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crypto: vmx - fix copy-paste error in CTR mode 

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@gmail.com>
Fixes: 5c380d623e ("crypto: vmx - Add support for VMS instructions by ASM")
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Axtens <dja@axtens.net>
Tested-by: Michael Ellerman <mpe@ellerman.id.au>
Tested-by: Ondrej Mosnacek <omosnacek@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Daniel Axtens 2019-03-15 13:09:01 +11:00 committed by Herbert Xu
parent 5db46ac29a
commit dcf7b48212
1 changed files with 2 additions and 2 deletions
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4
drivers/crypto/vmx/aesp8-ppc.pl
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@ -1854,7 +1854,7 @@ 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:
@ -1866,7 +1866,7 @@ 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: