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author | David Gstir <david@sigma-star.at> | 2016-11-13 22:20:48 +0100 |
---|---|---|
committer | Theodore Ts'o <tytso@mit.edu> | 2016-11-13 20:18:16 -0500 |
commit | 9c4bb8a3a9b4de21753053d667310c2b7cb39916 (patch) | |
tree | f384bbd76dfc293f2cc66c770c5ccfdbc42c43c8 /fs/crypto | |
parent | 0b93e1b94b86f826d18a2aaf219a53e271274d49 (diff) | |
download | op-kernel-dev-9c4bb8a3a9b4de21753053d667310c2b7cb39916.zip op-kernel-dev-9c4bb8a3a9b4de21753053d667310c2b7cb39916.tar.gz |
fscrypt: Let fs select encryption index/tweak
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 <david@sigma-star.at>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/crypto')
-rw-r--r-- | fs/crypto/crypto.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/fs/crypto/crypto.c b/fs/crypto/crypto.c index f5c5e84..b602978 100644 --- a/fs/crypto/crypto.c +++ b/fs/crypto/crypto.c @@ -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); |