^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * eCryptfs: Linux filesystem encryption layer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * This is where eCryptfs coordinates the symmetric encryption and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * decryption of the file data as it passes between the lower
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * encrypted file and the upper decrypted file.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Copyright (C) 1997-2003 Erez Zadok
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Copyright (C) 2001-2003 Stony Brook University
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Copyright (C) 2004-2007 International Business Machines Corp.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/writeback.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/page-flags.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/mount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/scatterlist.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/xattr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <asm/unaligned.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include "ecryptfs_kernel.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * ecryptfs_get_locked_page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * Get one page from cache or lower f/s, return error otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * Returns locked and up-to-date page (if ok), with increased
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * refcnt.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct page *ecryptfs_get_locked_page(struct inode *inode, loff_t index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct page *page = read_mapping_page(inode->i_mapping, index, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) if (!IS_ERR(page))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) lock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) return page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * ecryptfs_writepage
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * @page: Page that is locked before this call is made
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * Returns zero on success; non-zero otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * This is where we encrypt the data and pass the encrypted data to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * the lower filesystem. In OpenPGP-compatible mode, we operate on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * entire underlying packets.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) static int ecryptfs_writepage(struct page *page, struct writeback_control *wbc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) rc = ecryptfs_encrypt_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) ecryptfs_printk(KERN_WARNING, "Error encrypting "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) "page (upper index [0x%.16lx])\n", page->index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) ClearPageUptodate(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) SetPageUptodate(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) static void strip_xattr_flag(char *page_virt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) struct ecryptfs_crypt_stat *crypt_stat)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) size_t written;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) crypt_stat->flags &= ~ECRYPTFS_METADATA_IN_XATTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) ecryptfs_write_crypt_stat_flags(page_virt, crypt_stat,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) &written);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * Header Extent:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * Octets 0-7: Unencrypted file size (big-endian)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * Octets 8-15: eCryptfs special marker
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) * Octets 16-19: Flags
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) * Octet 16: File format version number (between 0 and 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * Octets 17-18: Reserved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * Octet 19: Bit 1 (lsb): Reserved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * Bit 2: Encrypted?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) * Bits 3-8: Reserved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) * Octets 20-23: Header extent size (big-endian)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) * Octets 24-25: Number of header extents at front of file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * (big-endian)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * Octet 26: Begin RFC 2440 authentication token packet set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) * ecryptfs_copy_up_encrypted_with_header
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) * @page: Sort of a ``virtual'' representation of the encrypted lower
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * file. The actual lower file does not have the metadata in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) * the header. This is locked.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) * @crypt_stat: The eCryptfs inode's cryptographic context
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) * The ``view'' is the version of the file that userspace winds up
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) * seeing, with the header information inserted.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) ecryptfs_copy_up_encrypted_with_header(struct page *page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) struct ecryptfs_crypt_stat *crypt_stat)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) loff_t extent_num_in_page = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) loff_t num_extents_per_page = (PAGE_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) / crypt_stat->extent_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) int rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) while (extent_num_in_page < num_extents_per_page) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) loff_t view_extent_num = ((((loff_t)page->index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) * num_extents_per_page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) + extent_num_in_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) size_t num_header_extents_at_front =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) (crypt_stat->metadata_size / crypt_stat->extent_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) if (view_extent_num < num_header_extents_at_front) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) /* This is a header extent */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) char *page_virt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) page_virt = kmap_atomic(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) memset(page_virt, 0, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) /* TODO: Support more than one header extent */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) if (view_extent_num == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) size_t written;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) rc = ecryptfs_read_xattr_region(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) page_virt, page->mapping->host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) strip_xattr_flag(page_virt + 16, crypt_stat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) ecryptfs_write_header_metadata(page_virt + 20,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) crypt_stat,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) &written);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) kunmap_atomic(page_virt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) flush_dcache_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) printk(KERN_ERR "%s: Error reading xattr "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) "region; rc = [%d]\n", __func__, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) /* This is an encrypted data extent */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) loff_t lower_offset =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) ((view_extent_num * crypt_stat->extent_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) - crypt_stat->metadata_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) rc = ecryptfs_read_lower_page_segment(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) page, (lower_offset >> PAGE_SHIFT),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) (lower_offset & ~PAGE_MASK),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) crypt_stat->extent_size, page->mapping->host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) printk(KERN_ERR "%s: Error attempting to read "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) "extent at offset [%lld] in the lower "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) "file; rc = [%d]\n", __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) lower_offset, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) extent_num_in_page++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) * ecryptfs_readpage
