return rc;
}
-int ecryptfs_crypto_api_algify_cipher_name(char **algified_name,
- char *cipher_name,
- char *chaining_modifier)
+static int ecryptfs_crypto_api_algify_cipher_name(char **algified_name,
+ char *cipher_name,
+ char *chaining_modifier)
{
int cipher_name_len = strlen(cipher_name);
int chaining_modifier_len = strlen(chaining_modifier);
* ecryptfs_derive_iv
* @iv: destination for the derived iv vale
* @crypt_stat: Pointer to crypt_stat struct for the current inode
- * @offset: Offset of the page whose's iv we are to derive
+ * @offset: Offset of the extent whose IV we are to derive
*
* Generate the initialization vector from the given root IV and page
* offset.
* Returns zero on success; non-zero on error.
*/
static int ecryptfs_derive_iv(char *iv, struct ecryptfs_crypt_stat *crypt_stat,
- pgoff_t offset)
+ loff_t offset)
{
int rc = 0;
char dst[MD5_DIGEST_SIZE];
* hashing business. -Halcrow */
memcpy(src, crypt_stat->root_iv, crypt_stat->iv_bytes);
memset((src + crypt_stat->iv_bytes), 0, 16);
- snprintf((src + crypt_stat->iv_bytes), 16, "%ld", offset);
+ snprintf((src + crypt_stat->iv_bytes), 16, "%lld", offset);
if (unlikely(ecryptfs_verbosity > 0)) {
ecryptfs_printk(KERN_DEBUG, "source:\n");
ecryptfs_dump_hex(src, (crypt_stat->iv_bytes + 16));
return rc;
}
-static void
-ecryptfs_extent_to_lwr_pg_idx_and_offset(unsigned long *lower_page_idx,
- int *byte_offset,
- struct ecryptfs_crypt_stat *crypt_stat,
- unsigned long extent_num)
+/**
+ * ecryptfs_lower_offset_for_extent
+ *
+ * Convert an eCryptfs page index into a lower byte offset
+ */
+void ecryptfs_lower_offset_for_extent(loff_t *offset, loff_t extent_num,
+ struct ecryptfs_crypt_stat *crypt_stat)
{
- unsigned long lower_extent_num;
- int extents_occupied_by_headers_at_front;
- int bytes_occupied_by_headers_at_front;
- int extent_offset;
- int extents_per_page;
-
- bytes_occupied_by_headers_at_front =
- ( crypt_stat->header_extent_size
- * crypt_stat->num_header_extents_at_front );
- extents_occupied_by_headers_at_front =
- ( bytes_occupied_by_headers_at_front
- / crypt_stat->extent_size );
- lower_extent_num = extents_occupied_by_headers_at_front + extent_num;
- extents_per_page = PAGE_CACHE_SIZE / crypt_stat->extent_size;
- (*lower_page_idx) = lower_extent_num / extents_per_page;
- extent_offset = lower_extent_num % extents_per_page;
- (*byte_offset) = extent_offset * crypt_stat->extent_size;
- ecryptfs_printk(KERN_DEBUG, " * crypt_stat->header_extent_size = "
- "[%d]\n", crypt_stat->header_extent_size);
- ecryptfs_printk(KERN_DEBUG, " * crypt_stat->"
- "num_header_extents_at_front = [%d]\n",
- crypt_stat->num_header_extents_at_front);
- ecryptfs_printk(KERN_DEBUG, " * extents_occupied_by_headers_at_"
- "front = [%d]\n", extents_occupied_by_headers_at_front);
- ecryptfs_printk(KERN_DEBUG, " * lower_extent_num = [0x%.16x]\n",
- lower_extent_num);
- ecryptfs_printk(KERN_DEBUG, " * extents_per_page = [%d]\n",
- extents_per_page);
- ecryptfs_printk(KERN_DEBUG, " * (*lower_page_idx) = [0x%.16x]\n",
- (*lower_page_idx));
- ecryptfs_printk(KERN_DEBUG, " * extent_offset = [%d]\n",
- extent_offset);
- ecryptfs_printk(KERN_DEBUG, " * (*byte_offset) = [%d]\n",
- (*byte_offset));
+ (*offset) = ((crypt_stat->extent_size
+ * crypt_stat->num_header_extents_at_front)
+ + (crypt_stat->extent_size * extent_num));
}
-static int ecryptfs_write_out_page(struct ecryptfs_page_crypt_context *ctx,
- struct page *lower_page,
- struct inode *lower_inode,
- int byte_offset_in_page, int bytes_to_write)
+/**
+ * ecryptfs_encrypt_extent
+ * @enc_extent_page: Allocated page into which to encrypt the data in
+ * @page
+ * @crypt_stat: crypt_stat containing cryptographic context for the
+ * encryption operation
+ * @page: Page containing plaintext data extent to encrypt
+ * @extent_offset: Page extent offset for use in generating IV
+ *
+ * Encrypts one extent of data.
