fscrypto: make XTS tweak initialization endian-independent

commit fb4454376df9d820d95452d71dd83da6971f9338 upstream.

The XTS tweak (or IV) was initialized differently on little endian and
big endian systems.  Because the ciphertext depends on the XTS tweak, it
was not possible to use an encrypted filesystem created by a little
endian system on a big endian system and vice versa, even if they shared
the same PAGE_SIZE.  Fix this by always using little endian.

This will break hypothetical big endian users of ext4 or f2fs
encryption.  However, all users we are aware of are little endian, and
it's believed that "real" big endian users are unlikely to exist yet.
So this might as well be fixed now before it's too late.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/crypto/crypto.c b/fs/crypto/crypto.c
index c502c116924ca1bd603184089bff67be8f5100a5..55d64fba1e87d141ff9fd748554e6b2480828117 100644 (file)
--- a/fs/crypto/crypto.c
+++ b/fs/crypto/crypto.c
@@ -152,7 +152,10 @@ static int do_page_crypto(struct inode *inode,
                        struct page *src_page, struct page *dest_page,
                        gfp_t gfp_flags)
 {
-       u8 xts_tweak[FS_XTS_TWEAK_SIZE];
+       struct {
+               __le64 index;
+               u8 padding[FS_XTS_TWEAK_SIZE - sizeof(__le64)];
+       } xts_tweak;
        struct skcipher_request *req = NULL;
        DECLARE_FS_COMPLETION_RESULT(ecr);
        struct scatterlist dst, src;
@@ -172,17 +175,15 @@ static int do_page_crypto(struct inode *inode,
                req, CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP,
                fscrypt_complete, &ecr);
 
-       BUILD_BUG_ON(FS_XTS_TWEAK_SIZE < sizeof(index));
-       memcpy(xts_tweak, &index, sizeof(index));
-       memset(&xts_tweak[sizeof(index)], 0,
-                       FS_XTS_TWEAK_SIZE - sizeof(index));
+       BUILD_BUG_ON(sizeof(xts_tweak) != FS_XTS_TWEAK_SIZE);
+       xts_tweak.index = cpu_to_le64(index);
+       memset(xts_tweak.padding, 0, sizeof(xts_tweak.padding));
 
        sg_init_table(&dst, 1);
        sg_set_page(&dst, dest_page, PAGE_SIZE, 0);
        sg_init_table(&src, 1);
        sg_set_page(&src, src_page, PAGE_SIZE, 0);
-       skcipher_request_set_crypt(req, &src, &dst, PAGE_SIZE,
-                                       xts_tweak);
+       skcipher_request_set_crypt(req, &src, &dst, PAGE_SIZE, &xts_tweak);
        if (rw == FS_DECRYPT)
                res = crypto_skcipher_decrypt(req);
        else