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crypto: padlock - Fix AES-CBC handling on odd-block-sized input

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On certain VIA chipsets AES-CBC requires the input/output to be
a multiple of 64 bytes.  We had a workaround for this but it was
buggy as it sent the whole input for processing when it is meant
to only send the initial number of blocks which makes the rest
a multiple of 64 bytes.

As expected this causes memory corruption whenever the workaround
kicks in.

Reported-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2010-11-04 14:38:39 -04:00
parent 14bd342e25
commit c054a076a1
1 changed files with 1 additions and 1 deletions
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2
drivers/crypto/padlock-aes.c
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@ -286,7 +286,7 @@ static inline u8 *padlock_xcrypt_cbc(const u8 *input, u8 *output, void *key,
if (initial) if (initial)
asm volatile (".byte 0xf3,0x0f,0xa7,0xd0" /* rep xcryptcbc */ asm volatile (".byte 0xf3,0x0f,0xa7,0xd0" /* rep xcryptcbc */
: "+S" (input), "+D" (output), "+a" (iv) : "+S" (input), "+D" (output), "+a" (iv)
: "d" (control_word), "b" (key), "c" (count)); : "d" (control_word), "b" (key), "c" (initial));
asm volatile (".byte 0xf3,0x0f,0xa7,0xd0" /* rep xcryptcbc */ asm volatile (".byte 0xf3,0x0f,0xa7,0xd0" /* rep xcryptcbc */
: "+S" (input), "+D" (output), "+a" (iv) : "+S" (input), "+D" (output), "+a" (iv)