+ *
+ * Return zero on success; non-zero otherwise
+ */
+static int ecryptfs_encrypt_extent(struct page *enc_extent_page,
+ struct ecryptfs_crypt_stat *crypt_stat,
+ struct page *page,
+ unsigned long extent_offset)
{
- int rc = 0;
+ loff_t extent_base;
+ char extent_iv[ECRYPTFS_MAX_IV_BYTES];
+ int rc;
- if (ctx->mode == ECRYPTFS_PREPARE_COMMIT_MODE) {
- rc = ecryptfs_commit_lower_page(lower_page, lower_inode,
- ctx->param.lower_file,
- byte_offset_in_page,
- bytes_to_write);
- if (rc) {
- ecryptfs_printk(KERN_ERR, "Error calling lower "
- "commit; rc = [%d]\n", rc);
- goto out;
- }
- } else {
- rc = ecryptfs_writepage_and_release_lower_page(lower_page,
- lower_inode,
- ctx->param.wbc);
- if (rc) {
- ecryptfs_printk(KERN_ERR, "Error calling lower "
- "writepage(); rc = [%d]\n", rc);
- goto out;
- }
+ extent_base = (((loff_t)page->index)
+ * (PAGE_CACHE_SIZE / crypt_stat->extent_size));
+ rc = ecryptfs_derive_iv(extent_iv, crypt_stat,
+ (extent_base + extent_offset));
+ if (rc) {
+ ecryptfs_printk(KERN_ERR, "Error attempting to "
+ "derive IV for extent [0x%.16x]; "
+ "rc = [%d]\n", (extent_base + extent_offset),
+ rc);
+ goto out;
}
-out:
- return rc;
-}
-
-static int ecryptfs_read_in_page(struct ecryptfs_page_crypt_context *ctx,
- struct page **lower_page,
- struct inode *lower_inode,
- unsigned long lower_page_idx,
- int byte_offset_in_page)
-{
- int rc = 0;
-
- if (ctx->mode == ECRYPTFS_PREPARE_COMMIT_MODE) {
- /* TODO: Limit this to only the data extents that are
- * needed */
- rc = ecryptfs_get_lower_page(lower_page, lower_inode,
- ctx->param.lower_file,
- lower_page_idx,
- byte_offset_in_page,
- (PAGE_CACHE_SIZE
- - byte_offset_in_page));
- if (rc) {
- ecryptfs_printk(
- KERN_ERR, "Error attempting to grab, map, "
- "and prepare_write lower page with index "
- "[0x%.16x]; rc = [%d]\n", lower_page_idx, rc);
- goto out;
- }
- } else {
- *lower_page = grab_cache_page(lower_inode->i_mapping,
- lower_page_idx);
- if (!(*lower_page)) {
- rc = -EINVAL;
- ecryptfs_printk(
- KERN_ERR, "Error attempting to grab and map "
- "lower page with index [0x%.16x]; rc = [%d]\n",
- lower_page_idx, rc);
- goto out;
- }
+ if (unlikely(ecryptfs_verbosity > 0)) {
+ ecryptfs_printk(KERN_DEBUG, "Encrypting extent "
+ "with iv:\n");
+ ecryptfs_dump_hex(extent_iv, crypt_stat->iv_bytes);
+ ecryptfs_printk(KERN_DEBUG, "First 8 bytes before "
+ "encryption:\n");
+ ecryptfs_dump_hex((char *)
+ (page_address(page)
+ + (extent_offset * crypt_stat->extent_size)),
+ 8);
+ }
+ rc = ecryptfs_encrypt_page_offset(crypt_stat, enc_extent_page, 0,
+ page, (extent_offset
+ * crypt_stat->extent_size),
+ crypt_stat->extent_size, extent_iv);
+ if (rc < 0) {
+ printk(KERN_ERR "%s: Error attempting to encrypt page with "
+ "page->index = [%ld], extent_offset = [%ld]; "
+ "rc = [%d]\n", __FUNCTION__, page->index, extent_offset,
+ rc);
+ goto out;
+ }
+ rc = 0;
+ if (unlikely(ecryptfs_verbosity > 0)) {
+ ecryptfs_printk(KERN_DEBUG, "Encrypt extent [0x%.16x]; "
+ "rc = [%d]\n", (extent_base + extent_offset),
+ rc);
+ ecryptfs_printk(KERN_DEBUG, "First 8 bytes after "
+ "encryption:\n");
+ ecryptfs_dump_hex((char *)(page_address(enc_extent_page)), 8);
}
out:
return rc;
/**
* ecryptfs_encrypt_page
- * @ctx: The context of the page
+ * @page: Page mapped from the eCryptfs inode for the file; contains
+ * decrypted content that needs to be encrypted (to a temporary
+ * page; not in place) and written out to the lower file
*
* Encrypt an eCryptfs page. This is done on a per-extent basis. Note
* that eCryptfs pages may straddle the lower pages -- for instance,
* file, 24K of page 0 of the lower file will be read and decrypted,
* and then 8K of page 1 of the lower file will be read and decrypted.
