eCryptfs: replace encrypt, decrypt, and inode size write
Replace page encryption and decryption routines and inode size write routine with versions that utilize the read_write.c functions. Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michael Halcrow
Linus Torvalds
Родитель
da0102a10a
Коммит
0216f7f792
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@ -466,9 +466,92 @@ out:
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return rc;
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}
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/**
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* ecryptfs_lower_offset_for_extent
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*
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* Convert an eCryptfs page index into a lower byte offset
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*/
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void ecryptfs_lower_offset_for_extent(loff_t *offset, loff_t extent_num,
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struct ecryptfs_crypt_stat *crypt_stat)
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{
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(*offset) = ((crypt_stat->extent_size
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* crypt_stat->num_header_extents_at_front)
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+ (crypt_stat->extent_size * extent_num));
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}
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/**
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* ecryptfs_encrypt_extent
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* @enc_extent_page: Allocated page into which to encrypt the data in
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* @page
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* @crypt_stat: crypt_stat containing cryptographic context for the
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* encryption operation
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* @page: Page containing plaintext data extent to encrypt
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* @extent_offset: Page extent offset for use in generating IV
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*
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* Encrypts one extent of data.
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*
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* Return zero on success; non-zero otherwise
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*/
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static int ecryptfs_encrypt_extent(struct page *enc_extent_page,
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struct ecryptfs_crypt_stat *crypt_stat,
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struct page *page,
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unsigned long extent_offset)
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{
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unsigned long extent_base;
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char extent_iv[ECRYPTFS_MAX_IV_BYTES];
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int rc;
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extent_base = (page->index
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* (PAGE_CACHE_SIZE / crypt_stat->extent_size));
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rc = ecryptfs_derive_iv(extent_iv, crypt_stat,
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(extent_base + extent_offset));
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if (rc) {
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ecryptfs_printk(KERN_ERR, "Error attempting to "
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"derive IV for extent [0x%.16x]; "
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"rc = [%d]\n", (extent_base + extent_offset),
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rc);
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goto out;
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}
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if (unlikely(ecryptfs_verbosity > 0)) {
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ecryptfs_printk(KERN_DEBUG, "Encrypting extent "
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"with iv:\n");
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ecryptfs_dump_hex(extent_iv, crypt_stat->iv_bytes);
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ecryptfs_printk(KERN_DEBUG, "First 8 bytes before "
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"encryption:\n");
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ecryptfs_dump_hex((char *)
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(page_address(page)
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+ (extent_offset * crypt_stat->extent_size)),
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8);
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}
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rc = ecryptfs_encrypt_page_offset(crypt_stat, enc_extent_page, 0,
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page, (extent_offset
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* crypt_stat->extent_size),
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crypt_stat->extent_size, extent_iv);
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if (rc < 0) {
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printk(KERN_ERR "%s: Error attempting to encrypt page with "
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"page->index = [%ld], extent_offset = [%ld]; "
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"rc = [%d]\n", __FUNCTION__, page->index, extent_offset,
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rc);
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goto out;
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}
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rc = 0;
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if (unlikely(ecryptfs_verbosity > 0)) {
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ecryptfs_printk(KERN_DEBUG, "Encrypt extent [0x%.16x]; "
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"rc = [%d]\n", (extent_base + extent_offset),
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rc);
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ecryptfs_printk(KERN_DEBUG, "First 8 bytes after "
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"encryption:\n");
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ecryptfs_dump_hex((char *)(page_address(enc_extent_page)), 8);
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}
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out:
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return rc;
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}
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/**
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* ecryptfs_encrypt_page
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* @ctx: The context of the page
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* @page: Page mapped from the eCryptfs inode for the file; contains
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* decrypted content that needs to be encrypted (to a temporary
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* page; not in place) and written out to the lower file
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*
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* Encrypt an eCryptfs page. This is done on a per-extent basis. Note
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* that eCryptfs pages may straddle the lower pages -- for instance,
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@ -478,128 +561,121 @@ out:
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* file, 24K of page 0 of the lower file will be read and decrypted,
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* and then 8K of page 1 of the lower file will be read and decrypted.
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*
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* The actual operations performed on each page depends on the
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* contents of the ecryptfs_page_crypt_context struct.
