Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linuxgrafted

Pull I3C updates from Alexandre Belloni:
 "A new driver this cycle, for the AMD AXI I3C controller.

  There are also new features such as IBI wakeup support, SETAASA device
  discovery and ACPI support for the the DAA methods, meaning we can now
  communicate with the SPD devices on DDR5 modules.

  New driver:
   - AMD AXI I3C master controller

  Subsystem:
   - I3C Common Command Code (CCC) handling improvements, especially
     around GET CCCs
   - SETAASA device discovery support
   - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as
     well as I2C devices on I3C bus
   - IBI-based wakeup support

  Drivers:
   - dw: SETAASA support
   - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C
     controller support, PIO queue management support for HCI v1.2
   - renesas: improve suspend to RAM support, add runtime PM support"

* tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits)
  i3c: dw: reduce do_daa time if there's no client
  i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller
  i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2
  i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode
  i3c: dw: rename "pclk" to "apb" to match dt-binding
  i3c: dw: make struct dw_i3c_cmd smaller
  i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding
  i3c: renesas: Don't register devices when ENTDAA times out
  i3c: master: dw-i3c-master: fix OD timing for first broadcast
  i3c: mipi-i3c-hci: Advertise IBI wakeup capability
  i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev()
  i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI
  i3c: master: Reject IBI requests from non-IBI-capable devices
  i3c: master: Add helper to query bus wakeup requirements
  i3c: master: Report wakeup events for IBIs
  i3c: master: Support IBI-based wakeup capability
  i3c: master: Fix potential UAF in i3c_device_match()
  i3c: master: Fix potential UAF in i3c_device_uevent()
  i3c: Make dev->desc locking assumptions explicit
  i3c: master: Fix use-after-free of master->this
  ...