*
- * The actual operations performed on each page depends on the
- * contents of the ecryptfs_page_crypt_context struct.
- *
* Returns zero on success; negative on error
*/
-int ecryptfs_encrypt_page(struct ecryptfs_page_crypt_context *ctx)
+int ecryptfs_encrypt_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;
- struct inode *lower_inode;
- struct ecryptfs_inode_info *inode_info;
+ struct inode *ecryptfs_inode;
struct ecryptfs_crypt_stat *crypt_stat;
+ char *enc_extent_virt = NULL;
+ struct page *enc_extent_page;
+ loff_t extent_offset;
int rc = 0;
- int lower_byte_offset = 0;
- int orig_byte_offset = 0;
- int num_extents_per_page;
-#define ECRYPTFS_PAGE_STATE_UNREAD 0
-#define ECRYPTFS_PAGE_STATE_READ 1
-#define ECRYPTFS_PAGE_STATE_MODIFIED 2
-#define ECRYPTFS_PAGE_STATE_WRITTEN 3
- int page_state;
-
- lower_inode = ecryptfs_inode_to_lower(ctx->page->mapping->host);
- inode_info = ecryptfs_inode_to_private(ctx->page->mapping->host);
- crypt_stat = &inode_info->crypt_stat;
+
+ ecryptfs_inode = page->mapping->host;
+ crypt_stat =
+ &(ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat);
if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
- rc = ecryptfs_copy_page_to_lower(ctx->page, lower_inode,
- ctx->param.lower_file);
+ rc = ecryptfs_write_lower_page_segment(ecryptfs_inode, page,
+ 0, PAGE_CACHE_SIZE);
if (rc)
- ecryptfs_printk(KERN_ERR, "Error attempting to copy "
- "page at index [0x%.16x]\n",
- ctx->page->index);
+ printk(KERN_ERR "%s: Error attempting to copy "
+ "page at index [%ld]\n", __FUNCTION__,
+ page->index);
goto out;
}
- num_extents_per_page = PAGE_CACHE_SIZE / crypt_stat->extent_size;
- base_extent = (ctx->page->index * num_extents_per_page);
- page_state = ECRYPTFS_PAGE_STATE_UNREAD;
- while (extent_offset < num_extents_per_page) {
- ecryptfs_extent_to_lwr_pg_idx_and_offset(
- &lower_page_idx, &lower_byte_offset, crypt_stat,
- (base_extent + extent_offset));
- if (prior_lower_page_idx != lower_page_idx
- && page_state == ECRYPTFS_PAGE_STATE_MODIFIED) {
- rc = ecryptfs_write_out_page(ctx, lower_page,
- lower_inode,
- orig_byte_offset,
- (PAGE_CACHE_SIZE
- - orig_byte_offset));
- if (rc) {
- ecryptfs_printk(KERN_ERR, "Error attempting "
- "to write out page; rc = [%d]"
- "\n", rc);
- goto out;
- }
- page_state = ECRYPTFS_PAGE_STATE_WRITTEN;
- }
- if (page_state == ECRYPTFS_PAGE_STATE_UNREAD
- || page_state == ECRYPTFS_PAGE_STATE_WRITTEN) {
- rc = ecryptfs_read_in_page(ctx, &lower_page,
- lower_inode, lower_page_idx,
- lower_byte_offset);
- if (rc) {
- ecryptfs_printk(KERN_ERR, "Error attempting "
- "to read in lower page with "
- "index [0x%.16x]; rc = [%d]\n",
- lower_page_idx, rc);
- goto out;
- }
- orig_byte_offset = lower_byte_offset;
- prior_lower_page_idx = lower_page_idx;
- page_state = ECRYPTFS_PAGE_STATE_READ;
- }
- BUG_ON(!(page_state == ECRYPTFS_PAGE_STATE_MODIFIED
- || page_state == ECRYPTFS_PAGE_STATE_READ));
- rc = ecryptfs_derive_iv(extent_iv, crypt_stat,
- (base_extent + extent_offset));
+ enc_extent_virt = kmalloc(PAGE_CACHE_SIZE, GFP_USER);
+ if (!enc_extent_virt) {
+ rc = -ENOMEM;
+ ecryptfs_printk(KERN_ERR, "Error allocating memory for "
