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fs/ecryptfs/mmap.c
16 KB
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/** * eCryptfs: Linux filesystem encryption layer * This is where eCryptfs coordinates the symmetric encryption and * decryption of the file data as it passes between the lower * encrypted file and the upper decrypted file. * * Copyright (C) 1997-2003 Erez Zadok * Copyright (C) 2001-2003 Stony Brook University |
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* Copyright (C) 2004-2007 International Business Machines Corp. |
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* Author(s): Michael A. Halcrow <mahalcro@us.ibm.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA * 02111-1307, USA. */ #include <linux/pagemap.h> #include <linux/writeback.h> #include <linux/page-flags.h> #include <linux/mount.h> #include <linux/file.h> #include <linux/crypto.h> #include <linux/scatterlist.h> |
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#include <linux/slab.h> |
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#include <asm/unaligned.h> |
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#include "ecryptfs_kernel.h" |
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/** |
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* ecryptfs_get_locked_page |
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* * Get one page from cache or lower f/s, return error otherwise. * |
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* Returns locked and up-to-date page (if ok), with increased |
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* refcnt. */ |
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struct page *ecryptfs_get_locked_page(struct inode *inode, loff_t index) |
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{ |
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struct page *page = read_mapping_page(inode->i_mapping, index, NULL); |
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if (!IS_ERR(page)) lock_page(page); return page; |
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} |
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/** |
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* ecryptfs_writepage * @page: Page that is locked before this call is made * * Returns zero on success; non-zero otherwise */ static int ecryptfs_writepage(struct page *page, struct writeback_control *wbc) { |
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int rc; |
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rc = ecryptfs_encrypt_page(page); |
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if (rc) { ecryptfs_printk(KERN_WARNING, "Error encrypting " "page (upper index [0x%.16x]) ", page->index); ClearPageUptodate(page); goto out; } SetPageUptodate(page); unlock_page(page); out: return rc; } |
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static void strip_xattr_flag(char *page_virt, struct ecryptfs_crypt_stat *crypt_stat) { if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) { size_t written; crypt_stat->flags &= ~ECRYPTFS_METADATA_IN_XATTR; ecryptfs_write_crypt_stat_flags(page_virt, crypt_stat, &written); crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; } } |
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/** |
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* Header Extent: * Octets 0-7: Unencrypted file size (big-endian) * Octets 8-15: eCryptfs special marker * Octets 16-19: Flags * Octet 16: File format version number (between 0 and 255) * Octets 17-18: Reserved * Octet 19: Bit 1 (lsb): Reserved * Bit 2: Encrypted? * Bits 3-8: Reserved * Octets 20-23: Header extent size (big-endian) * Octets 24-25: Number of header extents at front of file * (big-endian) * Octet 26: Begin RFC 2440 authentication token packet set */ |
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/** |
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* ecryptfs_copy_up_encrypted_with_header * @page: Sort of a ``virtual'' representation of the encrypted lower * file. The actual lower file does not have the metadata in * the header. This is locked. * @crypt_stat: The eCryptfs inode's cryptographic context * * The ``view'' is the version of the file that userspace winds up * seeing, with the header information inserted. */ static int ecryptfs_copy_up_encrypted_with_header(struct page *page, struct ecryptfs_crypt_stat *crypt_stat) { loff_t extent_num_in_page = 0; loff_t num_extents_per_page = (PAGE_CACHE_SIZE / crypt_stat->extent_size); int rc = 0; while (extent_num_in_page < num_extents_per_page) { |
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loff_t view_extent_num = ((((loff_t)page->index) * num_extents_per_page) |
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+ extent_num_in_page); |
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size_t num_header_extents_at_front = |
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(crypt_stat->metadata_size / crypt_stat->extent_size); |
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|
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if (view_extent_num < num_header_extents_at_front) { |
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/* This is a header extent */ char *page_virt; page_virt = kmap_atomic(page, KM_USER0); memset(page_virt, 0, PAGE_CACHE_SIZE); /* TODO: Support more than one header extent */ if (view_extent_num == 0) { |
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size_t written; |
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rc = ecryptfs_read_xattr_region( page_virt, page->mapping->host); |
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strip_xattr_flag(page_virt + 16, crypt_stat); |
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ecryptfs_write_header_metadata(page_virt + 20, crypt_stat, &written); |
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} kunmap_atomic(page_virt, KM_USER0); flush_dcache_page(page); if (rc) { |
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printk(KERN_ERR "%s: Error reading xattr " |
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"region; rc = [%d] ", __func__, rc); |
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goto out; } |
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} else { /* This is an encrypted data extent */ loff_t lower_offset = |
