi, payload, size); 573 skb = audit_make_reply(pid, seq, type, done, multi, payload, size);
574 if (!skb) 574 if (!skb)
575 return; 575 goto out;
576 576
577 reply->pid = pid; 577 reply->pid = pid;
578 reply->skb = skb; 578 reply->skb = skb;
579 579
580 tsk = kthread_run(audit_send_reply_thread, reply, "audit_send_reply"); 580 tsk = kthread_run(audit_send_reply_thread, reply, "audit_send_reply");
581 if (IS_ERR(tsk)) { 581 if (!IS_ERR(tsk))
582 kfree(reply); 582 return;
583 kfree_skb(skb); 583 kfree_skb(skb);
584 } 584 out:
585 kfree(reply);
585 } 586 }
586 587
587 /* 588 /*
588 * Check for appropriate CAP_AUDIT_ capabilities on incoming audit 589 * Check for appropriate CAP_AUDIT_ capabilities on incoming audit
589 * control messages. 590 * control messages.
590 */ 591 */
591 static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type) 592 static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type)
592 { 593 {
593 int err = 0; 594 int err = 0;
594 595
595 switch (msg_type) { 596 switch (msg_type) {
596 case AUDIT_GET: 597 case AUDIT_GET:
597 case AUDIT_LIST: 598 case AUDIT_LIST:
598 case AUDIT_LIST_RULES: 599 case AUDIT_LIST_RULES:
599 case AUDIT_SET: 600 case AUDIT_SET:
600 case AUDIT_ADD: 601 case AUDIT_ADD:
601 case AUDIT_ADD_RULE: 602 case AUDIT_ADD_RULE:
602 case AUDIT_DEL: 603 case AUDIT_DEL:
603 case AUDIT_DEL_RULE: 604 case AUDIT_DEL_RULE:
604 case AUDIT_SIGNAL_INFO: 605 case AUDIT_SIGNAL_INFO:
605 case AUDIT_TTY_GET: 606 case AUDIT_TTY_GET:
606 case AUDIT_TTY_SET: 607 case AUDIT_TTY_SET:
607 case AUDIT_TRIM: 608 case AUDIT_TRIM:
608 case AUDIT_MAKE_EQUIV: 609 case AUDIT_MAKE_EQUIV:
609 if (security_netlink_recv(skb, CAP_AUDIT_CONTROL)) 610 if (security_netlink_recv(skb, CAP_AUDIT_CONTROL))
610 err = -EPERM; 611 err = -EPERM;
611 break; 612 break;
612 case AUDIT_USER: 613 case AUDIT_USER:
613 case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG: 614 case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG:
614 case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2: 615 case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2:
615 if (security_netlink_recv(skb, CAP_AUDIT_WRITE)) 616 if (security_netlink_recv(skb, CAP_AUDIT_WRITE))
616 err = -EPERM; 617 err = -EPERM;
617 break; 618 break;
618 default: /* bad msg */ 619 default: /* bad msg */
619 err = -EINVAL; 620 err = -EINVAL;
620 } 621 }
621 622
622 return err; 623 return err;
623 } 624 }
624 625
625 static int audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type, 626 static int audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type,
626 u32 pid, u32 uid, uid_t auid, u32 ses, 627 u32 pid, u32 uid, uid_t auid, u32 ses,
627 u32 sid) 628 u32 sid)
628 { 629 {
629 int rc = 0; 630 int rc = 0;
630 char *ctx = NULL; 631 char *ctx = NULL;
631 u32 len; 632 u32 len;
632 633
633 if (!audit_enabled) { 634 if (!audit_enabled) {
634 *ab = NULL; 635 *ab = NULL;
635 return rc; 636 return rc;
636 } 637 }
637 638
638 *ab = audit_log_start(NULL, GFP_KERNEL, msg_type); 639 *ab = audit_log_start(NULL, GFP_KERNEL, msg_type);
639 audit_log_format(*ab, "user pid=%d uid=%u auid=%u ses=%u", 640 audit_log_format(*ab, "user pid=%d uid=%u auid=%u ses=%u",
640 pid, uid, auid, ses); 641 pid, uid, auid, ses);
641 if (sid) { 642 if (sid) {
642 rc = security_secid_to_secctx(sid, &ctx, &len); 643 rc = security_secid_to_secctx(sid, &ctx, &len);
643 if (rc) 644 if (rc)
644 audit_log_format(*ab, " ssid=%u", sid); 645 audit_log_format(*ab, " ssid=%u", sid);
645 else { 646 else {
646 audit_log_format(*ab, " subj=%s", ctx); 647 audit_log_format(*ab, " subj=%s", ctx);
647 security_release_secctx(ctx, len); 648 security_release_secctx(ctx, len);
648 } 649 }
649 } 650 }
650 651
651 return rc; 652 return rc;
652 } 653 }
653 654
654 static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 655 static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
655 { 656 {
656 u32 uid, pid, seq, sid; 657 u32 uid, pid, seq, sid;
657 void *data; 658 void *data;
658 struct audit_status *status_get, status_set; 659 struct audit_status *status_get, status_set;
659 int err; 660 int err;
660 struct audit_buffer *ab; 661 struct audit_buffer *ab;
661 u16 msg_type = nlh->nlmsg_type; 662 u16 msg_type = nlh->nlmsg_type;
662 uid_t loginuid; /* loginuid of sender */ 663 uid_t loginuid; /* loginuid of sender */
663 u32 sessionid; 664 u32 sessionid;
664 struct audit_sig_info *sig_data; 665 struct audit_sig_info *sig_data;
665 char *ctx = NULL; 666 char *ctx = NULL;
666 u32 len; 667 u32 len;
667 668
668 err = audit_netlink_ok(skb, msg_type); 669 err = audit_netlink_ok(skb, msg_type);
669 if (err) 670 if (err)
670 return err; 671 return err;
671 672
672 /* As soon as there's any sign of userspace auditd, 673 /* As soon as there's any sign of userspace auditd,
673 * start kauditd to talk to it */ 674 * start kauditd to talk to it */
674 if (!kauditd_task) 675 if (!kauditd_task)
675 kauditd_task = kthread_run(kauditd_thread, NULL, "kauditd"); 676 kauditd_task = kthread_run(kauditd_thread, NULL, "kauditd");
676 if (IS_ERR(kauditd_task)) { 677 if (IS_ERR(kauditd_task)) {
677 err = PTR_ERR(kauditd_task); 678 err = PTR_ERR(kauditd_task);
678 kauditd_task = NULL; 679 kauditd_task = NULL;
679 return err; 680 return err;
680 } 681 }
681 682
682 pid = NETLINK_CREDS(skb)->pid; 683 pid = NETLINK_CREDS(skb)->pid;
683 uid = NETLINK_CREDS(skb)->uid; 684 uid = NETLINK_CREDS(skb)->uid;
684 loginuid = NETLINK_CB(skb).loginuid; 685 loginuid = NETLINK_CB(skb).loginuid;
685 sessionid = NETLINK_CB(skb).sessionid; 686 sessionid = NETLINK_CB(skb).sessionid;
686 sid = NETLINK_CB(skb).sid; 687 sid = NETLINK_CB(skb).sid;
687 seq = nlh->nlmsg_seq; 688 seq = nlh->nlmsg_seq;
688 data = NLMSG_DATA(nlh); 689 data = NLMSG_DATA(nlh);
689 690
690 switch (msg_type) { 691 switch (msg_type) {
691 case AUDIT_GET: 692 case AUDIT_GET:
692 status_set.enabled = audit_enabled; 693 status_set.enabled = audit_enabled;
693 status_set.failure = audit_failure; 694 status_set.failure = audit_failure;
694 status_set.pid = audit_pid; 695 status_set.pid = audit_pid;
695 status_set.rate_limit = audit_rate_limit; 696 status_set.rate_limit = audit_rate_limit;
696 status_set.backlog_limit = audit_backlog_limit; 697 status_set.backlog_limit = audit_backlog_limit;
697 status_set.lost = atomic_read(&audit_lost); 698 status_set.lost = atomic_read(&audit_lost);
