target/linux/generic/backport-5.4/080-wireguard-0045-crypto-curve25519-Fix-selftest-build-error.patch

   1 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
   2 From: Herbert Xu <herbert@gondor.apana.org.au>
   3 Date: Wed, 8 Jan 2020 12:37:35 +0800
   4 Subject: [PATCH] crypto: curve25519 - Fix selftest build error
   5
   6 commit a8bdf2c42ee4d1ee42af1f3601f85de94e70a421 upstream.
   7
   8 If CRYPTO_CURVE25519 is y, CRYPTO_LIB_CURVE25519_GENERIC will be
   9 y, but CRYPTO_LIB_CURVE25519 may be set to m, this causes build
  10 errors:
  11
  12 lib/crypto/curve25519-selftest.o: In function `curve25519':
  13 curve25519-selftest.c:(.text.unlikely+0xc): undefined reference to `curve25519_arch'
  14 lib/crypto/curve25519-selftest.o: In function `curve25519_selftest':
  15 curve25519-selftest.c:(.init.text+0x17e): undefined reference to `curve25519_base_arch'
  16
  17 This is because the curve25519 self-test code is being controlled
  18 by the GENERIC option rather than the overall CURVE25519 option,
  19 as is the case with blake2s.  To recap, the GENERIC and ARCH options
  20 for CURVE25519 are internal only and selected by users such as
  21 the Crypto API, or the externally visible CURVE25519 option which
  22 in turn is selected by wireguard.  The self-test is specific to the
  23 the external CURVE25519 option and should not be enabled by the
  24 Crypto API.
  25
  26 This patch fixes this by splitting the GENERIC module from the
  27 CURVE25519 module with the latter now containing just the self-test.
  28
  29 Reported-by: Hulk Robot <hulkci@huawei.com>
  30 Fixes: aa127963f1ca ("crypto: lib/curve25519 - re-add selftests")
  31 Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
  32 Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
  33 Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
  34 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
  35 ---
  36  lib/crypto/Makefile             |  9 ++++++---
  37  lib/crypto/curve25519-generic.c | 24 ++++++++++++++++++++++++
  38  lib/crypto/curve25519.c         |  7 -------
  39  3 files changed, 30 insertions(+), 10 deletions(-)
  40  create mode 100644 lib/crypto/curve25519-generic.c
  41
  42 --- a/lib/crypto/Makefile
  43 +++ b/lib/crypto/Makefile
  44 @@ -19,9 +19,12 @@ libblake2s-y                                 += blake2s.o
  45  obj-$(CONFIG_CRYPTO_LIB_CHACHA20POLY1305)      += libchacha20poly1305.o
  46  libchacha20poly1305-y                          += chacha20poly1305.o
  47
  48 -obj-$(CONFIG_CRYPTO_LIB_CURVE25519_GENERIC)    += libcurve25519.o
  49 -libcurve25519-y                                        := curve25519-fiat32.o
  50 -libcurve25519-$(CONFIG_ARCH_SUPPORTS_INT128)   := curve25519-hacl64.o
  51 +obj-$(CONFIG_CRYPTO_LIB_CURVE25519_GENERIC)    += libcurve25519-generic.o
  52 +libcurve25519-generic-y                                := curve25519-fiat32.o
  53 +libcurve25519-generic-$(CONFIG_ARCH_SUPPORTS_INT128)   := curve25519-hacl64.o
  54 +libcurve25519-generic-y                                += curve25519-generic.o
  55 +
  56 +obj-$(CONFIG_CRYPTO_LIB_CURVE25519)            += libcurve25519.o
  57  libcurve25519-y                                        += curve25519.o
  58
  59  obj-$(CONFIG_CRYPTO_LIB_DES)                   += libdes.o
  60 --- /dev/null
  61 +++ b/lib/crypto/curve25519-generic.c
  62 @@ -0,0 +1,24 @@
  63 +// SPDX-License-Identifier: GPL-2.0 OR MIT
  64 +/*
  65 + * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
  66 + *
  67 + * This is an implementation of the Curve25519 ECDH algorithm, using either
  68 + * a 32-bit implementation or a 64-bit implementation with 128-bit integers,
  69 + * depending on what is supported by the target compiler.
  70 + *
  71 + * Information: https://cr.yp.to/ecdh.html
  72 + */
  73 +
  74 +#include <crypto/curve25519.h>
  75 +#include <linux/module.h>
  76 +
  77 +const u8 curve25519_null_point[CURVE25519_KEY_SIZE] __aligned(32) = { 0 };
  78 +const u8 curve25519_base_point[CURVE25519_KEY_SIZE] __aligned(32) = { 9 };
  79 +
  80 +EXPORT_SYMBOL(curve25519_null_point);
  81 +EXPORT_SYMBOL(curve25519_base_point);
  82 +EXPORT_SYMBOL(curve25519_generic);
  83 +
  84 +MODULE_LICENSE("GPL v2");
  85 +MODULE_DESCRIPTION("Curve25519 scalar multiplication");
  86 +MODULE_AUTHOR("Jason A. Donenfeld <Jason@zx2c4.com>");
  87 --- a/lib/crypto/curve25519.c
  88 +++ b/lib/crypto/curve25519.c
  89 @@ -15,13 +15,6 @@
  90
  91  bool curve25519_selftest(void);
  92
  93 -const u8 curve25519_null_point[CURVE25519_KEY_SIZE] __aligned(32) = { 0 };
  94 -const u8 curve25519_base_point[CURVE25519_KEY_SIZE] __aligned(32) = { 9 };
  95 -
  96 -EXPORT_SYMBOL(curve25519_null_point);
  97 -EXPORT_SYMBOL(curve25519_base_point);
  98 -EXPORT_SYMBOL(curve25519_generic);
  99 -
 100  static int __init mod_init(void)
 101  {
 102         if (!IS_ENABLED(CONFIG_CRYPTO_MANAGER_DISABLE_TESTS) &&