[PATCH 5.10 012/163] random: remove dead code left over from blocking pool

[PATCH 5.10 012/163] random: remove dead code left over from blocking pool

[Greg Kroah-Hartman]

From: Eric Biggers <ebiggers@google.com>

commit 118a4417e14348b2e46f5e467da8444ec4757a45 upstream.

Remove some dead code that was left over following commit 90ea1c6436d2
("random: remove the blocking pool").

Cc: linux-crypto@vger.kernel.org
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Jann Horn <jannh@google.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/char/random.c         |   17 +-------
 include/trace/events/random.h |   83 ------------------------------------------
 2 files changed, 3 insertions(+), 97 deletions(-)

--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -501,7 +501,6 @@ struct entropy_store {
 	unsigned short add_ptr;
 	unsigned short input_rotate;
 	int entropy_count;
-	unsigned int initialized:1;
 	unsigned int last_data_init:1;
 	__u8 last_data[EXTRACT_SIZE];
 };
@@ -661,7 +660,7 @@ static void process_random_ready_list(vo
  */
 static void credit_entropy_bits(struct entropy_store *r, int nbits)
 {
-	int entropy_count, orig, has_initialized = 0;
+	int entropy_count, orig;
 	const int pool_size = r->poolinfo->poolfracbits;
 	int nfrac = nbits << ENTROPY_SHIFT;
 
@@ -718,23 +717,14 @@ retry:
 	if (cmpxchg(&r->entropy_count, orig, entropy_count) != orig)
 		goto retry;
 
-	if (has_initialized) {
-		r->initialized = 1;
-		kill_fasync(&fasync, SIGIO, POLL_IN);
-	}
-
 	trace_credit_entropy_bits(r->name, nbits,
 				  entropy_count >> ENTROPY_SHIFT, _RET_IP_);
 
 	if (r == &input_pool) {
 		int entropy_bits = entropy_count >> ENTROPY_SHIFT;
 
-		if (crng_init < 2) {
-			if (entropy_bits < 128)
-				return;
+		if (crng_init < 2 && entropy_bits >= 128)
 			crng_reseed(&primary_crng, r);
-			entropy_bits = ENTROPY_BITS(r);
-		}
 	}
 }
 
@@ -1392,8 +1382,7 @@ retry:
 }
 
 /*
- * This function does the actual extraction for extract_entropy and
- * extract_entropy_user.
+ * This function does the actual extraction for extract_entropy.
  *
  * Note: we assume that .poolwords is a multiple of 16 words.
  */
--- a/include/trace/events/random.h
+++ b/include/trace/events/random.h
@@ -85,28 +85,6 @@ TRACE_EVENT(credit_entropy_bits,
 		  __entry->entropy_count, (void *)__entry->IP)
 );
 
-TRACE_EVENT(push_to_pool,
-	TP_PROTO(const char *pool_name, int pool_bits, int input_bits),
-
-	TP_ARGS(pool_name, pool_bits, input_bits),
-
-	TP_STRUCT__entry(
-		__field( const char *,	pool_name		)
-		__field(	  int,	pool_bits		)
-		__field(	  int,	input_bits		)
-	),
-
-	TP_fast_assign(
-		__entry->pool_name	= pool_name;
-		__entry->pool_bits	= pool_bits;
-		__entry->input_bits	= input_bits;
-	),
-
-	TP_printk("%s: pool_bits %d input_pool_bits %d",
-		  __entry->pool_name, __entry->pool_bits,
-		  __entry->input_bits)
-);
-
 TRACE_EVENT(debit_entropy,
 	TP_PROTO(const char *pool_name, int debit_bits),
 
@@ -161,35 +139,6 @@ TRACE_EVENT(add_disk_randomness,
 		  MINOR(__entry->dev), __entry->input_bits)
 );
 
