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| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2019-10-23 11:50:44 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2019-11-01 13:38:31 +0800 |
| commit | f398243e9fd6a3a059c1ea7b380c40628dbf0c61 (patch) | |
| tree | 7fbad1852deba37b65ae8453f7566828d3affbce | |
| parent | 51d13aaf59779ff4d13f1def2c72ae102a1aad40 (diff) | |
| download | linux-f398243e9fd6a3a059c1ea7b380c40628dbf0c61.tar.gz linux-f398243e9fd6a3a059c1ea7b380c40628dbf0c61.tar.bz2 linux-f398243e9fd6a3a059c1ea7b380c40628dbf0c61.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: 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>
| -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 dfe114bc0c4a..8ee787723c5c 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, |