698 status_set.backlog = skb_queue_len(&audit_skb_queue); 699 status_set.backlog = skb_queue_len(&audit_skb_queue);
699 audit_send_reply(NETLINK_CB(skb).pid, seq, AUDIT_GET, 0, 0, 700 audit_send_reply(NETLINK_CB(skb).pid, seq, AUDIT_GET, 0, 0,
700 &status_set, sizeof(status_set)); 701 &status_set, sizeof(status_set));
701 break; 702 break;
702 case AUDIT_SET: 703 case AUDIT_SET:
703 if (nlh->nlmsg_len < sizeof(struct audit_status)) 704 if (nlh->nlmsg_len < sizeof(struct audit_status))
704 return -EINVAL; 705 return -EINVAL;
705 status_get = (struct audit_status *)data; 706 status_get = (struct audit_status *)data;
706 if (status_get->mask & AUDIT_STATUS_ENABLED) { 707 if (status_get->mask & AUDIT_STATUS_ENABLED) {
707 err = audit_set_enabled(status_get->enabled, 708 err = audit_set_enabled(status_get->enabled,
708 loginuid, sessionid, sid); 709 loginuid, sessionid, sid);
709 if (err < 0) return err; 710 if (err < 0) return err;
710 } 711 }
711 if (status_get->mask & AUDIT_STATUS_FAILURE) { 712 if (status_get->mask & AUDIT_STATUS_FAILURE) {
712 err = audit_set_failure(status_get->failure, 713 err = audit_set_failure(status_get->failure,
713 loginuid, sessionid, sid); 714 loginuid, sessionid, sid);
714 if (err < 0) return err; 715 if (err < 0) return err;
715 } 716 }
716 if (status_get->mask & AUDIT_STATUS_PID) { 717 if (status_get->mask & AUDIT_STATUS_PID) {
717 int new_pid = status_get->pid; 718 int new_pid = status_get->pid;
718 719
719 if (audit_enabled != AUDIT_OFF) 720 if (audit_enabled != AUDIT_OFF)
720 audit_log_config_change("audit_pid", new_pid, 721 audit_log_config_change("audit_pid", new_pid,
721 audit_pid, loginuid, 722 audit_pid, loginuid,
722 sessionid, sid, 1); 723 sessionid, sid, 1);
723 724
724 audit_pid = new_pid; 725 audit_pid = new_pid;
725 audit_nlk_pid = NETLINK_CB(skb).pid; 726 audit_nlk_pid = NETLINK_CB(skb).pid;
726 } 727 }
727 if (status_get->mask & AUDIT_STATUS_RATE_LIMIT) 728 if (status_get->mask & AUDIT_STATUS_RATE_LIMIT)
728 err = audit_set_rate_limit(status_get->rate_limit, 729 err = audit_set_rate_limit(status_get->rate_limit,
729 loginuid, sessionid, sid); 730 loginuid, sessionid, sid);
730 if (status_get->mask & AUDIT_STATUS_BACKLOG_LIMIT) 731 if (status_get->mask & AUDIT_STATUS_BACKLOG_LIMIT)
731 err = audit_set_backlog_limit(status_get->backlog_limit, 732 err = audit_set_backlog_limit(status_get->backlog_limit,
732 loginuid, sessionid, sid); 733 loginuid, sessionid, sid);
733 break; 734 break;
734 case AUDIT_USER: 735 case AUDIT_USER:
735 case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG: 736 case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG:
736 case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2: 737 case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2:
737 if (!audit_enabled && msg_type != AUDIT_USER_AVC) 738 if (!audit_enabled && msg_type != AUDIT_USER_AVC)
738 return 0; 739 return 0;
739 740
740 err = audit_filter_user(&NETLINK_CB(skb), msg_type); 741 err = audit_filter_user(&NETLINK_CB(skb), msg_type);
741 if (err == 1) { 742 if (err == 1) {
742 err = 0; 743 err = 0;
743 if (msg_type == AUDIT_USER_TTY) { 744 if (msg_type == AUDIT_USER_TTY) {
744 err = audit_prepare_user_tty(pid, loginuid, 745 err = audit_prepare_user_tty(pid, loginuid,
745 sessionid); 746 sessionid);
746 if (err) 747 if (err)
747 break; 748 break;
748 } 749 }
749 audit_log_common_recv_msg(&ab, msg_type, pid, uid, 750 audit_log_common_recv_msg(&ab, msg_type, pid, uid,
750 loginuid, sessionid, sid); 751 loginuid, sessionid, sid);
751 752
752 if (msg_type != AUDIT_USER_TTY) 753 if (msg_type != AUDIT_USER_TTY)
753 audit_log_format(ab, " msg='%.1024s'", 754 audit_log_format(ab, " msg='%.1024s'",
754 (char *)data); 755 (char *)data);
755 else { 756 else {
756 int size; 757 int size;
757 758
758 audit_log_format(ab, " msg="); 759 audit_log_format(ab, " msg=");
759 size = nlmsg_len(nlh); 760 size = nlmsg_len(nlh);
760 audit_log_n_untrustedstring(ab, data, size); 761 audit_log_n_untrustedstring(ab, data, size);
761 } 762 }
762 audit_set_pid(ab, pid); 763 audit_set_pid(ab, pid);
763 audit_log_end(ab); 764 audit_log_end(ab);
764 } 765 }
765 break; 766 break;
766 case AUDIT_ADD: 767 case AUDIT_ADD:
767 case AUDIT_DEL: 768 case AUDIT_DEL:
768 if (nlmsg_len(nlh) < sizeof(struct audit_rule)) 769 if (nlmsg_len(nlh) < sizeof(struct audit_rule))
769 return -EINVAL; 770 return -EINVAL;
770 if (audit_enabled == AUDIT_LOCKED) { 771 if (audit_enabled == AUDIT_LOCKED) {
771 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid, 772 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
772 uid, loginuid, sessionid, sid); 773 uid, loginuid, sessionid, sid);
773 774
774 audit_log_format(ab, " audit_enabled=%d res=0", 775 audit_log_format(ab, " audit_enabled=%d res=0",
775 audit_enabled); 776 audit_enabled);
776 audit_log_end(ab); 777 audit_log_end(ab);
777 return -EPERM; 778 return -EPERM;
778 } 779 }
779 /* fallthrough */ 780 /* fallthrough */
780 case AUDIT_LIST: 781 case AUDIT_LIST:
781 err = audit_receive_filter(nlh->nlmsg_type, NETLINK_CB(skb).pid, 782 err = audit_receive_filter(nlh->nlmsg_type, NETLINK_CB(skb).pid,
782 uid, seq, data, nlmsg_len(nlh), 783 uid, seq, data, nlmsg_len(nlh),
783 loginuid, sessionid, sid); 784 loginuid, sessionid, sid);
784 break; 785 break;
785 case AUDIT_ADD_RULE: 786 case AUDIT_ADD_RULE:
786 case AUDIT_DEL_RULE: 787 case AUDIT_DEL_RULE:
787 if (nlmsg_len(nlh) < sizeof(struct audit_rule_data)) 788 if (nlmsg_len(nlh) < sizeof(struct audit_rule_data))
788 return -EINVAL; 789 return -EINVAL;
789 if (audit_enabled == AUDIT_LOCKED) { 790 if (audit_enabled == AUDIT_LOCKED) {
790 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid, 791 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
791 uid, loginuid, sessionid, sid); 792 uid, loginuid, sessionid, sid);
792 793
793 audit_log_format(ab, " audit_enabled=%d res=0", 794 audit_log_format(ab, " audit_enabled=%d res=0",
794 audit_enabled); 795 audit_enabled);
795 audit_log_end(ab); 796 audit_log_end(ab);
796 return -EPERM; 797 return -EPERM;
797 } 798 }
798 /* fallthrough */ 799 /* fallthrough */
799 case AUDIT_LIST_RULES: 800 case AUDIT_LIST_RULES:
800 err = audit_receive_filter(nlh->nlmsg_type, NETLINK_CB(skb).pid, 801 err = audit_receive_filter(nlh->nlmsg_type, NETLINK_CB(skb).pid,
