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  1. 05 4月, 2017 3 次提交
  3. 24 3月, 2017 6 次提交
  5. 10 3月, 2017 1 次提交
    • D
      net: Work around lockdep limitation in sockets that use sockets · cdfbabfb
      由 David Howells 提交于 
      Lockdep issues a circular dependency warning when AFS issues an operation
through AF_RXRPC from a context in which the VFS/VM holds the mmap_sem.

The theory lockdep comes up with is as follows:

 (1) If the pagefault handler decides it needs to read pages from AFS, it
     calls AFS with mmap_sem held and AFS begins an AF_RXRPC call, but
     creating a call requires the socket lock:

	mmap_sem must be taken before sk_lock-AF_RXRPC

 (2) afs_open_socket() opens an AF_RXRPC socket and binds it.  rxrpc_bind()
     binds the underlying UDP socket whilst holding its socket lock.
     inet_bind() takes its own socket lock:

	sk_lock-AF_RXRPC must be taken before sk_lock-AF_INET

 (3) Reading from a TCP socket into a userspace buffer might cause a fault
     and thus cause the kernel to take the mmap_sem, but the TCP socket is
     locked whilst doing this:

	sk_lock-AF_INET must be taken before mmap_sem

However, lockdep's theory is wrong in this instance because it deals only
with lock classes and not individual locks.  The AF_INET lock in (2) isn't
really equivalent to the AF_INET lock in (3) as the former deals with a
socket entirely internal to the kernel that never sees userspace.  This is
a limitation in the design of lockdep.

Fix the general case by:

 (1) Double up all the locking keys used in sockets so that one set are
     used if the socket is created by userspace and the other set is used
     if the socket is created by the kernel.

 (2) Store the kern parameter passed to sk_alloc() in a variable in the
     sock struct (sk_kern_sock).  This informs sock_lock_init(),
     sock_init_data() and sk_clone_lock() as to the lock keys to be used.

     Note that the child created by sk_clone_lock() inherits the parent's
     kern setting.

 (3) Add a 'kern' parameter to ->accept() that is analogous to the one
     passed in to ->create() that distinguishes whether kernel_accept() or
     sys_accept4() was the caller and can be passed to sk_alloc().

     Note that a lot of accept functions merely dequeue an already
     allocated socket.  I haven't touched these as the new socket already
     exists before we get the parameter.

     Note also that there are a couple of places where I've made the accepted
     socket unconditionally kernel-based:

	irda_accept()
	rds_rcp_accept_one()
	tcp_accept_from_sock()

     because they follow a sock_create_kern() and accept off of that.

Whilst creating this, I noticed that lustre and ocfs don't create sockets
through sock_create_kern() and thus they aren't marked as for-kernel,
though they appear to be internal.  I wonder if these should do that so
that they use the new set of lock keys.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      cdfbabfb
  7. 09 3月, 2017 9 次提交
  9. 02 3月, 2017 3 次提交
  11. 01 3月, 2017 1 次提交
    • L
      crypto: testmgr - Pad aes_ccm_enc_tv_template vector · 1c68bb0f
      由 Laura Abbott 提交于 
      Running with KASAN and crypto tests currently gives

 BUG: KASAN: global-out-of-bounds in __test_aead+0x9d9/0x2200 at addr ffffffff8212fca0
 Read of size 16 by task cryptomgr_test/1107
 Address belongs to variable 0xffffffff8212fca0
 CPU: 0 PID: 1107 Comm: cryptomgr_test Not tainted 4.10.0+ #45
 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.1-1.fc24 04/01/2014
 Call Trace:
  dump_stack+0x63/0x8a
  kasan_report.part.1+0x4a7/0x4e0
  ? __test_aead+0x9d9/0x2200
  ? crypto_ccm_init_crypt+0x218/0x3c0 [ccm]
  kasan_report+0x20/0x30
  check_memory_region+0x13c/0x1a0
  memcpy+0x23/0x50
  __test_aead+0x9d9/0x2200
  ? kasan_unpoison_shadow+0x35/0x50
  ? alg_test_akcipher+0xf0/0xf0
  ? crypto_skcipher_init_tfm+0x2e3/0x310
  ? crypto_spawn_tfm2+0x37/0x60
  ? crypto_ccm_init_tfm+0xa9/0xd0 [ccm]
  ? crypto_aead_init_tfm+0x7b/0x90
  ? crypto_alloc_tfm+0xc4/0x190
  test_aead+0x28/0xc0
  alg_test_aead+0x54/0xd0
  alg_test+0x1eb/0x3d0
  ? alg_find_test+0x90/0x90
  ? __sched_text_start+0x8/0x8
  ? __wake_up_common+0x70/0xb0
  cryptomgr_test+0x4d/0x60
  kthread+0x173/0x1c0
  ? crypto_acomp_scomp_free_ctx+0x60/0x60
  ? kthread_create_on_node+0xa0/0xa0
  ret_from_fork+0x2c/0x40
 Memory state around the buggy address:
  ffffffff8212fb80: 00 00 00 00 01 fa fa fa fa fa fa fa 00 00 00 00
  ffffffff8212fc00: 00 01 fa fa fa fa fa fa 00 00 00 00 01 fa fa fa
 >ffffffff8212fc80: fa fa fa fa 00 05 fa fa fa fa fa fa 00 00 00 00
                                   ^
  ffffffff8212fd00: 01 fa fa fa fa fa fa fa 00 00 00 00 01 fa fa fa
  ffffffff8212fd80: fa fa fa fa 00 00 00 00 00 05 fa fa fa fa fa fa

This always happens on the same IV which is less than 16 bytes.

Per Ard,

"CCM IVs are 16 bytes, but due to the way they are constructed
internally, the final couple of bytes of input IV are dont-cares.

Apparently, we do read all 16 bytes, which triggers the KASAN errors."

Fix this by padding the IV with null bytes to be at least 16 bytes.

Cc: stable@vger.kernel.org
Fixes: 0bc5a6c5 ("crypto: testmgr - Disable rfc4309 test and convert
test vectors")
Acked-by: NArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: NLaura Abbott <labbott@redhat.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
      1c68bb0f
  13. 28 2月, 2017 1 次提交
  15. 27 2月, 2017 1 次提交
  17. 25 2月, 2017 1 次提交
  19. 23 2月, 2017 1 次提交
  21. 15 2月, 2017 2 次提交
  23. 11 2月, 2017 6 次提交
    • A
      crypto: algapi - make crypto_xor() and crypto_inc() alignment agnostic · db91af0f
      由 Ard Biesheuvel 提交于 
      Instead of unconditionally forcing 4 byte alignment for all generic
chaining modes that rely on crypto_xor() or crypto_inc() (which may
result in unnecessary copying of data when the underlying hardware
can perform unaligned accesses efficiently), make those functions
deal with unaligned input explicitly, but only if the Kconfig symbol
HAVE_EFFICIENT_UNALIGNED_ACCESS is set. This will allow us to drop
the alignmasks from the CBC, CMAC, CTR, CTS, PCBC and SEQIV drivers.

For crypto_inc(), this simply involves making the 4-byte stride
conditional on HAVE_EFFICIENT_UNALIGNED_ACCESS being set, given that
it typically operates on 16 byte buffers.

For crypto_xor(), an algorithm is implemented that simply runs through
the input using the largest strides possible if unaligned accesses are
allowed. If they are not, an optimal sequence of memory accesses is
emitted that takes the relative alignment of the input buffers into
account, e.g., if the relative misalignment of dst and src is 4 bytes,
the entire xor operation will be completed using 4 byte loads and stores
(modulo unaligned bits at the start and end). Note that all expressions
involving misalign are simply eliminated by the compiler when
HAVE_EFFICIENT_UNALIGNED_ACCESS is defined.
Signed-off-by: NArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
      db91af0f
    • A
      crypto: improve gcc optimization flags for serpent and wp512 · 7d6e9105
      由 Arnd Bergmann 提交于 
      An ancient gcc bug (first reported in 2003) has apparently resurfaced
on MIPS, where kernelci.org reports an overly large stack frame in the
whirlpool hash algorithm:

crypto/wp512.c:987:1: warning: the frame size of 1112 bytes is larger than 1024 bytes [-Wframe-larger-than=]

With some testing in different configurations, I'm seeing large
variations in stack frames size up to 1500 bytes for what should have
around 300 bytes at most. I also checked the reference implementation,
which is essentially the same code but also comes with some test and
benchmarking infrastructure.

It seems that recent compiler versions on at least arm, arm64 and powerpc
have a partial fix for this problem, but enabling "-fsched-pressure", but
even with that fix they suffer from the issue to a certain degree. Some
testing on arm64 shows that the time needed to hash a given amount of
data is roughly proportional to the stack frame size here, which makes
sense given that the wp512 implementation is doing lots of loads for
table lookups, and the problem with the overly large stack is a result
of doing a lot more loads and stores for spilled registers (as seen from
inspecting the object code).

Disabling -fschedule-insns consistently fixes the problem for wp512,
in my collection of cross-compilers, the results are consistently better
or identical when comparing the stack sizes in this function, though
some architectures (notable x86) have schedule-insns disabled by
default.

The four columns are:
default: -O2
press:	 -O2 -fsched-pressure
nopress: -O2 -fschedule-insns -fno-sched-pressure
nosched: -O2 -no-schedule-insns (disables sched-pressure)

				default	press	nopress	nosched
alpha-linux-gcc-4.9.3		1136	848	1136	176
am33_2.0-linux-gcc-4.9.3	2100	2076	2100	2104
arm-linux-gnueabi-gcc-4.9.3	848	848	1048	352
cris-linux-gcc-4.9.3		272	272	272	272
frv-linux-gcc-4.9.3		1128	1000	1128	280
hppa64-linux-gcc-4.9.3		1128	336	1128	184
hppa-linux-gcc-4.9.3		644	308	644	276
i386-linux-gcc-4.9.3		352	352	352	352
m32r-linux-gcc-4.9.3		720	656	720	268
microblaze-linux-gcc-4.9.3	1108	604	1108	256
mips64-linux-gcc-4.9.3		1328	592	1328	208
mips-linux-gcc-4.9.3		1096	624	1096	240
powerpc64-linux-gcc-4.9.3	1088	432	1088	160
powerpc-linux-gcc-4.9.3		1080	584	1080	224
s390-linux-gcc-4.9.3		456	456	624	360
sh3-linux-gcc-4.9.3		292	292	292	292
sparc64-linux-gcc-4.9.3		992	240	992	208
sparc-linux-gcc-4.9.3		680	592	680	312
x86_64-linux-gcc-4.9.3		224	240	272	224
xtensa-linux-gcc-4.9.3		1152	704	1152	304

aarch64-linux-gcc-7.0.0		224	224	1104	208
arm-linux-gnueabi-gcc-7.0.1	824	824	1048	352
mips-linux-gcc-7.0.0		1120	648	1120	272
x86_64-linux-gcc-7.0.1		240	240	304	240

arm-linux-gnueabi-gcc-4.4.7	840			392
arm-linux-gnueabi-gcc-4.5.4	784	728	784	320
arm-linux-gnueabi-gcc-4.6.4	736	728	736	304
arm-linux-gnueabi-gcc-4.7.4	944	784	944	352
arm-linux-gnueabi-gcc-4.8.5	464	464	760	352
arm-linux-gnueabi-gcc-4.9.3	848	848	1048	352
arm-linux-gnueabi-gcc-5.3.1	824	824	1064	336
arm-linux-gnueabi-gcc-6.1.1	808	808	1056	344
arm-linux-gnueabi-gcc-7.0.1	824	824	1048	352

