linux-kernel - [PATCH 4.20 032/111] crypto: sm3 - fix undefined shift by >= width of value

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Message-Id: <20190121122459.361209799@linuxfoundation.org>
Date:   Mon, 21 Jan 2019 14:42:26 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Gilad Ben-Yossef <gilad@...yossef.com>,
        Eric Biggers <ebiggers@...gle.com>,
        Herbert Xu <herbert@...dor.apana.org.au>
Subject: [PATCH 4.20 032/111] crypto: sm3 - fix undefined shift by >= width of value

4.20-stable review patch.  If anyone has any objections, please let me know.

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

From: Eric Biggers <ebiggers@...gle.com>

commit d45a90cb5d061fa7d411b974b950fe0b8bc5f265 upstream.

sm3_compress() calls rol32() with shift >= 32, which causes undefined
behavior.  This is easily detected by enabling CONFIG_UBSAN.

Explicitly AND with 31 to make the behavior well defined.

Fixes: 4f0fc1600edb ("crypto: sm3 - add OSCCA SM3 secure hash")
Cc: <stable@...r.kernel.org> # v4.15+
Cc: Gilad Ben-Yossef <gilad@...yossef.com>
Signed-off-by: Eric Biggers <ebiggers@...gle.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 crypto/sm3_generic.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/crypto/sm3_generic.c
+++ b/crypto/sm3_generic.c
@@ -100,7 +100,7 @@ static void sm3_compress(u32 *w, u32 *wt
 
 	for (i = 0; i <= 63; i++) {
 
-		ss1 = rol32((rol32(a, 12) + e + rol32(t(i), i)), 7);
+		ss1 = rol32((rol32(a, 12) + e + rol32(t(i), i & 31)), 7);
 
 		ss2 = ss1 ^ rol32(a, 12);