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) * @file: An eCryptfs file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) * @page: Page from eCryptfs inode mapping into which to stick the read data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) * Read in a page, decrypting if necessary.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) * Returns zero on success; non-zero on error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) static int ecryptfs_readpage(struct file *file, struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) struct ecryptfs_crypt_stat *crypt_stat =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) &ecryptfs_inode_to_private(page->mapping->host)->crypt_stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) int rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) if (!crypt_stat || !(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) rc = ecryptfs_read_lower_page_segment(page, page->index, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) PAGE_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) page->mapping->host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) } else if (crypt_stat->flags & ECRYPTFS_VIEW_AS_ENCRYPTED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) rc = ecryptfs_copy_up_encrypted_with_header(page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) crypt_stat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) printk(KERN_ERR "%s: Error attempting to copy "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) "the encrypted content from the lower "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) "file whilst inserting the metadata "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) "from the xattr into the header; rc = "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) "[%d]\n", __func__, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) rc = ecryptfs_read_lower_page_segment(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) page, page->index, 0, PAGE_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) page->mapping->host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) printk(KERN_ERR "Error reading page; rc = "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) "[%d]\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) rc = ecryptfs_decrypt_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) ecryptfs_printk(KERN_ERR, "Error decrypting page; "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) "rc = [%d]\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) ClearPageUptodate(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) SetPageUptodate(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) ecryptfs_printk(KERN_DEBUG, "Unlocking page with index = [0x%.16lx]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) page->index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) * Called with lower inode mutex held.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) static int fill_zeros_to_end_of_page(struct page *page, unsigned int to)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) struct inode *inode = page->mapping->host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) int end_byte_in_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) if ((i_size_read(inode) / PAGE_SIZE) != page->index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) end_byte_in_page = i_size_read(inode) % PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) if (to > end_byte_in_page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) end_byte_in_page = to;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) zero_user_segment(page, end_byte_in_page, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) * ecryptfs_write_begin
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) * @file: The eCryptfs file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) * @mapping: The eCryptfs object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) * @pos: The file offset at which to start writing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) * @len: Length of the write
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) * @flags: Various flags
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) * @pagep: Pointer to return the page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) * @fsdata: Pointer to return fs data (unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) * This function must zero any hole we create
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) * Returns zero on success; non-zero otherwise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) static int ecryptfs_write_begin(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) struct address_space *mapping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) loff_t pos, unsigned len, unsigned flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) struct page **pagep, void **fsdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) pgoff_t index = pos >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) loff_t prev_page_end_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) int rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) page = grab_cache_page_write_begin(mapping, index, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) if (!page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) *pagep = page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) prev_page_end_size = ((loff_t)index << PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) if (!PageUptodate(page)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) struct ecryptfs_crypt_stat *crypt_stat =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) &ecryptfs_inode_to_private(mapping->host)->crypt_stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) rc = ecryptfs_read_lower_page_segment(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) page, index, 0, PAGE_SIZE, mapping->host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) printk(KERN_ERR "%s: Error attempting to read "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) "lower page segment; rc = [%d]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) __func__, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) ClearPageUptodate(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) SetPageUptodate(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) } else if (crypt_stat->flags & ECRYPTFS_VIEW_AS_ENCRYPTED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) rc = ecryptfs_copy_up_encrypted_with_header(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) page, crypt_stat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) printk(KERN_ERR "%s: Error attempting "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) "to copy the encrypted content "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) "from the lower file whilst "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) "inserting the metadata from "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) "the xattr into the header; rc "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) "= [%d]\n", __func__, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) ClearPageUptodate(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) SetPageUptodate(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) rc = ecryptfs_read_lower_page_segment(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) page, index, 0, PAGE_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) mapping->host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) printk(KERN_ERR "%s: Error reading "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) "page; rc = [%d]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) __func__, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) ClearPageUptodate(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) SetPageUptodate(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) if (prev_page_end_size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) >= i_size_read(page->mapping->host)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) zero_user(page, 0, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) SetPageUptodate(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) } else if (len < PAGE_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) rc = ecryptfs_decrypt_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) printk(KERN_ERR "%s: Error decrypting "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) "page at index [%ld]; "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) "rc = [%d]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) __func__, page->index, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) ClearPageUptodate(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) SetPageUptodate(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) /* If creating a page or more of holes, zero them out via truncate.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) * Note, this will increase i_size. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) if (index != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) if (prev_page_end_size > i_size_read(page->mapping->host)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) rc = ecryptfs_truncate(file->f_path.dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) prev_page_end_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) printk(KERN_ERR "%s: Error on attempt to "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) "truncate to (higher) offset [%lld];"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) " rc = [%d]\n", __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) prev_page_end_size, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) /* Writing to a new page, and creating a small hole from start