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*
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* Returns zero on success; negative on error
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*/
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int ecryptfs_encrypt_page(struct ecryptfs_page_crypt_context *ctx)
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int ecryptfs_encrypt_page(struct page *page)
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{
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char extent_iv[ECRYPTFS_MAX_IV_BYTES];
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unsigned long base_extent;
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unsigned long extent_offset = 0;
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unsigned long lower_page_idx = 0;
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unsigned long prior_lower_page_idx = 0;
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struct page *lower_page;
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struct inode *lower_inode;
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struct ecryptfs_inode_info *inode_info;
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struct inode *ecryptfs_inode;
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struct ecryptfs_crypt_stat *crypt_stat;
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char *enc_extent_virt = NULL;
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struct page *enc_extent_page;
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loff_t extent_offset;
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int rc = 0;
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int lower_byte_offset = 0;
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int orig_byte_offset = 0;
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int num_extents_per_page;
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#define ECRYPTFS_PAGE_STATE_UNREAD 0
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#define ECRYPTFS_PAGE_STATE_READ 1
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#define ECRYPTFS_PAGE_STATE_MODIFIED 2
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#define ECRYPTFS_PAGE_STATE_WRITTEN 3
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int page_state;
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lower_inode = ecryptfs_inode_to_lower(ctx->page->mapping->host);
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inode_info = ecryptfs_inode_to_private(ctx->page->mapping->host);
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crypt_stat = &inode_info->crypt_stat;
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ecryptfs_inode = page->mapping->host;
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crypt_stat =
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&(ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat);
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if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
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rc = ecryptfs_copy_page_to_lower(ctx->page, lower_inode,
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ctx->param.lower_file);
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rc = ecryptfs_write_lower_page_segment(ecryptfs_inode, page,
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0, PAGE_CACHE_SIZE);
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if (rc)
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ecryptfs_printk(KERN_ERR, "Error attempting to copy "
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"page at index [0x%.16x]\n",
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ctx->page->index);
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printk(KERN_ERR "%s: Error attempting to copy "
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"page at index [%ld]\n", __FUNCTION__,
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page->index);
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goto out;
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}
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num_extents_per_page = PAGE_CACHE_SIZE / crypt_stat->extent_size;
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base_extent = (ctx->page->index * num_extents_per_page);
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page_state = ECRYPTFS_PAGE_STATE_UNREAD;
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while (extent_offset < num_extents_per_page) {
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ecryptfs_extent_to_lwr_pg_idx_and_offset(
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&lower_page_idx, &lower_byte_offset, crypt_stat,
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(base_extent + extent_offset));
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if (prior_lower_page_idx != lower_page_idx
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&& page_state == ECRYPTFS_PAGE_STATE_MODIFIED) {
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rc = ecryptfs_write_out_page(ctx, lower_page,
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lower_inode,
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orig_byte_offset,
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(PAGE_CACHE_SIZE
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- orig_byte_offset));