Trying the same test for serpent-generic, the picture is a bit different,
and while -fno-schedule-insns is generally better here than the default,
-fsched-pressure wins overall, so I picked that instead.

				default	press	nopress	nosched
alpha-linux-gcc-4.9.3		1392	864	1392	960
am33_2.0-linux-gcc-4.9.3	536	524	536	528
arm-linux-gnueabi-gcc-4.9.3	552	552	776	536
cris-linux-gcc-4.9.3		528	528	528	528
frv-linux-gcc-4.9.3		536	400	536	504
hppa64-linux-gcc-4.9.3		524	208	524	480
hppa-linux-gcc-4.9.3		768	472	768	508
i386-linux-gcc-4.9.3		564	564	564	564
m32r-linux-gcc-4.9.3		712	576	712	532
microblaze-linux-gcc-4.9.3	724	392	724	512
mips64-linux-gcc-4.9.3		720	384	720	496
mips-linux-gcc-4.9.3		728	384	728	496
powerpc64-linux-gcc-4.9.3	704	304	704	480
powerpc-linux-gcc-4.9.3		704	296	704	480
s390-linux-gcc-4.9.3		560	560	592	536
sh3-linux-gcc-4.9.3		540	540	540	540
sparc64-linux-gcc-4.9.3		544	352	544	496
sparc-linux-gcc-4.9.3		544	344	544	496
x86_64-linux-gcc-4.9.3		528	536	576	528
xtensa-linux-gcc-4.9.3		752	544	752	544

aarch64-linux-gcc-7.0.0		432	432	656	480
arm-linux-gnueabi-gcc-7.0.1	616	616	808	536
mips-linux-gcc-7.0.0		720	464	720	488
x86_64-linux-gcc-7.0.1		536	528	600	536

arm-linux-gnueabi-gcc-4.4.7	592			440
arm-linux-gnueabi-gcc-4.5.4	776	448	776	544
arm-linux-gnueabi-gcc-4.6.4	776	448	776	544
arm-linux-gnueabi-gcc-4.7.4	768	448	768	544
arm-linux-gnueabi-gcc-4.8.5	488	488	776	544
arm-linux-gnueabi-gcc-4.9.3	552	552	776	536
arm-linux-gnueabi-gcc-5.3.1	552	552	776	536
arm-linux-gnueabi-gcc-6.1.1	560	560	776	536
arm-linux-gnueabi-gcc-7.0.1	616	616	808	536

I did not do any runtime tests with serpent, so it is possible that stack
frame size does not directly correlate with runtime performance here and
it actually makes things worse, but it's more likely to help here, and
the reduced stack frame size is probably enough reason to apply the patch,
especially given that the crypto code is often used in deep call chains.

Link: https://kernelci.org/build/id/58797d7559b5149efdf6c3a9/logs/
Link: http://www.larc.usp.br/~pbarreto/WhirlpoolPage.html
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=11488
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79149
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
      7d6e9105
    • A
      crypto: ccm - switch to separate cbcmac driver · f15f05b0
      由 Ard Biesheuvel 提交于 
      Update the generic CCM driver to defer CBC-MAC processing to a
dedicated CBC-MAC ahash transform rather than open coding this
transform (and much of the associated scatterwalk plumbing) in
the CCM driver itself.

This cleans up the code considerably, but more importantly, it allows
the use of alternative CBC-MAC implementations that don't suffer from
performance degradation due to significant setup time (e.g., the NEON
based AES code needs to enable/disable the NEON, and load the S-box
into 16 SIMD registers, which cannot be amortized over the entire input
when using the cipher interface)
Signed-off-by: NArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
      f15f05b0
    • A
      crypto: testmgr - add test cases for cbcmac(aes) · 092acf06
      由 Ard Biesheuvel 提交于 
      In preparation of splitting off the CBC-MAC transform in the CCM
driver into a separate algorithm, define some test cases for the
AES incarnation of cbcmac.
Signed-off-by: NArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
      092acf06
    • A
      crypto: aes - add generic time invariant AES cipher · b5e0b032
      由 Ard Biesheuvel 提交于 
      Lookup table based AES is sensitive to timing attacks, which is due to
the fact that such table lookups are data dependent, and the fact that
8 KB worth of tables covers a significant number of cachelines on any
architecture, resulting in an exploitable correlation between the key
and the processing time for known plaintexts.