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) * of page? Zero it out. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) if ((i_size_read(mapping->host) == prev_page_end_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) && (pos != 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) zero_user(page, 0, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) if (unlikely(rc)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) *pagep = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) * ecryptfs_write_inode_size_to_header
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) * Writes the lower file size to the first 8 bytes of the header.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) * Returns zero on success; non-zero on error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) static int ecryptfs_write_inode_size_to_header(struct inode *ecryptfs_inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) char *file_size_virt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) file_size_virt = kmalloc(sizeof(u64), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) if (!file_size_virt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) rc = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) put_unaligned_be64(i_size_read(ecryptfs_inode), file_size_virt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) rc = ecryptfs_write_lower(ecryptfs_inode, file_size_virt, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) sizeof(u64));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) kfree(file_size_virt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) if (rc < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) printk(KERN_ERR "%s: Error writing file size to header; "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) "rc = [%d]\n", __func__, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) struct kmem_cache *ecryptfs_xattr_cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) static int ecryptfs_write_inode_size_to_xattr(struct inode *ecryptfs_inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) ssize_t size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) void *xattr_virt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) struct dentry *lower_dentry =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) ecryptfs_inode_to_private(ecryptfs_inode)->lower_file->f_path.dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) struct inode *lower_inode = d_inode(lower_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) if (!(lower_inode->i_opflags & IOP_XATTR)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) printk(KERN_WARNING
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) "No support for setting xattr in lower filesystem\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) rc = -ENOSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) xattr_virt = kmem_cache_alloc(ecryptfs_xattr_cache, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) if (!xattr_virt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) rc = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) inode_lock(lower_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) size = __vfs_getxattr(lower_dentry, lower_inode, ECRYPTFS_XATTR_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) xattr_virt, PAGE_SIZE, XATTR_NOSECURITY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) if (size < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) size = 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) put_unaligned_be64(i_size_read(ecryptfs_inode), xattr_virt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) rc = __vfs_setxattr(lower_dentry, lower_inode, ECRYPTFS_XATTR_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) xattr_virt, size, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) inode_unlock(lower_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) printk(KERN_ERR "Error whilst attempting to write inode size "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) "to lower file xattr; rc = [%d]\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) kmem_cache_free(ecryptfs_xattr_cache, xattr_virt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) struct ecryptfs_crypt_stat *crypt_stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) crypt_stat = &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) BUG_ON(!(crypt_stat->flags & ECRYPTFS_ENCRYPTED));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) return ecryptfs_write_inode_size_to_xattr(ecryptfs_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) return ecryptfs_write_inode_size_to_header(ecryptfs_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) * ecryptfs_write_end
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) * @file: The eCryptfs file object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) * @mapping: The eCryptfs object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) * @pos: The file position
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) * @len: The length of the data (unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) * @copied: The amount of data copied
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) * @page: The eCryptfs page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) * @fsdata: The fsdata (unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) static int ecryptfs_write_end(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) struct address_space *mapping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) loff_t pos, unsigned len, unsigned copied,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) struct page *page, void *fsdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) pgoff_t index = pos >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) unsigned from = pos & (PAGE_SIZE - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) unsigned to = from + copied;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) struct inode *ecryptfs_inode = mapping->host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) struct ecryptfs_crypt_stat *crypt_stat =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) ecryptfs_printk(KERN_DEBUG, "Calling fill_zeros_to_end_of_page"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) "(page w/ index = [0x%.16lx], to = [%d])\n", index, to);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) rc = ecryptfs_write_lower_page_segment(ecryptfs_inode, page, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) to);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) if (!rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) rc = copied;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) fsstack_copy_inode_size(ecryptfs_inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) ecryptfs_inode_to_lower(ecryptfs_inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) if (!PageUptodate(page)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) if (copied < PAGE_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) SetPageUptodate(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) /* Fills in zeros if 'to' goes beyond inode size */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) rc = fill_zeros_to_end_of_page(page, to);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) ecryptfs_printk(KERN_WARNING, "Error attempting to fill "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) "zeros in page with index = [0x%.16lx]\n", index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) rc = ecryptfs_encrypt_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) ecryptfs_printk(KERN_WARNING, "Error encrypting page (upper "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) "index [0x%.16lx])\n", index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) if (pos + copied > i_size_read(ecryptfs_inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) i_size_write(ecryptfs_inode, pos + copied);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) ecryptfs_printk(KERN_DEBUG, "Expanded file size to "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) "[0x%.16llx]\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) (unsigned long long)i_size_read(ecryptfs_inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) printk(KERN_ERR "Error writing inode size to metadata; "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) "rc = [%d]\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) rc = copied;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) put_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) static sector_t ecryptfs_bmap(struct address_space *mapping, sector_t block)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) struct inode *lower_inode = ecryptfs_inode_to_lower(mapping->host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) int ret = bmap(lower_inode, &block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) return block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) const struct address_space_operations ecryptfs_aops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) .writepage = ecryptfs_writepage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) .readpage = ecryptfs_readpage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) .write_begin = ecryptfs_write_begin,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) .write_end = ecryptfs_write_end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) .bmap = ecryptfs_bmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) };
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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