+ "encrypted extent\n");
+ goto out;
+ }
+ 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;
+
+ rc = ecryptfs_encrypt_extent(enc_extent_page, crypt_stat, page,
+ extent_offset);
if (rc) {
- ecryptfs_printk(KERN_ERR, "Error attempting to "
- "derive IV for extent [0x%.16x]; "
- "rc = [%d]\n",
- (base_extent + extent_offset), rc);
+ printk(KERN_ERR "%s: Error encrypting extent; "
+ "rc = [%d]\n", __FUNCTION__, rc);
goto out;
}
- if (unlikely(ecryptfs_verbosity > 0)) {
- ecryptfs_printk(KERN_DEBUG, "Encrypting extent "
- "with iv:\n");
- ecryptfs_dump_hex(extent_iv, crypt_stat->iv_bytes);
- ecryptfs_printk(KERN_DEBUG, "First 8 bytes before "
- "encryption:\n");
- ecryptfs_dump_hex((char *)
- (page_address(ctx->page)
- + (extent_offset
- * crypt_stat->extent_size)), 8);
- }
- rc = ecryptfs_encrypt_page_offset(
- crypt_stat, lower_page, lower_byte_offset, ctx->page,
- (extent_offset * crypt_stat->extent_size),
- crypt_stat->extent_size, extent_iv);
- ecryptfs_printk(KERN_DEBUG, "Encrypt extent [0x%.16x]; "
- "rc = [%d]\n",
- (base_extent + extent_offset), rc);
- if (unlikely(ecryptfs_verbosity > 0)) {
- ecryptfs_printk(KERN_DEBUG, "First 8 bytes after "
- "encryption:\n");
- ecryptfs_dump_hex((char *)(page_address(lower_page)
- + lower_byte_offset), 8);
+ ecryptfs_lower_offset_for_extent(
+ &offset, ((((loff_t)page->index)
+ * (PAGE_CACHE_SIZE
+ / crypt_stat->extent_size))
+ + extent_offset), crypt_stat);
+ rc = ecryptfs_write_lower(ecryptfs_inode, enc_extent_virt,
+ offset, crypt_stat->extent_size);
+ if (rc) {
+ ecryptfs_printk(KERN_ERR, "Error attempting "
+ "to write lower page; rc = [%d]"
+ "\n", rc);
+ goto out;
}
- page_state = ECRYPTFS_PAGE_STATE_MODIFIED;
extent_offset++;
}
- BUG_ON(orig_byte_offset != 0);
- rc = ecryptfs_write_out_page(ctx, lower_page, lower_inode, 0,
- (lower_byte_offset
- + crypt_stat->extent_size));
+out:
+ kfree(enc_extent_virt);
+ return rc;
+}
+
+static int ecryptfs_decrypt_extent(struct page *page,
+ struct ecryptfs_crypt_stat *crypt_stat,
+ struct page *enc_extent_page,
+ unsigned long extent_offset)
+{
+ loff_t extent_base;
+ char extent_iv[ECRYPTFS_MAX_IV_BYTES];
+ int rc;
+
+ extent_base = (((loff_t)page->index)
+ * (PAGE_CACHE_SIZE / crypt_stat->extent_size));
+ rc = ecryptfs_derive_iv(extent_iv, crypt_stat,
+ (extent_base + extent_offset));
if (rc) {
- ecryptfs_printk(KERN_ERR, "Error attempting to write out "
- "page; rc = [%d]\n", rc);
- goto out;
+ ecryptfs_printk(KERN_ERR, "Error attempting to "
+ "derive IV for extent [0x%.16x]; "
+ "rc = [%d]\n", (extent_base + extent_offset),
+ rc);
+ goto out;
+ }
+ 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((char *)
+ (page_address(enc_extent_page)
+ + (extent_offset * crypt_stat->extent_size)),
+ 8);
+ }
+ rc = ecryptfs_decrypt_page_offset(crypt_stat, page,
+ (extent_offset
+ * crypt_stat->extent_size),
+ enc_extent_page, 0,
+ crypt_stat->extent_size, extent_iv);
+ if (rc < 0) {
+ printk(KERN_ERR "%s: Error attempting to decrypt to page with "
+ "page->index = [%ld], extent_offset = [%ld]; "
+ "rc = [%d]\n", __FUNCTION__, page->index, extent_offset,
+ rc);
+ goto out;
+ }
+ rc = 0;
