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1a59d1b8 1/* SPDX-License-Identifier: GPL-2.0-or-later */
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2/* audit -- definition of audit_context structure and supporting types
3 *
4 * Copyright 2003-2004 Red Hat, Inc.
5 * Copyright 2005 Hewlett-Packard Development Company, L.P.
6 * Copyright 2005 IBM Corporation
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7 */
8
9#include <linux/fs.h>
10#include <linux/audit.h>
9044e6bc 11#include <linux/skbuff.h>
ab9c17a8 12#include <linux/security.h>
b24a30a7 13#include <uapi/linux/mqueue.h>
3f5be2da 14#include <linux/tty.h>
fe7752ba 15
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16/* AUDIT_NAMES is the number of slots we reserve in the audit_context
17 * for saving names from getname(). If we get more names we will allocate
18 * a name dynamically and also add those to the list anchored by names_list. */
19#define AUDIT_NAMES 5
20
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21/* At task start time, the audit_state is set in the audit_context using
22 a per-task filter. At syscall entry, the audit_state is augmented by
23 the syscall filter. */
24enum audit_state {
25 AUDIT_DISABLED, /* Do not create per-task audit_context.
26 * No syscall-specific audit records can
27 * be generated. */
fe7752ba 28 AUDIT_BUILD_CONTEXT, /* Create the per-task audit_context,
997f5b64 29 * and fill it in at syscall
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30 * entry time. This makes a full
31 * syscall record available if some
32 * other part of the kernel decides it
33 * should be recorded. */
34 AUDIT_RECORD_CONTEXT /* Create the per-task audit_context,
35 * always fill it in at syscall entry
36 * time, and always write out the audit
37 * record at syscall exit time. */
38};
39
40/* Rule lists */
cfcad62c 41struct audit_watch;
7f492942 42struct audit_fsnotify_mark;
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43struct audit_tree;
44struct audit_chunk;
45
fe7752ba 46struct audit_entry {
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47 struct list_head list;
48 struct rcu_head rcu;
49 struct audit_krule rule;
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50};
51
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52struct audit_cap_data {
53 kernel_cap_t permitted;
54 kernel_cap_t inheritable;
55 union {
56 unsigned int fE; /* effective bit of file cap */
57 kernel_cap_t effective; /* effective set of process */
58 };
7786f6b6 59 kernel_cap_t ambient;
2fec30e2 60 kuid_t rootid;
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61};
62
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63/* When fs/namei.c:getname() is called, we store the pointer in name and bump
64 * the refcnt in the associated filename struct.
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65 *
66 * Further, in fs/namei.c:path_lookup() we store the inode and device.
67 */
68struct audit_names {
69 struct list_head list; /* audit_context->names_list */
70
71 struct filename *name;
72 int name_len; /* number of chars to log */
79f6530c 73 bool hidden; /* don't log this record */
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74
75 unsigned long ino;
76 dev_t dev;
77 umode_t mode;
78 kuid_t uid;
79 kgid_t gid;
80 dev_t rdev;
b2f933b2 81 struct lsmblob oblob;
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82 struct audit_cap_data fcap;
83 unsigned int fcap_ver;
84 unsigned char type; /* record type */
85 /*
86 * This was an allocated audit_names and not from the array of
87 * names allocated in the task audit context. Thus this name
88 * should be freed on syscall exit.
89 */
90 bool should_free;
91};
92
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93struct audit_proctitle {
94 int len; /* length of the cmdline field. */
95 char *value; /* the cmdline field */
96};
97
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98/* The per-task audit context. */
99struct audit_context {
100 int dummy; /* must be the first element */
101 int in_syscall; /* 1 if task is in a syscall */
102 enum audit_state state, current_state;
103 unsigned int serial; /* serial number for record */
104 int major; /* syscall number */
2115bb25 105 struct timespec64 ctime; /* time of syscall entry */
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106 unsigned long argv[4]; /* syscall arguments */
107 long return_code;/* syscall return code */
108 u64 prio;
109 int return_valid; /* return code is valid */
110 /*
111 * The names_list is the list of all audit_names collected during this
112 * syscall. The first AUDIT_NAMES entries in the names_list will
113 * actually be from the preallocated_names array for performance
114 * reasons. Except during allocation they should never be referenced
115 * through the preallocated_names array and should only be found/used
116 * by running the names_list.
117 */
118 struct audit_names preallocated_names[AUDIT_NAMES];
119 int name_count; /* total records in names_list */
120 struct list_head names_list; /* struct audit_names->list anchor */
121 char *filterkey; /* key for rule that triggered record */
122 struct path pwd;
123 struct audit_aux_data *aux;
124 struct audit_aux_data *aux_pids;
125 struct sockaddr_storage *sockaddr;
126 size_t sockaddr_len;
127 /* Save things to print about task_struct */
128 pid_t pid, ppid;
129 kuid_t uid, euid, suid, fsuid;
130 kgid_t gid, egid, sgid, fsgid;
131 unsigned long personality;
132 int arch;
133
134 pid_t target_pid;
135 kuid_t target_auid;
136 kuid_t target_uid;
137 unsigned int target_sessionid;
ab9c17a8 138 struct lsmblob target_lsm;
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139 char target_comm[TASK_COMM_LEN];
140
141 struct audit_tree_refs *trees, *first_trees;
142 struct list_head killed_trees;
143 int tree_count;
144
145 int type;
146 union {
147 struct {
148 int nargs;
149 long args[6];
150 } socketcall;
151 struct {
152 kuid_t uid;
153 kgid_t gid;
154 umode_t mode;
b2f933b2 155 struct lsmblob oblob;
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156 int has_perm;
157 uid_t perm_uid;
158 gid_t perm_gid;
159 umode_t perm_mode;
160 unsigned long qbytes;
161 } ipc;
162 struct {
163 mqd_t mqdes;
164 struct mq_attr mqstat;
165 } mq_getsetattr;
166 struct {
167 mqd_t mqdes;
168 int sigev_signo;
169 } mq_notify;
170 struct {
171 mqd_t mqdes;
172 size_t msg_len;
173 unsigned int msg_prio;
b9047726 174 struct timespec64 abs_timeout;
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175 } mq_sendrecv;
176 struct {
177 int oflag;
178 umode_t mode;
179 struct mq_attr attr;
180 } mq_open;
181 struct {
182 pid_t pid;
183 struct audit_cap_data cap;
184 } capset;
185 struct {
186 int fd;
187 int flags;
188 } mmap;
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189 struct {
190 int argc;
d9cfea91 191 } execve;
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192 struct {
193 char *name;
194 } module;
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195 };
196 int fds[2];
3f1c8250 197 struct audit_proctitle proctitle;
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198};
199
b3b4fdf6 200extern bool audit_ever_enabled;
c782f242 201
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202extern void audit_log_session_info(struct audit_buffer *ab);
203
b6c7c115 204extern int auditd_test_task(struct task_struct *task);
fe7752ba 205
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206#define AUDIT_INODE_BUCKETS 32
207extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
208
209static inline int audit_hash_ino(u32 ino)
210{
211 return (ino & (AUDIT_INODE_BUCKETS-1));
212}
213
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214/* Indicates that audit should log the full pathname. */
215#define AUDIT_NAME_FULL -1
216
55669bfa 217extern int audit_match_class(int class, unsigned syscall);
f368c07d 218extern int audit_comparator(const u32 left, const u32 op, const u32 right);
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219extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right);
220extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right);
bfcec708 221extern int parent_len(const char *path);
795d673a 222extern int audit_compare_dname_path(const struct qstr *dname, const char *path, int plen);
45a0642b 223extern struct sk_buff *audit_make_reply(int seq, int type, int done, int multi,
f9441639 224 const void *payload, int size);
fe7752ba 225extern void audit_panic(const char *message);
3dc7e315 226
9044e6bc 227struct audit_netlink_list {
f9441639 228 __u32 portid;
638a0fd2 229 struct net *net;
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230 struct sk_buff_head q;
231};
232
3054d067 233int audit_send_list_thread(void *_dest);
9044e6bc 234
3dc7e315 235extern int selinux_audit_rule_update(void);
e1396065 236
74c3cbe3 237extern struct mutex audit_filter_mutex;
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238extern int audit_del_rule(struct audit_entry *entry);
239extern void audit_free_rule_rcu(struct rcu_head *head);
c782f242 240extern struct list_head audit_filter_list[];
74c3cbe3 241
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242extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
243
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244extern void audit_log_d_path_exe(struct audit_buffer *ab,
245 struct mm_struct *mm);
246
2a1fe215 247extern struct tty_struct *audit_get_tty(void);
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248extern void audit_put_tty(struct tty_struct *tty);
249
05c7a9cb 250/* audit watch/mark/tree functions */
c8fc5d49 251#ifdef CONFIG_AUDITSYSCALL
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252extern unsigned int audit_serial(void);
253extern int auditsc_get_stamp(struct audit_context *ctx,
254 struct timespec64 *t, unsigned int *serial);
255
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256extern void audit_put_watch(struct audit_watch *watch);
257extern void audit_get_watch(struct audit_watch *watch);
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258extern int audit_to_watch(struct audit_krule *krule, char *path, int len,
259 u32 op);
ae7b8f41 260extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
a05fb6cc 261extern void audit_remove_watch_rule(struct audit_krule *krule);
cfcad62c 262extern char *audit_watch_path(struct audit_watch *watch);
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263extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino,
264 dev_t dev);
7f492942 265
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266extern struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule,
267 char *pathname, int len);
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268extern char *audit_mark_path(struct audit_fsnotify_mark *mark);
269extern void audit_remove_mark(struct audit_fsnotify_mark *audit_mark);
270extern void audit_remove_mark_rule(struct audit_krule *krule);
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271extern int audit_mark_compare(struct audit_fsnotify_mark *mark,
272 unsigned long ino, dev_t dev);
34d99af5 273extern int audit_dupe_exe(struct audit_krule *new, struct audit_krule *old);
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274extern int audit_exe_compare(struct task_struct *tsk,
275 struct audit_fsnotify_mark *mark);
7f492942 276
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277extern struct audit_chunk *audit_tree_lookup(const struct inode *inode);
278extern void audit_put_chunk(struct audit_chunk *chunk);
279extern bool audit_tree_match(struct audit_chunk *chunk,
280 struct audit_tree *tree);
281extern int audit_make_tree(struct audit_krule *rule, char *pathname, u32 op);
282extern int audit_add_tree_rule(struct audit_krule *rule);
283extern int audit_remove_tree_rule(struct audit_krule *rule);
284extern void audit_trim_trees(void);
285extern int audit_tag_tree(char *old, char *new);
286extern const char *audit_tree_path(struct audit_tree *tree);
287extern void audit_put_tree(struct audit_tree *tree);
288extern void audit_kill_trees(struct audit_context *context);
289
b48345aa 290extern int audit_signal_info_syscall(struct task_struct *t);
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291extern void audit_filter_inodes(struct task_struct *tsk,
292 struct audit_context *ctx);
293extern struct list_head *audit_killed_trees(void);
294#else /* CONFIG_AUDITSYSCALL */
cd108b5c 295#define auditsc_get_stamp(c, t, s) 0
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296#define audit_put_watch(w) {}
297#define audit_get_watch(w) {}
298#define audit_to_watch(k, p, l, o) (-EINVAL)
299#define audit_add_watch(k, l) (-EINVAL)
300#define audit_remove_watch_rule(k) BUG()
301#define audit_watch_path(w) ""
302#define audit_watch_compare(w, i, d) 0
303
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304#define audit_alloc_mark(k, p, l) (ERR_PTR(-EINVAL))
305#define audit_mark_path(m) ""
306#define audit_remove_mark(m)
307#define audit_remove_mark_rule(k)
308#define audit_mark_compare(m, i, d) 0
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309#define audit_exe_compare(t, m) (-EINVAL)
310#define audit_dupe_exe(n, o) (-EINVAL)
cfcad62c 311
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312#define audit_remove_tree_rule(rule) BUG()
313#define audit_add_tree_rule(rule) -EINVAL
314#define audit_make_tree(rule, str, op) -EINVAL
315#define audit_trim_trees() (void)0
316#define audit_put_tree(tree) (void)0
317#define audit_tag_tree(old, new) -EINVAL
318#define audit_tree_path(rule) "" /* never called */
9e36a5d4 319#define audit_kill_trees(context) BUG()
05c7a9cb 320
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321static inline int audit_signal_info_syscall(struct task_struct *t)
322{
323 return 0;
324}
325
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326#define audit_filter_inodes(t, c) AUDIT_DISABLED
327#endif /* CONFIG_AUDITSYSCALL */
74c3cbe3 328
e4c1a0d1 329extern char *audit_unpack_string(void **bufp, size_t *remain, size_t len);
74c3cbe3 330
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331extern struct lsmblob audit_sig_lsm;
332
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333extern int audit_filter(int msgtype, unsigned int listtype);
334
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335extern void audit_ctl_lock(void);
336extern void audit_ctl_unlock(void);