crypto: restrict usage of helper ciphers

Hi,

Based on the discussion in the thread [1], a flag is added to the kernel crypto API to allow ciphers to be marked as internal.

The patch set is tested in FIPS and non-FIPS mode. In addition, the enforcement that the helper cipher of __driver-gcm-aes-aesni cannot be loaded, but the wrapper of rfc4106-gcm-aesni can be used is tested to demonstrate that the patch works. The testing also shows that of__driver-gcm-aes-aesni is subject to the testmgr self test an can therefore be used in FIPS mode.

All cipher implementation whose definition has a cra_priority of 0 as well as the ciphers that are wrapped by cryptd and mcryptd are marked as internal ciphers to prevent them from being called by users.

The testing also includes the invocation of normal crypto operations from user space via AF_ALG and libkcapi showing that all of them work unaffected.

[1] http://comments.gmane.org/gmane.linux.kernel.cryptoapi/13705

Changes v2:
* Overhaul enforcement of the internal flag as suggested by Herbert:
a cipher marked as internal can only be invoked if the caller instantiates it with the internal flag set in the type and mask field.
* The overhaul implies that cryptd and mcryptd instances are marked as internal if the underlying cipher is marked as internal.
* The overhaul implies that the testmgr must try to allocate a cipher again with the internal flag in case the first allocation failed with -ENOENT.
* Mark internal cipher in arch/x86/crypto/sha-mb/sha1_mb.c.

Changes v3:
* Allow a caller to specify type & CRYPTO_ALG_INTERNAL and !(mask & CRYPTO_ALG_INTERNAL) when caller requests a cipher and does not care whether it is marked as internal or not (suggested by Herbert Xu)

Stephan Mueller (20):
crypto: prevent helper ciphers from being used
crypto: testmgr to use CRYPTO_ALG_INTERNAL
crypto: cryptd to process CRYPTO_ALG_INTERNAL
crypto: /proc/crypto: identify internal ciphers
crypto: mark AES-NI helper ciphers
crypto: mark ghash clmulni helper ciphers
crypto: mark GHASH ARMv8 vmull.p64 helper ciphers
crypto: mark AES-NI Camellia helper ciphers
crypto: mark CAST5 helper ciphers
crypto: mark AVX Camellia helper ciphers
crypto: mark CAST6 helper ciphers
crypto: mark Serpent AVX2 helper ciphers
crypto: mark Serpent AVX helper ciphers
crypto: mark Serpent SSE2 helper ciphers
crypto: mark Twofish AVX helper ciphers
crypto: mark NEON bit sliced AES helper ciphers
crypto: mark ARMv8 AES helper ciphers
crypto: mark 64 bit ARMv8 AES helper ciphers
crypto: mcryptd to process CRYPTO_ALG_INTERNAL
crypto: mark Multi buffer SHA1 helper cipher

 arch/arm/crypto/aes-ce-glue.c              | 12 +++++---
 arch/arm/crypto/aesbs-glue.c               |  9 ++++--
 arch/arm/crypto/ghash-ce-glue.c            |  6 ++--
 arch/arm64/crypto/aes-glue.c               | 12 +++++---
 arch/x86/crypto/aesni-intel_glue.c         | 23 +++++++++-----
 arch/x86/crypto/camellia_aesni_avx2_glue.c | 15 ++++++---
 arch/x86/crypto/camellia_aesni_avx_glue.c  | 15 ++++++---
 arch/x86/crypto/cast5_avx_glue.c           |  9 ++++--
 arch/x86/crypto/cast6_avx_glue.c           | 15 ++++++---
 arch/x86/crypto/ghash-clmulni-intel_glue.c |  7 +++--
 arch/x86/crypto/serpent_avx2_glue.c        | 15 ++++++---
 arch/x86/crypto/serpent_avx_glue.c         | 15 ++++++---
 arch/x86/crypto/serpent_sse2_glue.c        | 15 ++++++---
 arch/x86/crypto/sha-mb/sha1_mb.c           |  7 +++--
 arch/x86/crypto/twofish_avx_glue.c         | 15 ++++++---
 crypto/ablk_helper.c                       |  3 +-
 crypto/api.c                               | 10 ++++++
 crypto/cryptd.c                            | 49 +++++++++++++++++++++++++-----
 crypto/mcryptd.c                           | 25 +++++++++++++--
 crypto/proc.c                              |  3 ++
 crypto/testmgr.c                           | 14 ++++-----
 include/linux/crypto.h                     |  6 ++++
 22 files changed, 219 insertions(+), 81 deletions(-)

2.1.0