801 uid, seq, data, nlmsg_len(nlh), 802 uid, seq, data, nlmsg_len(nlh),
802 loginuid, sessionid, sid); 803 loginuid, sessionid, sid);
803 break; 804 break;
804 case AUDIT_TRIM: 805 case AUDIT_TRIM:
805 audit_trim_trees(); 806 audit_trim_trees();
806 807
807 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid, 808 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
808 uid, loginuid, sessionid, sid); 809 uid, loginuid, sessionid, sid);
809 810
810 audit_log_format(ab, " op=trim res=1"); 811 audit_log_format(ab, " op=trim res=1");
811 audit_log_end(ab); 812 audit_log_end(ab);
812 break; 813 break;
813 case AUDIT_MAKE_EQUIV: { 814 case AUDIT_MAKE_EQUIV: {
814 void *bufp = data; 815 void *bufp = data;
815 u32 sizes[2]; 816 u32 sizes[2];
816 size_t msglen = nlmsg_len(nlh); 817 size_t msglen = nlmsg_len(nlh);
817 char *old, *new; 818 char *old, *new;
818 819
819 err = -EINVAL; 820 err = -EINVAL;
820 if (msglen < 2 * sizeof(u32)) 821 if (msglen < 2 * sizeof(u32))
821 break; 822 break;
822 memcpy(sizes, bufp, 2 * sizeof(u32)); 823 memcpy(sizes, bufp, 2 * sizeof(u32));
823 bufp += 2 * sizeof(u32); 824 bufp += 2 * sizeof(u32);
824 msglen -= 2 * sizeof(u32); 825 msglen -= 2 * sizeof(u32);
825 old = audit_unpack_string(&bufp, &msglen, sizes[0]); 826 old = audit_unpack_string(&bufp, &msglen, sizes[0]);
826 if (IS_ERR(old)) { 827 if (IS_ERR(old)) {
827 err = PTR_ERR(old); 828 err = PTR_ERR(old);
828 break; 829 break;
829 } 830 }
830 new = audit_unpack_string(&bufp, &msglen, sizes[1]); 831 new = audit_unpack_string(&bufp, &msglen, sizes[1]);
831 if (IS_ERR(new)) { 832 if (IS_ERR(new)) {
832 err = PTR_ERR(new); 833 err = PTR_ERR(new);
833 kfree(old); 834 kfree(old);
834 break; 835 break;
835 } 836 }
836 /* OK, here comes... */ 837 /* OK, here comes... */
837 err = audit_tag_tree(old, new); 838 err = audit_tag_tree(old, new);
838 839
839 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid, 840 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
840 uid, loginuid, sessionid, sid); 841 uid, loginuid, sessionid, sid);
841 842
842 audit_log_format(ab, " op=make_equiv old="); 843 audit_log_format(ab, " op=make_equiv old=");
843 audit_log_untrustedstring(ab, old); 844 audit_log_untrustedstring(ab, old);
844 audit_log_format(ab, " new="); 845 audit_log_format(ab, " new=");
845 audit_log_untrustedstring(ab, new); 846 audit_log_untrustedstring(ab, new);
846 audit_log_format(ab, " res=%d", !err); 847 audit_log_format(ab, " res=%d", !err);
847 audit_log_end(ab); 848 audit_log_end(ab);
848 kfree(old); 849 kfree(old);
849 kfree(new); 850 kfree(new);
850 break; 851 break;
851 } 852 }
852 case AUDIT_SIGNAL_INFO: 853 case AUDIT_SIGNAL_INFO:
853 err = security_secid_to_secctx(audit_sig_sid, &ctx, &len); 854 err = security_secid_to_secctx(audit_sig_sid, &ctx, &len);
854 if (err) 855 if (err)
855 return err; 856 return err;
856 sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL); 857 sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL);
857 if (!sig_data) { 858 if (!sig_data) {
858 security_release_secctx(ctx, len); 859 security_release_secctx(ctx, len);
859 return -ENOMEM; 860 return -ENOMEM;
860 } 861 }
861 sig_data->uid = audit_sig_uid; 862 sig_data->uid = audit_sig_uid;
862 sig_data->pid = audit_sig_pid; 863 sig_data->pid = audit_sig_pid;
863 memcpy(sig_data->ctx, ctx, len); 864 memcpy(sig_data->ctx, ctx, len);
864 security_release_secctx(ctx, len); 865 security_release_secctx(ctx, len);
865 audit_send_reply(NETLINK_CB(skb).pid, seq, AUDIT_SIGNAL_INFO, 866 audit_send_reply(NETLINK_CB(skb).pid, seq, AUDIT_SIGNAL_INFO,
866 0, 0, sig_data, sizeof(*sig_data) + len); 867 0, 0, sig_data, sizeof(*sig_data) + len);
867 kfree(sig_data); 868 kfree(sig_data);
868 break; 869 break;
869 case AUDIT_TTY_GET: { 870 case AUDIT_TTY_GET: {
870 struct audit_tty_status s; 871 struct audit_tty_status s;
871 struct task_struct *tsk; 872 struct task_struct *tsk;
872 873
873 read_lock(&tasklist_lock); 874 read_lock(&tasklist_lock);
874 tsk = find_task_by_vpid(pid); 875 tsk = find_task_by_vpid(pid);
875 if (!tsk) 876 if (!tsk)
876 err = -ESRCH; 877 err = -ESRCH;
877 else { 878 else {
878 spin_lock_irq(&tsk->sighand->siglock); 879 spin_lock_irq(&tsk->sighand->siglock);
879 s.enabled = tsk->signal->audit_tty != 0; 880 s.enabled = tsk->signal->audit_tty != 0;
880 spin_unlock_irq(&tsk->sighand->siglock); 881 spin_unlock_irq(&tsk->sighand->siglock);
881 } 882 }
882 read_unlock(&tasklist_lock); 883 read_unlock(&tasklist_lock);
883 audit_send_reply(NETLINK_CB(skb).pid, seq, AUDIT_TTY_GET, 0, 0, 884 audit_send_reply(NETLINK_CB(skb).pid, seq, AUDIT_TTY_GET, 0, 0,
884 &s, sizeof(s)); 885 &s, sizeof(s));
885 break; 886 break;
886 } 887 }
887 case AUDIT_TTY_SET: { 888 case AUDIT_TTY_SET: {
888 struct audit_tty_status *s; 889 struct audit_tty_status *s;
889 struct task_struct *tsk; 890 struct task_struct *tsk;
890 891
891 if (nlh->nlmsg_len < sizeof(struct audit_tty_status)) 892 if (nlh->nlmsg_len < sizeof(struct audit_tty_status))
892 return -EINVAL; 893 return -EINVAL;
893 s = data; 894 s = data;
894 if (s->enabled != 0 && s->enabled != 1) 895 if (s->enabled != 0 && s->enabled != 1)
895 return -EINVAL; 896 return -EINVAL;
896 read_lock(&tasklist_lock); 897 read_lock(&tasklist_lock);
897 tsk = find_task_by_vpid(pid); 898 tsk = find_task_by_vpid(pid);
898 if (!tsk) 899 if (!tsk)
899 err = -ESRCH; 900 err = -ESRCH;
900 else { 901 else {
901 spin_lock_irq(&tsk->sighand->siglock); 902 spin_lock_irq(&tsk->sighand->siglock);
902 tsk->signal->audit_tty = s->enabled != 0; 903 tsk->signal->audit_tty = s->enabled != 0;
903 spin_unlock_irq(&tsk->sighand->siglock); 904 spin_unlock_irq(&tsk->sighand->siglock);
904 } 905 }
905 read_unlock(&tasklist_lock); 906 read_unlock(&tasklist_lock);
906 break; 907 break;
907 } 908 }
908 default: 909 default:
909 err = -EINVAL; 910 err = -EINVAL;
910 break; 911 break;
911 } 912 }
912 913
913 return err < 0 ? err : 0; 914 return err < 0 ? err : 0;
914 } 915 }
915 916
916 /* 917 /*
917 * Get message from skb (based on rtnetlink_rcv_skb). Each message is 918 * Get message from skb (based on rtnetlink_rcv_skb). Each message is
918 * processed by audit_receive_msg. Malformed skbs with wrong length are 919 * processed by audit_receive_msg. Malformed skbs with wrong length are
919 * discarded silently. 920 * discarded silently.