+ if (unlikely(ecryptfs_verbosity > 0)) {
+ ecryptfs_printk(KERN_DEBUG, "Decrypt extent [0x%.16x]; "
+ "rc = [%d]\n", (extent_base + extent_offset),
+ rc);
+ ecryptfs_printk(KERN_DEBUG, "First 8 bytes after "
+ "decryption:\n");
+ ecryptfs_dump_hex((char *)(page_address(page)
+ + (extent_offset
+ * crypt_stat->extent_size)), 8);
}
out:
return rc;
/**
* 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,
*
* 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);
+ printk(KERN_ERR "%s: Error attempting to copy "
+ "page at index [%ld]\n", __FUNCTION__,
+ page->index);
goto out;
}
- 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");
+ ecryptfs_printk(KERN_ERR, "Error allocating memory for "
+ "encrypted extent\n");
goto out;
}
- 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);
+ ecryptfs_printk(KERN_ERR, "Error attempting "
+ "to read lower page; rc = [%d]"
+ "\n", rc);
goto out;
}
- 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));
+ 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;
}
- 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);
- }
extent_offset++;
}
out:
- if (lower_page_virt)
- kmem_cache_free(ecryptfs_lower_page_cache, lower_page_virt);
+ kfree(enc_extent_virt);
return rc;
}
crypt_stat->extent_size = ECRYPTFS_DEFAULT_EXTENT_SIZE;
set_extent_mask_and_shift(crypt_stat);
crypt_stat->iv_bytes = ECRYPTFS_DEFAULT_IV_BYTES;
- if (PAGE_CACHE_SIZE <= ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE) {
- crypt_stat->header_extent_size =
- ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE;
- } else
- crypt_stat->header_extent_size = PAGE_CACHE_SIZE;
if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR)
crypt_stat->num_header_extents_at_front = 0;
- else
- crypt_stat->num_header_extents_at_front = 1;
+ else {
+ if (PAGE_CACHE_SIZE <= ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE)
+ crypt_stat->num_header_extents_at_front =
+ (ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE
+ / crypt_stat->extent_size);
+ else
+ crypt_stat->num_header_extents_at_front =
+ (PAGE_CACHE_SIZE / crypt_stat->extent_size);
+ }
}
/**
return rc;
}
-/**
- * ecryptfs_read_header_region
- * @data: The virtual address to write header region data into
- * @dentry: The lower dentry
- * @mnt: The lower VFS mount
- *
- * Returns zero on success; non-zero otherwise
- */
-static int ecryptfs_read_header_region(char *data, struct dentry *dentry,
- struct vfsmount *mnt)
+int ecryptfs_read_and_validate_header_region(char *data,
+ struct inode *ecryptfs_inode)
{
- struct file *lower_file;
- mm_segment_t oldfs;
+ struct ecryptfs_crypt_stat *crypt_stat =
+ &(ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat);
int rc;
- if ((rc = ecryptfs_open_lower_file(&lower_file, dentry, mnt,
- O_RDONLY))) {
- printk(KERN_ERR
- "Error opening lower_file to read header region\n");
- goto out;
- }
- lower_file->f_pos = 0;
- oldfs = get_fs();
- set_fs(get_ds());
- rc = lower_file->f_op->read(lower_file, (char __user *)data,
- ECRYPTFS_DEFAULT_EXTENT_SIZE, &lower_file->f_pos);
- set_fs(oldfs);
- if ((rc = ecryptfs_close_lower_file(lower_file))) {
