Commit graph

37 commits

Author SHA1 Message Date
Mathias Krause
9a5467bf7b crypto: user - fix info leaks in report API
Three errors resulting in kernel memory disclosure:

1/ The structures used for the netlink based crypto algorithm report API
are located on the stack. As snprintf() does not fill the remainder of
the buffer with null bytes, those stack bytes will be disclosed to users
of the API. Switch to strncpy() to fix this.

2/ crypto_report_one() does not initialize all field of struct
crypto_user_alg. Fix this to fix the heap info leak.

3/ For the module name we should copy only as many bytes as
module_name() returns -- not as much as the destination buffer could
hold. But the current code does not and therefore copies random data
from behind the end of the module name, as the module name is always
shorter than CRYPTO_MAX_ALG_NAME.

Also switch to use strncpy() to copy the algorithm's name and
driver_name. They are strings, after all.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2013-02-19 20:27:03 +08:00
Jussi Kivilinna
50fc3e8d2c crypto: add crypto_[un]register_shashes for [un]registering multiple shash entries at once
Add crypto_[un]register_shashes() to allow simplifying init/exit code of shash
crypto modules that register multiple algorithms.

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2012-08-01 17:47:26 +08:00
David S. Miller
6662df33f8 crypto: Stop using NLA_PUT*().
These macros contain a hidden goto, and are thus extremely error
prone and make code hard to audit.

Signed-off-by: David S. Miller <davem@davemloft.net>
2012-04-02 04:33:42 -04:00
Cong Wang
f0dfc0b0b7 crypto: remove the second argument of k[un]map_atomic()
Signed-off-by: Cong Wang <amwang@redhat.com>
2012-03-20 21:48:16 +08:00
Herbert Xu
3acc84739d crypto: algapi - Fix build problem with NET disabled
The report functions use NLA_PUT so we need to ensure that NET
is enabled.

Reported-by: Luis Henriques <henrix@camandro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2011-11-11 06:57:06 +08:00
Steffen Klassert
f4d663ce63 crypto: Add userspace report for shash type algorithms
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2011-10-21 14:24:04 +02:00
Herbert Xu
90246e79af crypto: hash - Fix async import on shash algorithm
The function shash_async_import did not initialise the descriptor
correctly prior to calling the underlying shash import function.

This patch adds the required initialisation.

Reported-by: Miloslav Trmac <mitr@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2010-11-04 14:48:37 -04:00
Herbert Xu
18eb8ea6ee crypto: shash - Remove usage of CRYPTO_MINALIGN
The macro CRYPTO_MINALIGN is not meant to be used directly.  This
patch replaces it with crypto_tfm_ctx_alignment.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2010-05-19 11:50:58 +10:00
Steffen Klassert
0044f3eda9 crypto: shash - Test for the algorithms import function before exporting it
crypto_init_shash_ops_async() tests for setkey and not for import
before exporting the algorithms import function to ahash.
This patch fixes this.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2009-07-24 13:57:13 +08:00
Herbert Xu
f592682f9f crypto: shash - Require all algorithms to support export/import
This patch provides a default export/import function for all
shash algorithms.  It simply copies the descriptor context as
is done by sha1_generic.

This in essence means that all existing shash algorithms now
support export/import.  This is something that will be depended
upon in implementations such as hmac.  Therefore all new shash
and ahash implementations must support export/import.

