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2016-04-05lib/mpi: mpi_write_sgl(): fix skipping of leading zero limbsNicolai Stange
Currently, if the number of leading zeros is greater than fits into a complete limb, mpi_write_sgl() skips them by iterating over them limb-wise. However, it fails to adjust its internal leading zeros tracking variable, lzeros, accordingly: it does a p -= sizeof(alimb); continue; which should really have been a lzeros -= sizeof(alimb); continue; Since lzeros never decreases if its initial value >= sizeof(alimb), nothing gets copied by mpi_write_sgl() in that case. Instead of skipping the high order zero limbs within the loop as shown above, fix the issue by adjusting the copying loop's bounds. Fixes: 2d4d1eea540b ("lib/mpi: Add mpi sgl helpers") Signed-off-by: Nicolai Stange <nicstange@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2016-02-28lib/mpi: use "static inline" instead of "extern inline"Arnd Bergmann
When we use CONFIG_PROFILE_ALL_BRANCHES, every 'if()' introduces a static variable, but that is not allowed in 'extern inline' functions: mpi-inline.h:116:204: warning: '______f' is static but declared in inline function 'mpihelp_sub' which is not static mpi-inline.h:113:184: warning: '______f' is static but declared in inline function 'mpihelp_sub' which is not static mpi-inline.h:70:184: warning: '______f' is static but declared in inline function 'mpihelp_add' which is not static mpi-inline.h:56:204: warning: '______f' is static but declared in inline function 'mpihelp_add_1' which is not static This changes the MPI code to use 'static inline' instead, to get rid of hundreds of warnings. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2016-02-28lib/mpi: avoid assembler warningArnd Bergmann
A wrapper around the umull assembly instruction might reuse the input register as an output, which is undefined on some ARM machines, as pointed out by this assembler warning: CC lib/mpi/generic_mpih-mul1.o /tmp/ccxJuxIy.s: Assembler messages: /tmp/ccxJuxIy.s:53: rdhi, rdlo and rm must all be different CC lib/mpi/generic_mpih-mul2.o /tmp/ccI0scAD.s: Assembler messages: /tmp/ccI0scAD.s:53: rdhi, rdlo and rm must all be different CC lib/mpi/generic_mpih-mul3.o /tmp/ccMvVQcp.s: Assembler messages: /tmp/ccMvVQcp.s:53: rdhi, rdlo and rm must all be different This changes the constraints to force different registers to be used as output. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2016-02-28lib/mpi: Endianness fixMichal Marek
The limbs are integers in the host endianness, so we can't simply iterate over the individual bytes. The current code happens to work on little-endian, because the order of the limbs in the MPI array is the same as the order of the bytes in each limb, but it breaks on big-endian. Fixes: 0f74fbf77d45 ("MPI: Fix mpi_read_buffer") Signed-off-by: Michal Marek <mmarek@suse.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2015-11-17lib/mpi: only require buffers as big as needed for the integerAndrzej Zaborowski
Since mpi_write_to_sgl and mpi_read_buffer explicitly left-align the integers being written it makes no sense to require a buffer big enough for the number + the leading zero bytes which are not written. The error returned also doesn't convey any information. So instead require only the size needed and return -EOVERFLOW to signal when buffer too short. Signed-off-by: Andrew Zaborowski <andrew.zaborowski@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2015-11-06Merge tag 'asm-generic-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic Pull asm-generic cleanups from Arnd Bergmann: "The asm-generic changes for 4.4 are mostly a series from Christoph Hellwig to clean up various abuses of headers in there. The patch to rename the io-64-nonatomic-*.h headers caused some