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fscrypt: Let fs select encryption index/tweak

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Avoid re-use of page index as tweak for AES-XTS when multiple parts of
same page are encrypted. This will happen on multiple (partial) calls of
fscrypt_encrypt_page on same page.
page->index is only valid for writeback pages.

Signed-off-by: David Gstir <[email protected]>
Signed-off-by: Richard Weinberger <[email protected]>
Signed-off-by: Theodore Ts'o <[email protected]>
This commit is contained in:
David Gstir 2016-11-13 22:20:48 +01:00 • committed by Theodore Ts'o
commit 9c4bb8a3a9
5 changed files with 19 additions and 13 deletions
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11
fs/crypto/crypto.c
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@ -218,6 +218,8 @@ static struct page *alloc_bounce_page(struct fscrypt_ctx *ctx, gfp_t gfp_flags)
* @plaintext_page: The page to encrypt. Must be locked.
* @plaintext_len: Length of plaintext within page
* @plaintext_offset: Offset of plaintext within page
* @index: Index for encryption. This is mainly the page index, but
* but might be different for multiple calls on same page.
* @gfp_flags: The gfp flag for memory allocation
*
* Encrypts plaintext_page using the ctx encryption context. If
@ -235,7 +237,7 @@ struct page *fscrypt_encrypt_page(const struct inode *inode,
struct page *plaintext_page,
unsigned int plaintext_len,
unsigned int plaintext_offset,
gfp_t gfp_flags)
pgoff_t index, gfp_t gfp_flags)
{
struct fscrypt_ctx *ctx;
@ -256,7 +258,7 @@ struct page *fscrypt_encrypt_page(const struct inode *inode,
}
ctx->w.control_page = plaintext_page;
err = do_page_crypto(inode, FS_ENCRYPT, plaintext_page->index,
err = do_page_crypto(inode, FS_ENCRYPT, index,
plaintext_page, ciphertext_page,
plaintext_len, plaintext_offset,
gfp_flags);
@ -283,6 +285,7 @@ EXPORT_SYMBOL(fscrypt_encrypt_page);
* @page: The page to decrypt. Must be locked.
* @len: Number of bytes in @page to be decrypted.
* @offs: Start of data in @page.
* @index: Index for encryption.
*
* Decrypts page in-place using the ctx encryption context.
*
@ -291,7 +294,7 @@ EXPORT_SYMBOL(fscrypt_encrypt_page);
* Return: Zero on success, non-zero otherwise.
*/
int fscrypt_decrypt_page(const struct inode *inode, struct page *page,
unsigned int len, unsigned int offs)
unsigned int len, unsigned int offs, pgoff_t index)
{
return do_page_crypto(inode, FS_DECRYPT, page->index, page, page, len, offs,
GFP_NOFS);
@ -430,7 +433,7 @@ static void completion_pages(struct work_struct *work)
bio_for_each_segment_all(bv, bio, i) {
struct page *page = bv->bv_page;
int ret = fscrypt_decrypt_page(page->mapping->host, page,
PAGE_SIZE, 0);
PAGE_SIZE, 0, page->index);
if (ret) {
WARN_ON_ONCE(1);