-stable review patch. If anyone has any objections, please let us know.
---------------------
From: Sebastian Siewior <[email protected]>
[ Upstream commit: 6212f2c7f70c591efb0d9f3d50ad29112392fee2 ]
The XTS blockmode uses a copy of the IV which is saved on the stack
and may or may not be properly aligned. If it is not, it will break
hardware cipher like the geode or padlock.
This patch encrypts the IV in place so we don't have to worry about
alignment.
Signed-off-by: Sebastian Siewior <[email protected]>
Tested-by: Stefan Hellermann <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
Signed-off-by: Chris Wright <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
crypto/xts.c | 13 ++++++-------
1 file changed, 6 insertions(+), 7 deletions(-)
--- a/crypto/xts.c
+++ b/crypto/xts.c
@@ -77,16 +77,16 @@ static int setkey(struct crypto_tfm *par
}
struct sinfo {
- be128 t;
+ be128 *t;
struct crypto_tfm *tfm;
void (*fn)(struct crypto_tfm *, u8 *, const u8 *);
};
static inline void xts_round(struct sinfo *s, void *dst, const void *src)
{
- be128_xor(dst, &s->t, src); /* PP <- T xor P */
+ be128_xor(dst, s->t, src); /* PP <- T xor P */
s->fn(s->tfm, dst, dst); /* CC <- E(Key1,PP) */
- be128_xor(dst, dst, &s->t); /* C <- T xor CC */
+ be128_xor(dst, dst, s->t); /* C <- T xor CC */
}
static int crypt(struct blkcipher_desc *d,
@@ -101,7 +101,6 @@ static int crypt(struct blkcipher_desc *
.tfm = crypto_cipher_tfm(ctx->child),
.fn = fn
};
- be128 *iv;
u8 *wsrc;
u8 *wdst;
@@ -109,20 +108,20 @@ static int crypt(struct blkcipher_desc *
if (!w->nbytes)
return err;
+ s.t = (be128 *)w->iv;
avail = w->nbytes;
wsrc = w->src.virt.addr;
wdst = w->dst.virt.addr;
/* calculate first value of T */
- iv = (be128 *)w->iv;
- tw(crypto_cipher_tfm(ctx->tweak), (void *)&s.t, w->iv);
+ tw(crypto_cipher_tfm(ctx->tweak), w->iv, w->iv);
goto first;
for (;;) {
do {
- gf128mul_x_ble(&s.t, &s.t);
+ gf128mul_x_ble(s.t, s.t);
first:
xts_round(&s, wdst, wsrc);
--