conflicts with new users, so I added a workaround that we can remove in the next merge window. The only other patch is a warning fix from Marek Vasut" * tag 'asm-generic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic: asm-generic: temporarily add back asm-generic/io-64-nonatomic*.h asm-generic: cmpxchg: avoid warnings from macro-ized cmpxchg() implementations gpio-mxc: stop including <asm-generic/bug> n_tracesink: stop including <asm-generic/bug> n_tracerouter: stop including <asm-generic/bug> mlx5: stop including <asm-generic/kmap_types.h> hifn_795x: stop including <asm-generic/kmap_types.h> drbd: stop including <asm-generic/kmap_types.h> move count_zeroes.h out of asm-generic move io-64-nonatomic*.h out of asm-generic
2015-10-20lib/mpi: fix off by one in mpi_read_raw_from_sglStephan Mueller
The patch fixes the analysis of the input data which contains an off by one. The issue is visible when the SGL contains one byte per SG entry. The code for checking for zero bytes does not operate on the data byte. Signed-off-by: Stephan Mueller <smueller@chronox.de> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2015-10-15move count_zeroes.h out of asm-genericChristoph Hellwig
This header contains a few helpers currenly only used by the mpi implementation, and not default implementation of architecture code. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2015-10-14lib/mpi: Add mpi sgl helpersTadeusz Struk
Add mpi_read_raw_from_sgl and mpi_write_to_sgl helpers. Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2015-08-25MPI: Fix mpi_read_bufferTadeusz Struk
Change mpi_read_buffer to return a number without leading zeros so that mpi_read_buffer and mpi_get_buffer return the same thing. Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2015-06-22Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6Linus Torvalds
Pull crypto update from Herbert Xu: "Here is the crypto update for 4.2: API: - Convert RNG interface to new style. - New AEAD interface with one SG list for AD and plain/cipher text. All external AEAD users have been converted. - New asymmetric key interface (akcipher). Algorithms: - Chacha20, Poly1305 and RFC7539 support. - New RSA implementation. - Jitter RNG. - DRBG is now seeded with both /dev/random and Jitter RNG. If kernel pool isn't ready then DRBG will be reseeded when it is. - DRBG is now the default crypto API RNG, replacing krng. - 842 compression (previously part of powerpc nx driver). Drivers: - Accelerated SHA-512 for arm64. - New Marvell CESA driver that supports DMA and more algorithms. - Updated powerpc nx 842 support. - Added support for SEC1 hardware to talitos" * git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (292 commits) crypto: marvell/cesa - remove COMPILE_TEST dependency crypto: algif_aead - Temporarily disable all AEAD algorithms crypto: af_alg - Forbid the use internal algorithms crypto: echainiv - Only hold RNG during initialisation crypto: seqiv - Add compatibility support without RNG crypto: eseqiv - Offer normal cipher functionality without RNG crypto: chainiv - Offer normal cipher functionality without RNG crypto: user - Add CRYPTO_MSG_DELRNG crypto: user - Move cryptouser.h to uapi crypto: rng - Do not free default RNG when it becomes unused crypto: skcipher - Allow givencrypt to be NULL crypto: sahara - propagate the error on clk_disable_unprepare() failure crypto: rsa - fix invalid select for AKCIPHER crypto: picoxcell - Update to the current clk API crypto: nx - Check for bogus firmware properties crypto: marvell/cesa - add DT bindings documentation crypto: marvell/cesa - add support for Kirkwood and Dove SoCs crypto: marvell/cesa - add support for Orion SoCs crypto: marvell/cesa - add allhwsupport module parameter crypto: marvell/cesa - add support for all armada SoCs ...
