linux-toradex.git/include/crypto/hash.h, branch v5.10-rc2

crypto: ahash - Remove AHASH_REQUEST_ON_STACK

2020-08-28T06:58:29+00:00

This patch removes AHASH_REQUEST_ON_STACK which is unused.

Signed-off-by: Herbert Xu 
Acked-by: Ard Biesheuvel 
Signed-off-by: Herbert Xu

crypto: ahash - Add init_tfm/exit_tfm

2020-08-28T06:58:28+00:00

This patch adds the type-safe init_tfm/exit_tfm functions to the
ahash interface.  This is meant to replace the unsafe cra_init and
cra_exit interface.

Signed-off-by: Herbert Xu

mm, treewide: rename kzfree() to kfree_sensitive()

2020-08-07T18:33:22+00:00

As said by Linus:

  A symmetric naming is only helpful if it implies symmetries in use.
  Otherwise it's actively misleading.

  In "kzalloc()", the z is meaningful and an important part of what the
  caller wants.

  In "kzfree()", the z is actively detrimental, because maybe in the
  future we really _might_ want to use that "memfill(0xdeadbeef)" or
  something. The "zero" part of the interface isn't even _relevant_.

The main reason that kzfree() exists is to clear sensitive information
that should not be leaked to other future users of the same memory
objects.

Rename kzfree() to kfree_sensitive() to follow the example of the recently
added kvfree_sensitive() and make the intention of the API more explicit.
In addition, memzero_explicit() is used to clear the memory to make sure
that it won't get optimized away by the compiler.

The renaming is done by using the command sequence:

  git grep -w --name-only kzfree |\
  xargs sed -i 's/kzfree/kfree_sensitive/'

followed by some editing of the kfree_sensitive() kerneldoc and adding
a kzfree backward compatibility macro in slab.h.

[akpm@linux-foundation.org: fs/crypto/inline_crypt.c needs linux/slab.h]
[akpm@linux-foundation.org: fix fs/crypto/inline_crypt.c some more]

Suggested-by: Joe Perches 
Signed-off-by: Waiman Long 
Signed-off-by: Andrew Morton 
Acked-by: David Howells 
Acked-by: Michal Hocko 
Acked-by: Johannes Weiner 
Cc: Jarkko Sakkinen 
Cc: James Morris 
Cc: "Serge E. Hallyn" 
Cc: Joe Perches 
Cc: Matthew Wilcox 
Cc: David Rientjes 
Cc: Dan Carpenter 
Cc: "Jason A . Donenfeld" 
Link: http://lkml.kernel.org/r/20200616154311.12314-3-longman@redhat.com
Signed-off-by: Linus Torvalds

crypto: hash - drop duplicated word in a comment

2020-07-23T07:34:19+00:00

Drop the doubled word "in" in a comment.

Signed-off-by: Randy Dunlap 
Cc: Herbert Xu 
Cc: "David S. Miller" 
Cc: linux-crypto@vger.kernel.org
Acked-by: David S. Miller 
Signed-off-by: Herbert Xu

crypto: hash - introduce crypto_shash_tfm_digest()

2020-05-08T05:32:12+00:00

Currently the simplest use of the shash API is to use
crypto_shash_digest() to digest a whole buffer.  However, this still
requires allocating a hash descriptor (struct shash_desc).  Many users
don't really want to preallocate one and instead just use a one-off
descriptor on the stack like the following:

	{
		SHASH_DESC_ON_STACK(desc, tfm);
		int err;

		desc->tfm = tfm;

		err = crypto_shash_digest(desc, data, len, out);

		shash_desc_zero(desc);
	}

Wrap this in a new helper function crypto_shash_tfm_digest() that can be
used instead of the above.

Signed-off-by: Eric Biggers 
Signed-off-by: Herbert Xu

crypto: shash - Add init_tfm/exit_tfm and verify descsize

2019-12-11T08:48:39+00:00

The shash interface supports a dynamic descsize field because of
the presence of fallbacks (it's just padlock-sha actually, perhaps
we can remove it one day).  As it is the API does not verify the
setting of descsize at all.  It is up to the individual algorithms
to ensure that descsize does not exceed the specified maximum value
of HASH_MAX_DESCSIZE (going above would cause stack corruption).

In order to allow the API to impose this limit directly, this patch
adds init_tfm/exit_tfm hooks to the shash_alg structure.  We can
then verify the descsize setting in the API directly.

Signed-off-by: Herbert Xu 
Reviewed-by: Eric Biggers 
Signed-off-by: Herbert Xu

crypto: ablkcipher - remove deprecated and unused ablkcipher support

2019-11-17T01:02:49+00:00

Now that all users of the deprecated ablkcipher interface have been
moved to the skcipher interface, ablkcipher is no longer used and
can be removed.

