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authorMathias Krause <minipli@googlemail.com>2012-05-30 01:43:08 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2012-05-31 20:53:22 +1000
commit7c8d51848a88aafdb68f42b6b650c83485ea2f84 (patch)
tree7d8ed09c28d44f7b66d8c81695f7af77d43d7794
parent121daad8fd1dce63076fa55aaedd5dc3f981b334 (diff)
downloadlinux-7c8d51848a88aafdb68f42b6b650c83485ea2f84.tar.bz2
crypto: aesni-intel - fix unaligned cbc decrypt for x86-32
The 32 bit variant of cbc(aes) decrypt is using instructions requiring 128 bit aligned memory locations but fails to ensure this constraint in the code. Fix this by loading the data into intermediate registers with load unaligned instructions. This fixes reported general protection faults related to aesni. References: https://bugzilla.kernel.org/show_bug.cgi?id=43223 Reported-by: Daniel <garkein@mailueberfall.de> Cc: stable@kernel.org [v2.6.39+] Signed-off-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
-rw-r--r--arch/x86/crypto/aesni-intel_asm.S6
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/x86/crypto/aesni-intel_asm.S b/arch/x86/crypto/aesni-intel_asm.S
index be6d9e365a80..3470624d7835 100644
--- a/arch/x86/crypto/aesni-intel_asm.S
+++ b/arch/x86/crypto/aesni-intel_asm.S
@@ -2460,10 +2460,12 @@ ENTRY(aesni_cbc_dec)
pxor IN3, STATE4
movaps IN4, IV
#else
- pxor (INP), STATE2
- pxor 0x10(INP), STATE3
pxor IN1, STATE4
movaps IN2, IV
+ movups (INP), IN1
+ pxor IN1, STATE2
+ movups 0x10(INP), IN2
+ pxor IN2, STATE3
#endif
movups STATE1, (OUTP)
movups STATE2, 0x10(OUTP)