920 */ 921 */
921 static void audit_receive_skb(struct sk_buff *skb) 922 static void audit_receive_skb(struct sk_buff *skb)
922 { 923 {
923 int err; 924 int err;
924 struct nlmsghdr *nlh; 925 struct nlmsghdr *nlh;
925 u32 rlen; 926 u32 rlen;
926 927
927 while (skb->len >= NLMSG_SPACE(0)) { 928 while (skb->len >= NLMSG_SPACE(0)) {
928 nlh = nlmsg_hdr(skb); 929 nlh = nlmsg_hdr(skb);
929 if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len) 930 if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
930 return; 931 return;
931 rlen = NLMSG_ALIGN(nlh->nlmsg_len); 932 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
932 if (rlen > skb->len) 933 if (rlen > skb->len)
933 rlen = skb->len; 934 rlen = skb->len;
934 if ((err = audit_receive_msg(skb, nlh))) { 935 if ((err = audit_receive_msg(skb, nlh))) {
935 netlink_ack(skb, nlh, err); 936 netlink_ack(skb, nlh, err);
936 } else if (nlh->nlmsg_flags & NLM_F_ACK) 937 } else if (nlh->nlmsg_flags & NLM_F_ACK)
937 netlink_ack(skb, nlh, 0); 938 netlink_ack(skb, nlh, 0);
938 skb_pull(skb, rlen); 939 skb_pull(skb, rlen);
939 } 940 }
940 } 941 }
941 942
942 /* Receive messages from netlink socket. */ 943 /* Receive messages from netlink socket. */
943 static void audit_receive(struct sk_buff *skb) 944 static void audit_receive(struct sk_buff *skb)
944 { 945 {
945 mutex_lock(&audit_cmd_mutex); 946 mutex_lock(&audit_cmd_mutex);
946 audit_receive_skb(skb); 947 audit_receive_skb(skb);
947 mutex_unlock(&audit_cmd_mutex); 948 mutex_unlock(&audit_cmd_mutex);
948 } 949 }
949 950
950 #ifdef CONFIG_AUDITSYSCALL 951 #ifdef CONFIG_AUDITSYSCALL
951 static const struct inotify_operations audit_inotify_ops = { 952 static const struct inotify_operations audit_inotify_ops = {
952 .handle_event = audit_handle_ievent, 953 .handle_event = audit_handle_ievent,
953 .destroy_watch = audit_free_parent, 954 .destroy_watch = audit_free_parent,
954 }; 955 };
955 #endif 956 #endif
956 957
957 /* Initialize audit support at boot time. */ 958 /* Initialize audit support at boot time. */
958 static int __init audit_init(void) 959 static int __init audit_init(void)
959 { 960 {
960 int i; 961 int i;
961 962
962 printk(KERN_INFO "audit: initializing netlink socket (%s)\n", 963 printk(KERN_INFO "audit: initializing netlink socket (%s)\n",
963 audit_default ? "enabled" : "disabled"); 964 audit_default ? "enabled" : "disabled");
964 audit_sock = netlink_kernel_create(&init_net, NETLINK_AUDIT, 0, 965 audit_sock = netlink_kernel_create(&init_net, NETLINK_AUDIT, 0,
965 audit_receive, NULL, THIS_MODULE); 966 audit_receive, NULL, THIS_MODULE);
966 if (!audit_sock) 967 if (!audit_sock)
967 audit_panic("cannot initialize netlink socket"); 968 audit_panic("cannot initialize netlink socket");
968 else 969 else
969 audit_sock->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 970 audit_sock->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
970 971
971 skb_queue_head_init(&audit_skb_queue); 972 skb_queue_head_init(&audit_skb_queue);
972 skb_queue_head_init(&audit_skb_hold_queue); 973 skb_queue_head_init(&audit_skb_hold_queue);
973 audit_initialized = 1; 974 audit_initialized = 1;
974 audit_enabled = audit_default; 975 audit_enabled = audit_default;
975 audit_ever_enabled |= !!audit_default; 976 audit_ever_enabled |= !!audit_default;
976 977
977 audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL, "initialized"); 978 audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL, "initialized");
978 979
979 #ifdef CONFIG_AUDITSYSCALL 980 #ifdef CONFIG_AUDITSYSCALL
980 audit_ih = inotify_init(&audit_inotify_ops); 981 audit_ih = inotify_init(&audit_inotify_ops);
981 if (IS_ERR(audit_ih)) 982 if (IS_ERR(audit_ih))
982 audit_panic("cannot initialize inotify handle"); 983 audit_panic("cannot initialize inotify handle");
983 #endif 984 #endif
984 985
985 for (i = 0; i < AUDIT_INODE_BUCKETS; i++) 986 for (i = 0; i < AUDIT_INODE_BUCKETS; i++)
986 INIT_LIST_HEAD(&audit_inode_hash[i]); 987 INIT_LIST_HEAD(&audit_inode_hash[i]);
987 988
988 return 0; 989 return 0;
989 } 990 }
990 __initcall(audit_init); 991 __initcall(audit_init);
991 992
992 /* Process kernel command-line parameter at boot time. audit=0 or audit=1. */ 993 /* Process kernel command-line parameter at boot time. audit=0 or audit=1. */
993 static int __init audit_enable(char *str) 994 static int __init audit_enable(char *str)
994 { 995 {
995 audit_default = !!simple_strtol(str, NULL, 0); 996 audit_default = !!simple_strtol(str, NULL, 0);
996 printk(KERN_INFO "audit: %s%s\n", 997 printk(KERN_INFO "audit: %s%s\n",
997 audit_default ? "enabled" : "disabled", 998 audit_default ? "enabled" : "disabled",
998 audit_initialized ? "" : " (after initialization)"); 999 audit_initialized ? "" : " (after initialization)");
999 if (audit_initialized) { 1000 if (audit_initialized) {
1000 audit_enabled = audit_default; 1001 audit_enabled = audit_default;
1001 audit_ever_enabled |= !!audit_default; 1002 audit_ever_enabled |= !!audit_default;
1002 } 1003 }
1003 return 1; 1004 return 1;
1004 } 1005 }
1005 1006
1006 __setup("audit=", audit_enable); 1007 __setup("audit=", audit_enable);
1007 1008
1008 static void audit_buffer_free(struct audit_buffer *ab) 1009 static void audit_buffer_free(struct audit_buffer *ab)
1009 { 1010 {
1010 unsigned long flags; 1011 unsigned long flags;
1011 1012
1012 if (!ab) 1013 if (!ab)
1013 return; 1014 return;
1014 1015
1015 if (ab->skb) 1016 if (ab->skb)
1016 kfree_skb(ab->skb); 1017 kfree_skb(ab->skb);
1017 1018
1018 spin_lock_irqsave(&audit_freelist_lock, flags); 1019 spin_lock_irqsave(&audit_freelist_lock, flags);
1019 if (audit_freelist_count > AUDIT_MAXFREE) 1020 if (audit_freelist_count > AUDIT_MAXFREE)
1020 kfree(ab); 1021 kfree(ab);
1021 else { 1022 else {
1022 audit_freelist_count++; 1023 audit_freelist_count++;
1023 list_add(&ab->list, &audit_freelist); 1024 list_add(&ab->list, &audit_freelist);
1024 } 1025 }
1025 spin_unlock_irqrestore(&audit_freelist_lock, flags); 1026 spin_unlock_irqrestore(&audit_freelist_lock, flags);
1026 } 1027 }
1027 1028
1028 static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx, 1029 static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx,
1029 gfp_t gfp_mask, int type) 1030 gfp_t gfp_mask, int type)
1030 { 1031 {
1031 unsigned long flags; 1032 unsigned long flags;
1032 struct audit_buffer *ab = NULL; 1033 struct audit_buffer *ab = NULL;
1033 struct nlmsghdr *nlh; 1034 struct nlmsghdr *nlh;
1034 1035
1035 spin_lock_irqsave(&audit_freelist_lock, flags); 1036 spin_lock_irqsave(&audit_freelist_lock, flags);
1036 if (!list_empty(&audit_freelist)) { 1037 if (!list_empty(&audit_freelist)) {
1037 ab = list_entry(audit_freelist.next, 1038 ab = list_entry(audit_freelist.next,
1038 struct audit_buffer, list); 1039 struct audit_buffer, list);
1039 list_del(&ab->list); 1040 list_del(&ab->list);
1040 --audit_freelist_count; 1041 --audit_freelist_count;
1041 } 1042 }
1042 spin_unlock_irqrestore(&audit_freelist_lock, flags); 1043 spin_unlock_irqrestore(&audit_freelist_lock, flags);
1043 1044
1044 if (!ab) { 1045 if (!ab) {
1045 ab = kmalloc(sizeof(*ab), gfp_mask); 1046 ab = kmalloc(sizeof(*ab), gfp_mask);
1046 if (!ab) 1047 if (!ab)
1047 goto err; 1048 goto err;
1048 } 1049 }
1049 1050
1050 ab->skb = alloc_skb(AUDIT_BUFSIZ, gfp_mask); 1051 ab->skb = alloc_skb(AUDIT_BUFSIZ, gfp_mask);
1051 if (!ab->skb) 1052 if (!ab->skb)
1052 goto err; 1053 goto err;
1053 1054
1054 ab->ctx = ctx; 1055 ab->ctx = ctx;
1055 ab->gfp_mask = gfp_mask; 1056 ab->gfp_mask = gfp_mask;
1056 nlh = (struct nlmsghdr *)skb_put(ab->skb, NLMSG_SPACE(0)); 1057 nlh = (struct nlmsghdr *)skb_put(ab->skb, NLMSG_SPACE(0));
1057 nlh->nlmsg_type = type; 1058 nlh->nlmsg_type = type;
1058 nlh->nlmsg_flags = 0; 1059 nlh->nlmsg_flags = 0;
1059 nlh->nlmsg_pid = 0; 1060 nlh->nlmsg_pid = 0;
1060 nlh->nlmsg_seq = 0; 1061 nlh->nlmsg_seq = 0;
1061 return ab; 1062 return ab;
1062 err: 1063 err:
1063 audit_buffer_free(ab); 1064 audit_buffer_free(ab);
1064 return NULL; 1065 return NULL;
1065 } 1066 }
1066 1067
1067 /** 1068 /**
1068 * audit_serial - compute a serial number for the audit record 1069 * audit_serial - compute a serial number for the audit record
1069 * 1070 *
1070 * Compute a serial number for the audit record. Audit records are 1071 * Compute a serial number for the audit record. Audit records are
1071 * written to user-space as soon as they are generated, so a complete 1072 * written to user-space as soon as they are generated, so a complete
1072 * audit record may be written in several pieces. The timestamp of the 1073 * audit record may be written in several pieces. The timestamp of the
1073 * record and this serial number are used by the user-space tools to 1074 * record and this serial number are used by the user-space tools to
1074 * determine which pieces belong to the same audit record. The 1075 * determine which pieces belong to the same audit record. The
1075 * (timestamp,serial) tuple is unique for each syscall and is live from 1076 * (timestamp,serial) tuple is unique for each syscall and is live from
1076 * syscall entry to syscall exit. 1077 * syscall entry to syscall exit.