For network facing algorithms such as CTR, CCM or GCM, this presents a
security risk, which is why arch specific AES ports are typically time
invariant, either through the use of special instructions, or by using
SIMD algorithms that don't rely on table lookups.

For generic code, this is difficult to achieve without losing too much
performance, but we can improve the situation significantly by switching
to an implementation that only needs 256 bytes of table data (the actual
S-box itself), which can be prefetched at the start of each block to
eliminate data dependent latencies.

This code encrypts at ~25 cycles per byte on ARM Cortex-A57 (while the
ordinary generic AES driver manages 18 cycles per byte on this
hardware). Decryption is substantially slower.
Signed-off-by: NArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
      b5e0b032
    • A
      crypto: aes-generic - drop alignment requirement · ec38a937
      由 Ard Biesheuvel 提交于 
      The generic AES code exposes a 32-bit align mask, which forces all
users of the code to use temporary buffers or take other measures to
ensure the alignment requirement is adhered to, even on architectures
that don't care about alignment for software algorithms such as this
one.

So drop the align mask, and fix the code to use get_unaligned_le32()
where appropriate, which will resolve to whatever is optimal for the
architecture.
Signed-off-by: NArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
      ec38a937
  25. 03 2月, 2017 1 次提交
  27. 23 1月, 2017 2 次提交
  29. 13 1月, 2017 2 次提交
    • A
      crypto: testmgr - use calculated count for number of test vectors · 21c8e720
      由 Ard Biesheuvel 提交于 
      When working on AES in CCM mode for ARM, my code passed the internal
tcrypt test before I had even bothered to implement the AES-192 and
AES-256 code paths, which is strange because the tcrypt does contain
AES-192 and AES-256 test vectors for CCM.

As it turned out, the define AES_CCM_ENC_TEST_VECTORS was out of sync
with the actual number of test vectors, causing only the AES-128 ones
to be executed.

So get rid of the defines, and wrap the test vector references in a
macro that calculates the number of vectors automatically.

The following test vector counts were out of sync with the respective
defines:

    BF_CTR_ENC_TEST_VECTORS          2 ->  3
    BF_CTR_DEC_TEST_VECTORS          2 ->  3
    TF_CTR_ENC_TEST_VECTORS          2 ->  3
    TF_CTR_DEC_TEST_VECTORS          2 ->  3
    SERPENT_CTR_ENC_TEST_VECTORS     2 ->  3
    SERPENT_CTR_DEC_TEST_VECTORS     2 ->  3
    AES_CCM_ENC_TEST_VECTORS         8 -> 14
    AES_CCM_DEC_TEST_VECTORS         7 -> 17
    AES_CCM_4309_ENC_TEST_VECTORS    7 -> 23
    AES_CCM_4309_DEC_TEST_VECTORS   10 -> 23
    CAMELLIA_CTR_ENC_TEST_VECTORS    2 ->  3
    CAMELLIA_CTR_DEC_TEST_VECTORS    2 ->  3
Signed-off-by: NArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
      21c8e720
    • A
      crypto: testmgr - Allocate only the required output size for hash tests · e93acd6f
      由 Andrew Lutomirski 提交于 
      There are some hashes (e.g. sha224) that have some internal trickery
to make sure that only the correct number of output bytes are
generated.  If something goes wrong, they could potentially overrun
the output buffer.

Make the test more robust by allocating only enough space for the
correct output size so that memory debugging will catch the error if
the output is overrun.

Tested by intentionally breaking sha224 to output all 256
internally-generated bits while running on KASAN.

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: NAndy Lutomirski <luto@kernel.org>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
      e93acd6f