2015-06-16MPILIB: add mpi_read_buf() and mpi_get_size() helpersTadeusz Struk
Added a mpi_read_buf() helper function to export MPI to a buf provided by the user, and a mpi_get_size() helper, that tells the user how big the buf is. Changed mpi_free to use kzfree instead of kfree because it is used to free crypto keys. Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2015-06-13MPI: MIPS: Fix compilation error with GCC 5.1Jaedon Shin
This patch fixes mips compilation error: lib/mpi/generic_mpih-mul1.c: In function 'mpihelp_mul_1': lib/mpi/longlong.h:651:2: error: impossible constraint in 'asm' Signed-off-by: Jaedon Shin <jaedon.shin@gmail.com> Cc: Linux-MIPS <linux-mips@linux-mips.org> Patchwork: https://patchwork.linux-mips.org/patch/10546/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-01-14MPILIB: Fix comparison of negative MPIsRasmus Villemoes
If u and v both represent negative integers and their limb counts happen to differ, mpi_cmp will always return a positive value - this is obviously bogus. u is smaller than v if and only if it is larger in absolute value. Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
2015-01-14MPILIB: Fix obvious but harmless typoRasmus Villemoes
The macro MPN_COPY_INCR this occurs in isn't used anywhere. Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by: David Howells <dhowells@redhat.com>
2015-01-14MPILIB: Deobfuscate mpi_cmpRasmus Villemoes
The condition preceding 'return 1;' makes my head hurt. At this point, we know that u and v have the same sign; if they are negative, they compare opposite to how their absolute values compare (which mpihelp_cmp found for us), otherwise cmp itself is the answer. Negating cmp is ok since mpihelp_cmp returns {-1,0,1}; -INT_MIN==INT_MIN won't bite us. Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
2013-09-25MPILIB: add module description and licenseKonstantin Khlebnikov
This patch fixes lack of license, otherwise mpi.ko taints kernel. Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org> Signed-off-by: David Howells <dhowells@redhat.com>
2013-07-19alpha: Modernize lib/mpi/longlong.hRichard Henderson
Remove the compile warning for __udiv_qrnnd not having a prototype. Use the __builtin_alpha_umulh introduced in gcc 4.0. Reviewed-and-Tested-by: Matt Turner <mattst88@gmail.com> Signed-off-by: Matt Turner <mattst88@gmail.com> Signed-off-by: Richard Henderson <rth@twiddle.net>
2013-06-12lib/mpi/mpicoder.c: looping issue, need stop when equal to zero, found by ↵Chen Gang
'EXTRA_FLAGS=-W'. For 'while' looping, need stop when 'nbytes == 0', or will cause issue. ('nbytes' is size_t which is always bigger or equal than zero). The related warning: (with EXTRA_CFLAGS=-W) lib/mpi/mpicoder.c:40:2: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits] Signed-off-by: Chen Gang <gang.chen@asianux.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: David Howells <dhowells@redhat.com> Cc: James Morris <james.l.morris@oracle.com> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-05-24MPILIB: disable usage of floating point registers on pariscHelge Deller
The umul_ppmm() macro for parisc uses the xmpyu assembler statement which does calculation via a floating point register. But usage of floating point registers inside the Linux kernel are not allowed and gcc will stop compilation due to the -mdisable-fpregs compiler option. Fix this by disabling the umul_ppmm() and udiv_qrnnd() macros. The mpilib will then use the generic built-in implementations instead. Signed-off-by: Helge Deller <deller@gmx.de>
2013-02-01mpilib: use DIV_ROUND_UP and remove unused macrosAndy Shevchenko
Remove MIN, MAX and ABS macros that are duplicates kernel's native implementation. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: James Morris <james.l.morris@oracle.com>
2012-11-23MPI: Fix compilation on MIPS with GCC 4.4 and newerManuel Lauss
Since 4.4 GCC on MIPS no longer recognizes the "h" constraint, leading to this build failure: CC lib/mpi/generic_mpih-mul1.o lib/mpi/generic_mpih-mul1.c: In function 'mpihelp_mul_1': lib/mpi/generic_mpih-mul1.c:50:3: error: impossible constraint in 'asm' This patch updates MPI with the latest umul_ppm implementations for MIPS. Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com> Cc: Linux-MIPS <linux-mips@linux-mips.org> Cc: Dmitry Kasatkin <dmitry.kasatkin@intel.com> Cc: James Morris <jmorris@namei.org> Patchwork: https://patchwork.linux-mips.org/patch/4612/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2012-10-08MPILIB: Provide a function to read raw data into an MPIDavid Howells