1077 * 1078 *
1078 * NOTE: Another possibility is to store the formatted records off the 1079 * NOTE: Another possibility is to store the formatted records off the
1079 * audit context (for those records that have a context), and emit them 1080 * audit context (for those records that have a context), and emit them
1080 * all at syscall exit. However, this could delay the reporting of 1081 * all at syscall exit. However, this could delay the reporting of
1081 * significant errors until syscall exit (or never, if the system 1082 * significant errors until syscall exit (or never, if the system
1082 * halts). 1083 * halts).
1083 */ 1084 */
1084 unsigned int audit_serial(void) 1085 unsigned int audit_serial(void)
1085 { 1086 {
1086 static DEFINE_SPINLOCK(serial_lock); 1087 static DEFINE_SPINLOCK(serial_lock);
1087 static unsigned int serial = 0; 1088 static unsigned int serial = 0;
1088 1089
1089 unsigned long flags; 1090 unsigned long flags;
1090 unsigned int ret; 1091 unsigned int ret;
1091 1092
1092 spin_lock_irqsave(&serial_lock, flags); 1093 spin_lock_irqsave(&serial_lock, flags);
1093 do { 1094 do {
1094 ret = ++serial; 1095 ret = ++serial;
1095 } while (unlikely(!ret)); 1096 } while (unlikely(!ret));
1096 spin_unlock_irqrestore(&serial_lock, flags); 1097 spin_unlock_irqrestore(&serial_lock, flags);
1097 1098
1098 return ret; 1099 return ret;
1099 } 1100 }
1100 1101
1101 static inline void audit_get_stamp(struct audit_context *ctx, 1102 static inline void audit_get_stamp(struct audit_context *ctx,
1102 struct timespec *t, unsigned int *serial) 1103 struct timespec *t, unsigned int *serial)
1103 { 1104 {
1104 if (ctx) 1105 if (ctx)
1105 auditsc_get_stamp(ctx, t, serial); 1106 auditsc_get_stamp(ctx, t, serial);
1106 else { 1107 else {
1107 *t = CURRENT_TIME; 1108 *t = CURRENT_TIME;
1108 *serial = audit_serial(); 1109 *serial = audit_serial();
1109 } 1110 }
1110 } 1111 }
1111 1112
1112 /* Obtain an audit buffer. This routine does locking to obtain the 1113 /* Obtain an audit buffer. This routine does locking to obtain the
1113 * audit buffer, but then no locking is required for calls to 1114 * audit buffer, but then no locking is required for calls to
1114 * audit_log_*format. If the tsk is a task that is currently in a 1115 * audit_log_*format. If the tsk is a task that is currently in a
1115 * syscall, then the syscall is marked as auditable and an audit record 1116 * syscall, then the syscall is marked as auditable and an audit record
1116 * will be written at syscall exit. If there is no associated task, tsk 1117 * will be written at syscall exit. If there is no associated task, tsk
1117 * should be NULL. */ 1118 * should be NULL. */
1118 1119
1119 /** 1120 /**
1120 * audit_log_start - obtain an audit buffer 1121 * audit_log_start - obtain an audit buffer
1121 * @ctx: audit_context (may be NULL) 1122 * @ctx: audit_context (may be NULL)
1122 * @gfp_mask: type of allocation 1123 * @gfp_mask: type of allocation
1123 * @type: audit message type 1124 * @type: audit message type
1124 * 1125 *
1125 * Returns audit_buffer pointer on success or NULL on error. 1126 * Returns audit_buffer pointer on success or NULL on error.
1126 * 1127 *
1127 * Obtain an audit buffer. This routine does locking to obtain the 1128 * Obtain an audit buffer. This routine does locking to obtain the
1128 * audit buffer, but then no locking is required for calls to 1129 * audit buffer, but then no locking is required for calls to
1129 * audit_log_*format. If the task (ctx) is a task that is currently in a 1130 * audit_log_*format. If the task (ctx) is a task that is currently in a
1130 * syscall, then the syscall is marked as auditable and an audit record 1131 * syscall, then the syscall is marked as auditable and an audit record
1131 * will be written at syscall exit. If there is no associated task, then 1132 * will be written at syscall exit. If there is no associated task, then
1132 * task context (ctx) should be NULL. 1133 * task context (ctx) should be NULL.
