linux-kernel - [PATCH 4.9 13/44] crypto: vmx - fix copy-paste error in CTR mode

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Message-Id: <20190520115232.605785186@linuxfoundation.org>
Date:   Mon, 20 May 2019 14:14:02 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Ondrej Mosnáček <omosnacek@...il.com>,
        Daniel Axtens <dja@...ens.net>,
        Michael Ellerman <mpe@...erman.id.au>,
        Herbert Xu <herbert@...dor.apana.org.au>
Subject: [PATCH 4.9 13/44] crypto: vmx - fix copy-paste error in CTR mode

From: Daniel Axtens <dja@...ens.net>

commit dcf7b48212c0fab7df69e84fab22d6cb7c8c0fb9 upstream.

The original assembly imported from OpenSSL has two copy-paste
errors in handling CTR mode. When dealing with a 2 or 3 block tail,
the code branches to the CBC decryption exit path, rather than to
the CTR exit path.

This leads to corruption of the IV, which leads to subsequent blocks
being corrupted.

This can be detected with libkcapi test suite, which is available at
https://github.com/smuellerDD/libkcapi

Reported-by: Ondrej Mosnáček <omosnacek@...il.com>
Fixes: 5c380d623ed3 ("crypto: vmx - Add support for VMS instructions by ASM")
Cc: stable@...r.kernel.org
Signed-off-by: Daniel Axtens <dja@...ens.net>
Tested-by: Michael Ellerman <mpe@...erman.id.au>
Tested-by: Ondrej Mosnacek <omosnacek@...il.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/crypto/vmx/aesp8-ppc.pl |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/crypto/vmx/aesp8-ppc.pl
+++ b/drivers/crypto/vmx/aesp8-ppc.pl
@@ -1815,7 +1815,7 @@ Lctr32_enc8x_three:
 	stvx_u		$out1,$x10,$out
 	stvx_u		$out2,$x20,$out
 	addi		$out,$out,0x30
-	b		Lcbc_dec8x_done
+	b		Lctr32_enc8x_done
 
 .align	5
 Lctr32_enc8x_two:
@@ -1827,7 +1827,7 @@ Lctr32_enc8x_two:
 	stvx_u		$out0,$x00,$out
 	stvx_u		$out1,$x10,$out
 	addi		$out,$out,0x20
-	b		Lcbc_dec8x_done
+	b		Lctr32_enc8x_done
 
 .align	5
 Lctr32_enc8x_one: