auditsc.c

	}
	audit_log_format(ab, " ocomm=");
	audit_log_untrustedstring(ab, comm);
	audit_log_end(ab);

	return rc;
}

/*
 * to_send and len_sent accounting are very loose estimates.  We aren't
 * really worried about a hard cap to MAX_EXECVE_AUDIT_LEN so much as being
 * within about 500 bytes (next page boundary)
 *
 * why snprintf?  an int is up to 12 digits long.  if we just assumed when
 * logging that a[%d]= was going to be 16 characters long we would be wasting
 * space in every audit message.  In one 7500 byte message we can log up to
 * about 1000 min size arguments.  That comes down to about 50% waste of space
 * if we didn't do the snprintf to find out how long arg_num_len was.
 */
static int audit_log_single_execve_arg(struct audit_context *context,
					struct audit_buffer **ab,
					int arg_num,
					size_t *len_sent,
					const char __user *p,
					char *buf)
{
	char arg_num_len_buf[12];
	const char __user *tmp_p = p;
	/* how many digits are in arg_num? 5 is the length of ' a=""' */
	size_t arg_num_len = snprintf(arg_num_len_buf, 12, "%d", arg_num) + 5;
	size_t len, len_left, to_send;
	size_t max_execve_audit_len = MAX_EXECVE_AUDIT_LEN;
	unsigned int i, has_cntl = 0, too_long = 0;
	int ret;

	/* strnlen_user includes the null we don't want to send */
	len_left = len = strnlen_user(p, MAX_ARG_STRLEN) - 1;

	/*
	 * We just created this mm, if we can't find the strings
	 * we just copied into it something is _very_ wrong. Similar
	 * for strings that are too long, we should not have created
	 * any.
	 */
	if (unlikely((len == -1) || len > MAX_ARG_STRLEN - 1)) {
		WARN_ON(1);
		send_sig(SIGKILL, current, 0);
		return -1;
	}

	/* walk the whole argument looking for non-ascii chars */
	do {
		if (len_left > MAX_EXECVE_AUDIT_LEN)
			to_send = MAX_EXECVE_AUDIT_LEN;
		else
			to_send = len_left;
		ret = copy_from_user(buf, tmp_p, to_send);
		/*
		 * There is no reason for this copy to be short. We just
		 * copied them here, and the mm hasn't been exposed to user-
		 * space yet.
		 */
		if (ret) {
			WARN_ON(1);
			send_sig(SIGKILL, current, 0);
			return -1;
		}
		buf[to_send] = '\0';
		has_cntl = audit_string_contains_control(buf, to_send);
		if (has_cntl) {
			/*
			 * hex messages get logged as 2 bytes, so we can only
			 * send half as much in each message
			 */
			max_execve_audit_len = MAX_EXECVE_AUDIT_LEN / 2;
			break;
		}
		len_left -= to_send;
		tmp_p += to_send;
	} while (len_left > 0);

	len_left = len;

	if (len > max_execve_audit_len)
		too_long = 1;

	/* rewalk the argument actually logging the message */
	for (i = 0; len_left > 0; i++) {
		int room_left;

		if (len_left > max_execve_audit_len)
			to_send = max_execve_audit_len;
		else
			to_send = len_left;

		/* do we have space left to send this argument in this ab? */
		room_left = MAX_EXECVE_AUDIT_LEN - arg_num_len - *len_sent;
		if (has_cntl)
			room_left -= (to_send * 2);
		else
			room_left -= to_send;
		if (room_left < 0) {
			*len_sent = 0;
			audit_log_end(*ab);
			*ab = audit_log_start(context, GFP_KERNEL, AUDIT_EXECVE);
			if (!*ab)
				return 0;
		}

		/*
		 * first record needs to say how long the original string was
		 * so we can be sure nothing was lost.
		 */
		if ((i == 0) && (too_long))
			audit_log_format(*ab, " a%d_len=%zu", arg_num,
					 has_cntl ? 2*len : len);

		/*
		 * normally arguments are small enough to fit and we already
		 * filled buf above when we checked for control characters
		 * so don't bother with another copy_from_user
		 */
		if (len >= max_execve_audit_len)
			ret = copy_from_user(buf, p, to_send);
		else
			ret = 0;
		if (ret) {
			WARN_ON(1);
			send_sig(SIGKILL, current, 0);
			return -1;
		}
		buf[to_send] = '\0';

		/* actually log it */
		audit_log_format(*ab, " a%d", arg_num);
		if (too_long)
			audit_log_format(*ab, "[%d]", i);
		audit_log_format(*ab, "=");
		if (has_cntl)
			audit_log_n_hex(*ab, buf, to_send);
		else
			audit_log_string(*ab, buf);

		p += to_send;
		len_left -= to_send;
		*len_sent += arg_num_len;
		if (has_cntl)
			*len_sent += to_send * 2;
		else
			*len_sent += to_send;
	}
	/* include the null we didn't log */
	return len + 1;
}

static void audit_log_execve_info(struct audit_context *context,
				  struct audit_buffer **ab)
{
	int i, len;
	size_t len_sent = 0;
	const char __user *p;
	char *buf;

	p = (const char __user *)current->mm->arg_start;

	audit_log_format(*ab, "argc=%d", context->execve.argc);

	/*
	 * we need some kernel buffer to hold the userspace args.  Just
	 * allocate one big one rather than allocating one of the right size
	 * for every single argument inside audit_log_single_execve_arg()
	 * should be <8k allocation so should be pretty safe.
	 */
	buf = kmalloc(MAX_EXECVE_AUDIT_LEN + 1, GFP_KERNEL);
	if (!buf) {
		audit_panic("out of memory for argv string\n");
		return;
	}

	for (i = 0; i < context->execve.argc; i++) {
		len = audit_log_single_execve_arg(context, ab, i,
						  &len_sent, p, buf);
		if (len <= 0)
			break;
		p += len;
	}
	kfree(buf);
}

static void show_special(struct audit_context *context, int *call_panic)
{
	struct audit_buffer *ab;
	int i;

	ab = audit_log_start(context, GFP_KERNEL, context->type);
	if (!ab)
		return;

	switch (context->type) {
	case AUDIT_SOCKETCALL: {
		int nargs = context->socketcall.nargs;
		audit_log_format(ab, "nargs=%d", nargs);
		for (i = 0; i < nargs; i++)
			audit_log_format(ab, " a%d=%lx", i,
				context->socketcall.args[i]);
		break; }
	case AUDIT_IPC: {
		u32 osid = context->ipc.osid;