- printk(KERN_ERR "Error closing lower_file\n");
+ rc = ecryptfs_read_lower(data, 0, crypt_stat->extent_size,
+ ecryptfs_inode);
+ if (rc) {
+ printk(KERN_ERR "%s: Error reading header region; rc = [%d]\n",
+ __FUNCTION__, rc);
goto out;
}
- rc = 0;
-out:
- return rc;
-}
-
-int ecryptfs_read_and_validate_header_region(char *data, struct dentry *dentry,
- struct vfsmount *mnt)
-{
- int rc;
-
- rc = ecryptfs_read_header_region(data, dentry, mnt);
- if (rc)
- goto out;
- if (!contains_ecryptfs_marker(data + ECRYPTFS_FILE_SIZE_BYTES))
+ if (!contains_ecryptfs_marker(data + ECRYPTFS_FILE_SIZE_BYTES)) {
rc = -EINVAL;
+ ecryptfs_printk(KERN_DEBUG, "Valid marker not found\n");
+ }
out:
return rc;
}
-
void
ecryptfs_write_header_metadata(char *virt,
struct ecryptfs_crypt_stat *crypt_stat,
u32 header_extent_size;
u16 num_header_extents_at_front;
- header_extent_size = (u32)crypt_stat->header_extent_size;
+ header_extent_size = (u32)crypt_stat->extent_size;
num_header_extents_at_front =
(u16)crypt_stat->num_header_extents_at_front;
header_extent_size = cpu_to_be32(header_extent_size);
static int
ecryptfs_write_metadata_to_contents(struct ecryptfs_crypt_stat *crypt_stat,
- struct file *lower_file, char *page_virt)
+ struct dentry *ecryptfs_dentry,
+ char *page_virt)
{
- mm_segment_t oldfs;
int current_header_page;
int header_pages;
- ssize_t size;
- int rc = 0;
+ int rc;
- lower_file->f_pos = 0;
- oldfs = get_fs();
- set_fs(get_ds());
- size = vfs_write(lower_file, (char __user *)page_virt, PAGE_CACHE_SIZE,
- &lower_file->f_pos);
- if (size < 0) {
- rc = (int)size;
- printk(KERN_ERR "Error attempting to write lower page; "
- "rc = [%d]\n", rc);
- set_fs(oldfs);
+ rc = ecryptfs_write_lower(ecryptfs_dentry->d_inode, page_virt,
+ 0, PAGE_CACHE_SIZE);
+ if (rc) {
+ printk(KERN_ERR "%s: Error attempting to write header "
+ "information to lower file; rc = [%d]\n", __FUNCTION__,
+ rc);
goto out;
}
- header_pages = ((crypt_stat->header_extent_size
+ header_pages = ((crypt_stat->extent_size
* crypt_stat->num_header_extents_at_front)
/ PAGE_CACHE_SIZE);
memset(page_virt, 0, PAGE_CACHE_SIZE);
current_header_page = 1;
while (current_header_page < header_pages) {
- size = vfs_write(lower_file, (char __user *)page_virt,
- PAGE_CACHE_SIZE, &lower_file->f_pos);
- if (size < 0) {
- rc = (int)size;
- printk(KERN_ERR "Error attempting to write lower page; "
- "rc = [%d]\n", rc);
- set_fs(oldfs);
+ loff_t offset;
+
+ offset = (((loff_t)current_header_page) << PAGE_CACHE_SHIFT);
+ if ((rc = ecryptfs_write_lower(ecryptfs_dentry->d_inode,
+ page_virt, offset,
+ PAGE_CACHE_SIZE))) {
+ printk(KERN_ERR "%s: Error attempting to write header "
+ "information to lower file; rc = [%d]\n",
+ __FUNCTION__, rc);
goto out;
}
current_header_page++;
}
- set_fs(oldfs);
out:
return rc;
}
/**
* ecryptfs_write_metadata
* @ecryptfs_dentry: The eCryptfs dentry
- * @lower_file: The lower file struct, which was returned from dentry_open
*
* Write the file headers out. This will likely involve a userspace
* callout, in which the session key is encrypted with one or more
* retrieved via a prompt. Exactly what happens at this point should
* be policy-dependent.