-TRACE_EVENT(xfer_secondary_pool,
-	TP_PROTO(const char *pool_name, int xfer_bits, int request_bits,
-		 int pool_entropy, int input_entropy),
-
-	TP_ARGS(pool_name, xfer_bits, request_bits, pool_entropy,
-		input_entropy),
-
-	TP_STRUCT__entry(
-		__field( const char *,	pool_name		)
-		__field(	  int,	xfer_bits		)
-		__field(	  int,	request_bits		)
-		__field(	  int,	pool_entropy		)
-		__field(	  int,	input_entropy		)
-	),
-
-	TP_fast_assign(
-		__entry->pool_name	= pool_name;
-		__entry->xfer_bits	= xfer_bits;
-		__entry->request_bits	= request_bits;
-		__entry->pool_entropy	= pool_entropy;
-		__entry->input_entropy	= input_entropy;
-	),
-
-	TP_printk("pool %s xfer_bits %d request_bits %d pool_entropy %d "
-		  "input_entropy %d", __entry->pool_name, __entry->xfer_bits,
-		  __entry->request_bits, __entry->pool_entropy,
-		  __entry->input_entropy)
-);
-
 DECLARE_EVENT_CLASS(random__get_random_bytes,
 	TP_PROTO(int nbytes, unsigned long IP),
 
@@ -253,38 +202,6 @@ DEFINE_EVENT(random__extract_entropy, ex
 	TP_ARGS(pool_name, nbytes, entropy_count, IP)
 );
 
-DEFINE_EVENT(random__extract_entropy, extract_entropy_user,
-	TP_PROTO(const char *pool_name, int nbytes, int entropy_count,
-		 unsigned long IP),
-
-	TP_ARGS(pool_name, nbytes, entropy_count, IP)
-);
-
-TRACE_EVENT(random_read,
-	TP_PROTO(int got_bits, int need_bits, int pool_left, int input_left),
-
-	TP_ARGS(got_bits, need_bits, pool_left, input_left),
-
-	TP_STRUCT__entry(
-		__field(	  int,	got_bits		)
-		__field(	  int,	need_bits		)
-		__field(	  int,	pool_left		)
-		__field(	  int,	input_left		)
-	),
-
-	TP_fast_assign(
-		__entry->got_bits	= got_bits;
-		__entry->need_bits	= need_bits;
-		__entry->pool_left	= pool_left;
-		__entry->input_left	= input_left;
-	),
-
-	TP_printk("got_bits %d still_needed_bits %d "
-		  "blocking_pool_entropy_left %d input_entropy_left %d",
-		  __entry->got_bits, __entry->got_bits, __entry->pool_left,
-		  __entry->input_left)
-);
-
 TRACE_EVENT(urandom_read,
 	TP_PROTO(int got_bits, int pool_left, int input_left),
 

[PATCH 5.10 025/163] lib/crypto: blake2s: include as built-in

[Greg Kroah-Hartman]

From: "Jason A. Donenfeld" <Jason@zx2c4.com>

commit 6048fdcc5f269c7f31d774c295ce59081b36e6f9 upstream.

In preparation for using blake2s in the RNG, we change the way that it
is wired-in to the build system. Instead of using ifdefs to select the
right symbol, we use weak symbols. And because ARM doesn't need the
generic implementation, we make the generic one default only if an arch
library doesn't need it already, and then have arch libraries that do
need it opt-in. So that the arch libraries can remain tristate rather
than bool, we then split the shash part from the glue code.

Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: linux-kbuild@vger.kernel.org
Cc: linux-crypto@vger.kernel.org
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/x86/crypto/Makefile          |    4 +
 arch/x86/crypto/blake2s-glue.c    |   68 ++-------------------------------
 arch/x86/crypto/blake2s-shash.c   |   77 ++++++++++++++++++++++++++++++++++++++
 crypto/Kconfig                    |    3 -
 drivers/net/Kconfig               |    1 
 include/crypto/internal/blake2s.h |    6 +-
 lib/crypto/Kconfig                |   23 ++---------
 lib/crypto/Makefile               |    9 +---
 lib/crypto/blake2s-generic.c      |    6 ++
 lib/crypto/blake2s.c              |    6 --
 10 files changed, 106 insertions(+), 97 deletions(-)
 create mode 100644 arch/x86/crypto/blake2s-shash.c