		audit_log_format(ab, "ouid=%u ogid=%u mode=%#ho",
				 from_kuid(&init_user_ns, context->ipc.uid),
				 from_kgid(&init_user_ns, context->ipc.gid),
				 context->ipc.mode);
		if (osid) {
			char *ctx = NULL;
			u32 len;
			if (security_secid_to_secctx(osid, &ctx, &len)) {
				audit_log_format(ab, " osid=%u", osid);
				*call_panic = 1;
			} else {
				audit_log_format(ab, " obj=%s", ctx);
				security_release_secctx(ctx, len);
			}
		}
		if (context->ipc.has_perm) {
			audit_log_end(ab);
			ab = audit_log_start(context, GFP_KERNEL,
					     AUDIT_IPC_SET_PERM);
			if (unlikely(!ab))
				return;
			audit_log_format(ab,
				"qbytes=%lx ouid=%u ogid=%u mode=%#ho",
				context->ipc.qbytes,
				context->ipc.perm_uid,
				context->ipc.perm_gid,
				context->ipc.perm_mode);
		}
		break; }
	case AUDIT_MQ_OPEN: {
		audit_log_format(ab,
			"oflag=0x%x mode=%#ho mq_flags=0x%lx mq_maxmsg=%ld "
			"mq_msgsize=%ld mq_curmsgs=%ld",
			context->mq_open.oflag, context->mq_open.mode,
			context->mq_open.attr.mq_flags,
			context->mq_open.attr.mq_maxmsg,
			context->mq_open.attr.mq_msgsize,
			context->mq_open.attr.mq_curmsgs);
		break; }
	case AUDIT_MQ_SENDRECV: {
		audit_log_format(ab,
			"mqdes=%d msg_len=%zd msg_prio=%u "
			"abs_timeout_sec=%ld abs_timeout_nsec=%ld",
			context->mq_sendrecv.mqdes,
			context->mq_sendrecv.msg_len,
			context->mq_sendrecv.msg_prio,
			context->mq_sendrecv.abs_timeout.tv_sec,
			context->mq_sendrecv.abs_timeout.tv_nsec);
		break; }
	case AUDIT_MQ_NOTIFY: {
		audit_log_format(ab, "mqdes=%d sigev_signo=%d",
				context->mq_notify.mqdes,
				context->mq_notify.sigev_signo);
		break; }
	case AUDIT_MQ_GETSETATTR: {
		struct mq_attr *attr = &context->mq_getsetattr.mqstat;
		audit_log_format(ab,
			"mqdes=%d mq_flags=0x%lx mq_maxmsg=%ld mq_msgsize=%ld "
			"mq_curmsgs=%ld ",
			context->mq_getsetattr.mqdes,
			attr->mq_flags, attr->mq_maxmsg,
			attr->mq_msgsize, attr->mq_curmsgs);
		break; }
	case AUDIT_CAPSET: {
		audit_log_format(ab, "pid=%d", context->capset.pid);
		audit_log_cap(ab, "cap_pi", &context->capset.cap.inheritable);
		audit_log_cap(ab, "cap_pp", &context->capset.cap.permitted);
		audit_log_cap(ab, "cap_pe", &context->capset.cap.effective);
		break; }
	case AUDIT_MMAP: {
		audit_log_format(ab, "fd=%d flags=0x%x", context->mmap.fd,
				 context->mmap.flags);
		break; }
	case AUDIT_EXECVE: {
		audit_log_execve_info(context, &ab);
		break; }
	}
	audit_log_end(ab);
}

static inline int audit_proctitle_rtrim(char *proctitle, int len)
{
	char *end = proctitle + len - 1;
	while (end > proctitle && !isprint(*end))
		end--;

	/* catch the case where proctitle is only 1 non-print character */
	len = end - proctitle + 1;
	len -= isprint(proctitle[len-1]) == 0;
	return len;
}

static void audit_log_proctitle(struct task_struct *tsk,
			 struct audit_context *context)
{
	int res;
	char *buf;
	char *msg = "(null)";
	int len = strlen(msg);
	struct audit_buffer *ab;

	ab = audit_log_start(context, GFP_KERNEL, AUDIT_PROCTITLE);
	if (!ab)
		return;	/* audit_panic or being filtered */

	audit_log_format(ab, "proctitle=");

	/* Not  cached */
	if (!context->proctitle.value) {
		buf = kmalloc(MAX_PROCTITLE_AUDIT_LEN, GFP_KERNEL);
		if (!buf)
			goto out;
		/* Historically called this from procfs naming */
		res = get_cmdline(tsk, buf, MAX_PROCTITLE_AUDIT_LEN);
		if (res == 0) {
			kfree(buf);
			goto out;
		}
		res = audit_proctitle_rtrim(buf, res);
		if (res == 0) {
			kfree(buf);
			goto out;
		}
		context->proctitle.value = buf;
		context->proctitle.len = res;
	}
	msg = context->proctitle.value;
	len = context->proctitle.len;
out:
	audit_log_n_untrustedstring(ab, msg, len);
	audit_log_end(ab);
}

static void audit_log_exit(struct audit_context *context, struct task_struct *tsk)
{
	int i, call_panic = 0;
	struct audit_buffer *ab;
	struct audit_aux_data *aux;
	struct audit_names *n;