*
+ * TODO: Support header information spanning multiple pages
+ *
* Returns zero on success; non-zero on error
*/
-int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry,
- struct file *lower_file)
+int ecryptfs_write_metadata(struct dentry *ecryptfs_dentry)
{
- struct ecryptfs_crypt_stat *crypt_stat;
+ struct ecryptfs_crypt_stat *crypt_stat =
+ &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat;
char *page_virt;
- size_t size;
+ size_t size = 0;
int rc = 0;
- crypt_stat = &ecryptfs_inode_to_private(
- ecryptfs_dentry->d_inode)->crypt_stat;
if (likely(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
if (!(crypt_stat->flags & ECRYPTFS_KEY_VALID)) {
- ecryptfs_printk(KERN_DEBUG, "Key is "
- "invalid; bailing out\n");
+ printk(KERN_ERR "Key is invalid; bailing out\n");
rc = -EINVAL;
goto out;
}
crypt_stat, page_virt,
size);
else
- rc = ecryptfs_write_metadata_to_contents(crypt_stat, lower_file,
+ rc = ecryptfs_write_metadata_to_contents(crypt_stat,
+ ecryptfs_dentry,
page_virt);
if (rc) {
printk(KERN_ERR "Error writing metadata out to lower file; "
u32 header_extent_size;
u16 num_header_extents_at_front;
- memcpy(&header_extent_size, virt, 4);
+ memcpy(&header_extent_size, virt, sizeof(u32));
header_extent_size = be32_to_cpu(header_extent_size);
- virt += 4;
- memcpy(&num_header_extents_at_front, virt, 2);
+ virt += sizeof(u32);
+ memcpy(&num_header_extents_at_front, virt, sizeof(u16));
num_header_extents_at_front = be16_to_cpu(num_header_extents_at_front);
- crypt_stat->header_extent_size = (int)header_extent_size;
crypt_stat->num_header_extents_at_front =
(int)num_header_extents_at_front;
- (*bytes_read) = 6;
+ (*bytes_read) = (sizeof(u32) + sizeof(u16));
if ((validate_header_size == ECRYPTFS_VALIDATE_HEADER_SIZE)
- && ((crypt_stat->header_extent_size
+ && ((crypt_stat->extent_size
* crypt_stat->num_header_extents_at_front)
< ECRYPTFS_MINIMUM_HEADER_EXTENT_SIZE)) {
rc = -EINVAL;
- ecryptfs_printk(KERN_WARNING, "Invalid header extent size: "
- "[%d]\n", crypt_stat->header_extent_size);
+ printk(KERN_WARNING "Invalid number of header extents: [%zd]\n",
+ crypt_stat->num_header_extents_at_front);
}
return rc;
}
*/
static void set_default_header_data(struct ecryptfs_crypt_stat *crypt_stat)
{
- crypt_stat->header_extent_size = 4096;
- crypt_stat->num_header_extents_at_front = 1;
+ crypt_stat->num_header_extents_at_front = 2;
}
/**
/**
* ecryptfs_read_xattr_region
* @page_virt: The vitual address into which to read the xattr data
- * @ecryptfs_dentry: The eCryptfs dentry
+ * @ecryptfs_inode: The eCryptfs inode
*
* Attempts to read the crypto metadata from the extended attribute
* region of the lower file.
