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    Subject[PATCH 4.18 138/145] crypto: arm64/sm4-ce - check for the right CPU feature bit
    Date
    4.18-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Ard Biesheuvel <ard.biesheuvel@linaro.org>

    commit 7fa885e2a22fd0f91a2c23d9275f5021f618ff5a upstream.

    ARMv8.2 specifies special instructions for the SM3 cryptographic hash
    and the SM4 symmetric cipher. While it is unlikely that a core would
    implement one and not the other, we should only use SM4 instructions
    if the SM4 CPU feature bit is set, and we currently check the SM3
    feature bit instead. So fix that.

    Fixes: e99ce921c468 ("crypto: arm64 - add support for SM4...")
    Cc: <stable@vger.kernel.org>
    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>

    ---
    arch/arm64/crypto/sm4-ce-glue.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/arch/arm64/crypto/sm4-ce-glue.c
    +++ b/arch/arm64/crypto/sm4-ce-glue.c
    @@ -69,5 +69,5 @@ static void __exit sm4_ce_mod_fini(void)
    crypto_unregister_alg(&sm4_ce_alg);
    }

    -module_cpu_feature_match(SM3, sm4_ce_mod_init);
    +module_cpu_feature_match(SM4, sm4_ce_mod_init);
    module_exit(sm4_ce_mod_fini);

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