	/* tsk == current */
	context->personality = tsk->personality;

	ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL);
	if (!ab)
		return;		/* audit_panic has been called */
	audit_log_format(ab, "arch=%x syscall=%d",
			 context->arch, context->major);
	if (context->personality != PER_LINUX)
		audit_log_format(ab, " per=%lx", context->personality);
	if (context->return_valid)
		audit_log_format(ab, " success=%s exit=%ld",
				 (context->return_valid==AUDITSC_SUCCESS)?"yes":"no",
				 context->return_code);

	audit_log_format(ab,
			 " a0=%lx a1=%lx a2=%lx a3=%lx items=%d",
			 context->argv[0],
			 context->argv[1],
			 context->argv[2],
			 context->argv[3],
			 context->name_count);

	audit_log_task_info(ab, tsk);
	audit_log_key(ab, context->filterkey);
	audit_log_end(ab);

	for (aux = context->aux; aux; aux = aux->next) {

		ab = audit_log_start(context, GFP_KERNEL, aux->type);
		if (!ab)
			continue; /* audit_panic has been called */

		switch (aux->type) {

		case AUDIT_BPRM_FCAPS: {
			struct audit_aux_data_bprm_fcaps *axs = (void *)aux;
			audit_log_format(ab, "fver=%x", axs->fcap_ver);
			audit_log_cap(ab, "fp", &axs->fcap.permitted);
			audit_log_cap(ab, "fi", &axs->fcap.inheritable);
			audit_log_format(ab, " fe=%d", axs->fcap.fE);
			audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted);
			audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable);
			audit_log_cap(ab, "old_pe", &axs->old_pcap.effective);
			audit_log_cap(ab, "new_pp", &axs->new_pcap.permitted);
			audit_log_cap(ab, "new_pi", &axs->new_pcap.inheritable);
			audit_log_cap(ab, "new_pe", &axs->new_pcap.effective);
			break; }

		}
		audit_log_end(ab);
	}

	if (context->type)
		show_special(context, &call_panic);

	if (context->fds[0] >= 0) {
		ab = audit_log_start(context, GFP_KERNEL, AUDIT_FD_PAIR);
		if (ab) {
			audit_log_format(ab, "fd0=%d fd1=%d",
					context->fds[0], context->fds[1]);
			audit_log_end(ab);
		}
	}

	if (context->sockaddr_len) {
		ab = audit_log_start(context, GFP_KERNEL, AUDIT_SOCKADDR);
		if (ab) {
			audit_log_format(ab, "saddr=");
			audit_log_n_hex(ab, (void *)context->sockaddr,
					context->sockaddr_len);
			audit_log_end(ab);
		}
	}

	for (aux = context->aux_pids; aux; aux = aux->next) {
		struct audit_aux_data_pids *axs = (void *)aux;

		for (i = 0; i < axs->pid_count; i++)
			if (audit_log_pid_context(context, axs->target_pid[i],
						  axs->target_auid[i],
						  axs->target_uid[i],
						  axs->target_sessionid[i],
						  axs->target_sid[i],
						  axs->target_comm[i]))
				call_panic = 1;
	}

	if (context->target_pid &&
	    audit_log_pid_context(context, context->target_pid,
				  context->target_auid, context->target_uid,
				  context->target_sessionid,
				  context->target_sid, context->target_comm))
			call_panic = 1;

	if (context->pwd.dentry && context->pwd.mnt) {
		ab = audit_log_start(context, GFP_KERNEL, AUDIT_CWD);
		if (ab) {
			audit_log_d_path(ab, " cwd=", &context->pwd);
			audit_log_end(ab);
		}
	}

	i = 0;
	list_for_each_entry(n, &context->names_list, list) {
		if (n->hidden)
			continue;
		audit_log_name(context, n, NULL, i++, &call_panic);
	}

	audit_log_proctitle(tsk, context);

