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, 263 insertions, 0 deletions

diff --git a/fs/ecryptfs/read_write.c b/fs/ecryptfs/read_write.c
new file mode 100644
index 000000000..b3b451c2b
--- /dev/null
+++ b/fs/ecryptfs/read_write.c
@@ -0,0 +1,263 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * eCryptfs: Linux filesystem encryption layer
+ *
+ * Copyright (C) 2007 International Business Machines Corp.
+ *   Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
+ */
+
+#include <linux/fs.h>
+#include <linux/pagemap.h>
+#include <linux/sched/signal.h>
+
+#include "ecryptfs_kernel.h"
+
+/**
+ * ecryptfs_write_lower
+ * @ecryptfs_inode: The eCryptfs inode
+ * @data: Data to write
+ * @offset: Byte offset in the lower file to which to write the data
+ * @size: Number of bytes from @data to write at @offset in the lower
+ *        file
+ *
+ * Write data to the lower file.
+ *
+ * Returns bytes written on success; less than zero on error
+ */
+int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data,
+			 loff_t offset, size_t size)
+{
+	struct file *lower_file;
+	ssize_t rc;
+
+	lower_file = ecryptfs_inode_to_private(ecryptfs_inode)->lower_file;
+	if (!lower_file)
+		return -EIO;
+	rc = kernel_write(lower_file, data, size, &offset);
+	mark_inode_dirty_sync(ecryptfs_inode);
+	return rc;
+}
+
+/**
+ * ecryptfs_write_lower_page_segment
+ * @ecryptfs_inode: The eCryptfs inode
+ * @folio_for_lower: The folio containing the data to be written to the
+ *                  lower file
+ * @offset_in_page: The offset in the @folio_for_lower from which to
+ *                  start writing the data
+ * @size: The amount of data from @folio_for_lower to write to the
+ *        lower file
+ *
+ * Determines the byte offset in the file for the given page and
+ * offset within the page, maps the page, and makes the call to write
+ * the contents of @folio_for_lower to the lower inode.
+ *
+ * Returns zero on success; non-zero otherwise
+ */
+int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode,
+				      struct folio *folio_for_lower,
+				      size_t offset_in_page, size_t size)
+{
+	char *virt;
+	loff_t offset;
+	int rc;
+
+	offset = (loff_t)folio_for_lower->index * PAGE_SIZE + offset_in_page;
+	virt = kmap_local_folio(folio_for_lower, 0);
+	rc = ecryptfs_write_lower(ecryptfs_inode, virt, offset, size);
+	if (rc > 0)
+		rc = 0;
+	kunmap_local(virt);
+	return rc;
+}
+
+/**
+ * ecryptfs_write
+ * @ecryptfs_inode: The eCryptfs file into which to write
+ * @data: Virtual address where data to write is located
+ * @offset: Offset in the eCryptfs file at which to begin writing the
+ *          data from @data
+ * @size: The number of bytes to write from @data
+ *
+ * Write an arbitrary amount of data to an arbitrary location in the
+ * eCryptfs inode page cache. This is done on a page-by-page, and then
+ * by an extent-by-extent, basis; individual extents are encrypted and
+ * written to the lower page cache (via VFS writes). This function
+ * takes care of all the address translation to locations in the lower
+ * filesystem; it also handles truncate events, writing out zeros
+ * where necessary.
+ *
+ * Returns zero on success; non-zero otherwise
+ */
+int ecryptfs_write(struct inode *ecryptfs_inode, char *data, loff_t offset,
+		   size_t size)
+{
+	struct ecryptfs_crypt_stat *crypt_stat;
+	char *ecryptfs_page_virt;
+	loff_t ecryptfs_file_size = i_size_read(ecryptfs_inode);
+	loff_t data_offset = 0;
+	loff_t pos;
+	int rc = 0;
+
+	crypt_stat = &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
+	/*
+	 * if we are writing beyond current size, then start pos
+	 * at the current size - we'll fill in zeros from there.
+	 */
+	if (offset > ecryptfs_file_size)
+		pos = ecryptfs_file_size;
+	else
+		pos = offset;
+	while (pos < (offset + size)) {
+		struct folio *ecryptfs_folio;
+		pgoff_t ecryptfs_page_idx = (pos >> PAGE_SHIFT);
+		size_t start_offset_in_page = (pos & ~PAGE_MASK);
+		size_t num_bytes = (PAGE_SIZE - start_offset_in_page);
+		loff_t total_remaining_bytes = ((offset + size) - pos);
+
+		if (fatal_signal_pending(current)) {
+			rc = -EINTR;
+			break;
+		}
+
+		if (num_bytes > total_remaining_bytes)
+			num_bytes = total_remaining_bytes;
+		if (pos < offset) {
+			/* remaining zeros to write, up to destination offset */
+			loff_t total_remaining_zeros = (offset - pos);
+
+			if (num_bytes > total_remaining_zeros)
+				num_bytes = total_remaining_zeros;
+		}
+		ecryptfs_folio = read_mapping_folio(ecryptfs_inode->i_mapping,
+				ecryptfs_page_idx, NULL);
+		if (IS_ERR(ecryptfs_folio)) {
+			rc = PTR_ERR(ecryptfs_folio);
+			printk(KERN_ERR "%s: Error getting page at "
+			       "index [%ld] from eCryptfs inode "
+			       "mapping; rc = [%d]\n", __func__,
+			       ecryptfs_page_idx, rc);
+			goto out;
+		}
+		folio_lock(ecryptfs_folio);
+		ecryptfs_page_virt = kmap_local_folio(ecryptfs_folio, 0);
+
+		/*
+		 * pos: where we're now writing, offset: where the request was
+		 * If current pos is before request, we are filling zeros
+		 * If we are at or beyond request, we are writing the *data*
+		 * If we're in a fresh page beyond eof, zero it in either case
+		 */
+		if (pos < offset || !start_offset_in_page) {
+			/* We are extending past the previous end of the file.
