Commit Graph

1317 Commits

Author SHA1 Message Date
Cristian Stoica 5be4d4c94b crypto: replace scatterwalk_sg_next with sg_next
Modify crypto drivers to use the generic SG helper since
both of them are equivalent and the one from crypto is redundant.

See also:
  468577abe3   reverted in
  b2ab4a57b0

Signed-off-by: Cristian Stoica <cristian.stoica@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2015-01-26 11:34:22 +11:00
Herbert Xu c0ecf8916d crypto: seqiv - Ensure that IV size is at least 8 bytes
Since seqiv is designed for IPsec we need to be able to accomodate
the whole IPsec sequence number in order to ensure the uniqueness
of the IV.

This patch forbids any algorithm with an IV size of less than 8
from using it.  This should have no impact on existing users since
they all have an IV size of 8.

Reported-by: Maciej ?enczykowski <zenczykowski@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Maciej ?enczykowski <zenczykowski@gmail.com>
2015-01-20 14:44:16 +11:00
Herbert Xu 988dc01744 crypto: cts - Weed out non-CBC algorithms
The cts algorithm as currently implemented assumes the underlying
is a CBC-mode algorithm.  So this patch adds a check for that to
eliminate bogus combinations of cts with non-CBC modes.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2015-01-20 14:44:15 +11:00
Herbert Xu 0c5c8e646c crypto: cts - Remove bogus use of seqiv
The seqiv generator is completely inappropriate for cts as it's
designed for IPsec algorithms.  Since cts users do not actually
use the IV generator we can just fall back to the default.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Maciej ?enczykowski <zenczykowski@gmail.com>
2015-01-20 14:44:15 +11:00
Wei Yongjun 598de36952 crypto: algif_rng - fix sparse non static symbol warning
Fixes the following sparse warnings:

crypto/algif_rng.c:185:13: warning:
 symbol 'rng_exit' was not declared. Should it be static?

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: Stephan Mueller <smueller@chronox.de>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2015-01-14 21:57:57 +11:00
Rabin Vincent 8a45ac12ec crypto: testmgr - don't use interruptible wait in tests
tcrypt/testmgr uses wait_for_completion_interruptible() everywhere when
it waits for a request to be completed.  If it's interrupted, then the
test is aborted and the request is freed.

However, if any of these calls actually do get interrupted, the result
will likely be a kernel crash, when the driver handles the now-freed
request.  Use wait_for_completion() instead.

Signed-off-by: Rabin Vincent <rabin.vincent@axis.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2015-01-13 22:30:44 +11:00
Herbert Xu 1471f09f9b Revert "crypto: drbg - use memzero_explicit() for clearing sensitive data"
This reverts commit 421d82f5b3.

None of the data zeroed are on the stack so the compiler cannot
optimise them away.
    
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2015-01-05 10:44:09 +11:00
Stephan Mueller 2f3755381d crypto: algif_rng - enable RNG interface compilation
Enable compilation of the RNG AF_ALG support and provide a Kconfig
option to compile the RNG AF_ALG support.

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-12-29 21:39:27 +11:00
Stephan Mueller 5afdfd22e6 crypto: algif_rng - add random number generator support
This patch adds the random number generator support for AF_ALG.

A random number generator's purpose is to generate data without
requiring the caller to provide any data. Therefore, the AF_ALG
interface handler for RNGs only implements a callback handler for
recvmsg.

The following parameters provided with a recvmsg are processed by the
RNG callback handler:

	* sock - to resolve the RNG context data structure accessing the
	  RNG instance private to the socket

	* len - this parameter allows userspace callers to specify how
	  many random bytes the RNG shall produce and return. As the
	  kernel context for the RNG allocates a buffer of 128 bytes to
	  store random numbers before copying them to userspace, the len
	  parameter is checked that it is not larger than 128. If a
	  caller wants more random numbers, a new request for recvmsg
	  shall be made.

The size of 128 bytes is chose because of the following considerations:

	* to increase the memory footprint of the kernel too much (note,
	  that would be 128 bytes per open socket)

	* 128 is divisible by any typical cryptographic block size an
	  RNG may have

	* A request for random numbers typically only shall supply small
	  amount of data like for keys or IVs that should only require
	  one invocation of the recvmsg function.

Note, during instantiation of the RNG, the code checks whether the RNG
implementation requires seeding. If so, the RNG is seeded with output
from get_random_bytes.

A fully working example using all aspects of the RNG interface is
provided at http://www.chronox.de/libkcapi.html

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-12-29 21:37:59 +11:00
Stephan Mueller ad202c8c15 crypto: af_alg - zeroize key data
alg_setkey should zeroize the sensitive data after use.

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-12-26 08:33:36 +11:00
Aaro Koskinen d69e75deff crypto: octeon - enable OCTEON MD5 module selection
Enable user to select OCTEON MD5 module.

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-12-24 08:14:24 +11:00
Tadeusz Struk 0f477b655a crypto: algif - Mark sgl end at the end of data
algif_skcipher sends 127 sgl buffers for encryption regardless of how
many buffers acctually have data to process, where the few first with
valid len and the rest with zero len. This is not very eficient.
This patch marks the last one with data as the last one to process.

Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-12-22 23:02:41 +11:00
Stephan Mueller 25fb8638e9 crypto: af_alg - add setsockopt for auth tag size
Use setsockopt on the tfm FD to provide the authentication tag size for
an AEAD cipher. This is achieved by adding a callback function which is
intended to be used by the AEAD AF_ALG implementation.

The optlen argument of the setsockopt specifies the authentication tag
size to be used with the AEAD tfm.

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-12-22 23:02:37 +11:00
Stephan Mueller 905b42e559 crypto: drbg - panic on continuous self test error
This patch adds a panic if the FIPS 140-2 self test error failed.
Note, that entire code is only executed with fips_enabled (i.e. when the
kernel is booted with fips=1. It is therefore not executed for 99.9% of
all user base.

As mathematically such failure cannot occur, this panic should never be
triggered. But to comply with NISTs current requirements, an endless
loop must be replaced with the panic.

When the new version of FIPS 140 will be released, this entire
continuous self test function will be ripped out as it will not be
needed any more.

This patch is functionally equivalent as implemented in ansi_cprng.c and drivers/char/random.c.

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-12-22 23:02:37 +11:00
Joshua I. James 0efcb8d5b2 crypto: api - fixed style erro in algapi.c
Fixed style error identified by checkpatch.

WARNING: Missing a blank line after declarations
+               int err = crypto_remove_alg(&inst->alg, &users);
+               BUG_ON(err);

Signed-off-by: Joshua I. James <joshua@cybercrimetech.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-12-22 23:02:37 +11:00
Joshua I. James b516d51402 crypto: ahash - fixed style error in ahash.c
Fixed style error identified by checkpatch.

WARNING: Missing a blank line after declarations
+               unsigned int unaligned = alignmask + 1 - (offset & alignmask);
+               if (nbytes > unaligned)

Signed-off-by: Joshua I. James <joshua@cybercrimetech.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-12-22 23:02:36 +11:00
Joshua I. James 267c4221ff crypto: af_alg - fixed style error in af_alg.c
Fixed style error identified by checkpatch.

ERROR: space required before the open parenthesis '('
+               switch(cmsg->cmsg_type) {

Signed-off-by: Joshua I. James <joshua@cybercrimetech.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-12-22 23:02:36 +11:00
Joshua I. James 4fad478ae0 crypto: aead - fixed style error in aead.c
Fixed style error identified by checkpatch.

ERROR: do not use assignment in if condition
+       if ((err = crypto_register_instance(tmpl, inst))) {

Signed-off-by: Joshua I. James <joshua@cybercrimetech.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-12-22 23:02:35 +11:00
Joshua I. James a861afbc93 crypto: ablkcipher - fixed style errors in ablkcipher.c
Fixed style errors reported by checkpatch.

WARNING: Missing a blank line after declarations
+       u8 *end_page = (u8 *)(((unsigned long)(start + len - 1)) & PAGE_MASK);
+       return max(start, end_page);

WARNING: line over 80 characters
+               scatterwalk_start(&walk->out, scatterwalk_sg_next(walk->out.sg));

WARNING: Missing a blank line after declarations
+               int err = ablkcipher_copy_iv(walk, tfm, alignmask);
+               if (err)

ERROR: do not use assignment in if condition
+       if ((err = crypto_register_instance(tmpl, inst))) {

Signed-off-by: Joshua I. James <joshua@cybercrimetech.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-12-22 23:02:35 +11:00
Rabin Vincent 7e77bdebff crypto: af_alg - fix backlog handling
If a request is backlogged, it's complete() handler will get called
twice: once with -EINPROGRESS, and once with the final error code.

af_alg's complete handler, unlike other users, does not handle the
-EINPROGRESS but instead always completes the completion that recvmsg()
is waiting on.  This can lead to a return to user space while the
request is still pending in the driver.  If userspace closes the sockets
before the requests are handled by the driver, this will lead to
use-after-frees (and potential crashes) in the kernel due to the tfm
having been freed.

The crashes can be easily reproduced (for example) by reducing the max
queue length in cryptod.c and running the following (from
http://www.chronox.de/libkcapi.html) on AES-NI capable hardware:

 $ while true; do kcapi -x 1 -e -c '__ecb-aes-aesni' \
    -k 00000000000000000000000000000000 \
    -p 00000000000000000000000000000000 >/dev/null & done

Cc: stable@vger.kernel.org
Signed-off-by: Rabin Vincent <rabin.vincent@axis.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-12-22 22:53:55 +11:00
Linus Torvalds e3aa91a7cb Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
Pull crypto update from Herbert Xu:
 - The crypto API is now documented :)
 - Disallow arbitrary module loading through crypto API.
 - Allow get request with empty driver name through crypto_user.
 - Allow speed testing of arbitrary hash functions.
 - Add caam support for ctr(aes), gcm(aes) and their derivatives.
 - nx now supports concurrent hashing properly.
 - Add sahara support for SHA1/256.
 - Add ARM64 version of CRC32.
 - Misc fixes.

* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (77 commits)
  crypto: tcrypt - Allow speed testing of arbitrary hash functions
  crypto: af_alg - add user space interface for AEAD
  crypto: qat - fix problem with coalescing enable logic
  crypto: sahara - add support for SHA1/256
  crypto: sahara - replace tasklets with kthread
  crypto: sahara - add support for i.MX53
  crypto: sahara - fix spinlock initialization
  crypto: arm - replace memset by memzero_explicit
  crypto: powerpc - replace memset by memzero_explicit
  crypto: sha - replace memset by memzero_explicit
  crypto: sparc - replace memset by memzero_explicit
  crypto: algif_skcipher - initialize upon init request
  crypto: algif_skcipher - removed unneeded code
  crypto: algif_skcipher - Fixed blocking recvmsg
  crypto: drbg - use memzero_explicit() for clearing sensitive data
  crypto: drbg - use MODULE_ALIAS_CRYPTO
  crypto: include crypto- module prefix in template
  crypto: user - add MODULE_ALIAS
  crypto: sha-mb - remove a bogus NULL check
  crytpo: qat - Fix 64 bytes requests
  ...
2014-12-13 13:33:26 -08:00
Gu Zheng f95b414edb net: introduce helper macro for_each_cmsghdr
Introduce helper macro for_each_cmsghdr as a wrapper of the enumerating
cmsghdr from msghdr, just cleanup.

Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-12-10 22:41:55 -05:00
Al Viro c0371da604 put iov_iter into msghdr
Note that the code _using_ ->msg_iter at that point will be very
unhappy with anything other than unshifted iovec-backed iov_iter.
We still need to convert users to proper primitives.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-12-09 16:29:03 -05:00
Herbert Xu 8606813a6c crypto: tcrypt - Allow speed testing of arbitrary hash functions
This patch allows the testing of arbitrary hash functions specified
by the alg module parameter by using them in mode 300 (for sync hash)
and mode 400 (for async hash).

For example, you could do
	modprobe tcrypt mode=300 alg='vmac(aes)'

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-12-05 23:57:47 +08:00
Stephan Mueller af8e80731a crypto: af_alg - add user space interface for AEAD
AEAD requires the caller to specify the following information separate
from the data stream. This information allows the AEAD interface handler
to identify the AAD, ciphertext/plaintext and the authentication tag:

        * Associated authentication data of arbitrary length and
          length

        * Length of authentication tag for encryption

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-12-05 23:56:55 +08:00
Stephan Mueller f26b7b8052 crypto: algif_skcipher - initialize upon init request
When using the algif_skcipher, the following call sequence causess a
re-initialization:

1. sendmsg with ALG_SET_OP and iov == NULL, iovlen == 0 (i.e
initializing the cipher, but not sending data)

2. sendmsg with msg->msg-controllen == 0 and iov != NULL (using the initalized
cipher handle by sending data)

In step 2, the cipher operation type (encryption or decryption) is reset
to always decryption, because the local variable of enc is put into
ctx->enc as ctx->user is still zero.

The same applies when all send data is processed and ctx->used falls to
zero followed by user space to send new data.

This patch changes the behavior to only reset the cipher operation type
(and the IV) if such configuration request is received.

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-12-02 22:55:46 +08:00
Struk, Tadeusz 9ba0905f17 crypto: algif_skcipher - removed unneeded code
Remover unneeded code.

Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-12-01 22:42:48 +08:00
Herbert Xu 1e104f9a25 crypto: algif_skcipher - Fixed blocking recvmsg
As most (all?) users of algif_skcipher are single-threaded and
therefore always write before reading from an algif_skcipher
socket, they never block and exercise that code-path.

It turns out that code path doesn't even work because we never
reload ctx->used after waking up so we never even see the new
data and immediately return an error (and a loud WARN_ON).

This patch fixes this by always reloading ctx->used.

Reported-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Stephan Mueller <smueller@chronox.de>
2014-11-28 23:33:18 +08:00
Nickolaus Woodruff 421d82f5b3 crypto: drbg - use memzero_explicit() for clearing sensitive data
Compiler dead store optimization can sometimes remove final calls
to memset() used to clear sensitive data at the end of a function.
Replace trailing memset() calls with memzero_explicit() to
preclude unwanted removal.

Signed-off-by: Nickolaus Woodruff <nickolauswoodruff@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-11-27 22:26:18 +08:00
Stephan Mueller 0653a7cf6f crypto: drbg - use MODULE_ALIAS_CRYPTO
Use the crypto- prefix for the DRBG implementations.

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-11-26 20:06:30 +08:00
Kees Cook 4943ba16bb crypto: include crypto- module prefix in template
This adds the module loading prefix "crypto-" to the template lookup
as well.

For example, attempting to load 'vfat(blowfish)' via AF_ALG now correctly
includes the "crypto-" prefix at every level, correctly rejecting "vfat":

	net-pf-38
	algif-hash
	crypto-vfat(blowfish)
	crypto-vfat(blowfish)-all
	crypto-vfat

Reported-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-11-26 20:06:30 +08:00
Stephan Mueller 476c7fe20f crypto: user - add MODULE_ALIAS
To allow automatic loading of the crypto_user kernel module, the netlink
MODULE_ALIAS is added.

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-11-26 20:06:29 +08:00
Daniel Borkmann 79e886599e crypto: algif - add and use sock_kzfree_s() instead of memzero_explicit()
Commit e1bd95bf7c ("crypto: algif - zeroize IV buffer") and
2a6af25bef ("crypto: algif - zeroize message digest buffer")
added memzero_explicit() calls on buffers that are later on
passed back to sock_kfree_s().

This is a discussed follow-up that, instead, extends the sock
API and adds sock_kzfree_s(), which internally uses kzfree()
instead of kfree() for passing the buffers back to slab.

Having sock_kzfree_s() allows to keep the changes more minimal
by just having a drop-in replacement instead of adding
memzero_explicit() calls everywhere before sock_kfree_s().

In kzfree(), the compiler is not allowed to optimize the memset()
away and thus there's no need for memzero_explicit(). Both,
sock_kfree_s() and sock_kzfree_s() are wrappers for
__sock_kfree_s() and call into kfree() resp. kzfree(); here,
__sock_kfree_s() needs to be explicitly inlined as we want the
compiler to optimize the call and condition away and thus it
produces e.g. on x86_64 the _same_ assembler output for
sock_kfree_s() before and after, and thus also allows for
avoiding code duplication.

Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-11-25 22:50:39 +08:00
Kees Cook 5d26a105b5 crypto: prefix module autoloading with "crypto-"
This prefixes all crypto module loading with "crypto-" so we never run
the risk of exposing module auto-loading to userspace via a crypto API,
as demonstrated by Mathias Krause:

https://lkml.org/lkml/2013/3/4/70

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-11-24 22:43:57 +08:00
Herbert Xu 5d4a5e770d crypto: user - Allow get request with empty driver name
Currently all get requests with an empty driver name fail with
EINVAL.  Since most users actually want to supply an empty driver
name this patch removes this check.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-11-24 22:41:52 +08:00
Al Viro 7eab8d9e8a new helper: memcpy_to_msg()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-11-24 04:28:51 -05:00
Al Viro 6ce8e9ce59 new helper: memcpy_from_msg()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-11-24 04:28:48 -05:00
Stephan Mueller e1bd95bf7c crypto: algif - zeroize IV buffer
Zeroize the buffer holding the IV used for the completed
cipher operation before the buffer is released by the
skcipher AF_ALG interface handler.

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-11-12 22:14:31 +08:00
Stephan Mueller 2a6af25bef crypto: algif - zeroize message digest buffer
Zeroize the buffer holding the message digest calculated for the
consumer before the buffer is released by the hash AF_ALG interface
handler.

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-11-12 22:14:31 +08:00
Herbert Xu 4c7912e919 Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux
Merging 3.18-rc4 in order to pick up the memzero_explicit helper.
2014-11-12 22:11:15 +08:00
Stephan Mueller 62b62b6e5c crypto: drbg - add MODULE_ALIAS for all DRBG types
The kernel module drbg.ko is currently not loaded automatically when a
DRBG is requested by a consumer. This is due to missing MODULE_ALIAS
flags for each of the implemented DRBG types.

This patch adds aliases for each of the 22 defined DRBGs.

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-11-10 22:09:00 +08:00
Linus Torvalds 14d4cc0883 This adds a memzero_explicit() call which is guaranteed not to be
optimized away by GCC.  This is important when we are wiping
 cryptographically sensitive material.
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Merge tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random

Pull /dev/random updates from Ted Ts'o:
 "This adds a memzero_explicit() call which is guaranteed not to be
  optimized away by GCC.  This is important when we are wiping
  cryptographically sensitive material"

* tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random:
  crypto: memzero_explicit - make sure to clear out sensitive data
  random: add and use memzero_explicit() for clearing data
2014-10-24 12:33:32 -07:00
Stephan Mueller 41a84982a1 crypto: drbg - use crypto_inc
The DRBG internal buffer addition function is replaced with crypto_inc when
a buffer is to be incremented by one.

The function drbg_add_buf is moved to the CONFIG_CRYPTO_DRBG_HASH ifdef
area as it is now only needed for the Hash DRBG.

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-10-24 22:49:36 +08:00
Masanari Iida 3e8cffd431 crypto: testmgr - Remove unnecessary KERN_INFO from testmgr.c
This patch remove unncessary KERN_INFO from pr_info within testmgr.c

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-10-24 22:49:36 +08:00
Daniel Borkmann 7185ad2672 crypto: memzero_explicit - make sure to clear out sensitive data
Recently, in commit 13aa93c70e71 ("random: add and use memzero_explicit()
for clearing data"), we have found that GCC may optimize some memset()
cases away when it detects a stack variable is not being used anymore
and going out of scope. This can happen, for example, in cases when we
are clearing out sensitive information such as keying material or any
e.g. intermediate results from crypto computations, etc.

With the help of Coccinelle, we can figure out and fix such occurences
in the crypto subsytem as well. Julia Lawall provided the following
Coccinelle program:

  @@
  type T;
  identifier x;
  @@

  T x;
  ... when exists
      when any
  -memset
  +memzero_explicit
     (&x,
  -0,
     ...)
  ... when != x
      when strict

  @@
  type T;
  identifier x;
  @@

  T x[...];
  ... when exists
      when any
  -memset
  +memzero_explicit
     (x,
  -0,
     ...)
  ... when != x
      when strict

Therefore, make use of the drop-in replacement memzero_explicit() for
exactly such cases instead of using memset().

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Cc: Julia Lawall <julia.lawall@lip6.fr>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2014-10-17 11:44:07 -04:00
Jan-Simon Möller 4c5c302494 crypto: LLVMLinux: Remove VLAIS usage from crypto/testmgr.c
Replaced the use of a Variable Length Array In Struct (VLAIS) with a C99
compliant equivalent. This patch allocates the appropriate amount of memory
using a char array using the SHASH_DESC_ON_STACK macro.

The new code can be compiled with both gcc and clang.

Signed-off-by: Jan-Simon Möller <dl9pf@gmx.de>
Signed-off-by: Behan Webster <behanw@converseincode.com>
Reviewed-by: Mark Charlebois <charlebm@gmail.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Cc: pageexec@freemail.hu
2014-10-14 10:51:24 +02:00
Jan-Simon Möller ffb32e973e crypto: LLVMLinux: Remove VLAIS usage from crypto/hmac.c
Replaced the use of a Variable Length Array In Struct (VLAIS) with a C99
compliant equivalent. This patch allocates the appropriate amount of memory
using a char array using the SHASH_DESC_ON_STACK macro.

The new code can be compiled with both gcc and clang.

Signed-off-by: Jan-Simon Möller <dl9pf@gmx.de>
Signed-off-by: Behan Webster <behanw@converseincode.com>
Reviewed-by: Mark Charlebois <charlebm@gmail.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Cc: pageexec@freemail.hu
2014-10-14 10:51:23 +02:00
Linus Torvalds 5e40d331bd Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security
Pull security subsystem updates from James Morris.

Mostly ima, selinux, smack and key handling updates.

* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security: (65 commits)
  integrity: do zero padding of the key id
  KEYS: output last portion of fingerprint in /proc/keys
  KEYS: strip 'id:' from ca_keyid
  KEYS: use swapped SKID for performing partial matching
  KEYS: Restore partial ID matching functionality for asymmetric keys
  X.509: If available, use the raw subjKeyId to form the key description
  KEYS: handle error code encoded in pointer
  selinux: normalize audit log formatting
  selinux: cleanup error reporting in selinux_nlmsg_perm()
  KEYS: Check hex2bin()'s return when generating an asymmetric key ID
  ima: detect violations for mmaped files
  ima: fix race condition on ima_rdwr_violation_check and process_measurement
  ima: added ima_policy_flag variable
  ima: return an error code from ima_add_boot_aggregate()
  ima: provide 'ima_appraise=log' kernel option
  ima: move keyring initialization to ima_init()
  PKCS#7: Handle PKCS#7 messages that contain no X.509 certs
  PKCS#7: Better handling of unsupported crypto
  KEYS: Overhaul key identification when searching for asymmetric keys
  KEYS: Implement binary asymmetric key ID handling
  ...
2014-10-12 10:13:55 -04:00
Linus Torvalds 87d7bcee4f Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
Pull crypto update from Herbert Xu:
 - add multibuffer infrastructure (single_task_running scheduler helper,
   OKed by Peter on lkml.
 - add SHA1 multibuffer implementation for AVX2.
 - reenable "by8" AVX CTR optimisation after fixing counter overflow.
 - add APM X-Gene SoC RNG support.
 - SHA256/SHA512 now handles unaligned input correctly.
 - set lz4 decompressed length correctly.
 - fix algif socket buffer allocation failure for 64K page machines.
 - misc fixes

* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (47 commits)
  crypto: sha - Handle unaligned input data in generic sha256 and sha512.
  Revert "crypto: aesni - disable "by8" AVX CTR optimization"
  crypto: aesni - remove unused defines in "by8" variant
  crypto: aesni - fix counter overflow handling in "by8" variant
  hwrng: printk replacement
  crypto: qat - Removed unneeded partial state
  crypto: qat - Fix typo in name of tasklet_struct
  crypto: caam - Dynamic allocation of addresses for various memory blocks in CAAM.
  crypto: mcryptd - Fix typos in CRYPTO_MCRYPTD description
  crypto: algif - avoid excessive use of socket buffer in skcipher
  arm64: dts: add random number generator dts node to APM X-Gene platform.
  Documentation: rng: Add X-Gene SoC RNG driver documentation
  hwrng: xgene - add support for APM X-Gene SoC RNG support
  crypto: mv_cesa - Add missing #define
  crypto: testmgr - add test for lz4 and lz4hc
  crypto: lz4,lz4hc - fix decompression
  crypto: qat - Use pci_enable_msix_exact() instead of pci_enable_msix()
  crypto: drbg - fix maximum value checks on 32 bit systems
  crypto: drbg - fix sparse warning for cpu_to_be[32|64]
  crypto: sha-mb - sha1_mb_alg_state can be static
  ...
2014-10-08 06:44:48 -04:00
Linus Torvalds 536fd93d43 Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm
Pull ARM updates from Russell King:
 "Included in these updates are:
   - Performance optimisation to avoid writing the control register at
     every exception.
   - Use static inline instead of extern inline in ftrace code.
   - Crypto ARM assembly updates for big endian
   - Alignment of initrd/.init memory to page sizes when freeing to
     ensure that we fully free the regions
   - Add gcov support
   - A couple of preparatory patches for VDSO support: use
     _install_special_mapping, and randomize the sigpage placement above
     stack.
   - Add L2 ePAPR DT cache properties so that DT can specify the cache
     geometry.
   - Preparatory patch for FIQ (NMI) kernel C code for things like
     spinlock lockup debug.  Following on from this are a couple of my
     patches cleaning up show_regs() and removing an unused (probably
     since 1.x days) do_unexp_fiq() function.
   - Use pr_warn() rather than pr_warning().
   - A number of cleanups (smp, footbridge, return_address)"

* 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm: (21 commits)
  ARM: 8167/1: extend the reserved memory for initrd to be page aligned
  ARM: 8168/1: extend __init_end to a page align address
  ARM: 8169/1: l2c: parse cache properties from ePAPR definitions
  ARM: 8160/1: drop warning about return_address not using unwind tables
  ARM: 8161/1: footbridge: select machine dir based on ARCH_FOOTBRIDGE
  ARM: 8158/1: LLVMLinux: use static inline in ARM ftrace.h
  ARM: 8155/1: place sigpage at a random offset above stack
  ARM: 8154/1: use _install_special_mapping for sigpage
  ARM: 8153/1: Enable gcov support on the ARM architecture
  ARM: Avoid writing to control register on every exception
  ARM: 8152/1: Convert pr_warning to pr_warn
  ARM: remove unused do_unexp_fiq() function
  ARM: remove extraneous newline in show_regs()
  ARM: 8150/3: fiq: Replace default FIQ handler
  ARM: 8140/1: ep93xx: Enable DEBUG_LL_UART_PL01X
  ARM: 8139/1: versatile: Enable DEBUG_LL_UART_PL01X
  ARM: 8138/1: drop ISAR0 workaround for B15
  ARM: 8136/1: sa1100: add Micro ASIC platform device
  ARM: 8131/1: arm/smp: Absorb boot_secondary()
  ARM: 8126/1: crypto: enable NEON SHA-384/SHA-512 for big endian
  ...
2014-10-08 05:30:03 -04:00