	/* Send end of event record to help user space know we are finished */
	ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE);
	if (ab)
		audit_log_end(ab);
	if (call_panic)
		audit_panic("error converting sid to string");
}

/**
 * audit_free - free a per-task audit context
 * @tsk: task whose audit context block to free
 *
 * Called from copy_process and do_exit
 */
void __audit_free(struct task_struct *tsk)
{
	struct audit_context *context;

	context = audit_take_context(tsk, 0, 0);
	if (!context)
		return;

	/* Check for system calls that do not go through the exit
	 * function (e.g., exit_group), then free context block.
	 * We use GFP_ATOMIC here because we might be doing this
	 * in the context of the idle thread */
	/* that can happen only if we are called from do_exit() */
	if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT)
		audit_log_exit(context, tsk);
	if (!list_empty(&context->killed_trees))
		audit_kill_trees(&context->killed_trees);

	audit_free_context(context);
}

/**
 * audit_syscall_entry - fill in an audit record at syscall entry
 * @arch: architecture type
 * @major: major syscall type (function)
 * @a1: additional syscall register 1
 * @a2: additional syscall register 2
 * @a3: additional syscall register 3
 * @a4: additional syscall register 4
 *
 * Fill in audit context at syscall entry.  This only happens if the
 * audit context was created when the task was created and the state or
 * filters demand the audit context be built.  If the state from the
 * per-task filter or from the per-syscall filter is AUDIT_RECORD_CONTEXT,
 * then the record will be written at syscall exit time (otherwise, it
 * will only be written if another part of the kernel requests that it
 * be written).
 */
void __audit_syscall_entry(int arch, int major,
			 unsigned long a1, unsigned long a2,
			 unsigned long a3, unsigned long a4)
{
	struct task_struct *tsk = current;
	struct audit_context *context = tsk->audit_context;
	enum audit_state     state;

	if (!context)
		return;

	BUG_ON(context->in_syscall || context->name_count);

	if (!audit_enabled)
		return;

	context->arch	    = arch;
	context->major      = major;
	context->argv[0]    = a1;
	context->argv[1]    = a2;
	context->argv[2]    = a3;
	context->argv[3]    = a4;

	state = context->state;
	context->dummy = !audit_n_rules;
	if (!context->dummy && state == AUDIT_BUILD_CONTEXT) {
		context->prio = 0;
		state = audit_filter_syscall(tsk, context, &audit_filter_list[AUDIT_FILTER_ENTRY]);
	}
	if (state == AUDIT_DISABLED)
		return;

	context->serial     = 0;
	context->ctime      = CURRENT_TIME;
	context->in_syscall = 1;
	context->current_state  = state;
	context->ppid       = 0;
}

/**
 * audit_syscall_exit - deallocate audit context after a system call
 * @success: success value of the syscall
 * @return_code: return value of the syscall
 *
 * Tear down after system call.  If the audit context has been marked as
 * auditable (either because of the AUDIT_RECORD_CONTEXT state from
 * filtering, or because some other part of the kernel wrote an audit
 * message), then write out the syscall information.  In call cases,
 * free the names stored from getname().
 */
void __audit_syscall_exit(int success, long return_code)
{
	struct task_struct *tsk = current;
	struct audit_context *context;

	if (success)
		success = AUDITSC_SUCCESS;
	else
		success = AUDITSC_FAILURE;

	context = audit_take_context(tsk, success, return_code);
	if (!context)
		return;

	if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT)
		audit_log_exit(context, tsk);

	context->in_syscall = 0;
	context->prio = context->state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0;

	if (!list_empty(&context->killed_trees))
		audit_kill_trees(&context->killed_trees);