--- a/arch/x86/crypto/Makefile
+++ b/arch/x86/crypto/Makefile
@@ -66,7 +66,9 @@ obj-$(CONFIG_CRYPTO_SHA512_SSSE3) += sha
 sha512-ssse3-y := sha512-ssse3-asm.o sha512-avx-asm.o sha512-avx2-asm.o sha512_ssse3_glue.o
 
 obj-$(CONFIG_CRYPTO_BLAKE2S_X86) += blake2s-x86_64.o
-blake2s-x86_64-y := blake2s-core.o blake2s-glue.o
+blake2s-x86_64-y := blake2s-shash.o
+obj-$(if $(CONFIG_CRYPTO_BLAKE2S_X86),y) += libblake2s-x86_64.o
+libblake2s-x86_64-y := blake2s-core.o blake2s-glue.o
 
 obj-$(CONFIG_CRYPTO_GHASH_CLMUL_NI_INTEL) += ghash-clmulni-intel.o
 ghash-clmulni-intel-y := ghash-clmulni-intel_asm.o ghash-clmulni-intel_glue.o
--- a/arch/x86/crypto/blake2s-glue.c
+++ b/arch/x86/crypto/blake2s-glue.c
@@ -5,7 +5,6 @@
 
 #include <crypto/internal/blake2s.h>
 #include <crypto/internal/simd.h>
-#include <crypto/internal/hash.h>
 
 #include <linux/types.h>
 #include <linux/jump_label.h>
@@ -28,9 +27,8 @@ asmlinkage void blake2s_compress_avx512(
 static __ro_after_init DEFINE_STATIC_KEY_FALSE(blake2s_use_ssse3);
 static __ro_after_init DEFINE_STATIC_KEY_FALSE(blake2s_use_avx512);
 
-void blake2s_compress_arch(struct blake2s_state *state,
-			   const u8 *block, size_t nblocks,
-			   const u32 inc)
+void blake2s_compress(struct blake2s_state *state, const u8 *block,
+		      size_t nblocks, const u32 inc)
 {
 	/* SIMD disables preemption, so relax after processing each page. */
 	BUILD_BUG_ON(SZ_4K / BLAKE2S_BLOCK_SIZE < 8);
@@ -56,49 +54,12 @@ void blake2s_compress_arch(struct blake2
 		block += blocks * BLAKE2S_BLOCK_SIZE;
 	} while (nblocks);
 }
-EXPORT_SYMBOL(blake2s_compress_arch);
-
-static int crypto_blake2s_update_x86(struct shash_desc *desc,
-				     const u8 *in, unsigned int inlen)
-{
-	return crypto_blake2s_update(desc, in, inlen, blake2s_compress_arch);
-}
-
-static int crypto_blake2s_final_x86(struct shash_desc *desc, u8 *out)
-{
-	return crypto_blake2s_final(desc, out, blake2s_compress_arch);
-}
-
-#define BLAKE2S_ALG(name, driver_name, digest_size)			\
-	{								\
-		.base.cra_name		= name,				\
-		.base.cra_driver_name	= driver_name,			\
-		.base.cra_priority	= 200,				\
-		.base.cra_flags		= CRYPTO_ALG_OPTIONAL_KEY,	\
-		.base.cra_blocksize	= BLAKE2S_BLOCK_SIZE,		\
-		.base.cra_ctxsize	= sizeof(struct blake2s_tfm_ctx), \
-		.base.cra_module	= THIS_MODULE,			\
-		.digestsize		= digest_size,			\
-		.setkey			= crypto_blake2s_setkey,	\
-		.init			= crypto_blake2s_init,		\
-		.update			= crypto_blake2s_update_x86,	\
-		.final			= crypto_blake2s_final_x86,	\
-		.descsize		= sizeof(struct blake2s_state),	\
-	}
-
-static struct shash_alg blake2s_algs[] = {
-	BLAKE2S_ALG("blake2s-128", "blake2s-128-x86", BLAKE2S_128_HASH_SIZE),
-	BLAKE2S_ALG("blake2s-160", "blake2s-160-x86", BLAKE2S_160_HASH_SIZE),
-	BLAKE2S_ALG("blake2s-224", "blake2s-224-x86", BLAKE2S_224_HASH_SIZE),
-	BLAKE2S_ALG("blake2s-256", "blake2s-256-x86", BLAKE2S_256_HASH_SIZE),
-};
+EXPORT_SYMBOL(blake2s_compress);
 