Provide a function to read raw data of a predetermined size into an MPI rather than expecting the size to be encoded within the data. The data is assumed to represent an unsigned integer, and the resulting MPI will be positive. The function looks like this: MPI mpi_read_raw_data(const void *, size_t); This is useful for reading ASN.1 integer primitives where the length is encoded in the ASN.1 metadata. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2012-10-08MPILIB: Reinstate mpi_cmp[_ui]() and export for RSA signature verificationDavid Howells
Reinstate and export mpi_cmp() and mpi_cmp_ui() from the MPI library for use by RSA signature verification as per RFC3447 section 5.2.2 step 1. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2012-10-08MPILIB: Provide count_leading/trailing_zeros() based on arch functionsDavid Howells
Provide count_leading/trailing_zeros() macros based on extant arch bit scanning functions rather than reimplementing from scratch in MPILIB. Whilst we're at it, turn count_foo_zeros(n, x) into n = count_foo_zeros(x). Also move the definition to asm-generic as other people may be interested in using it. Signed-off-by: David Howells <dhowells@redhat.com> Cc: David S. Miller <davem@davemloft.net> Cc: Dmitry Kasatkin <dmitry.kasatkin@intel.com> Cc: Arnd Bergmann <arnd@arndb.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2012-05-26Remove unused code from MPI libraryDmitry Kasatkin
MPI library is used by RSA verification implementation. Few files contains functions which are never called. James Morris has asked to remove all of them. Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com> Requested-by: James Morris <james.l.morris@oracle.com> Signed-off-by: James Morris <james.l.morris@oracle.com>
2012-05-26Revert "crypto: GnuPG based MPI lib - additional sources (part 4)"Dmitry Kasatkin
This reverts commit 7e8dec918ef8e0f68b4937c3c50fa57002077a4d. RSA verification implementation does not use this code. James Morris has asked to remove that. Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com> Requested-by: James Morris <james.l.morris@oracle.com> Signed-off-by: James Morris <james.l.morris@oracle.com>
2012-04-18mpi: Avoid using freed pointer in mpi_lshift_limbs()Jesper Juhl
At the start of the function we assign 'a->d' to 'ap'. Then we use the RESIZE_IF_NEEDED macro on 'a' - this may free 'a->d' and replace it with newly allocaetd storage. In that case, we'll be operating on freed memory further down in the function when we index into 'ap[]'. Since we don't actually need 'ap' until after the use of the RESIZE_IF_NEEDED macro we can just delay the assignment to it until after we've potentially resized, thus avoiding the issue. While I was there anyway I also changed the integer variable 'n' to be const. It might as well be since we only assign to it once and use it as a constant, and then the compiler will tell us if we ever assign to it in the future. Signed-off-by: Jesper Juhl <jj@chaosbits.net> Acked-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com> Signed-off-by: James Morris <james.l.morris@oracle.com>
2012-02-02lib: Fix 32-bit sparc udiv_qrnnd() definition in mpilib's longlong.hDavid Miller
This copy of longlong.h is extremely dated and results in compile errors on sparc32 when MPILIB is enabled, copy over the more uptodate implementation from arch/sparc/math/sfp-util_32.h Reported-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: James Morris <jmorris@namei.org>
2012-02-02lib: Fix multiple definitions of clz_tabDavid Miller
Both sparc 32-bit's software divide assembler and MPILIB provide clz_tab[] with identical contents. Break it out into a seperate object file and select it when SPARC32 or MPILIB is set. Reported-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: James Morris <jmorris@namei.org>
2012-02-02lib/mpi: added missing NULL checkDmitry Kasatkin
Added missing NULL check after mpi_alloc_limb_space(). Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com> Reviewed-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <jmorris@namei.org>
2012-02-02lib/mpi: added comment on divide by 0 caseDmitry Kasatkin
Comment explains that existing clients do not call this function with dsize == 0, which means that 1/0 should not happen. Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com> Reviewed-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <jmorris@namei.org>
2012-02-02lib/mpi: check for possible zero lengthDmitry Kasatkin
Buggy client might pass zero nlimbs which is meaningless. Added check for zero length. Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com> Reviewed-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <jmorris@namei.org>