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if (rc) {
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ecryptfs_printk(KERN_ERR, "Error attempting "
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"to write out page; rc = [%d]"
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"\n", rc);
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goto out;
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}
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page_state = ECRYPTFS_PAGE_STATE_WRITTEN;
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}
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if (page_state == ECRYPTFS_PAGE_STATE_UNREAD
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|| page_state == ECRYPTFS_PAGE_STATE_WRITTEN) {
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rc = ecryptfs_read_in_page(ctx, &lower_page,
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lower_inode, lower_page_idx,
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lower_byte_offset);
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if (rc) {
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ecryptfs_printk(KERN_ERR, "Error attempting "
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"to read in lower page with "
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"index [0x%.16x]; rc = [%d]\n",
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lower_page_idx, rc);
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goto out;
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}
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orig_byte_offset = lower_byte_offset;
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prior_lower_page_idx = lower_page_idx;
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page_state = ECRYPTFS_PAGE_STATE_READ;
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}
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BUG_ON(!(page_state == ECRYPTFS_PAGE_STATE_MODIFIED
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|| page_state == ECRYPTFS_PAGE_STATE_READ));
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rc = ecryptfs_derive_iv(extent_iv, crypt_stat,
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(base_extent + extent_offset));
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enc_extent_virt = kmalloc(PAGE_CACHE_SIZE, GFP_USER);
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if (!enc_extent_virt) {
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rc = -ENOMEM;
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ecryptfs_printk(KERN_ERR, "Error allocating memory for "
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"encrypted extent\n");
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goto out;
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}
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enc_extent_page = virt_to_page(enc_extent_virt);
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for (extent_offset = 0;
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extent_offset < (PAGE_CACHE_SIZE / crypt_stat->extent_size);
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extent_offset++) {
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loff_t offset;
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rc = ecryptfs_encrypt_extent(enc_extent_page, crypt_stat, page,
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extent_offset);
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if (rc) {
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ecryptfs_printk(KERN_ERR, "Error attempting to "
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"derive IV for extent [0x%.16x]; "
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"rc = [%d]\n",
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(base_extent + extent_offset), rc);
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printk(KERN_ERR "%s: Error encrypting extent; "
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"rc = [%d]\n", __FUNCTION__, rc);
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goto out;
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}
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if (unlikely(ecryptfs_verbosity > 0)) {
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ecryptfs_printk(KERN_DEBUG, "Encrypting extent "
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"with iv:\n");
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ecryptfs_dump_hex(extent_iv, crypt_stat->iv_bytes);
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ecryptfs_printk(KERN_DEBUG, "First 8 bytes before "
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"encryption:\n");
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ecryptfs_dump_hex((char *)
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(page_address(ctx->page)
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+ (extent_offset
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* crypt_stat->extent_size)), 8);
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ecryptfs_lower_offset_for_extent(
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&offset, ((page->index * (PAGE_CACHE_SIZE
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/ crypt_stat->extent_size))
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+ extent_offset), crypt_stat);
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rc = ecryptfs_write_lower(ecryptfs_inode, enc_extent_virt,
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offset, crypt_stat->extent_size);
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if (rc) {
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ecryptfs_printk(KERN_ERR, "Error attempting "
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"to write lower page; rc = [%d]"
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"\n", rc);
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goto out;
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}
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rc = ecryptfs_encrypt_page_offset(
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crypt_stat, lower_page, lower_byte_offset, ctx->page,
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(extent_offset * crypt_stat->extent_size),
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crypt_stat->extent_size, extent_iv);
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ecryptfs_printk(KERN_DEBUG, "Encrypt extent [0x%.16x]; "
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"rc = [%d]\n",
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(base_extent + extent_offset), rc);
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if (unlikely(ecryptfs_verbosity > 0)) {
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ecryptfs_printk(KERN_DEBUG, "First 8 bytes after "
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"encryption:\n");
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ecryptfs_dump_hex((char *)(page_address(lower_page)
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+ lower_byte_offset), 8);
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}
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page_state = ECRYPTFS_PAGE_STATE_MODIFIED;
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extent_offset++;
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}
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BUG_ON(orig_byte_offset != 0);
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rc = ecryptfs_write_out_page(ctx, lower_page, lower_inode, 0,
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(lower_byte_offset
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+ crypt_stat->extent_size));
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out:
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kfree(enc_extent_virt);
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return rc;
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}
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static int ecryptfs_decrypt_extent(struct page *page,
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struct ecryptfs_crypt_stat *crypt_stat,
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struct page *enc_extent_page,
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unsigned long extent_offset)
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{
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unsigned long extent_base;
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char extent_iv[ECRYPTFS_MAX_IV_BYTES];
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int rc;
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extent_base = (page->index
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* (PAGE_CACHE_SIZE / crypt_stat->extent_size));
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rc = ecryptfs_derive_iv(extent_iv, crypt_stat,
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(extent_base + extent_offset));
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if (rc) {
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ecryptfs_printk(KERN_ERR, "Error attempting to write out "
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"page; rc = [%d]\n", rc);
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goto out;
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ecryptfs_printk(KERN_ERR, "Error attempting to "
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"derive IV for extent [0x%.16x]; "
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"rc = [%d]\n", (extent_base + extent_offset),
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rc);
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goto out;
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}
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if (unlikely(ecryptfs_verbosity > 0)) {
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ecryptfs_printk(KERN_DEBUG, "Decrypting extent "
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"with iv:\n");
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ecryptfs_dump_hex(extent_iv, crypt_stat->iv_bytes);
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ecryptfs_printk(KERN_DEBUG, "First 8 bytes before "
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"decryption:\n");
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ecryptfs_dump_hex((char *)
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(page_address(enc_extent_page)
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+ (extent_offset * crypt_stat->extent_size)),
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8);
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}
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rc = ecryptfs_decrypt_page_offset(crypt_stat, page,
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||||
(extent_offset
|
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* crypt_stat->extent_size),
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||||
enc_extent_page, 0,
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||||
crypt_stat->extent_size, extent_iv);
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||||
if (rc < 0) {
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||||
printk(KERN_ERR "%s: Error attempting to decrypt to page with "
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||||
"page->index = [%ld], extent_offset = [%ld]; "
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||||
"rc = [%d]\n", __FUNCTION__, page->index, extent_offset,
|
||||
rc);
|
||||
goto out;
|
||||
}
|
||||
rc = 0;
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||||
if (unlikely(ecryptfs_verbosity > 0)) {
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||||
ecryptfs_printk(KERN_DEBUG, "Decrypt extent [0x%.16x]; "
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||||
"rc = [%d]\n", (extent_base + extent_offset),
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||||
rc);
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||||
ecryptfs_printk(KERN_DEBUG, "First 8 bytes after "
|
||||
"decryption:\n");
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||||
ecryptfs_dump_hex((char *)(page_address(page)
|
||||
+ (extent_offset
|
||||
* crypt_stat->extent_size)), 8);
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||||
}
|
||||
out:
|
||||
return rc;
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||||
|
|
@ -607,8 +683,9 @@ out:
|
|||
|
||||
/**
|
||||
* ecryptfs_decrypt_page
|
||||
* @file: The ecryptfs file
|
||||
* @page: The page in ecryptfs to decrypt
|
||||
* @page: Page mapped from the eCryptfs inode for the file; data read
|
||||
* and decrypted from the lower file will be written into this
|
||||
* page
|
||||
*
|
||||
* Decrypt an eCryptfs page. This is done on a per-extent basis. Note
|
||||
* that eCryptfs pages may straddle the lower pages -- for instance,
|
||||
|
|
@ -620,103 +697,69 @@ out:
|
|||
*
|
||||
* Returns zero on success; negative on error
|
||||
*/
|
||||
int ecryptfs_decrypt_page(struct file *file, struct page *page)
|
||||
int ecryptfs_decrypt_page(struct page *page)
|
||||
{
|
||||
char extent_iv[ECRYPTFS_MAX_IV_BYTES];
|
||||
unsigned long base_extent;
|
||||
unsigned long extent_offset = 0;
|
||||
unsigned long lower_page_idx = 0;
|
||||
unsigned long prior_lower_page_idx = 0;
|
||||
struct page *lower_page;
|
||||
char *lower_page_virt = NULL;
|
||||
struct inode *lower_inode;
|
||||
struct inode *ecryptfs_inode;
|
||||
struct ecryptfs_crypt_stat *crypt_stat;
|
||||
char *enc_extent_virt = NULL;
|
||||
struct page *enc_extent_page;
|
||||
unsigned long extent_offset;
|
||||
int rc = 0;
|
||||
int byte_offset;
|
||||
int num_extents_per_page;
|
||||
int page_state;
|
||||
|
||||
crypt_stat = &(ecryptfs_inode_to_private(
|
||||
page->mapping->host)->crypt_stat);
|
||||
lower_inode = ecryptfs_inode_to_lower(page->mapping->host);
|
||||
ecryptfs_inode = page->mapping->host;
|
||||
crypt_stat =
|
||||
&(ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat);
|
||||
if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
|
||||
rc = ecryptfs_do_readpage(file, page, page->index);
|
||||
rc = ecryptfs_read_lower_page_segment(page, page->index, 0,
|
||||
PAGE_CACHE_SIZE,
|
||||
ecryptfs_inode);
|
||||
if (rc)
|
||||
ecryptfs_printk(KERN_ERR, "Error attempting to copy "
|
||||
"page at index [0x%.16x]\n",
|
||||
page->index);
|
||||
goto out;
|
||||
printk(KERN_ERR "%s: Error attempting to copy "
|
||||
"page at index [%ld]\n", __FUNCTION__,
|
||||
page->index);
|
||||
goto out_clear_uptodate;
|
||||
}
|
||||
num_extents_per_page = PAGE_CACHE_SIZE / crypt_stat->extent_size;
|
||||
base_extent = (page->index * num_extents_per_page);
|
||||
lower_page_virt = kmem_cache_alloc(ecryptfs_lower_page_cache,
|
||||
GFP_KERNEL);
|
||||
if (!lower_page_virt) {
|
||||
enc_extent_virt = kmalloc(PAGE_CACHE_SIZE, GFP_USER);
|
||||
if (!enc_extent_virt) {
|
||||
rc = -ENOMEM;
|
||||
ecryptfs_printk(KERN_ERR, "Error getting page for encrypted "
|
||||
"lower page(s)\n");
|
||||
goto out;
|
||||
ecryptfs_printk(KERN_ERR, "Error allocating memory for "
|
||||
"encrypted extent\n");
|
||||
goto out_clear_uptodate;
|
||||
}
|
||||
lower_page = virt_to_page(lower_page_virt);
|
||||
page_state = ECRYPTFS_PAGE_STATE_UNREAD;
|
||||
while (extent_offset < num_extents_per_page) {
|
||||
ecryptfs_extent_to_lwr_pg_idx_and_offset(
|
||||
&lower_page_idx, &byte_offset, crypt_stat,
|
||||
(base_extent + extent_offset));
|
||||
if (prior_lower_page_idx != lower_page_idx
|
||||
|| page_state == ECRYPTFS_PAGE_STATE_UNREAD) {
|
||||
rc = ecryptfs_do_readpage(file, lower_page,
|
||||
lower_page_idx);
|
||||
if (rc) {
|
||||
ecryptfs_printk(KERN_ERR, "Error reading "
|
||||
"lower encrypted page; rc = "
|
||||
"[%d]\n", rc);
|
||||
goto out;
|
||||
}
|
||||
prior_lower_page_idx = lower_page_idx;
|
||||
page_state = ECRYPTFS_PAGE_STATE_READ;
|
||||
}
|
||||
rc = ecryptfs_derive_iv(extent_iv, crypt_stat,
|
||||
(base_extent + extent_offset));
|
||||
enc_extent_page = virt_to_page(enc_extent_virt);
|
||||
for (extent_offset = 0;
|
||||