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((view_extent_num * crypt_stat->extent_size) |
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- crypt_stat->metadata_size); |
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rc = ecryptfs_read_lower_page_segment( page, (lower_offset >> PAGE_CACHE_SHIFT), (lower_offset & ~PAGE_CACHE_MASK), crypt_stat->extent_size, page->mapping->host); if (rc) { printk(KERN_ERR "%s: Error attempting to read " "extent at offset [%lld] in the lower " |
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"file; rc = [%d] ", __func__, |
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lower_offset, rc); goto out; } } extent_num_in_page++; } out: return rc; } /** |
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* ecryptfs_readpage |
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* @file: An eCryptfs file * @page: Page from eCryptfs inode mapping into which to stick the read data |
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* * Read in a page, decrypting if necessary. * * Returns zero on success; non-zero on error. */ static int ecryptfs_readpage(struct file *file, struct page *page) { |
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struct ecryptfs_crypt_stat *crypt_stat = |
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&ecryptfs_inode_to_private(page->mapping->host)->crypt_stat; |
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int rc = 0; |
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|
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if (!crypt_stat |
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|| !(crypt_stat->flags & ECRYPTFS_ENCRYPTED) || (crypt_stat->flags & ECRYPTFS_NEW_FILE)) { |
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ecryptfs_printk(KERN_DEBUG, "Passing through unencrypted page "); |
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rc = ecryptfs_read_lower_page_segment(page, page->index, 0, PAGE_CACHE_SIZE, page->mapping->host); |
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} else if (crypt_stat->flags & ECRYPTFS_VIEW_AS_ENCRYPTED) { if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) { |
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rc = ecryptfs_copy_up_encrypted_with_header(page, crypt_stat); if (rc) { printk(KERN_ERR "%s: Error attempting to copy " "the encrypted content from the lower " "file whilst inserting the metadata " "from the xattr into the header; rc = " |
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"[%d] ", __func__, rc); |
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goto out; |
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} |
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|
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} else { |
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rc = ecryptfs_read_lower_page_segment( page, page->index, 0, PAGE_CACHE_SIZE, page->mapping->host); |
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if (rc) { printk(KERN_ERR "Error reading page; rc = " "[%d] ", rc); goto out; } } |
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} else { |
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rc = ecryptfs_decrypt_page(page); |
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if (rc) { |
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ecryptfs_printk(KERN_ERR, "Error decrypting page; " "rc = [%d] ", rc); goto out; } } |
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out: |
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if (rc) ClearPageUptodate(page); else SetPageUptodate(page); |
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ecryptfs_printk(KERN_DEBUG, "Unlocking page with index = [0x%.16x] ", page->index); unlock_page(page); return rc; } |
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/** * Called with lower inode mutex held. */ |
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static int fill_zeros_to_end_of_page(struct page *page, unsigned int to) { struct inode *inode = page->mapping->host; int end_byte_in_page; |
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|
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if ((i_size_read(inode) / PAGE_CACHE_SIZE) != page->index) goto out; end_byte_in_page = i_size_read(inode) % PAGE_CACHE_SIZE; if (to > end_byte_in_page) end_byte_in_page = to; |
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zero_user_segment(page, end_byte_in_page, PAGE_CACHE_SIZE); |
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out: |
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return 0; |
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} |
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/** |
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* ecryptfs_write_begin |
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* @file: The eCryptfs file |
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* @mapping: The eCryptfs object * @pos: The file offset at which to start writing * @len: Length of the write * @flags: Various flags * @pagep: Pointer to return the page * @fsdata: Pointer to return fs data (unused) |
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* * This function must zero any hole we create * * Returns zero on success; non-zero otherwise */ |
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static int ecryptfs_write_begin(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata) |
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{ |
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pgoff_t index = pos >> PAGE_CACHE_SHIFT; struct page *page; |
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loff_t prev_page_end_size; |
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int rc = 0; |
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|
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page = grab_cache_page_write_begin(mapping, index, flags); |
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if (!page) return -ENOMEM; *pagep = page; |
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if (!PageUptodate(page)) { |
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struct ecryptfs_crypt_stat *crypt_stat = |