 static int __init blake2s_mod_init(void)
 {
-	if (!boot_cpu_has(X86_FEATURE_SSSE3))
-		return 0;
-
-	static_branch_enable(&blake2s_use_ssse3);
+	if (boot_cpu_has(X86_FEATURE_SSSE3))
+		static_branch_enable(&blake2s_use_ssse3);
 
 	if (IS_ENABLED(CONFIG_AS_AVX512) &&
 	    boot_cpu_has(X86_FEATURE_AVX) &&
@@ -109,26 +70,9 @@ static int __init blake2s_mod_init(void)
 			      XFEATURE_MASK_AVX512, NULL))
 		static_branch_enable(&blake2s_use_avx512);
 
-	return IS_REACHABLE(CONFIG_CRYPTO_HASH) ?
-		crypto_register_shashes(blake2s_algs,
-					ARRAY_SIZE(blake2s_algs)) : 0;
-}
-
-static void __exit blake2s_mod_exit(void)
-{
-	if (IS_REACHABLE(CONFIG_CRYPTO_HASH) && boot_cpu_has(X86_FEATURE_SSSE3))
-		crypto_unregister_shashes(blake2s_algs, ARRAY_SIZE(blake2s_algs));
+	return 0;
 }
 
 module_init(blake2s_mod_init);
-module_exit(blake2s_mod_exit);
 