extent_offset < (PAGE_CACHE_SIZE / crypt_stat->extent_size);
|
||||
extent_offset++) {
|
||||
loff_t offset;
|
||||
|
||||
ecryptfs_lower_offset_for_extent(
|
||||
&offset, ((page->index * (PAGE_CACHE_SIZE
|
||||
/ crypt_stat->extent_size))
|
||||
+ extent_offset), crypt_stat);
|
||||
rc = ecryptfs_read_lower(enc_extent_virt, offset,
|
||||
crypt_stat->extent_size,
|
||||
ecryptfs_inode);
|
||||
if (rc) {
|
||||
ecryptfs_printk(KERN_ERR, "Error attempting to "
|
||||
"derive IV for extent [0x%.16x]; rc = "
|
||||
"[%d]\n",
|
||||
(base_extent + extent_offset), rc);
|
||||
goto out;
|
||||
ecryptfs_printk(KERN_ERR, "Error attempting "
|
||||
"to read lower page; rc = [%d]"
|
||||
"\n", rc);
|
||||
goto out_clear_uptodate;
|
||||
}
|
||||
if (unlikely(ecryptfs_verbosity > 0)) {
|
||||
ecryptfs_printk(KERN_DEBUG, "Decrypting extent "
|
||||
"with iv:\n");
|
||||
ecryptfs_dump_hex(extent_iv, crypt_stat->iv_bytes);
|
||||
ecryptfs_printk(KERN_DEBUG, "First 8 bytes before "
|
||||
"decryption:\n");
|
||||
ecryptfs_dump_hex((lower_page_virt + byte_offset), 8);
|
||||
}
|
||||
rc = ecryptfs_decrypt_page_offset(crypt_stat, page,
|
||||
(extent_offset
|
||||
* crypt_stat->extent_size),
|
||||
lower_page, byte_offset,
|
||||
crypt_stat->extent_size,
|
||||
extent_iv);
|
||||
if (rc != crypt_stat->extent_size) {
|
||||
ecryptfs_printk(KERN_ERR, "Error attempting to "
|
||||
"decrypt extent [0x%.16x]\n",
|
||||
(base_extent + extent_offset));
|
||||
goto out;
|
||||
}
|
||||
rc = 0;
|
||||
if (unlikely(ecryptfs_verbosity > 0)) {
|
||||
ecryptfs_printk(KERN_DEBUG, "First 8 bytes after "
|
||||
"decryption:\n");
|
||||
ecryptfs_dump_hex((char *)(page_address(page)
|
||||
+ byte_offset), 8);
|
||||
rc = ecryptfs_decrypt_extent(page, crypt_stat, enc_extent_page,
|
||||
extent_offset);
|
||||
if (rc) {
|
||||
printk(KERN_ERR "%s: Error encrypting extent; "
|
||||
"rc = [%d]\n", __FUNCTION__, rc);
|
||||
goto out_clear_uptodate;
|
||||
}
|
||||
extent_offset++;
|
||||
}
|
||||
SetPageUptodate(page);
|
||||
goto out;
|
||||
out_clear_uptodate:
|
||||
ClearPageUptodate(page);
|
||||
out:
|
||||
if (lower_page_virt)
|
||||
kmem_cache_free(ecryptfs_lower_page_cache, lower_page_virt);
|
||||
kfree(enc_extent_virt);
|
||||
return rc;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -552,13 +552,7 @@ void ecryptfs_destroy_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat);
|
|||
void ecryptfs_destroy_mount_crypt_stat(
|
||||
struct ecryptfs_mount_crypt_stat *mount_crypt_stat);
|
||||
int ecryptfs_init_crypt_ctx(struct ecryptfs_crypt_stat *crypt_stat);
|
||||
#define ECRYPTFS_LOWER_I_MUTEX_NOT_HELD 0
|
||||
#define ECRYPTFS_LOWER_I_MUTEX_HELD 1
|
||||
int ecryptfs_write_inode_size_to_metadata(struct file *lower_file,
|
||||
struct inode *lower_inode,
|
||||
struct inode *inode,
|
||||
struct dentry *ecryptfs_dentry,
|
||||
int lower_i_mutex_held);
|
||||
int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptefs_inode);
|
||||
int ecryptfs_get_lower_page(struct page **lower_page, struct inode *lower_inode,
|
||||
struct file *lower_file,
|
||||
unsigned long lower_page_index, int byte_offset,
|
||||
|
|
@ -574,8 +568,8 @@ int ecryptfs_do_readpage(struct file *file, struct page *page,
|
|||
int ecryptfs_writepage_and_release_lower_page(struct page *lower_page,
|
||||
struct inode *lower_inode,
|
||||
struct writeback_control *wbc);
|
||||
int ecryptfs_encrypt_page(struct ecryptfs_page_crypt_context *ctx);
|
||||
int ecryptfs_decrypt_page(struct file *file, struct page *page);
|
||||
int ecryptfs_encrypt_page(struct page *page);
|
||||
int ecryptfs_decrypt_page(struct page *page);
|
||||
int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry,
|
||||
struct file *lower_file);
|
||||
int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry,
|
||||
|
|
@ -655,6 +649,8 @@ int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
|
|||
char *sig);
|
||||
int ecryptfs_write_zeros(struct file *file, pgoff_t index, int start,
|
||||
int num_zeros);
|
||||
void ecryptfs_lower_offset_for_extent(loff_t *offset, loff_t extent_num,
|
||||
struct ecryptfs_crypt_stat *crypt_stat);
|
||||
int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data,
|
||||
loff_t offset, size_t size);
|
||||
int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode,
|
||||
|
|
|
|||
|
|
@ -168,9 +168,7 @@ static int grow_file(struct dentry *ecryptfs_dentry, struct file *lower_file,
|
|||
goto out;
|
||||
}
|
||||
i_size_write(inode, 0);
|
||||
rc = ecryptfs_write_inode_size_to_metadata(lower_file, lower_inode,
|
||||
inode, ecryptfs_dentry,
|
||||
ECRYPTFS_LOWER_I_MUTEX_NOT_HELD);
|
||||
rc = ecryptfs_write_inode_size_to_metadata(inode);
|
||||
ecryptfs_inode_to_private(inode)->crypt_stat.flags |= ECRYPTFS_NEW_FILE;
|
||||
out:
|
||||
return rc;
|
||||
|
|
@ -798,9 +796,7 @@ int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
|
|||
goto out_fput;
|
||||
}
|
||||
i_size_write(inode, new_length);
|
||||
rc = ecryptfs_write_inode_size_to_metadata(
|
||||
lower_file, lower_dentry->d_inode, inode, dentry,
|
||||
ECRYPTFS_LOWER_I_MUTEX_NOT_HELD);
|
||||
rc = ecryptfs_write_inode_size_to_metadata(inode);
|
||||
if (rc) {
|
||||
printk(KERN_ERR "Problem with "
|
||||
"ecryptfs_write_inode_size_to_metadata; "
|
||||
|
|
@ -829,9 +825,7 @@ int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
|
|||
}
|
||||
}
|
||||