1 files changed, 251 insertions, 0 deletions

diff --git a/drivers/tty/tty_audit.c b/drivers/tty/tty_audit.c
new file mode 100644
index 000000000..d014af6ab
--- /dev/null
+++ b/drivers/tty/tty_audit.c
@@ -0,0 +1,251 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Creating audit events from TTY input.
+ *
+ * Copyright (C) 2007 Red Hat, Inc.  All rights reserved.
+ *
+ * Authors: Miloslav Trmac <mitr@redhat.com>
+ */
+
+#include <linux/audit.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include "tty.h"
+
+#define TTY_AUDIT_BUF_SIZE	4096
+
+struct tty_audit_buf {
+	struct mutex mutex;	/* Protects all data below */
+	dev_t dev;		/* The TTY which the data is from */
+	bool icanon;
+	size_t valid;
+	u8 *data;		/* Allocated size TTY_AUDIT_BUF_SIZE */
+};
+
+static struct tty_audit_buf *tty_audit_buf_ref(void)
+{
+	struct tty_audit_buf *buf;
+
+	buf = current->signal->tty_audit_buf;
+	WARN_ON(buf == ERR_PTR(-ESRCH));
+	return buf;
+}
+
+static struct tty_audit_buf *tty_audit_buf_alloc(void)
+{
+	struct tty_audit_buf *buf;
+
+	buf = kzalloc_obj(*buf);
+	if (!buf)
+		goto err;
+
+	buf->data = kmalloc(TTY_AUDIT_BUF_SIZE, GFP_KERNEL);
+	if (!buf->data)
+		goto err_buf;
+
+	mutex_init(&buf->mutex);
+
+	return buf;
+
+err_buf:
+	kfree(buf);
+err:
+	return NULL;
+}
+
+static void tty_audit_buf_free(struct tty_audit_buf *buf)
+{
+	WARN_ON(buf->valid != 0);
+	kfree(buf->data);
+	kfree(buf);
+}
+
+static void tty_audit_log(const char *description, dev_t dev,
+			  const u8 *data, size_t size)
+{
+	struct audit_buffer *ab;
+	pid_t pid = task_pid_nr(current);
+	uid_t uid = from_kuid(&init_user_ns, task_uid(current));
+	uid_t loginuid = from_kuid(&init_user_ns, audit_get_loginuid(current));
+	unsigned int sessionid = audit_get_sessionid(current);
+	char name[TASK_COMM_LEN];
+
+	ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_TTY);
+	if (!ab)
+		return;
+
+	audit_log_format(ab, "%s pid=%u uid=%u auid=%u ses=%u major=%d minor=%d comm=",
+			 description, pid, uid, loginuid, sessionid,
+			 MAJOR(dev), MINOR(dev));
+	get_task_comm(name, current);
+	audit_log_untrustedstring(ab, name);
+	audit_log_format(ab, " data=");
+	audit_log_n_hex(ab, data, size);
+	audit_log_end(ab);
+}
+
+/*
+ *	tty_audit_buf_push	-	Push buffered data out
+ *
+ *	Generate an audit message from the contents of @buf, which is owned by
+ *	the current task.  @buf->mutex must be locked.
+ */
+static void tty_audit_buf_push(struct tty_audit_buf *buf)
+{
+	if (buf->valid == 0)
+		return;
+	if (audit_enabled == AUDIT_OFF) {
+		buf->valid = 0;
+		return;
+	}
+	tty_audit_log("tty", buf->dev, buf->data, buf->valid);
+	buf->valid = 0;
+}
+
+/**
+ *	tty_audit_exit	-	Handle a task exit
+ *
+ *	Make sure all buffered data is written out and deallocate the buffer.
+ *	Only needs to be called if current->signal->tty_audit_buf != %NULL.
+ *
+ *	The process is single-threaded at this point; no other threads share
+ *	current->signal.
+ */
+void tty_audit_exit(void)
+{
+	struct tty_audit_buf *buf;
+
+	buf = xchg(&current->signal->tty_audit_buf, ERR_PTR(-ESRCH));
+	if (!buf)
+		return;
+
+	tty_audit_buf_push(buf);
+	tty_audit_buf_free(buf);
+}
+
+/*
+ *	tty_audit_fork	-	Copy TTY audit state for a new task
+ *
+ *	Set up TTY audit state in @sig from current.  @sig needs no locking.
+ */
+void tty_audit_fork(struct signal_struct *sig)
+{
+	sig->audit_tty = current->signal->audit_tty;
+}
+
+/*
+ *	tty_audit_tiocsti	-	Log TIOCSTI
+ */
+void tty_audit_tiocsti(const struct tty_struct *tty, u8 ch)
+{
+	dev_t dev;
+
+	dev = MKDEV(tty->driver->major, tty->driver->minor_start) + tty->index;
+	if (tty_audit_push())
+		return;
+
+	if (audit_enabled)
+		tty_audit_log("ioctl=TIOCSTI", dev, &ch, 1);
+}
+
+/*
+ *	tty_audit_push	-	Flush current's pending audit data
+ *
+ *	Returns 0 if success, -EPERM if tty audit is disabled
+ */
+int tty_audit_push(void)
+{
+	struct tty_audit_buf *buf;
+
+	if (~current->signal->audit_tty & AUDIT_TTY_ENABLE)
+		return -EPERM;
+
+	buf = tty_audit_buf_ref();
+	if (!IS_ERR_OR_NULL(buf)) {
+		mutex_lock(&buf->mutex);
+		tty_audit_buf_push(buf);
+		mutex_unlock(&buf->mutex);
+	}
+	return 0;
+}
+
+/*
+ *	tty_audit_buf_get	-	Get an audit buffer.
+ *
+ *	Get an audit buffer, allocate it if necessary.  Return %NULL
+ *	if out of memory or ERR_PTR(-ESRCH) if tty_audit_exit() has already
+ *	occurred.  Otherwise, return a new reference to the buffer.
+ */
+static struct tty_audit_buf *tty_audit_buf_get(void)
+{
+	struct tty_audit_buf *buf;
+
+	buf = tty_audit_buf_ref();
+	if (buf)
+		return buf;
+
+	buf = tty_audit_buf_alloc();
+	if (buf == NULL) {
+		audit_log_lost("out of memory in TTY auditing");
+		return NULL;
+	}
+
+	/* Race to use this buffer, free it if another wins */
+	if (cmpxchg(&current->signal->tty_audit_buf, NULL, buf) != NULL)
+		tty_audit_buf_free(buf);
+	return tty_audit_buf_ref();
+}
+
+/*
+ *	tty_audit_add_data	-	Add data for TTY auditing.
+ *
+ *	Audit @data of @size from @tty, if necessary.
+ */
+void tty_audit_add_data(const struct tty_struct *tty, const void *data,
+			size_t size)
+{
+	struct tty_audit_buf *buf;
+	unsigned int audit_tty;
+	bool icanon = L_ICANON(tty);
+	dev_t dev;
+
+	audit_tty = READ_ONCE(current->signal->audit_tty);
+	if (~audit_tty & AUDIT_TTY_ENABLE)
+		return;
+
+	if (unlikely(size == 0))
+		return;
+
+	if (tty->driver->type == TTY_DRIVER_TYPE_PTY
+	    && tty->driver->subtype == PTY_TYPE_MASTER)
+		return;
+
+	if ((~audit_tty & AUDIT_TTY_LOG_PASSWD) && icanon && !L_ECHO(tty))
+		return;
+
+	buf = tty_audit_buf_get();
+	if (IS_ERR_OR_NULL(buf))
+		return;
+
+	mutex_lock(&buf->mutex);
+	dev = MKDEV(tty->driver->major, tty->driver->minor_start) + tty->index;
+	if (buf->dev != dev || buf->icanon != icanon) {
+		tty_audit_buf_push(buf);
+		buf->dev = dev;
+		buf->icanon = icanon;
+	}
+	do {
+		size_t run;
+
+		run = TTY_AUDIT_BUF_SIZE - buf->valid;
+		if (run > size)
+			run = size;
+		memcpy(buf->data + buf->valid, data, run);
+		buf->valid += run;
+		data += run;
+		size -= run;
+		if (buf->valid == TTY_AUDIT_BUF_SIZE)
+			tty_audit_buf_push(buf);
+	} while (size != 0);
+	mutex_unlock(&buf->mutex);
+}