crypto: sha1-ssse3 - Disable avx2

It has been reported that sha1-avx2 can cause page faults by reading
beyond the end of the input.  This patch disables it until it can be
fixed.

Cc: <stable@vger.kernel.org>
Fixes: 7c1da8d0d046 ("crypto: sha - SHA1 transform x86_64 AVX2")
Reported-by: Jan Stancek <jstancek@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/arch/x86/crypto/sha1_ssse3_glue.c b/arch/x86/crypto/sha1_ssse3_glue.c
index fc61739150e7c2c5a484c020b14441551fe5403a..f960a043cdeba4a36f4ba20fddf81369f8ced38f 100644 (file)
--- a/arch/x86/crypto/sha1_ssse3_glue.c
+++ b/arch/x86/crypto/sha1_ssse3_glue.c
@@ -201,7 +201,7 @@ asmlinkage void sha1_transform_avx2(u32 *digest, const char *data,
 
 static bool avx2_usable(void)
 {
-       if (avx_usable() && boot_cpu_has(X86_FEATURE_AVX2)
+       if (false && avx_usable() && boot_cpu_has(X86_FEATURE_AVX2)
                && boot_cpu_has(X86_FEATURE_BMI1)
                && boot_cpu_has(X86_FEATURE_BMI2))
                return true;