1133 */ 1134 */
1134 struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, 1135 struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
1135 int type) 1136 int type)
1136 { 1137 {
1137 struct audit_buffer *ab = NULL; 1138 struct audit_buffer *ab = NULL;
1138 struct timespec t; 1139 struct timespec t;
1139 unsigned int uninitialized_var(serial); 1140 unsigned int uninitialized_var(serial);
1140 int reserve; 1141 int reserve;
1141 unsigned long timeout_start = jiffies; 1142 unsigned long timeout_start = jiffies;
1142 1143
1143 if (!audit_initialized) 1144 if (!audit_initialized)
1144 return NULL; 1145 return NULL;
1145 1146
1146 if (unlikely(audit_filter_type(type))) 1147 if (unlikely(audit_filter_type(type)))
1147 return NULL; 1148 return NULL;
1148 1149
1149 if (gfp_mask & __GFP_WAIT) 1150 if (gfp_mask & __GFP_WAIT)
1150 reserve = 0; 1151 reserve = 0;
1151 else 1152 else
1152 reserve = 5; /* Allow atomic callers to go up to five 1153 reserve = 5; /* Allow atomic callers to go up to five
1153 entries over the normal backlog limit */ 1154 entries over the normal backlog limit */
1154 1155
1155 while (audit_backlog_limit 1156 while (audit_backlog_limit
1156 && skb_queue_len(&audit_skb_queue) > audit_backlog_limit + reserve) { 1157 && skb_queue_len(&audit_skb_queue) > audit_backlog_limit + reserve) {
1157 if (gfp_mask & __GFP_WAIT && audit_backlog_wait_time 1158 if (gfp_mask & __GFP_WAIT && audit_backlog_wait_time
1158 && time_before(jiffies, timeout_start + audit_backlog_wait_time)) { 1159 && time_before(jiffies, timeout_start + audit_backlog_wait_time)) {
1159 1160
1160 /* Wait for auditd to drain the queue a little */ 1161 /* Wait for auditd to drain the queue a little */
1161 DECLARE_WAITQUEUE(wait, current); 1162 DECLARE_WAITQUEUE(wait, current);
1162 set_current_state(TASK_INTERRUPTIBLE); 1163 set_current_state(TASK_INTERRUPTIBLE);
1163 add_wait_queue(&audit_backlog_wait, &wait); 1164 add_wait_queue(&audit_backlog_wait, &wait);
1164 1165
1165 if (audit_backlog_limit && 1166 if (audit_backlog_limit &&
1166 skb_queue_len(&audit_skb_queue) > audit_backlog_limit) 1167 skb_queue_len(&audit_skb_queue) > audit_backlog_limit)
1167 schedule_timeout(timeout_start + audit_backlog_wait_time - jiffies); 1168 schedule_timeout(timeout_start + audit_backlog_wait_time - jiffies);
1168 1169
1169 __set_current_state(TASK_RUNNING); 1170 __set_current_state(TASK_RUNNING);
1170 remove_wait_queue(&audit_backlog_wait, &wait); 1171 remove_wait_queue(&audit_backlog_wait, &wait);
1171 continue; 1172 continue;
1172 } 1173 }
1173 if (audit_rate_check() && printk_ratelimit()) 1174 if (audit_rate_check() && printk_ratelimit())
1174 printk(KERN_WARNING 1175 printk(KERN_WARNING
1175 "audit: audit_backlog=%d > " 1176 "audit: audit_backlog=%d > "
1176 "audit_backlog_limit=%d\n", 1177 "audit_backlog_limit=%d\n",
1177 skb_queue_len(&audit_skb_queue), 1178 skb_queue_len(&audit_skb_queue),
1178 audit_backlog_limit); 1179 audit_backlog_limit);
1179 audit_log_lost("backlog limit exceeded"); 1180 audit_log_lost("backlog limit exceeded");
1180 audit_backlog_wait_time = audit_backlog_wait_overflow; 1181 audit_backlog_wait_time = audit_backlog_wait_overflow;
1181 wake_up(&audit_backlog_wait); 1182 wake_up(&audit_backlog_wait);
1182 return NULL; 1183 return NULL;
1183 } 1184 }
1184 1185
1185 ab = audit_buffer_alloc(ctx, gfp_mask, type); 1186 ab = audit_buffer_alloc(ctx, gfp_mask, type);
1186 if (!ab) { 1187 if (!ab) {
1187 audit_log_lost("out of memory in audit_log_start"); 1188 audit_log_lost("out of memory in audit_log_start");
1188 return NULL; 1189 return NULL;
1189 } 1190 }
1190 1191
1191 audit_get_stamp(ab->ctx, &t, &serial); 1192 audit_get_stamp(ab->ctx, &t, &serial);
1192 1193
1193 audit_log_format(ab, "audit(%lu.%03lu:%u): ", 1194 audit_log_format(ab, "audit(%lu.%03lu:%u): ",
1194 t.tv_sec, t.tv_nsec/1000000, serial); 1195 t.tv_sec, t.tv_nsec/1000000, serial);
1195 return ab; 1196 return ab;
1196 } 1197 }
1197 1198
1198 /** 1199 /**
1199 * audit_expand - expand skb in the audit buffer 1200 * audit_expand - expand skb in the audit buffer
1200 * @ab: audit_buffer 1201 * @ab: audit_buffer
1201 * @extra: space to add at tail of the skb 1202 * @extra: space to add at tail of the skb
1202 * 1203 *
1203 * Returns 0 (no space) on failed expansion, or available space if 1204 * Returns 0 (no space) on failed expansion, or available space if
1204 * successful. 1205 * successful.
1205 */ 1206 */
1206 static inline int audit_expand(struct audit_buffer *ab, int extra) 1207 static inline int audit_expand(struct audit_buffer *ab, int extra)
1207 { 1208 {
1208 struct sk_buff *skb = ab->skb; 1209 struct sk_buff *skb = ab->skb;
1209 int oldtail = skb_tailroom(skb); 1210 int oldtail = skb_tailroom(skb);
1210 int ret = pskb_expand_head(skb, 0, extra, ab->gfp_mask); 1211 int ret = pskb_expand_head(skb, 0, extra, ab->gfp_mask);
1211 int newtail = skb_tailroom(skb); 1212 int newtail = skb_tailroom(skb);
1212 1213
1213 if (ret < 0) { 1214 if (ret < 0) {
1214 audit_log_lost("out of memory in audit_expand"); 1215 audit_log_lost("out of memory in audit_expand");
1215 return 0; 1216 return 0;
1216 } 1217 }
1217 1218
1218 skb->truesize += newtail - oldtail; 1219 skb->truesize += newtail - oldtail;
1219 return newtail; 1220 return newtail;
1220 } 1221 }
1221 1222
1222 /* 1223 /*
1223 * Format an audit message into the audit buffer. If there isn't enough 1224 * Format an audit message into the audit buffer. If there isn't enough
1224 * room in the audit buffer, more room will be allocated and vsnprint 1225 * room in the audit buffer, more room will be allocated and vsnprint
1225 * will be called a second time. Currently, we assume that a printk 1226 * will be called a second time. Currently, we assume that a printk
1226 * can't format message larger than 1024 bytes, so we don't either. 1227 * can't format message larger than 1024 bytes, so we don't either.
1227 */ 1228 */
1228 static void audit_log_vformat(struct audit_buffer *ab, const char *fmt, 1229 static void audit_log_vformat(struct audit_buffer *ab, const char *fmt,
1229 va_list args) 1230 va_list args)
1230 { 1231 {
1231 int len, avail; 1232 int len, avail;
1232 struct sk_buff *skb; 1233 struct sk_buff *skb;
1233 va_list args2; 1234 va_list args2;
1234 1235
1235 if (!ab) 1236 if (!ab)
1236 return; 1237 return;
1237 1238
1238 BUG_ON(!ab->skb); 1239 BUG_ON(!ab->skb);
1239 skb = ab->skb; 1240 skb = ab->skb;
1240 avail = skb_tailroom(skb); 1241 avail = skb_tailroom(skb);
1241 if (avail == 0) { 1242 if (avail == 0) {
1242 avail = audit_expand(ab, AUDIT_BUFSIZ); 1243 avail = audit_expand(ab, AUDIT_BUFSIZ);
1243 if (!avail) 1244 if (!avail)
1244 goto out; 1245 goto out;
1245 } 1246 }
1246 va_copy(args2, args); 1247 va_copy(args2, args);
1247 len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args); 1248 len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args);
1248 if (len >= avail) { 1249 if (len >= avail) {
1249 /* The printk buffer is 1024 bytes long, so if we get 1250 /* The printk buffer is 1024 bytes long, so if we get
1250 * here and AUDIT_BUFSIZ is at least 1024, then we can 1251 * here and AUDIT_BUFSIZ is at least 1024, then we can
1251 * log everything that printk could have logged. */ 1252 * log everything that printk could have logged. */
1252 avail = audit_expand(ab, 1253 avail = audit_expand(ab,
1253 max_t(unsigned, AUDIT_BUFSIZ, 1+len-avail)); 1254 max_t(unsigned, AUDIT_BUFSIZ, 1+len-avail));
1254 if (!avail) 1255 if (!avail)
1255 goto out; 1256 goto out;
1256 len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args2); 1257 len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args2);
1257 } 1258 }
1258 va_end(args2); 1259 va_end(args2);
1259 if (len > 0) 1260 if (len > 0)
1260 skb_put(skb, len); 1261 skb_put(skb, len);
1261 out: 1262 out:
1262 return; 1263 return;
1263 } 1264 }
1264 1265
1265 /** 1266 /**
1266 * audit_log_format - format a message into the audit buffer. 1267 * audit_log_format - format a message into the audit buffer.