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&ecryptfs_inode_to_private(mapping->host)->crypt_stat; |
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if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED) || (crypt_stat->flags & ECRYPTFS_NEW_FILE)) { rc = ecryptfs_read_lower_page_segment( |
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page, index, 0, PAGE_CACHE_SIZE, mapping->host); |
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if (rc) { printk(KERN_ERR "%s: Error attemping to read " "lower page segment; rc = [%d] ", |
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__func__, rc); |
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ClearPageUptodate(page); goto out; } else SetPageUptodate(page); } else if (crypt_stat->flags & ECRYPTFS_VIEW_AS_ENCRYPTED) { if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) { rc = ecryptfs_copy_up_encrypted_with_header( page, crypt_stat); if (rc) { printk(KERN_ERR "%s: Error attempting " "to copy the encrypted content " "from the lower file whilst " "inserting the metadata from " "the xattr into the header; rc " |
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"= [%d] ", __func__, rc); |
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ClearPageUptodate(page); goto out; } SetPageUptodate(page); } else { rc = ecryptfs_read_lower_page_segment( |
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page, index, 0, PAGE_CACHE_SIZE, mapping->host); |
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if (rc) { printk(KERN_ERR "%s: Error reading " "page; rc = [%d] ", |
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__func__, rc); |
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ClearPageUptodate(page); goto out; } SetPageUptodate(page); } } else { rc = ecryptfs_decrypt_page(page); if (rc) { printk(KERN_ERR "%s: Error decrypting page " "at index [%ld]; rc = [%d] ", |
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__func__, page->index, rc); |
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ClearPageUptodate(page); goto out; } |
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SetPageUptodate(page); |
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} |
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} |
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prev_page_end_size = ((loff_t)index << PAGE_CACHE_SHIFT); |
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/* If creating a page or more of holes, zero them out via truncate. * Note, this will increase i_size. */ |
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if (index != 0) { |
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if (prev_page_end_size > i_size_read(page->mapping->host)) { |
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rc = ecryptfs_truncate(file->f_path.dentry, |
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prev_page_end_size); |
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if (rc) { |
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printk(KERN_ERR "%s: Error on attempt to " |
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"truncate to (higher) offset [%lld];" |
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" rc = [%d] ", __func__, |
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prev_page_end_size, rc); |
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goto out; } |
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} |
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} |
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/* Writing to a new page, and creating a small hole from start * of page? Zero it out. */ |
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if ((i_size_read(mapping->host) == prev_page_end_size) && (pos != 0)) |
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zero_user(page, 0, PAGE_CACHE_SIZE); |
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out: return rc; } |
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/** * ecryptfs_write_inode_size_to_header * * Writes the lower file size to the first 8 bytes of the header. * * Returns zero on success; non-zero on error. */ |
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static int ecryptfs_write_inode_size_to_header(struct inode *ecryptfs_inode) |
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{ |
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char *file_size_virt; int rc; |
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file_size_virt = kmalloc(sizeof(u64), GFP_KERNEL); if (!file_size_virt) { rc = -ENOMEM; |
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goto out; } |
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put_unaligned_be64(i_size_read(ecryptfs_inode), file_size_virt); |
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rc = ecryptfs_write_lower(ecryptfs_inode, file_size_virt, 0, sizeof(u64)); kfree(file_size_virt); |
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if (rc < 0) |
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printk(KERN_ERR "%s: Error writing file size to header; " |
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"rc = [%d] ", __func__, rc); |
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else rc = 0; |
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out: return rc; } |
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struct kmem_cache *ecryptfs_xattr_cache; static int ecryptfs_write_inode_size_to_xattr(struct inode *ecryptfs_inode) |
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{ ssize_t size; void *xattr_virt; |
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struct dentry *lower_dentry = ecryptfs_inode_to_private(ecryptfs_inode)->lower_file->f_dentry; struct inode *lower_inode = lower_dentry->d_inode; |
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int rc; |
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if (!lower_inode->i_op->getxattr || !lower_inode->i_op->setxattr) { printk(KERN_WARNING "No support for setting xattr in lower filesystem "); rc = -ENOSYS; goto out; } |
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xattr_virt = kmem_cache_alloc(ecryptfs_xattr_cache, GFP_KERNEL); if (!xattr_virt) { printk(KERN_ERR "Out of memory whilst attempting to write " "inode size to xattr "); rc = -ENOMEM; goto out; } |
