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Stephan Mueller ccfe8c3f7e crypto: aesni - fix memory usage in GCM decryption 
The kernel crypto API logic requires the caller to provide the
length of (ciphertext || authentication tag) as cryptlen for the
AEAD decryption operation. Thus, the cipher implementation must
calculate the size of the plaintext output itself and cannot simply use
cryptlen.

The RFC4106 GCM decryption operation tries to overwrite cryptlen memory
in req->dst. As the destination buffer for decryption only needs to hold
the plaintext memory but cryptlen references the input buffer holding
(ciphertext || authentication tag), the assumption of the destination
buffer length in RFC4106 GCM operation leads to a too large size. This
patch simply uses the already calculated plaintext size.

In addition, this patch fixes the offset calculation of the AAD buffer
pointer: as mentioned before, cryptlen already includes the size of the
tag. Thus, the tag does not need to be added. With the addition, the AAD
will be written beyond the already allocated buffer.

Note, this fixes a kernel crash that can be triggered from user space
via AF_ALG(aead) -- simply use the libkcapi test application
from [1] and update it to use rfc4106-gcm-aes.

Using [1], the changes were tested using CAVS vectors to demonstrate
that the crypto operation still delivers the right results.

[1] http://www.chronox.de/libkcapi.html

CC: Tadeusz Struk <tadeusz.struk@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
 		2015-03-13 21:32:21 +11:00
..
sha-mb crypto: add missing crypto module aliases 2015-01-13 22:29:11 +11:00
Makefile crypto: sha-mb - Add avx2_supported check. 2015-01-05 21:35:02 +11:00
aes-i586-asm_32.S crypto: x86/aes - assembler clean-ups: use ENTRY/ENDPROC, localize jump targets 2013-01-20 10:16:47 +11:00
aes-x86_64-asm_64.S crypto: x86/aes - assembler clean-ups: use ENTRY/ENDPROC, localize jump targets 2013-01-20 10:16:47 +11:00
aes_ctrby8_avx-x86_64.S crypto: aesni - fix "by8" variant for 128 bit keys 2015-01-05 21:35:02 +11:00
aes_glue.c crypto: prefix module autoloading with "crypto-" 2014-11-24 22:43:57 +08:00
aesni-intel_asm.S crypto: aesni - Add support for 192 & 256 bit keys to AESNI RFC4106 2015-01-14 21:56:51 +11:00
aesni-intel_avx-x86_64.S crypto: aesni - fix build on x86 (32bit) 2014-01-15 11:36:34 +08:00
aesni-intel_glue.c crypto: aesni - fix memory usage in GCM decryption 2015-03-13 21:32:21 +11:00
blowfish-x86_64-asm_64.S crypto: blowfish-x86_64: use ENTRY()/ENDPROC() for assembler functions and localize jump targets 2013-01-20 10:16:48 +11:00
blowfish_glue.c crypto: prefix module autoloading with "crypto-" 2014-11-24 22:43:57 +08:00
camellia-aesni-avx-asm_64.S crypto: x86/camellia-aesni-avx - add more optimized XTS code 2013-04-25 21:01:52 +08:00
camellia-aesni-avx2-asm_64.S crypto: camellia-aesni-avx2 - tune assembly code for more performance 2013-06-21 14:44:23 +08:00
camellia-x86_64-asm_64.S crypto: camellia-x86_64/aes-ni: use ENTRY()/ENDPROC() for assembler functions and localize jump targets 2013-01-20 10:16:48 +11:00
camellia_aesni_avx2_glue.c crypto: prefix module autoloading with "crypto-" 2014-11-24 22:43:57 +08:00
camellia_aesni_avx_glue.c crypto: prefix module autoloading with "crypto-" 2014-11-24 22:43:57 +08:00
camellia_glue.c crypto: prefix module autoloading with "crypto-" 2014-11-24 22:43:57 +08:00
cast5-avx-x86_64-asm_64.S crypto: cast5-avx: use ENTRY()/ENDPROC() for assembler functions and localize jump targets 2013-01-20 10:16:48 +11:00
cast5_avx_glue.c crypto: prefix module autoloading with "crypto-" 2014-11-24 22:43:57 +08:00
cast6-avx-x86_64-asm_64.S crypto: cast6-avx: use new optimized XTS code 2013-04-25 21:01:52 +08:00
cast6_avx_glue.c crypto: prefix module autoloading with "crypto-" 2014-11-24 22:43:57 +08:00
crc32-pclmul_asm.S x86, crc32-pclmul: Fix build with older binutils 2013-05-30 16:36:23 -07:00
crc32-pclmul_glue.c crypto: prefix module autoloading with "crypto-" 2014-11-24 22:43:57 +08:00
crc32c-intel_glue.c crypto: prefix module autoloading with "crypto-" 2014-11-24 22:43:57 +08:00
crc32c-pcl-intel-asm_64.S crypto: crc32c-pclmul - Shrink K_table to 32-bit words 2014-06-20 21:27:57 +08:00
crct10dif-pcl-asm_64.S Reinstate "crypto: crct10dif - Wrap crc_t10dif function all to use crypto transform framework" 2013-09-07 12:56:26 +10:00