	audit_free_names(context);
	unroll_tree_refs(context, NULL, 0);
	audit_free_aux(context);
	context->aux = NULL;
	context->aux_pids = NULL;
	context->target_pid = 0;
	context->target_sid = 0;
	context->sockaddr_len = 0;
	context->type = 0;
	context->fds[0] = -1;
	if (context->state != AUDIT_RECORD_CONTEXT) {
		kfree(context->filterkey);
		context->filterkey = NULL;
	}
	tsk->audit_context = context;
}

static inline void handle_one(const struct inode *inode)
{
#ifdef CONFIG_AUDIT_TREE
	struct audit_context *context;
	struct audit_tree_refs *p;
	struct audit_chunk *chunk;
	int count;
	if (likely(hlist_empty(&inode->i_fsnotify_marks)))
		return;
	context = current->audit_context;
	p = context->trees;
	count = context->tree_count;
	rcu_read_lock();
	chunk = audit_tree_lookup(inode);
	rcu_read_unlock();
	if (!chunk)
		return;
	if (likely(put_tree_ref(context, chunk)))
		return;
	if (unlikely(!grow_tree_refs(context))) {
		pr_warn("out of memory, audit has lost a tree reference\n");
		audit_set_auditable(context);
		audit_put_chunk(chunk);
		unroll_tree_refs(context, p, count);
		return;
	}
	put_tree_ref(context, chunk);
#endif
}

static void handle_path(const struct dentry *dentry)
{
#ifdef CONFIG_AUDIT_TREE
	struct audit_context *context;
	struct audit_tree_refs *p;
	const struct dentry *d, *parent;
	struct audit_chunk *drop;
	unsigned long seq;
	int count;

	context = current->audit_context;
	p = context->trees;
	count = context->tree_count;
retry:
	drop = NULL;
	d = dentry;
	rcu_read_lock();
	seq = read_seqbegin(&rename_lock);
	for(;;) {
		struct inode *inode = d->d_inode;
		if (inode && unlikely(!hlist_empty(&inode->i_fsnotify_marks))) {
			struct audit_chunk *chunk;
			chunk = audit_tree_lookup(inode);
			if (chunk) {
				if (unlikely(!put_tree_ref(context, chunk))) {
					drop = chunk;
					break;
				}
			}
		}
		parent = d->d_parent;
		if (parent == d)
			break;
		d = parent;
	}
	if (unlikely(read_seqretry(&rename_lock, seq) || drop)) {  /* in this order */
		rcu_read_unlock();
		if (!drop) {
			/* just a race with rename */
			unroll_tree_refs(context, p, count);
			goto retry;
		}
		audit_put_chunk(drop);
		if (grow_tree_refs(context)) {
			/* OK, got more space */
			unroll_tree_refs(context, p, count);
			goto retry;
		}
		/* too bad */
		pr_warn("out of memory, audit has lost a tree reference\n");
		unroll_tree_refs(context, p, count);
		audit_set_auditable(context);
		return;
	}
	rcu_read_unlock();
#endif
}

static struct audit_names *audit_alloc_name(struct audit_context *context,
						unsigned char type)
{
	struct audit_names *aname;

	if (context->name_count < AUDIT_NAMES) {
		aname = &context->preallocated_names[context->name_count];
		memset(aname, 0, sizeof(*aname));
	} else {
		aname = kzalloc(sizeof(*aname), GFP_NOFS);
		if (!aname)
			return NULL;
		aname->should_free = true;
	}

	aname->ino = (unsigned long)-1;
	aname->type = type;
	list_add_tail(&aname->list, &context->names_list);

	context->name_count++;
#if AUDIT_DEBUG
	context->ino_count++;
#endif
	return aname;
}

/**
 * audit_reusename - fill out filename with info from existing entry
 * @uptr: userland ptr to pathname
 *
 * Search the audit_names list for the current audit context. If there is an
 * existing entry with a matching "uptr" then return the filename
 * associated with that audit_name. If not, return NULL.
 */
struct filename *
__audit_reusename(const __user char *uptr)
{
	struct audit_context *context = current->audit_context;
	struct audit_names *n;

	list_for_each_entry(n, &context->names_list, list) {
		if (!n->name)
			continue;
		if (n->name->uptr == uptr)
			return n->name;
	}
	return NULL;
}

/**
 * audit_getname - add a name to the list
 * @name: name to add
 *
 * Add a name to the list of audit names for this context.
 * Called from fs/namei.c:getname().
 */
void __audit_getname(struct filename *name)
{
	struct audit_context *context = current->audit_context;
	struct audit_names *n;

	if (!context->in_syscall) {
#if AUDIT_DEBUG == 2
		pr_err("%s:%d(:%d): ignoring getname(%p)\n",
		       __FILE__, __LINE__, context->serial, name);
		dump_stack();
#endif
		return;
	}

#if AUDIT_DEBUG
	/* The filename _must_ have a populated ->name */
	BUG_ON(!name->name);
#endif

	n = audit_alloc_name(context, AUDIT_TYPE_UNKNOWN);
	if (!n)
		return;

	n->name = name;
	n->name_len = AUDIT_NAME_FULL;
	n->name_put = true;
	name->aname = n;

	if (!context->pwd.dentry)
		get_fs_pwd(current->fs, &context->pwd);
}

/* audit_putname - intercept a putname request
 * @name: name to intercept and delay for putname
 *
 * If we have stored the name from getname in the audit context,
 * then we delay the putname until syscall exit.
 * Called from include/linux/fs.h:putname().
 */
void audit_putname(struct filename *name)
{
	struct audit_context *context = current->audit_context;

	BUG_ON(!context);
	if (!context->in_syscall) {
#if AUDIT_DEBUG == 2
		pr_err("%s:%d(:%d): final_putname(%p)\n",
		       __FILE__, __LINE__, context->serial, name);
		if (context->name_count) {
			struct audit_names *n;
			int i = 0;

			list_for_each_entry(n, &context->names_list, list)
				pr_err("name[%d] = %p = %s\n", i++, n->name,
				       n->name->name ?: "(null)");
			}
#endif
		final_putname(name);
	}
#if AUDIT_DEBUG
	else {
		++context->put_count;
		if (context->put_count > context->name_count) {
			pr_err("%s:%d(:%d): major=%d in_syscall=%d putname(%p)"
			       " name_count=%d put_count=%d\n",
			       __FILE__, __LINE__,
			       context->serial, context->major,
			       context->in_syscall, name->name,
			       context->name_count, context->put_count);
			dump_stack();
		}
	}
#endif
}

/**
 * __audit_inode - store the inode and device from a lookup
 * @name: name being audited
 * @dentry: dentry being audited
 * @flags: attributes for this particular entry
 */
void __audit_inode(struct filename *name, const struct dentry *dentry,
		   unsigned int flags)
{
	struct audit_context *context = current->audit_context;
	const struct inode *inode = dentry->d_inode;
	struct audit_names *n;
	bool parent = flags & AUDIT_INODE_PARENT;

	if (!context->in_syscall)
		return;

	if (!name)
		goto out_alloc;

#if AUDIT_DEBUG
	/* The struct filename _must_ have a populated ->name */
	BUG_ON(!name->name);
#endif
	/*
	 * If we have a pointer to an audit_names entry already, then we can
	 * just use it directly if the type is correct.
	 */
	n = name->aname;
	if (n) {
		if (parent) {
			if (n->type == AUDIT_TYPE_PARENT ||
			    n->type == AUDIT_TYPE_UNKNOWN)
				goto out;
		} else {
			if (n->type != AUDIT_TYPE_PARENT)
				goto out;
		}
	}

	list_for_each_entry_reverse(n, &context->names_list, list) {
		/* does the name pointer match? */
		if (!n->name || n->name->name != name->name)
			continue;