For those that cannot obtain a partial result, padlock-sha's
fallback model should be used so that a partial result is always
available.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2009-07-22 14:38:13 +08:00
Herbert Xu
cbc86b9161 crypto: shash - Fix async finup handling of null digest
When shash_ahash_finup encounters a null request, we end up not
calling the underlying final function.  This patch fixes that.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2009-07-15 21:26:41 +08:00
Herbert Xu
66f6ce5e52 crypto: ahash - Add unaligned handling and default operations
This patch exports the finup operation where available and adds
a default finup operation for ahash.  The operations final, finup
and digest also will now deal with unaligned result pointers by
copying it.  Finally export/import operations are will now be
exported too.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2009-07-15 12:40:40 +08:00
Herbert Xu
0e2d3a1263 crypto: shash - Fix alignment in unaligned operations
When we encounter an unaligned pointer we are supposed to copy
it to a temporary aligned location.  However the temporary buffer
isn't aligned properly.  This patch fixes that.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2009-07-14 21:43:56 +08:00
Herbert Xu
8c32c516eb crypto: hash - Zap unaligned buffers
Some unaligned buffers on the stack weren't zapped properly which
may cause secret data to be leaked.  This patch fixes them by doing
a zero memset.

It is also possible for us to place random kernel stack contents
in the digest buffer if a digest operation fails.  This is fixed
by only copying if the operation succeeded.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2009-07-14 21:35:36 +08:00
Herbert Xu
500b3e3c3d crypto: ahash - Remove old_ahash_alg
Now that all ahash implementations have been converted to the new
ahash type, we can remove old_ahash_alg and its associated support.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2009-07-14 20:29:57 +08:00
Herbert Xu
88056ec346 crypto: ahash - Convert to new style algorithms
This patch converts crypto_ahash to the new style.  The old ahash
algorithm type is retained until the existing ahash implementations
are also converted.  All ahash users will automatically get the
new crypto_ahash type.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2009-07-14 15:54:07 +08:00
Herbert Xu
2ca33da1de crypto: api - Remove frontend argument from extsize/init_tfm
As the extsize and init_tfm functions belong to the frontend the
frontend argument is superfluous.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2009-07-14 12:58:15 +08:00
Herbert Xu
7eddf95ec5 crypto: shash - Export async functions
This patch exports the async functions so that they can be reused
by cryptd when it switches over to using shash.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2009-07-14 12:58:08 +08:00
Herbert Xu
113adefc73 crypto: shash - Make descsize a run-time attribute
This patch changes descsize to a run-time attribute so that
implementations can change it in their init functions.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2009-07-14 12:58:00 +08:00
Herbert Xu
57cfe44bcc crypto: shash - Move null setkey check to registration time
This patch moves the run-time null setkey check to shash_prepare_alg
just like we did for finup/digest.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2009-07-12 10:46:02 +08:00
Herbert Xu
8267adab94 crypto: shash - Move finup/digest null checks to registration time
This patch moves the run-time null finup/digest checks to the
shash_prepare_alg function which is run at registration time.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2009-07-11 18:23:33 +08:00
Herbert Xu
99d27e1c59 crypto: shash - Export/import hash state only
This patch replaces the full descriptor export with an export of
the partial hash state.  This allows the use of a consistent export
format across all implementations of a given algorithm.

This is useful because a number of cases require the use of the
partial hash state, e.g., PadLock can use the SHA1 hash state
to get around the fact that it can only hash contiguous data
chunks.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2009-07-11 18:23:32 +08:00
Herbert Xu
deee2289b9 crypto: shash - Propagate reinit return value
This patch fixes crypto_shash_import to propagate the value returned
by reinit.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2009-07-08 23:39:01 +08:00
Herbert Xu
f88ad8de28 crypto: shash - Use finup in default digest
This patch simplifies the default digest function by using finup.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2009-07-08 23:32:08 +08:00
Herbert Xu
619a6ebd25 crypto: shash - Add shash_register_instance
This patch adds shash_register_instance so that shash instances
can be registered without bypassing the shash checks applied to
normal algorithms.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2009-07-08 19:00:38 +08:00
Herbert Xu
7d6f56400a crypto: shash - Add shash_attr_alg2 helper
This patch adds the helper shash_attr_alg2 which locates a shash
algorithm based on the information in the given attribute.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2009-07-08 18:58:30 +08:00
Herbert Xu
942969992d crypto: shash - Add spawn support
This patch adds the functions needed to create and use shash
spawns, i.e., to use shash algorithms in a template.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2009-07-08 18:58:29 +08:00
Herbert Xu
2e4fddd8e4 crypto: shash - Add shash_instance
This patch adds shash_instance and the associated alloc/free
functions.  This is meant to be an instance that with a shash
algorithm under it.  Note that the instance itself doesn't have
to be shash.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2009-07-08 18:57:10 +08:00
Yehuda Sadeh
f4f689933c crypto: shash - Fix unaligned calculation with short length
When the total length is shorter than the calculated number of unaligned bytes, the call to shash->update breaks. For example, calling crc32c on unaligned buffer with length of 1 can result in a system crash.

Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2009-03-27 13:03:51 +08:00
Herbert Xu
3f683d6175 crypto: api - Fix crypto_alloc_tfm/create_create_tfm return convention
This is based on a report and patch by Geert Uytterhoeven.

The functions crypto_alloc_tfm and create_create_tfm return a
pointer that needs to be adjusted by the caller when successful
and otherwise an error value.  This means that the caller has
to check for the error and only perform the adjustment if the
pointer returned is valid.

Since all callers want to make the adjustment and we know how
to adjust it ourselves, it's much easier to just return adjusted
pointer directly.

The only caveat is that we have to return a void * instead of
struct crypto_tfm *.  However, this isn't that bad because both
of these functions are for internal use only (by types code like
shash.c, not even algorithms code).

This patch also moves crypto_alloc_tfm into crypto/internal.h
(crypto_create_tfm is already there) to reflect this.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2009-02-18 16:56:59 +08:00
Herbert Xu
1693531e9e crypto: shash - Remove superfluous check in init_tfm
We're currently checking the frontend type in init_tfm.  This is
completely pointless because the fact that we're called at all
means that the frontend is ours so the type must match as well.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2009-02-18 16:48:05 +08:00
Adrian-Ken Rueegsegger
4abfd73e34 crypto: shash - Fix module refcount
Module reference counting for shash is incorrect: when
a new shash transformation is created the refcount is not
increased as it should.

Signed-off-by: Adrian-Ken Rueegsegger <rueegsegger@swiss-it.ch>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2009-02-05 16:19:31 +11:00
Herbert Xu
3751f402e0 crypto: hash - Make setkey optional
Since most cryptographic hash algorithms have no keys, this patch
makes the setkey function optional for ahash and shash.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2008-12-25 11:02:06 +11:00
Herbert Xu
5f7082ed4f crypto: hash - Export shash through hash
This patch allows shash algorithms to be used through the old hash
interface.  This is a transitional measure so we can convert the
underlying algorithms to shash before converting the users across.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2008-12-25 11:01:33 +11:00
Herbert Xu
dec8b78606 crypto: hash - Add import/export interface
It is often useful to save the partial state of a hash function
so that it can be used as a base for two or more computations.

The most prominent example is HMAC where all hashes start from
a base determined by the key.  Having an import/export interface
means that we only have to compute that base once rather than
for each message.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2008-12-25 11:01:30 +11:00
Herbert Xu
3b2f6df082 crypto: hash - Export shash through ahash
This patch allows shash algorithms to be used through the ahash
interface.  This is required before we can convert digest algorithms
over to shash.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2008-12-25 11:01:28 +11:00
Herbert Xu
7b5a080b3c crypto: hash - Add shash interface
The shash interface replaces the current synchronous hash interface.
It improves over hash in two ways.  Firstly shash is reentrant,
meaning that the same tfm may be used by two threads simultaneously
as all hashing state is stored in a local descriptor.

The other enhancement is that shash no longer takes scatter list
entries.  This is because shash is specifically designed for
synchronous algorithms and as such scatter lists are unnecessary.

All existing hash users will be converted to shash once the
algorithms have been completely converted.

There is also a new finup function that combines update with final.
This will be extended to ahash once the algorithm conversion is
done.

This is also the first time that an algorithm type has their own
registration function.  Existing algorithm types will be converted
to this way in due course.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2008-12-25 11:01:26 +11:00