vmtruncate(inode, new_length);
|
||||
rc = ecryptfs_write_inode_size_to_metadata(
|
||||
lower_file, lower_dentry->d_inode, inode, dentry,
|
||||
ECRYPTFS_LOWER_I_MUTEX_NOT_HELD);
|
||||
rc = ecryptfs_write_inode_size_to_metadata(inode);
|
||||
if (rc) {
|
||||
printk(KERN_ERR "Problem with "
|
||||
"ecryptfs_write_inode_size_to_metadata; "
|
||||
|
|
|
|||
|
|
@ -171,13 +171,9 @@ out:
|
|||
*/
|
||||
static int ecryptfs_writepage(struct page *page, struct writeback_control *wbc)
|
||||
{
|
||||
struct ecryptfs_page_crypt_context ctx;
|
||||
int rc;
|
||||
|
||||
ctx.page = page;
|
||||
ctx.mode = ECRYPTFS_WRITEPAGE_MODE;
|
||||
ctx.param.wbc = wbc;
|
||||
rc = ecryptfs_encrypt_page(&ctx);
|
||||
rc = ecryptfs_encrypt_page(page);
|
||||
if (rc) {
|
||||
ecryptfs_printk(KERN_WARNING, "Error encrypting "
|
||||
"page (upper index [0x%.16x])\n", page->index);
|
||||
|
|
@ -341,7 +337,7 @@ static int ecryptfs_readpage(struct file *file, struct page *page)
|
|||
}
|
||||
}
|
||||
} else {
|
||||
rc = ecryptfs_decrypt_page(file, page);
|
||||
rc = ecryptfs_decrypt_page(page);
|
||||
if (rc) {
|
||||
ecryptfs_printk(KERN_ERR, "Error decrypting page; "
|
||||
"rc = [%d]\n", rc);
|
||||
|
|
@ -459,58 +455,48 @@ static void ecryptfs_release_lower_page(struct page *lower_page)
|
|||
*
|
||||
* Returns zero on success; non-zero on error.
|
||||
*/
|
||||
static int ecryptfs_write_inode_size_to_header(struct file *lower_file,
|
||||
struct inode *lower_inode,
|
||||
struct inode *inode)
|
||||
static int ecryptfs_write_inode_size_to_header(struct inode *ecryptfs_inode)
|
||||
{
|
||||
int rc = 0;
|
||||
struct page *header_page;
|
||||
char *header_virt;
|
||||
const struct address_space_operations *lower_a_ops;
|
||||
u64 file_size;
|
||||
char *file_size_virt;
|
||||
int rc;
|
||||
|
||||
header_page = grab_cache_page(lower_inode->i_mapping, 0);
|
||||
if (!header_page) {
|
||||
ecryptfs_printk(KERN_ERR, "grab_cache_page for "
|
||||
"lower_page_index 0 failed\n");
|
||||
rc = -EINVAL;
|
||||
file_size_virt = kmalloc(sizeof(u64), GFP_KERNEL);
|
||||
if (!file_size_virt) {
|
||||
rc = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
lower_a_ops = lower_inode->i_mapping->a_ops;
|
||||
rc = lower_a_ops->prepare_write(lower_file, header_page, 0, 8);
|
||||
if (rc) {
|
||||
ecryptfs_release_lower_page(header_page);
|
||||
goto out;
|
||||
}
|
||||
file_size = (u64)i_size_read(inode);
|
||||
ecryptfs_printk(KERN_DEBUG, "Writing size: [0x%.16x]\n", file_size);
|
||||
file_size = (u64)i_size_read(ecryptfs_inode);
|
||||
file_size = cpu_to_be64(file_size);
|
||||
header_virt = kmap_atomic(header_page, KM_USER0);
|
||||
memcpy(header_virt, &file_size, sizeof(u64));
|
||||
kunmap_atomic(header_virt, KM_USER0);
|
||||
flush_dcache_page(header_page);
|
||||
rc = lower_a_ops->commit_write(lower_file, header_page, 0, 8);
|
||||
if (rc < 0)
|
||||
ecryptfs_printk(KERN_ERR, "Error commiting header page "
|
||||
"write\n");
|
||||
ecryptfs_release_lower_page(header_page);
|
||||
lower_inode->i_mtime = lower_inode->i_ctime = CURRENT_TIME;
|
||||
mark_inode_dirty_sync(inode);
|
||||
memcpy(file_size_virt, &file_size, sizeof(u64));
|
||||
rc = ecryptfs_write_lower(ecryptfs_inode, file_size_virt, 0,
|
||||
sizeof(u64));
|
||||
kfree(file_size_virt);
|
||||
if (rc)
|
||||
printk(KERN_ERR "%s: Error writing file size to header; "
|
||||
"rc = [%d]\n", __FUNCTION__, rc);
|
||||
out:
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int ecryptfs_write_inode_size_to_xattr(struct inode *lower_inode,
|
||||
struct inode *inode,
|
||||
struct dentry *ecryptfs_dentry,
|
||||
int lower_i_mutex_held)
|
||||
struct kmem_cache *ecryptfs_xattr_cache;
|
||||
|
||||
static int ecryptfs_write_inode_size_to_xattr(struct inode *ecryptfs_inode)
|
||||
{
|
||||
ssize_t size;
|
||||
void *xattr_virt;
|
||||
struct dentry *lower_dentry;
|
||||
struct dentry *lower_dentry =
|
||||
ecryptfs_inode_to_private(ecryptfs_inode)->lower_file->f_dentry;
|
||||
struct inode *lower_inode = lower_dentry->d_inode;
|
||||
u64 file_size;
|
||||
int rc;
|
||||
|
||||
if (!lower_inode->i_op->getxattr || !lower_inode->i_op->setxattr) {
|
||||
printk(KERN_WARNING
|
||||
"No support for setting xattr in lower filesystem\n");
|
||||
rc = -ENOSYS;
|
||||
goto out;
|
||||
}
|
||||
xattr_virt = kmem_cache_alloc(ecryptfs_xattr_cache, GFP_KERNEL);
|
||||
if (!xattr_virt) {
|
||||
printk(KERN_ERR "Out of memory whilst attempting to write "
|
||||
|
|
@ -518,35 +504,17 @@ static int ecryptfs_write_inode_size_to_xattr(struct inode *lower_inode,
|
|||
rc = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
|
||||
if (!lower_dentry->d_inode->i_op->getxattr ||
|
||||
!lower_dentry->d_inode->i_op->setxattr) {
|
||||
printk(KERN_WARNING
|
||||
"No support for setting xattr in lower filesystem\n");
|
||||
rc = -ENOSYS;
|
||||
kmem_cache_free(ecryptfs_xattr_cache, xattr_virt);
|
||||
goto out;
|
||||
}
|
||||
if (!lower_i_mutex_held)
|
||||
mutex_lock(&lower_dentry->d_inode->i_mutex);
|
||||
size = lower_dentry->d_inode->i_op->getxattr(lower_dentry,
|
||||
ECRYPTFS_XATTR_NAME,
|
||||
xattr_virt,
|
||||
PAGE_CACHE_SIZE);
|
||||
if (!lower_i_mutex_held)
|
||||
mutex_unlock(&lower_dentry->d_inode->i_mutex);
|
||||
mutex_lock(&lower_inode->i_mutex);
|
||||
size = lower_inode->i_op->getxattr(lower_dentry, ECRYPTFS_XATTR_NAME,
|
||||
xattr_virt, PAGE_CACHE_SIZE);
|
||||