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mutex_lock(&lower_inode->i_mutex); size = lower_inode->i_op->getxattr(lower_dentry, ECRYPTFS_XATTR_NAME, xattr_virt, PAGE_CACHE_SIZE); |
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if (size < 0) size = 8; |
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put_unaligned_be64(i_size_read(ecryptfs_inode), xattr_virt); |
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rc = lower_inode->i_op->setxattr(lower_dentry, ECRYPTFS_XATTR_NAME, xattr_virt, size, 0); mutex_unlock(&lower_inode->i_mutex); |
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if (rc) printk(KERN_ERR "Error whilst attempting to write inode size " "to lower file xattr; rc = [%d] ", rc); kmem_cache_free(ecryptfs_xattr_cache, xattr_virt); out: return rc; } |
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int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode) |
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{ struct ecryptfs_crypt_stat *crypt_stat; |
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crypt_stat = &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; |
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BUG_ON(!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)); |
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if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) |
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return ecryptfs_write_inode_size_to_xattr(ecryptfs_inode); |
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else |
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return ecryptfs_write_inode_size_to_header(ecryptfs_inode); |
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} |
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/** |
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* ecryptfs_write_end |
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* @file: The eCryptfs file object |
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* @mapping: The eCryptfs object * @pos: The file position * @len: The length of the data (unused) * @copied: The amount of data copied |
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* @page: The eCryptfs page |
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* @fsdata: The fsdata (unused) |
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* * This is where we encrypt the data and pass the encrypted data to * the lower filesystem. In OpenPGP-compatible mode, we operate on * entire underlying packets. */ |
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static int ecryptfs_write_end(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata) |
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{ |
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pgoff_t index = pos >> PAGE_CACHE_SHIFT; unsigned from = pos & (PAGE_CACHE_SIZE - 1); unsigned to = from + copied; struct inode *ecryptfs_inode = mapping->host; |
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struct ecryptfs_crypt_stat *crypt_stat = |
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&ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; |
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int rc; |
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if (crypt_stat->flags & ECRYPTFS_NEW_FILE) { |
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ecryptfs_printk(KERN_DEBUG, "ECRYPTFS_NEW_FILE flag set in " "crypt_stat at memory location [%p] ", crypt_stat); |
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crypt_stat->flags &= ~(ECRYPTFS_NEW_FILE); |
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} else ecryptfs_printk(KERN_DEBUG, "Not a new file "); ecryptfs_printk(KERN_DEBUG, "Calling fill_zeros_to_end_of_page" |
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"(page w/ index = [0x%.16x], to = [%d]) ", index, to); |
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if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { rc = ecryptfs_write_lower_page_segment(ecryptfs_inode, page, 0, to); if (!rc) { rc = copied; fsstack_copy_inode_size(ecryptfs_inode, ecryptfs_inode_to_lower(ecryptfs_inode)); } goto out; } |
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/* Fills in zeros if 'to' goes beyond inode size */ |
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rc = fill_zeros_to_end_of_page(page, to); if (rc) { ecryptfs_printk(KERN_WARNING, "Error attempting to fill " |
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"zeros in page with index = [0x%.16x] ", index); |
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goto out; } |
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|
514 |
rc = ecryptfs_encrypt_page(page); |
237fead61
|
515 516 |
if (rc) { ecryptfs_printk(KERN_WARNING, "Error encrypting page (upper " |
807b7ebe4
|
517 518 |
"index [0x%.16x]) ", index); |
237fead61
|
519 520 |
goto out; } |
807b7ebe4
|
521 522 |
if (pos + copied > i_size_read(ecryptfs_inode)) { i_size_write(ecryptfs_inode, pos + copied); |
237fead61
|
523 |
ecryptfs_printk(KERN_DEBUG, "Expanded file size to " |
bf12be1cc
|
524 525 |
"[0x%.16x] ", i_size_read(ecryptfs_inode)); |
237fead61
|
526 |
} |
bf12be1cc
|
527 |
rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode); |
dd2a3b7ad
|
528 529 530 531 |
if (rc) printk(KERN_ERR "Error writing inode size to metadata; " "rc = [%d] ", rc); |
807b7ebe4
|
532 533 |
else rc = copied; |
237fead61
|
534 |
out: |
807b7ebe4
|
535 536 |
unlock_page(page); page_cache_release(page); |
237fead61
|
537 538 |
return rc; } |
237fead61
|
539 540 541 542 543 544 545 546 547 548 549 550 551 |
static sector_t ecryptfs_bmap(struct address_space *mapping, sector_t block) { int rc = 0; struct inode *inode; struct inode *lower_inode; inode = (struct inode *)mapping->host; lower_inode = ecryptfs_inode_to_lower(inode); if (lower_inode->i_mapping->a_ops->bmap) rc = lower_inode->i_mapping->a_ops->bmap(lower_inode->i_mapping, block); return rc; } |
7f09410bb
|
552 |
const struct address_space_operations ecryptfs_aops = { |
237fead61
|
553 554 |
.writepage = ecryptfs_writepage, .readpage = ecryptfs_readpage, |
807b7ebe4
|
555 556 |
.write_begin = ecryptfs_write_begin, .write_end = ecryptfs_write_end, |
237fead61
|
557 |
.bmap = ecryptfs_bmap, |
237fead61
|
558 |
}; |