1267 * @ab: audit_buffer 1268 * @ab: audit_buffer
1268 * @fmt: format string 1269 * @fmt: format string
1269 * @...: optional parameters matching @fmt string 1270 * @...: optional parameters matching @fmt string
1270 * 1271 *
1271 * All the work is done in audit_log_vformat. 1272 * All the work is done in audit_log_vformat.
1272 */ 1273 */
1273 void audit_log_format(struct audit_buffer *ab, const char *fmt, ...) 1274 void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
1274 { 1275 {
1275 va_list args; 1276 va_list args;
1276 1277
1277 if (!ab) 1278 if (!ab)
1278 return; 1279 return;
1279 va_start(args, fmt); 1280 va_start(args, fmt);
1280 audit_log_vformat(ab, fmt, args); 1281 audit_log_vformat(ab, fmt, args);
1281 va_end(args); 1282 va_end(args);
1282 } 1283 }
1283 1284
1284 /** 1285 /**
1285 * audit_log_hex - convert a buffer to hex and append it to the audit skb 1286 * audit_log_hex - convert a buffer to hex and append it to the audit skb
1286 * @ab: the audit_buffer 1287 * @ab: the audit_buffer
1287 * @buf: buffer to convert to hex 1288 * @buf: buffer to convert to hex
1288 * @len: length of @buf to be converted 1289 * @len: length of @buf to be converted
1289 * 1290 *
1290 * No return value; failure to expand is silently ignored. 1291 * No return value; failure to expand is silently ignored.
1291 * 1292 *
1292 * This function will take the passed buf and convert it into a string of 1293 * This function will take the passed buf and convert it into a string of
1293 * ascii hex digits. The new string is placed onto the skb. 1294 * ascii hex digits. The new string is placed onto the skb.
1294 */ 1295 */
1295 void audit_log_n_hex(struct audit_buffer *ab, const unsigned char *buf, 1296 void audit_log_n_hex(struct audit_buffer *ab, const unsigned char *buf,
1296 size_t len) 1297 size_t len)
1297 { 1298 {
1298 int i, avail, new_len; 1299 int i, avail, new_len;
1299 unsigned char *ptr; 1300 unsigned char *ptr;
1300 struct sk_buff *skb; 1301 struct sk_buff *skb;
1301 static const unsigned char *hex = "0123456789ABCDEF"; 1302 static const unsigned char *hex = "0123456789ABCDEF";
1302 1303
1303 if (!ab) 1304 if (!ab)
1304 return; 1305 return;
1305 1306
1306 BUG_ON(!ab->skb); 1307 BUG_ON(!ab->skb);
1307 skb = ab->skb; 1308 skb = ab->skb;
1308 avail = skb_tailroom(skb); 1309 avail = skb_tailroom(skb);
1309 new_len = len<<1; 1310 new_len = len<<1;
1310 if (new_len >= avail) { 1311 if (new_len >= avail) {
1311 /* Round the buffer request up to the next multiple */ 1312 /* Round the buffer request up to the next multiple */
1312 new_len = AUDIT_BUFSIZ*(((new_len-avail)/AUDIT_BUFSIZ) + 1); 1313 new_len = AUDIT_BUFSIZ*(((new_len-avail)/AUDIT_BUFSIZ) + 1);
1313 avail = audit_expand(ab, new_len); 1314 avail = audit_expand(ab, new_len);
1314 if (!avail) 1315 if (!avail)
1315 return; 1316 return;
1316 } 1317 }
1317 1318
1318 ptr = skb_tail_pointer(skb); 1319 ptr = skb_tail_pointer(skb);
1319 for (i=0; i<len; i++) { 1320 for (i=0; i<len; i++) {
1320 *ptr++ = hex[(buf[i] & 0xF0)>>4]; /* Upper nibble */ 1321 *ptr++ = hex[(buf[i] & 0xF0)>>4]; /* Upper nibble */
1321 *ptr++ = hex[buf[i] & 0x0F]; /* Lower nibble */ 1322 *ptr++ = hex[buf[i] & 0x0F]; /* Lower nibble */
1322 } 1323 }
1323 *ptr = 0; 1324 *ptr = 0;
1324 skb_put(skb, len << 1); /* new string is twice the old string */ 1325 skb_put(skb, len << 1); /* new string is twice the old string */
1325 } 1326 }
1326 1327
1327 /* 1328 /*
1328 * Format a string of no more than slen characters into the audit buffer, 1329 * Format a string of no more than slen characters into the audit buffer,
1329 * enclosed in quote marks. 1330 * enclosed in quote marks.
1330 */ 1331 */
1331 void audit_log_n_string(struct audit_buffer *ab, const char *string, 1332 void audit_log_n_string(struct audit_buffer *ab, const char *string,
1332 size_t slen) 1333 size_t slen)
1333 { 1334 {
1334 int avail, new_len; 1335 int avail, new_len;
1335 unsigned char *ptr; 1336 unsigned char *ptr;
1336 struct sk_buff *skb; 1337 struct sk_buff *skb;
1337 1338
1338 if (!ab) 1339 if (!ab)
1339 return; 1340 return;
1340 1341
1341 BUG_ON(!ab->skb); 1342 BUG_ON(!ab->skb);
1342 skb = ab->skb; 1343 skb = ab->skb;
1343 avail = skb_tailroom(skb); 1344 avail = skb_tailroom(skb);
1344 new_len = slen + 3; /* enclosing quotes + null terminator */ 1345 new_len = slen + 3; /* enclosing quotes + null terminator */
1345 if (new_len > avail) { 1346 if (new_len > avail) {
1346 avail = audit_expand(ab, new_len); 1347 avail = audit_expand(ab, new_len);
1347 if (!avail) 1348 if (!avail)
1348 return; 1349 return;
1349 } 1350 }
1350 ptr = skb_tail_pointer(skb); 1351 ptr = skb_tail_pointer(skb);
1351 *ptr++ = '"'; 1352 *ptr++ = '"';
1352 memcpy(ptr, string, slen); 1353 memcpy(ptr, string, slen);
1353 ptr += slen; 1354 ptr += slen;
1354 *ptr++ = '"'; 1355 *ptr++ = '"';
1355 *ptr = 0; 1356 *ptr = 0;
1356 skb_put(skb, slen + 2); /* don't include null terminator */ 1357 skb_put(skb, slen + 2); /* don't include null terminator */
1357 } 1358 }
1358 1359
1359 /** 1360 /**
1360 * audit_string_contains_control - does a string need to be logged in hex 1361 * audit_string_contains_control - does a string need to be logged in hex
1361 * @string: string to be checked 1362 * @string: string to be checked
1362 * @len: max length of the string to check 1363 * @len: max length of the string to check
1363 */ 1364 */
1364 int audit_string_contains_control(const char *string, size_t len) 1365 int audit_string_contains_control(const char *string, size_t len)
1365 { 1366 {
1366 const unsigned char *p; 1367 const unsigned char *p;
1367 for (p = string; p < (const unsigned char *)string + len && *p; p++) { 1368 for (p = string; p < (const unsigned char *)string + len && *p; p++) {
1368 if (*p == '"' || *p < 0x21 || *p > 0x7f) 1369 if (*p == '"' || *p < 0x21 || *p > 0x7f)
1369 return 1; 1370 return 1;
1370 } 1371 }
1371 return 0; 1372 return 0;
1372 } 1373 }
1373 1374
1374 /** 1375 /**
1375 * audit_log_n_untrustedstring - log a string that may contain random characters 1376 * audit_log_n_untrustedstring - log a string that may contain random characters
1376 * @ab: audit_buffer 1377 * @ab: audit_buffer
1377 * @len: length of string (not including trailing null) 1378 * @len: length of string (not including trailing null)
1378 * @string: string to be logged 1379 * @string: string to be logged
1379 * 1380 *
1380 * This code will escape a string that is passed to it if the string 1381 * This code will escape a string that is passed to it if the string
1381 * contains a control character, unprintable character, double quote mark, 1382 * contains a control character, unprintable character, double quote mark,
1382 * or a space. Unescaped strings will start and end with a double quote mark. 1383 * or a space. Unescaped strings will start and end with a double quote mark.
1383 * Strings that are escaped are printed in hex (2 digits per char). 1384 * Strings that are escaped are printed in hex (2 digits per char).
1384 * 1385 *
1385 * The caller specifies the number of characters in the string to log, which may 1386 * The caller specifies the number of characters in the string to log, which may
1386 * or may not be the entire string. 1387 * or may not be the entire string.