if (size < 0)
|
||||
size = 8;
|
||||
file_size = (u64)i_size_read(inode);
|
||||
file_size = (u64)i_size_read(ecryptfs_inode);
|
||||
file_size = cpu_to_be64(file_size);
|
||||
memcpy(xattr_virt, &file_size, sizeof(u64));
|
||||
if (!lower_i_mutex_held)
|
||||
mutex_lock(&lower_dentry->d_inode->i_mutex);
|
||||
rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry,
|
||||
ECRYPTFS_XATTR_NAME,
|
||||
xattr_virt, size, 0);
|
||||
if (!lower_i_mutex_held)
|
||||
mutex_unlock(&lower_dentry->d_inode->i_mutex);
|
||||
rc = lower_inode->i_op->setxattr(lower_dentry, ECRYPTFS_XATTR_NAME,
|
||||
xattr_virt, size, 0);
|
||||
mutex_unlock(&lower_inode->i_mutex);
|
||||
if (rc)
|
||||
printk(KERN_ERR "Error whilst attempting to write inode size "
|
||||
"to lower file xattr; rc = [%d]\n", rc);
|
||||
|
|
@ -555,24 +523,15 @@ out:
|
|||
return rc;
|
||||
}
|
||||
|
||||
int
|
||||
ecryptfs_write_inode_size_to_metadata(struct file *lower_file,
|
||||
struct inode *lower_inode,
|
||||
struct inode *inode,
|
||||
struct dentry *ecryptfs_dentry,
|
||||
int lower_i_mutex_held)
|
||||
int ecryptfs_write_inode_size_to_metadata(struct inode *ecryptfs_inode)
|
||||
{
|
||||
struct ecryptfs_crypt_stat *crypt_stat;
|
||||
|
||||
crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
|
||||
crypt_stat = &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
|
||||
if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
|
||||
return ecryptfs_write_inode_size_to_xattr(lower_inode, inode,
|
||||
ecryptfs_dentry,
|
||||
lower_i_mutex_held);
|
||||
return ecryptfs_write_inode_size_to_xattr(ecryptfs_inode);
|
||||
else
|
||||
return ecryptfs_write_inode_size_to_header(lower_file,
|
||||
lower_inode,
|
||||
inode);
|
||||
return ecryptfs_write_inode_size_to_header(ecryptfs_inode);
|
||||
}
|
||||
|
||||
int ecryptfs_get_lower_page(struct page **lower_page, struct inode *lower_inode,
|
||||
|
|
@ -659,8 +618,6 @@ out:
|
|||
return rc;
|
||||
}
|
||||
|
||||
struct kmem_cache *ecryptfs_xattr_cache;
|
||||
|
||||
/**
|
||||
* ecryptfs_commit_write
|
||||
* @file: The eCryptfs file object
|
||||
|
|
@ -675,7 +632,6 @@ struct kmem_cache *ecryptfs_xattr_cache;
|
|||
static int ecryptfs_commit_write(struct file *file, struct page *page,
|
||||
unsigned from, unsigned to)
|
||||
{
|
||||
struct ecryptfs_page_crypt_context ctx;
|
||||
loff_t pos;
|
||||
struct inode *inode;
|
||||
struct inode *lower_inode;
|
||||
|
|
@ -705,10 +661,7 @@ static int ecryptfs_commit_write(struct file *file, struct page *page,
|
|||
page->index);
|
||||
goto out;
|
||||
}
|
||||
ctx.page = page;
|
||||
ctx.mode = ECRYPTFS_PREPARE_COMMIT_MODE;
|
||||
ctx.param.lower_file = lower_file;
|
||||
rc = ecryptfs_encrypt_page(&ctx);
|
||||
rc = ecryptfs_encrypt_page(page);
|
||||
if (rc) {
|
||||
ecryptfs_printk(KERN_WARNING, "Error encrypting page (upper "
|
||||
"index [0x%.16x])\n", page->index);
|
||||
|
|
@ -721,9 +674,7 @@ static int ecryptfs_commit_write(struct file *file, struct page *page,
|
|||
ecryptfs_printk(KERN_DEBUG, "Expanded file size to "
|
||||
"[0x%.16x]\n", i_size_read(inode));
|
||||
}
|
||||
rc = ecryptfs_write_inode_size_to_metadata(lower_file, lower_inode,
|
||||
inode, file->f_dentry,
|
||||
ECRYPTFS_LOWER_I_MUTEX_HELD);
|
||||
rc = ecryptfs_write_inode_size_to_metadata(inode);
|
||||
if (rc)
|
||||
printk(KERN_ERR "Error writing inode size to metadata; "
|
||||
"rc = [%d]\n", rc);
|
||||
|
|
|
|||
|
|
@ -154,8 +154,8 @@ int ecryptfs_write(struct file *ecryptfs_file, char *data, loff_t offset,
|
|||
/* Read in the page from the lower
|
||||
* into the eCryptfs inode page cache,
|
||||
* decrypting */
|
||||
if ((rc = ecryptfs_decrypt_page(NULL, /* placeholder for git-bisect */
|
||||
ecryptfs_page))) {
|
||||
rc = ecryptfs_decrypt_page(ecryptfs_page);
|
||||
if (rc) {
|
||||
printk(KERN_ERR "%s: Error decrypting "
|
||||
"page; rc = [%d]\n",
|
||||
__FUNCTION__, rc);
|
||||
|
|
@ -178,7 +178,7 @@ int ecryptfs_write(struct file *ecryptfs_file, char *data, loff_t offset,
|
|||
}
|
||||
kunmap_atomic(ecryptfs_page_virt, KM_USER0);
|
||||
flush_dcache_page(ecryptfs_page);
|
||||
rc = ecryptfs_encrypt_page(NULL /* placeholder for git-bisect */);
|
||||
rc = ecryptfs_encrypt_page(ecryptfs_page);
|
||||
if (rc) {
|
||||
printk(KERN_ERR "%s: Error encrypting "
|
||||
"page; rc = [%d]\n", __FUNCTION__, rc);
|
||||
|
|
@ -190,8 +190,8 @@ int ecryptfs_write(struct file *ecryptfs_file, char *data, loff_t offset,
|
|||
}
|
||||
if ((offset + size) > ecryptfs_file_size) {
|
||||
i_size_write(ecryptfs_file->f_dentry->d_inode, (offset + size));
|
||||
rc = ecryptfs_write_inode_size_to_metadata(NULL, NULL, NULL,
|
||||
NULL, 0); /* placeholders for git-bisect */
|
||||
rc = ecryptfs_write_inode_size_to_metadata(
|
||||
ecryptfs_file->f_dentry->d_inode);
|
||||
if (rc) {
|
||||
printk(KERN_ERR "Problem with "
|
||||
"ecryptfs_write_inode_size_to_metadata; "
|
||||
|
|
@ -338,7 +338,7 @@ int ecryptfs_read(char *data, loff_t offset, size_t size,
|
|||
ecryptfs_page_idx, rc);
|
||||
goto out;
|
||||
}
|
||||
rc = ecryptfs_decrypt_page(NULL /* placeholder for git-bisect */, ecryptfs_page);
|
||||
rc = ecryptfs_decrypt_page(ecryptfs_page);
|
||||
if (rc) {
|
||||
printk(KERN_ERR "%s: Error decrypting "
|
||||
"page; rc = [%d]\n", __FUNCTION__, rc);
|
||||
|
|
|
|||
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Ссылка в новой задаче