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author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2019-10-23 11:50:44 +0200 |
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committer | Herbert Xu <herbert@gondor.apana.org.au> | 2019-11-01 13:38:31 +0800 |
commit | 262777c0da63572461859a155024cf5c52023afb (patch) | |
tree | cc2d2373fc6fd4726902d7e6f2fb961184a222f4 /crypto/ecc.c | |
parent | 45f492d77eefc969dc6092efc2b9eb041e680b0b (diff) | |
download | linux-crypto-262777c0da63572461859a155024cf5c52023afb.tar.gz linux-crypto-262777c0da63572461859a155024cf5c52023afb.zip |
crypto: ecdh - fix big endian bug in ECC library
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: e8c7f3061131 ("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>
Diffstat (limited to 'crypto/ecc.c')
-rw-r--r-- | crypto/ecc.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/crypto/ecc.c b/crypto/ecc.c index dfe114bc..8ee78772 100644 --- a/crypto/ecc.c +++ b/crypto/ecc.c @@ -1284,10 +1284,11 @@ EXPORT_SYMBOL(ecc_point_mult_shamir); 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, |