crypto: ecdh - fix big endian bug in ECC library

BugLink: https://bugs.launchpad.net/bugs/1857158
commit f398243e9fd6a3a059c1ea7b380c40628dbf0c61 upstream.

The elliptic curve arithmetic library used by the EC-DH KPP implementation
assumes big endian byte order, and unconditionally reverses the byte
and word order of multi-limb quantities. On big endian systems, the byte
reordering is not necessary, while the word ordering needs to be retained.

So replace the __swab64() invocation with a call to be64_to_cpu() which
should do the right thing for both little and big endian builds.

Fixes: 3c4b23901a0c ("crypto: ecdh - Add ECDH software support")
Cc: <stable@vger.kernel.org> # v4.9+
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

diff --git a/crypto/ecc.c b/crypto/ecc.c
index 59bf7282d351e6f6b141debd65725e58a0bc8b25..d672b6865fd78bbe1de6f14aa3284f8918850826 100644 (file)
--- a/crypto/ecc.c
+++ b/crypto/ecc.c
@@ -898,10 +898,11 @@ static void ecc_point_mult(struct ecc_point *result,
 static inline void ecc_swap_digits(const u64 *in, u64 *out,
                                   unsigned int ndigits)
 {
+       const __be64 *src = (__force __be64 *)in;
        int i;
 
        for (i = 0; i < ndigits; i++)
-               out[i] = __swab64(in[ndigits - 1 - i]);
+               out[i] = be64_to_cpu(src[ndigits - 1 - i]);
 }
 
 static int __ecc_is_key_valid(const struct ecc_curve *curve,