1387 */ 1388 */
1388 void audit_log_n_untrustedstring(struct audit_buffer *ab, const char *string, 1389 void audit_log_n_untrustedstring(struct audit_buffer *ab, const char *string,
1389 size_t len) 1390 size_t len)
1390 { 1391 {
1391 if (audit_string_contains_control(string, len)) 1392 if (audit_string_contains_control(string, len))
1392 audit_log_n_hex(ab, string, len); 1393 audit_log_n_hex(ab, string, len);
1393 else 1394 else
1394 audit_log_n_string(ab, string, len); 1395 audit_log_n_string(ab, string, len);
1395 } 1396 }
1396 1397
1397 /** 1398 /**
1398 * audit_log_untrustedstring - log a string that may contain random characters 1399 * audit_log_untrustedstring - log a string that may contain random characters
1399 * @ab: audit_buffer 1400 * @ab: audit_buffer
1400 * @string: string to be logged 1401 * @string: string to be logged
1401 * 1402 *
1402 * Same as audit_log_n_untrustedstring(), except that strlen is used to 1403 * Same as audit_log_n_untrustedstring(), except that strlen is used to
1403 * determine string length. 1404 * determine string length.
1404 */ 1405 */
1405 void audit_log_untrustedstring(struct audit_buffer *ab, const char *string) 1406 void audit_log_untrustedstring(struct audit_buffer *ab, const char *string)
1406 { 1407 {
1407 audit_log_n_untrustedstring(ab, string, strlen(string)); 1408 audit_log_n_untrustedstring(ab, string, strlen(string));
1408 } 1409 }
1409 1410
1410 /* This is a helper-function to print the escaped d_path */ 1411 /* This is a helper-function to print the escaped d_path */
1411 void audit_log_d_path(struct audit_buffer *ab, const char *prefix, 1412 void audit_log_d_path(struct audit_buffer *ab, const char *prefix,
1412 struct path *path) 1413 struct path *path)
1413 { 1414 {
1414 char *p, *pathname; 1415 char *p, *pathname;
1415 1416
1416 if (prefix) 1417 if (prefix)
1417 audit_log_format(ab, " %s", prefix); 1418 audit_log_format(ab, " %s", prefix);
1418 1419
1419 /* We will allow 11 spaces for ' (deleted)' to be appended */ 1420 /* We will allow 11 spaces for ' (deleted)' to be appended */
1420 pathname = kmalloc(PATH_MAX+11, ab->gfp_mask); 1421 pathname = kmalloc(PATH_MAX+11, ab->gfp_mask);
1421 if (!pathname) { 1422 if (!pathname) {
1422 audit_log_format(ab, "<no memory>"); 1423 audit_log_format(ab, "<no memory>");
1423 return; 1424 return;
1424 } 1425 }
1425 p = d_path(path, pathname, PATH_MAX+11); 1426 p = d_path(path, pathname, PATH_MAX+11);
1426 if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */ 1427 if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */
1427 /* FIXME: can we save some information here? */ 1428 /* FIXME: can we save some information here? */
1428 audit_log_format(ab, "<too long>"); 1429 audit_log_format(ab, "<too long>");
1429 } else 1430 } else
1430 audit_log_untrustedstring(ab, p); 1431 audit_log_untrustedstring(ab, p);
1431 kfree(pathname); 1432 kfree(pathname);
1432 } 1433 }
1433 1434
1434 /** 1435 /**
1435 * audit_log_end - end one audit record 1436 * audit_log_end - end one audit record
1436 * @ab: the audit_buffer 1437 * @ab: the audit_buffer
1437 * 1438 *
1438 * The netlink_* functions cannot be called inside an irq context, so 1439 * The netlink_* functions cannot be called inside an irq context, so
1439 * the audit buffer is placed on a queue and a tasklet is scheduled to 1440 * the audit buffer is placed on a queue and a tasklet is scheduled to
1440 * remove them from the queue outside the irq context. May be called in 1441 * remove them from the queue outside the irq context. May be called in
1441 * any context. 1442 * any context.
1442 */ 1443 */
1443 void audit_log_end(struct audit_buffer *ab) 1444 void audit_log_end(struct audit_buffer *ab)
1444 { 1445 {
1445 if (!ab) 1446 if (!ab)
1446 return; 1447 return;
1447 if (!audit_rate_check()) { 1448 if (!audit_rate_check()) {
1448 audit_log_lost("rate limit exceeded"); 1449 audit_log_lost("rate limit exceeded");
1449 } else { 1450 } else {
1450 struct nlmsghdr *nlh = nlmsg_hdr(ab->skb); 1451 struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
1451 nlh->nlmsg_len = ab->skb->len - NLMSG_SPACE(0); 1452 nlh->nlmsg_len = ab->skb->len - NLMSG_SPACE(0);
1452 1453
1453 if (audit_pid) { 1454 if (audit_pid) {
1454 skb_queue_tail(&audit_skb_queue, ab->skb); 1455 skb_queue_tail(&audit_skb_queue, ab->skb);
1455 wake_up_interruptible(&kauditd_wait); 1456 wake_up_interruptible(&kauditd_wait);
1456 } else { 1457 } else {
1457 if (nlh->nlmsg_type != AUDIT_EOE) { 1458 if (nlh->nlmsg_type != AUDIT_EOE) {
1458 if (printk_ratelimit()) { 1459 if (printk_ratelimit()) {
1459 printk(KERN_NOTICE "type=%d %s\n", 1460 printk(KERN_NOTICE "type=%d %s\n",
1460 nlh->nlmsg_type, 1461 nlh->nlmsg_type,
1461 ab->skb->data + NLMSG_SPACE(0)); 1462 ab->skb->data + NLMSG_SPACE(0));
1462 } else 1463 } else
1463 audit_log_lost("printk limit exceeded\n"); 1464 audit_log_lost("printk limit exceeded\n");
1464 } 1465 }
1465 audit_hold_skb(ab->skb); 1466 audit_hold_skb(ab->skb);
1466 } 1467 }
1467 ab->skb = NULL; 1468 ab->skb = NULL;
1468 } 1469 }
1469 audit_buffer_free(ab); 1470 audit_buffer_free(ab);
1470 } 1471 }
1471 1472
1472 /** 1473 /**
1473 * audit_log - Log an audit record 1474 * audit_log - Log an audit record
1474 * @ctx: audit context 1475 * @ctx: audit context
1475 * @gfp_mask: type of allocation 1476 * @gfp_mask: type of allocation
1476 * @type: audit message type 1477 * @type: audit message type
1477 * @fmt: format string to use 1478 * @fmt: format string to use
1478 * @...: variable parameters matching the format string 1479 * @...: variable parameters matching the format string
1479 * 1480 *
1480 * This is a convenience function that calls audit_log_start, 1481 * This is a convenience function that calls audit_log_start,
1481 * audit_log_vformat, and audit_log_end. It may be called 1482 * audit_log_vformat, and audit_log_end. It may be called
1482 * in any context. 1483 * in any context.
1483 */ 1484 */
1484 void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type, 1485 void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
1485 const char *fmt, ...) 1486 const char *fmt, ...)
1486 { 1487 {
1487 struct audit_buffer *ab; 1488 struct audit_buffer *ab;
1488 va_list args; 1489 va_list args;
1489 1490
1490 ab = audit_log_start(ctx, gfp_mask, type); 1491 ab = audit_log_start(ctx, gfp_mask, type);
1491 if (ab) { 1492 if (ab) {
1492 va_start(args, fmt); 1493 va_start(args, fmt);
1493 audit_log_vformat(ab, fmt, args); 1494 audit_log_vformat(ab, fmt, args);
1494 va_end(args); 1495 va_end(args);
1495 audit_log_end(ab); 1496 audit_log_end(ab);
1496 } 1497 }
1497 } 1498 }
1498 1499
1499 EXPORT_SYMBOL(audit_log_start); 1500 EXPORT_SYMBOL(audit_log_start);
1500 EXPORT_SYMBOL(audit_log_end); 1501 EXPORT_SYMBOL(audit_log_end);
1501 EXPORT_SYMBOL(audit_log_format); 1502 EXPORT_SYMBOL(audit_log_format);
1502 EXPORT_SYMBOL(audit_log); 1503 EXPORT_SYMBOL(audit_log);
1503 1504