+			 * Fill in zero values to the end of the page */
+			memset(((char *)ecryptfs_page_virt
+				+ start_offset_in_page), 0,
+				PAGE_SIZE - start_offset_in_page);
+		}
+
+		/* pos >= offset, we are now writing the data request */
+		if (pos >= offset) {
+			memcpy(((char *)ecryptfs_page_virt
+				+ start_offset_in_page),
+			       (data + data_offset), num_bytes);
+			data_offset += num_bytes;
+		}
+		kunmap_local(ecryptfs_page_virt);
+		flush_dcache_folio(ecryptfs_folio);
+		folio_mark_uptodate(ecryptfs_folio);
+		folio_unlock(ecryptfs_folio);
+		if (crypt_stat->flags & ECRYPTFS_ENCRYPTED)
+			rc = ecryptfs_encrypt_page(ecryptfs_folio);
+		else
+			rc = ecryptfs_write_lower_page_segment(ecryptfs_inode,
+						ecryptfs_folio,
+						start_offset_in_page,
+						data_offset);
+		folio_put(ecryptfs_folio);
+		if (rc) {
+			printk(KERN_ERR "%s: Error encrypting "
+			       "page; rc = [%d]\n", __func__, rc);
+			goto out;
+		}
+		pos += num_bytes;
+	}
+	if (pos > ecryptfs_file_size) {
+		i_size_write(ecryptfs_inode, pos);
+		if (crypt_stat->flags & ECRYPTFS_ENCRYPTED) {
+			int rc2;
+
+			rc2 = ecryptfs_write_inode_size_to_metadata(
+								ecryptfs_inode);
+			if (rc2) {
+				printk(KERN_ERR	"Problem with "
+				       "ecryptfs_write_inode_size_to_metadata; "
+				       "rc = [%d]\n", rc2);
+				if (!rc)
+					rc = rc2;
+				goto out;
+			}
+		}
+	}
+out:
+	return rc;
+}
+
+/**
+ * ecryptfs_read_lower
+ * @data: The read data is stored here by this function
+ * @offset: Byte offset in the lower file from which to read the data
+ * @size: Number of bytes to read from @offset of the lower file and
+ *        store into @data
+ * @ecryptfs_inode: The eCryptfs inode
+ *
+ * Read @size bytes of data at byte offset @offset from the lower
+ * inode into memory location @data.
+ *
+ * Returns bytes read on success; 0 on EOF; less than zero on error
+ */
+int ecryptfs_read_lower(char *data, loff_t offset, size_t size,
+			struct inode *ecryptfs_inode)
+{
+	struct file *lower_file;
+	lower_file = ecryptfs_inode_to_private(ecryptfs_inode)->lower_file;
+	if (!lower_file)
+		return -EIO;
+	return kernel_read(lower_file, data, size, &offset);
+}
+
+/**
+ * ecryptfs_read_lower_page_segment
+ * @folio_for_ecryptfs: The folio into which data for eCryptfs will be
+ *                     written
+ * @page_index: Page index in @page_for_ecryptfs from which to start
+ *		writing
+ * @offset_in_page: Offset in @page_for_ecryptfs from which to start
+ *                  writing
+ * @size: The number of bytes to write into @page_for_ecryptfs
+ * @ecryptfs_inode: The eCryptfs inode
+ *
+ * Determines the byte offset in the file for the given page and
+ * offset within the page, maps the page, and makes the call to read
+ * the contents of @page_for_ecryptfs from the lower inode.
+ *
+ * Returns zero on success; non-zero otherwise
+ */
+int ecryptfs_read_lower_page_segment(struct folio *folio_for_ecryptfs,
+				     pgoff_t page_index,
+				     size_t offset_in_page, size_t size,
+				     struct inode *ecryptfs_inode)
+{
+	char *virt;
+	loff_t offset;
+	int rc;
+
+	offset = (loff_t)page_index * PAGE_SIZE + offset_in_page;
+	virt = kmap_local_folio(folio_for_ecryptfs, 0);
+	rc = ecryptfs_read_lower(virt, offset, size, ecryptfs_inode);
+	if (rc > 0)
+		rc = 0;
+	kunmap_local(virt);
+	flush_dcache_folio(folio_for_ecryptfs);
+	return rc;
+}