*
* Returns zero on success; non-zero on error
*/
-int ecryptfs_read_xattr_region(char *page_virt, struct dentry *ecryptfs_dentry)
+int ecryptfs_read_xattr_region(char *page_virt, struct inode *ecryptfs_inode)
{
+ struct dentry *lower_dentry =
+ ecryptfs_inode_to_private(ecryptfs_inode)->lower_file->f_dentry;
ssize_t size;
int rc = 0;
- size = ecryptfs_getxattr(ecryptfs_dentry, ECRYPTFS_XATTR_NAME,
- page_virt, ECRYPTFS_DEFAULT_EXTENT_SIZE);
+ size = ecryptfs_getxattr_lower(lower_dentry, ECRYPTFS_XATTR_NAME,
+ page_virt, ECRYPTFS_DEFAULT_EXTENT_SIZE);
if (size < 0) {
- printk(KERN_DEBUG "Error attempting to read the [%s] "
+ printk(KERN_ERR "Error attempting to read the [%s] "
"xattr from the lower file; return value = [%zd]\n",
ECRYPTFS_XATTR_NAME, size);
rc = -EINVAL;
{
int rc;
- rc = ecryptfs_read_xattr_region(page_virt, ecryptfs_dentry);
+ rc = ecryptfs_read_xattr_region(page_virt, ecryptfs_dentry->d_inode);
if (rc)
goto out;
if (!contains_ecryptfs_marker(page_virt + ECRYPTFS_FILE_SIZE_BYTES)) {
/**
* ecryptfs_read_metadata
- * @ecryptfs_dentry: The eCryptfs dentry
- * @lower_file: The lower file from which to read the metadata
*
* Common entry point for reading file metadata. From here, we could
* retrieve the header information from the header region of the file,
*
* Returns zero if valid headers found and parsed; non-zero otherwise
*/
-int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry,
- struct file *lower_file)
+int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry)
{
int rc = 0;
char *page_virt = NULL;
- mm_segment_t oldfs;
- ssize_t bytes_read;
+ struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode;
struct ecryptfs_crypt_stat *crypt_stat =
- &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat;
+ &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
&ecryptfs_superblock_to_private(
ecryptfs_dentry->d_sb)->mount_crypt_stat;
page_virt = kmem_cache_alloc(ecryptfs_header_cache_1, GFP_USER);
if (!page_virt) {
rc = -ENOMEM;
- ecryptfs_printk(KERN_ERR, "Unable to allocate page_virt\n");
+ printk(KERN_ERR "%s: Unable to allocate page_virt\n",
+ __FUNCTION__);
goto out;
}
- lower_file->f_pos = 0;
- oldfs = get_fs();
- set_fs(get_ds());
- bytes_read = lower_file->f_op->read(lower_file,
- (char __user *)page_virt,
- ECRYPTFS_DEFAULT_EXTENT_SIZE,
- &lower_file->f_pos);
- set_fs(oldfs);
- if (bytes_read != ECRYPTFS_DEFAULT_EXTENT_SIZE) {
- rc = -EINVAL;
- goto out;
- }
- rc = ecryptfs_read_headers_virt(page_virt, crypt_stat,
- ecryptfs_dentry,
- ECRYPTFS_VALIDATE_HEADER_SIZE);
+ rc = ecryptfs_read_lower(page_virt, 0, crypt_stat->extent_size,
+ ecryptfs_inode);
+ if (!rc)
+ rc = ecryptfs_read_headers_virt(page_virt, crypt_stat,
+ ecryptfs_dentry,
+ ECRYPTFS_VALIDATE_HEADER_SIZE);
if (rc) {
- rc = ecryptfs_read_xattr_region(page_virt,
- ecryptfs_dentry);
+ rc = ecryptfs_read_xattr_region(page_virt, ecryptfs_inode);
if (rc) {
printk(KERN_DEBUG "Valid eCryptfs headers not found in "
"file header region or xattr region\n");
* should be released by other functions, such as on a superblock put
* event, regardless of whether this function succeeds for fails.
*/
-int
+static int
ecryptfs_process_key_cipher(struct crypto_blkcipher **key_tfm,
char *cipher_name, size_t *key_size)
{
strncpy(tmp_tfm->cipher_name, cipher_name,
ECRYPTFS_MAX_CIPHER_NAME_SIZE);
tmp_tfm->key_size = key_size;
- if ((rc = ecryptfs_process_key_cipher(&tmp_tfm->key_tfm,
- tmp_tfm->cipher_name,
- &tmp_tfm->key_size))) {
+ rc = ecryptfs_process_key_cipher(&tmp_tfm->key_tfm,
+ tmp_tfm->cipher_name,
+ &tmp_tfm->key_size);
+ if (rc) {
printk(KERN_ERR "Error attempting to initialize key TFM "
"cipher with name = [%s]; rc = [%d]\n",
tmp_tfm->cipher_name, rc);
}
}
mutex_unlock(&key_tfm_list_mutex);
- if ((rc = ecryptfs_add_new_key_tfm(&key_tfm, cipher_name, 0))) {
+ rc = ecryptfs_add_new_key_tfm(&key_tfm, cipher_name, 0);
+ if (rc) {
printk(KERN_ERR "Error adding new key_tfm to list; rc = [%d]\n",
rc);
goto out;
projects / powerpc.git / blobdiff