crct10dif-pclmul_glue.c crypto: prefix module autoloading with "crypto-" 2014-11-24 22:43:57 +08:00
des3_ede-asm_64.S crypto: des_3des - add x86-64 assembly implementation 2014-06-20 21:27:58 +08:00
des3_ede_glue.c crypto: x86/des3_ede - drop bogus module aliases 2015-01-13 22:30:52 +11:00
fpu.c crypto: include crypto- module prefix in template 2014-11-26 20:06:30 +08:00
ghash-clmulni-intel_asm.S crypto: ghash-clmulni-intel - Use u128 instead of be128 for internal key 2014-04-04 21:06:14 +08:00
ghash-clmulni-intel_glue.c crypto: prefix module autoloading with "crypto-" 2014-11-24 22:43:57 +08:00
glue_helper-asm-avx.S crypto: x86 - add more optimized XTS-mode for serpent-avx 2013-04-25 21:01:51 +08:00
glue_helper-asm-avx2.S crypto: twofish - add AVX2/x86_64 assembler implementation of twofish cipher 2013-04-25 21:09:05 +08:00
glue_helper.c crypto: x86 - add more optimized XTS-mode for serpent-avx 2013-04-25 21:01:51 +08:00
salsa20-i586-asm_32.S crypto: x86/salsa20 - assembler cleanup, use ENTRY/ENDPROC for assember functions and rename ECRYPT_* to salsa20_* 2013-01-20 10:16:50 +11:00
salsa20-x86_64-asm_64.S crypto: x86/salsa20 - assembler cleanup, use ENTRY/ENDPROC for assember functions and rename ECRYPT_* to salsa20_* 2013-01-20 10:16:50 +11:00
salsa20_glue.c crypto: prefix module autoloading with "crypto-" 2014-11-24 22:43:57 +08:00
serpent-avx-x86_64-asm_64.S crypto: x86 - add more optimized XTS-mode for serpent-avx 2013-04-25 21:01:51 +08:00
serpent-avx2-asm_64.S crypto: serpent - add AVX2/x86_64 assembler implementation of serpent cipher 2013-04-25 21:09:07 +08:00
serpent-sse2-i586-asm_32.S crypto: x86/serpent - use ENTRY/ENDPROC for assember functions and localize jump targets 2013-01-20 10:16:50 +11:00
serpent-sse2-x86_64-asm_64.S crypto: x86/serpent - use ENTRY/ENDPROC for assember functions and localize jump targets 2013-01-20 10:16:50 +11:00
serpent_avx2_glue.c crypto: prefix module autoloading with "crypto-" 2014-11-24 22:43:57 +08:00
serpent_avx_glue.c crypto: prefix module autoloading with "crypto-" 2014-11-24 22:43:57 +08:00
serpent_sse2_glue.c crypto: prefix module autoloading with "crypto-" 2014-11-24 22:43:57 +08:00
sha1_avx2_x86_64_asm.S crypto: x86/sha1 - reduce size of the AVX2 asm implementation 2014-03-25 20:25:43 +08:00
sha1_ssse3_asm.S crypto: x86/sha1 - assembler clean-ups: use ENTRY/ENDPROC 2013-01-20 10:16:51 +11:00
sha1_ssse3_glue.c crypto: prefix module autoloading with "crypto-" 2014-11-24 22:43:57 +08:00
sha256-avx-asm.S crypto: sha256_ssse3 - fix stack corruption with SSSE3 and AVX implementations 2013-05-28 13:46:47 +08:00
sha256-avx2-asm.S crypto: sha256 - Optimized sha256 x86_64 routine using AVX2's RORX instructions 2013-04-03 09:06:32 +08:00
sha256-ssse3-asm.S crypto: sha256_ssse3 - fix stack corruption with SSSE3 and AVX implementations 2013-05-28 13:46:47 +08:00
sha256_ssse3_glue.c crypto: sha - replace memset by memzero_explicit 2014-12-02 22:55:49 +08:00
sha512-avx-asm.S crypto: sha512 - Optimized SHA512 x86_64 assembly routine using AVX instructions. 2013-04-25 21:00:58 +08:00
sha512-avx2-asm.S crypto: sha512 - Optimized SHA512 x86_64 assembly routine using AVX2 RORX instruction. 2013-04-25 21:00:58 +08:00
sha512-ssse3-asm.S crypto: sha512 - Optimized SHA512 x86_64 assembly routine using Supplemental SSE3 instructions. 2013-04-25 21:00:58 +08:00
sha512_ssse3_glue.c crypto: sha - replace memset by memzero_explicit 2014-12-02 22:55:49 +08:00
twofish-avx-x86_64-asm_64.S crypto: x86/twofish-avx - use optimized XTS code 2013-04-25 21:01:51 +08:00
twofish-i586-asm_32.S crypto: x86/twofish - assembler clean-ups: use ENTRY/ENDPROC, localize jump labels 2013-01-20 10:16:51 +11:00
twofish-x86_64-asm_64-3way.S crypto: x86/twofish - assembler clean-ups: use ENTRY/ENDPROC, localize jump labels 2013-01-20 10:16:51 +11:00
twofish-x86_64-asm_64.S crypto: x86/twofish - assembler clean-ups: use ENTRY/ENDPROC, localize jump labels 2013-01-20 10:16:51 +11:00
twofish_avx_glue.c crypto: prefix module autoloading with "crypto-" 2014-11-24 22:43:57 +08:00
twofish_glue.c crypto: prefix module autoloading with "crypto-" 2014-11-24 22:43:57 +08:00
twofish_glue_3way.c crypto: prefix module autoloading with "crypto-" 2014-11-24 22:43:57 +08:00