		/* match the correct record type */
		if (parent) {
			if (n->type == AUDIT_TYPE_PARENT ||
			    n->type == AUDIT_TYPE_UNKNOWN)
				goto out;
		} else {
			if (n->type != AUDIT_TYPE_PARENT)
				goto out;
		}
	}

out_alloc:
	/* unable to find the name from a previous getname(). Allocate a new
	 * anonymous entry.
	 */
	n = audit_alloc_name(context, AUDIT_TYPE_NORMAL);
	if (!n)
		return;
out:
	if (parent) {
		n->name_len = n->name ? parent_len(n->name->name) : AUDIT_NAME_FULL;
		n->type = AUDIT_TYPE_PARENT;
		if (flags & AUDIT_INODE_HIDDEN)
			n->hidden = true;
	} else {
		n->name_len = AUDIT_NAME_FULL;
		n->type = AUDIT_TYPE_NORMAL;
	}
	handle_path(dentry);
	audit_copy_inode(n, dentry, inode);
}

/**
 * __audit_inode_child - collect inode info for created/removed objects
 * @parent: inode of dentry parent
 * @dentry: dentry being audited
 * @type:   AUDIT_TYPE_* value that we're looking for
 *
 * For syscalls that create or remove filesystem objects, audit_inode
 * can only collect information for the filesystem object's parent.
 * This call updates the audit context with the child's information.
 * Syscalls that create a new filesystem object must be hooked after
 * the object is created.  Syscalls that remove a filesystem object
 * must be hooked prior, in order to capture the target inode during
 * unsuccessful attempts.
 */
void __audit_inode_child(const struct inode *parent,
			 const struct dentry *dentry,
			 const unsigned char type)
{
	struct audit_context *context = current->audit_context;
	const struct inode *inode = dentry->d_inode;
	const char *dname = dentry->d_name.name;
	struct audit_names *n, *found_parent = NULL, *found_child = NULL;

	if (!context->in_syscall)
		return;

	if (inode)
		handle_one(inode);

	/* look for a parent entry first */
	list_for_each_entry(n, &context->names_list, list) {
		if (!n->name || n->type != AUDIT_TYPE_PARENT)
			continue;

		if (n->ino == parent->i_ino &&
		    !audit_compare_dname_path(dname, n->name->name, n->name_len)) {
			found_parent = n;
			break;
		}
	}

	/* is there a matching child entry? */
	list_for_each_entry(n, &context->names_list, list) {
		/* can only match entries that have a name */
		if (!n->name || n->type != type)
			continue;

		/* if we found a parent, make sure this one is a child of it */
		if (found_parent && (n->name != found_parent->name))
			continue;

		if (!strcmp(dname, n->name->name) ||
		    !audit_compare_dname_path(dname, n->name->name,
						found_parent ?
						found_parent->name_len :
						AUDIT_NAME_FULL)) {
			found_child = n;
			break;
		}
	}

	if (!found_parent) {
		/* create a new, "anonymous" parent record */
		n = audit_alloc_name(context, AUDIT_TYPE_PARENT);
		if (!n)
			return;
		audit_copy_inode(n, NULL, parent);
	}

	if (!found_child) {
		found_child = audit_alloc_name(context, type);
		if (!found_child)
			return;

		/* Re-use the name belonging to the slot for a matching parent
		 * directory. All names for this context are relinquished in
		 * audit_free_names() */
		if (found_parent) {
			found_child->name = found_parent->name;
			found_child->name_len = AUDIT_NAME_FULL;
			/* don't call __putname() */
			found_child->name_put = false;
		}
	}
	if (inode)
		audit_copy_inode(found_child, dentry, inode);
	else
		found_child->ino = (unsigned long)-1;
}
EXPORT_SYMBOL_GPL(__audit_inode_child);

/**
 * auditsc_get_stamp - get local copies of audit_context values
 * @ctx: audit_context for the task
 * @t: timespec to store time recorded in the audit_context
 * @serial: serial value that is recorded in the audit_context
 *
 * Also sets the context as auditable.
 */
int auditsc_get_stamp(struct audit_context *ctx,
		       struct timespec *t, unsigned int *serial)