diff options
| author | Daniel Axtens <dja@axtens.net> | 2019-05-15 20:24:50 +1000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-06-11 12:23:51 +0200 |
| commit | 8aae5e98fec2c403a03cd66e7c66006eac1fb649 (patch) | |
| tree | 132bb39454cc133424cae700312420dc6b0b9114 /drivers/crypto | |
| parent | 582bb52e480381a44c78dc758fe9199840ae8f92 (diff) | |
crypto: vmx - CTR: always increment IV as quadword
commit 009b30ac7444c17fae34c4f435ebce8e8e2b3250 upstream.
The kernel self-tests picked up an issue with CTR mode:
alg: skcipher: p8_aes_ctr encryption test failed (wrong result) on test vector 3, cfg="uneven misaligned splits, may sleep"
Test vector 3 has an IV of FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFD, so
after 3 increments it should wrap around to 0.
In the aesp8-ppc code from OpenSSL, there are two paths that
increment IVs: the bulk (8 at a time) path, and the individual
path which is used when there are fewer than 8 AES blocks to
process.
In the bulk path, the IV is incremented with vadduqm: "Vector
Add Unsigned Quadword Modulo", which does 128-bit addition.
In the individual path, however, the IV is incremented with
vadduwm: "Vector Add Unsigned Word Modulo", which instead
does 4 32-bit additions. Thus the IV would instead become
FFFFFFFFFFFFFFFFFFFFFFFF00000000, throwing off the result.
Use vadduqm.
This was probably a typo originally, what with q and w being
adjacent. It is a pretty narrow edge case: I am really
impressed by the quality of the kernel self-tests!
Fixes: 5c380d623ed3 ("crypto: vmx - Add support for VMS instructions by ASM")
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Axtens <dja@axtens.net>
Acked-by: Nayna Jain <nayna@linux.ibm.com>
Tested-by: Nayna Jain <nayna@linux.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/crypto')
| -rw-r--r-- | drivers/crypto/vmx/aesp8-ppc.pl | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/crypto/vmx/aesp8-ppc.pl b/drivers/crypto/vmx/aesp8-ppc.pl index c5c3e0d57e6a..4277fdd037bb 100644 --- a/drivers/crypto/vmx/aesp8-ppc.pl +++ b/drivers/crypto/vmx/aesp8-ppc.pl @@ -1298,7 +1298,7 @@ Loop_ctr32_enc: addi $idx,$idx,16 bdnz Loop_ctr32_enc - vadduwm $ivec,$ivec,$one + vadduqm $ivec,$ivec,$one vmr $dat,$inptail lvx $inptail,0,$inp addi $inp,$inp,16 |