Reviewed-by: Eric Biggers 
Signed-off-by: Ard Biesheuvel 
Signed-off-by: Herbert Xu

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152

2019-05-30T18:26:32+00:00

Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner 
Reviewed-by: Allison Randal 
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman

crypto: hash - fix incorrect HASH_MAX_DESCSIZE

2019-05-17T05:36:54+00:00

The "hmac(sha3-224-generic)" algorithm has a descsize of 368 bytes,
which is greater than HASH_MAX_DESCSIZE (360) which is only enough for
sha3-224-generic.  The check in shash_prepare_alg() doesn't catch this
because the HMAC template doesn't set descsize on the algorithms, but
rather sets it on each individual HMAC transform.

This causes a stack buffer overflow when SHASH_DESC_ON_STACK() is used
with hmac(sha3-224-generic).

Fix it by increasing HASH_MAX_DESCSIZE to the real maximum.  Also add a
sanity check to hmac_init().

This was detected by the improved crypto self-tests in v5.2, by loading
the tcrypt module with CONFIG_CRYPTO_MANAGER_EXTRA_TESTS=y enabled.  I
didn't notice this bug when I ran the self-tests by requesting the
algorithms via AF_ALG (i.e., not using tcrypt), probably because the
stack layout differs in the two cases and that made a difference here.

KASAN report:

    BUG: KASAN: stack-out-of-bounds in memcpy include/linux/string.h:359 [inline]
    BUG: KASAN: stack-out-of-bounds in shash_default_import+0x52/0x80 crypto/shash.c:223
    Write of size 360 at addr ffff8880651defc8 by task insmod/3689

    CPU: 2 PID: 3689 Comm: insmod Tainted: G            E     5.1.0-10741-g35c99ffa20edd #11
    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
    Call Trace:
     __dump_stack lib/dump_stack.c:77 [inline]
     dump_stack+0x86/0xc5 lib/dump_stack.c:113
     print_address_description+0x7f/0x260 mm/kasan/report.c:188
     __kasan_report+0x144/0x187 mm/kasan/report.c:317
     kasan_report+0x12/0x20 mm/kasan/common.c:614
     check_memory_region_inline mm/kasan/generic.c:185 [inline]
     check_memory_region+0x137/0x190 mm/kasan/generic.c:191
     memcpy+0x37/0x50 mm/kasan/common.c:125
     memcpy include/linux/string.h:359 [inline]
     shash_default_import+0x52/0x80 crypto/shash.c:223
     crypto_shash_import include/crypto/hash.h:880 [inline]
     hmac_import+0x184/0x240 crypto/hmac.c:102
     hmac_init+0x96/0xc0 crypto/hmac.c:107
     crypto_shash_init include/crypto/hash.h:902 [inline]
     shash_digest_unaligned+0x9f/0xf0 crypto/shash.c:194
     crypto_shash_digest+0xe9/0x1b0 crypto/shash.c:211
     generate_random_hash_testvec.constprop.11+0x1ec/0x5b0 crypto/testmgr.c:1331
     test_hash_vs_generic_impl+0x3f7/0x5c0 crypto/testmgr.c:1420
     __alg_test_hash+0x26d/0x340 crypto/testmgr.c:1502
     alg_test_hash+0x22e/0x330 crypto/testmgr.c:1552
     alg_test.part.7+0x132/0x610 crypto/testmgr.c:4931
     alg_test+0x1f/0x40 crypto/testmgr.c:4952

Fixes: b68a7ec1e9a3 ("crypto: hash - Remove VLA usage")
Reported-by: Corentin Labbe 
Cc:  # v4.20+
Cc: Kees Cook 
Signed-off-by: Eric Biggers 
Reviewed-by: Kees Cook 
Tested-by: Corentin Labbe 
Signed-off-by: Herbert Xu

crypto: shash - remove shash_desc::flags

2019-04-25T07:38:12+00:00

The flags field in 'struct shash_desc' never actually does anything.
The only ostensibly supported flag is CRYPTO_TFM_REQ_MAY_SLEEP.
However, no shash algorithm ever sleeps, making this flag a no-op.

With this being the case, inevitably some users who can't sleep wrongly
pass MAY_SLEEP.  These would all need to be fixed if any shash algorithm
actually started sleeping.  For example, the shash_ahash_*() functions,
which wrap a shash algorithm with the ahash API, pass through MAY_SLEEP
from the ahash API to the shash API.  However, the shash functions are
called under kmap_atomic(), so actually they're assumed to never sleep.

Even if it turns out that some users do need preemption points while
hashing large buffers, we could easily provide a helper function
crypto_shash_update_large() which divides the data into smaller chunks
and calls crypto_shash_update() and cond_resched() for each chunk.  It's
not necessary to have a flag in 'struct shash_desc', nor is it necessary
to make individual shash algorithms aware of this at all.

Therefore, remove shash_desc::flags, and document that the
crypto_shash_*() functions can be called from any context.

Signed-off-by: Eric Biggers 
Signed-off-by: Herbert Xu