2012-02-02lib/mpi: removed unused functionsDmitry Kasatkin
do_encode_md() and mpi_get_keyid() are not parts of mpi library. They were used early versions of gnupg and in digsig project, but they are not used neither here nor there anymore. Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com> Reviewed-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <jmorris@namei.org>
2012-02-02lib/mpi: checks for zero divisor lengthDmitry Kasatkin
Divisor length should not be 0. Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com> Reviewed-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <jmorris@namei.org>
2012-02-02lib/mpi: return error code on dividing by zeroDmitry Kasatkin
Definitely better to return error code than to divide by zero. Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com> Reviewed-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <jmorris@namei.org>
2012-02-02lib/mpi: replaced MPI_NULL with normal NULLDmitry Kasatkin
MPI_NULL is replaced with normal NULL. Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com> Reviewed-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <jmorris@namei.org>
2012-02-02lib/mpi: added missing NULL checkDmitry Kasatkin
Added missing NULL check after mpi_alloc(). Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com> Reviewed-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: James Morris <jmorris@namei.org>
2012-01-19MPILIB: Add a missing ENOMEM checkDavid Howells
Add a missing ENOMEM check. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Mimi Zohar <zohar@us.ibm.com> Signed-off-by: James Morris <jmorris@namei.org>
2011-12-08mpi/mpi-mpow: NULL dereference on allocation failureDan Carpenter
We can't call mpi_free() on the elements if the first kzalloc() fails. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com> Signed-off-by: James Morris <jmorris@namei.org>
2011-11-09crypto: GnuPG based MPI lib - additional sources (part 4)Dmitry Kasatkin
Adds the multi-precision-integer maths library which was originally taken from GnuPG and ported to the kernel by (among others) David Howells. This version is taken from Fedora kernel 2.6.32-71.14.1.el6. The difference is that checkpatch reported errors and warnings have been fixed. This library is used to implemenet RSA digital signature verification used in IMA/EVM integrity protection subsystem. Due to patch size limitation, the patch is divided into 4 parts. This code is unnecessary for RSA digital signature verification, but for completeness it is included here and can be compiled, if CONFIG_MPILIB_EXTRA is enabled. Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com>
2011-11-09crypto: GnuPG based MPI lib - make files (part 3)Dmitry Kasatkin
Adds the multi-precision-integer maths library which was originally taken from GnuPG and ported to the kernel by (among others) David Howells. This version is taken from Fedora kernel 2.6.32-71.14.1.el6. The difference is that checkpatch reported errors and warnings have been fixed. This library is used to implemenet RSA digital signature verification used in IMA/EVM integrity protection subsystem. Due to patch size limitation, the patch is divided into 4 parts. Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com>
2011-11-09crypto: GnuPG based MPI lib - header files (part 2)Dmitry Kasatkin
Adds the multi-precision-integer maths library which was originally taken from GnuPG and ported to the kernel by (among others) David Howells. This version is taken from Fedora kernel 2.6.32-71.14.1.el6. The difference is that checkpatch reported errors and warnings have been fixed. This library is used to implemenet RSA digital signature verification used in IMA/EVM integrity protection subsystem. Due to patch size limitation, the patch is divided into 4 parts. Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com>
2011-11-09crypto: GnuPG based MPI lib - source files (part 1)Dmitry Kasatkin
Adds the multi-precision-integer maths library which was originally taken from GnuPG and ported to the kernel by (among others) David Howells. This version is taken from Fedora kernel 2.6.32-71.14.1.el6. The difference is that checkpatch reported errors and warnings have been fixed. This library is used to implemenet RSA digital signature verification used in IMA/EVM integrity protection subsystem. Due to patch size limitation, the patch is divided into 4 parts. Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com>
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