Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Creating audit events from TTY input.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2007 Red Hat, Inc.  All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Authors: Miloslav Trmac <mitr@redhat.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/audit.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/tty.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) struct tty_audit_buf {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 	struct mutex mutex;	/* Protects all data below */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 	dev_t dev;		/* The TTY which the data is from */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 	unsigned icanon:1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 	size_t valid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 	unsigned char *data;	/* Allocated size N_TTY_BUF_SIZE */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) static struct tty_audit_buf *tty_audit_buf_ref(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	struct tty_audit_buf *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	buf = current->signal->tty_audit_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	WARN_ON(buf == ERR_PTR(-ESRCH));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	return buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) static struct tty_audit_buf *tty_audit_buf_alloc(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	struct tty_audit_buf *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	buf = kmalloc(sizeof(*buf), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	if (!buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 		goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	buf->data = kmalloc(N_TTY_BUF_SIZE, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	if (!buf->data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		goto err_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	mutex_init(&buf->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	buf->dev = MKDEV(0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	buf->icanon = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	buf->valid = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	return buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) err_buf:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	kfree(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) static void tty_audit_buf_free(struct tty_audit_buf *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	WARN_ON(buf->valid != 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	kfree(buf->data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	kfree(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) static void tty_audit_log(const char *description, dev_t dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 			  unsigned char *data, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	struct audit_buffer *ab;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	pid_t pid = task_pid_nr(current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	uid_t uid = from_kuid(&init_user_ns, task_uid(current));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	uid_t loginuid = from_kuid(&init_user_ns, audit_get_loginuid(current));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	unsigned int sessionid = audit_get_sessionid(current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_TTY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	if (ab) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		char name[sizeof(current->comm)];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		audit_log_format(ab, "%s pid=%u uid=%u auid=%u ses=%u major=%d"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 				 " minor=%d comm=", description, pid, uid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 				 loginuid, sessionid, MAJOR(dev), MINOR(dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		get_task_comm(name, current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		audit_log_untrustedstring(ab, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		audit_log_format(ab, " data=");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		audit_log_n_hex(ab, data, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		audit_log_end(ab);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85)  *	tty_audit_buf_push	-	Push buffered data out
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87)  *	Generate an audit message from the contents of @buf, which is owned by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88)  *	the current task.  @buf->mutex must be locked.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) static void tty_audit_buf_push(struct tty_audit_buf *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	if (buf->valid == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	if (audit_enabled == AUDIT_OFF) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		buf->valid = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	tty_audit_log("tty", buf->dev, buf->data, buf->valid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	buf->valid = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)  *	tty_audit_exit	-	Handle a task exit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)  *	Make sure all buffered data is written out and deallocate the buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)  *	Only needs to be called if current->signal->tty_audit_buf != %NULL.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)  *	The process is single-threaded at this point; no other threads share
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)  *	current->signal.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) void tty_audit_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	struct tty_audit_buf *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	buf = xchg(&current->signal->tty_audit_buf, ERR_PTR(-ESRCH));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	if (!buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	tty_audit_buf_push(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	tty_audit_buf_free(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)  *	tty_audit_fork	-	Copy TTY audit state for a new task
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)  *	Set up TTY audit state in @sig from current.  @sig needs no locking.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) void tty_audit_fork(struct signal_struct *sig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	sig->audit_tty = current->signal->audit_tty;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)  *	tty_audit_tiocsti	-	Log TIOCSTI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) void tty_audit_tiocsti(struct tty_struct *tty, char ch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	dev_t dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	dev = MKDEV(tty->driver->major, tty->driver->minor_start) + tty->index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	if (tty_audit_push())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	if (audit_enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		tty_audit_log("ioctl=TIOCSTI", dev, &ch, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)  *	tty_audit_push	-	Flush current's pending audit data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)  *	Returns 0 if success, -EPERM if tty audit is disabled
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) int tty_audit_push(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	struct tty_audit_buf *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	if (~current->signal->audit_tty & AUDIT_TTY_ENABLE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	buf = tty_audit_buf_ref();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	if (!IS_ERR_OR_NULL(buf)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		mutex_lock(&buf->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		tty_audit_buf_push(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		mutex_unlock(&buf->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)  *	tty_audit_buf_get	-	Get an audit buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)  *	Get an audit buffer, allocate it if necessary.  Return %NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)  *	if out of memory or ERR_PTR(-ESRCH) if tty_audit_exit() has already
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)  *	occurred.  Otherwise, return a new reference to the buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) static struct tty_audit_buf *tty_audit_buf_get(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	struct tty_audit_buf *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	buf = tty_audit_buf_ref();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	if (buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		return buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	buf = tty_audit_buf_alloc();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	if (buf == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		audit_log_lost("out of memory in TTY auditing");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	/* Race to use this buffer, free it if another wins */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	if (cmpxchg(&current->signal->tty_audit_buf, NULL, buf) != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		tty_audit_buf_free(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	return tty_audit_buf_ref();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)  *	tty_audit_add_data	-	Add data for TTY auditing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)  *	Audit @data of @size from @tty, if necessary.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) void tty_audit_add_data(struct tty_struct *tty, const void *data, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	struct tty_audit_buf *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	unsigned int icanon = !!L_ICANON(tty);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	unsigned int audit_tty;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	dev_t dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	audit_tty = READ_ONCE(current->signal->audit_tty);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	if (~audit_tty & AUDIT_TTY_ENABLE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	if (unlikely(size == 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	if (tty->driver->type == TTY_DRIVER_TYPE_PTY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	    && tty->driver->subtype == PTY_TYPE_MASTER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	if ((~audit_tty & AUDIT_TTY_LOG_PASSWD) && icanon && !L_ECHO(tty))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	buf = tty_audit_buf_get();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	if (IS_ERR_OR_NULL(buf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	mutex_lock(&buf->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	dev = MKDEV(tty->driver->major, tty->driver->minor_start) + tty->index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	if (buf->dev != dev || buf->icanon != icanon) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		tty_audit_buf_push(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		buf->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		buf->icanon = icanon;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		size_t run;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		run = N_TTY_BUF_SIZE - buf->valid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		if (run > size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 			run = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		memcpy(buf->data + buf->valid, data, run);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 		buf->valid += run;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		data += run;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		size -= run;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		if (buf->valid == N_TTY_BUF_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 			tty_audit_buf_push(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	} while (size != 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	mutex_unlock(&buf->mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) }