-MODULE_ALIAS_CRYPTO("blake2s-128");
-MODULE_ALIAS_CRYPTO("blake2s-128-x86");
-MODULE_ALIAS_CRYPTO("blake2s-160");
-MODULE_ALIAS_CRYPTO("blake2s-160-x86");
-MODULE_ALIAS_CRYPTO("blake2s-224");
-MODULE_ALIAS_CRYPTO("blake2s-224-x86");
-MODULE_ALIAS_CRYPTO("blake2s-256");
-MODULE_ALIAS_CRYPTO("blake2s-256-x86");
 MODULE_LICENSE("GPL v2");
--- /dev/null
+++ b/arch/x86/crypto/blake2s-shash.c
@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: GPL-2.0 OR MIT
+/*
+ * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ */
+
+#include <crypto/internal/blake2s.h>
+#include <crypto/internal/simd.h>
+#include <crypto/internal/hash.h>
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sizes.h>
+
+#include <asm/cpufeature.h>
+#include <asm/processor.h>
+
+static int crypto_blake2s_update_x86(struct shash_desc *desc,
+				     const u8 *in, unsigned int inlen)
+{
+	return crypto_blake2s_update(desc, in, inlen, blake2s_compress);
+}
+
+static int crypto_blake2s_final_x86(struct shash_desc *desc, u8 *out)
+{
+	return crypto_blake2s_final(desc, out, blake2s_compress);
+}
+
+#define BLAKE2S_ALG(name, driver_name, digest_size)			\
+	{								\
+		.base.cra_name		= name,				\
+		.base.cra_driver_name	= driver_name,			\
+		.base.cra_priority	= 200,				\
+		.base.cra_flags		= CRYPTO_ALG_OPTIONAL_KEY,	\
+		.base.cra_blocksize	= BLAKE2S_BLOCK_SIZE,		\
+		.base.cra_ctxsize	= sizeof(struct blake2s_tfm_ctx), \
+		.base.cra_module	= THIS_MODULE,			\
+		.digestsize		= digest_size,			\
+		.setkey			= crypto_blake2s_setkey,	\
+		.init			= crypto_blake2s_init,		\
+		.update			= crypto_blake2s_update_x86,	\
+		.final			= crypto_blake2s_final_x86,	\
+		.descsize		= sizeof(struct blake2s_state),	\
+	}
+
+static struct shash_alg blake2s_algs[] = {
+	BLAKE2S_ALG("blake2s-128", "blake2s-128-x86", BLAKE2S_128_HASH_SIZE),
+	BLAKE2S_ALG("blake2s-160", "blake2s-160-x86", BLAKE2S_160_HASH_SIZE),
+	BLAKE2S_ALG("blake2s-224", "blake2s-224-x86", BLAKE2S_224_HASH_SIZE),
+	BLAKE2S_ALG("blake2s-256", "blake2s-256-x86", BLAKE2S_256_HASH_SIZE),
+};
+
+static int __init blake2s_mod_init(void)
+{
+	if (IS_REACHABLE(CONFIG_CRYPTO_HASH) && boot_cpu_has(X86_FEATURE_SSSE3))
+		return crypto_register_shashes(blake2s_algs, ARRAY_SIZE(blake2s_algs));
+	return 0;
+}
+
+static void __exit blake2s_mod_exit(void)
+{
+	if (IS_REACHABLE(CONFIG_CRYPTO_HASH) && boot_cpu_has(X86_FEATURE_SSSE3))
+		crypto_unregister_shashes(blake2s_algs, ARRAY_SIZE(blake2s_algs));
+}
+
+module_init(blake2s_mod_init);
+module_exit(blake2s_mod_exit);
+
+MODULE_ALIAS_CRYPTO("blake2s-128");
+MODULE_ALIAS_CRYPTO("blake2s-128-x86");
+MODULE_ALIAS_CRYPTO("blake2s-160");
+MODULE_ALIAS_CRYPTO("blake2s-160-x86");
+MODULE_ALIAS_CRYPTO("blake2s-224");
+MODULE_ALIAS_CRYPTO("blake2s-224-x86");
+MODULE_ALIAS_CRYPTO("blake2s-256");
+MODULE_ALIAS_CRYPTO("blake2s-256-x86");
+MODULE_LICENSE("GPL v2");
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -1936,9 +1936,10 @@ config CRYPTO_STATS
 config CRYPTO_HASH_INFO
 	bool
 
-source "lib/crypto/Kconfig"
 source "drivers/crypto/Kconfig"
 source "crypto/asymmetric_keys/Kconfig"
 source "certs/Kconfig"
 
 endif	# if CRYPTO
+
+source "lib/crypto/Kconfig"
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -80,7 +80,6 @@ config WIREGUARD
 	select CRYPTO
 	select CRYPTO_LIB_CURVE25519
 	select CRYPTO_LIB_CHACHA20POLY1305
-	select CRYPTO_LIB_BLAKE2S
 	select CRYPTO_CHACHA20_X86_64 if X86 && 64BIT
 	select CRYPTO_POLY1305_X86_64 if X86 && 64BIT
 	select CRYPTO_BLAKE2S_X86 if X86 && 64BIT
--- a/include/crypto/internal/blake2s.h
+++ b/include/crypto/internal/blake2s.h
@@ -11,11 +11,11 @@
 #include <crypto/internal/hash.h>
 #include <linux/string.h>
 
-void blake2s_compress_generic(struct blake2s_state *state,const u8 *block,
+void blake2s_compress_generic(struct blake2s_state *state, const u8 *block,
 			      size_t nblocks, const u32 inc);
 
-void blake2s_compress_arch(struct blake2s_state *state,const u8 *block,
-			   size_t nblocks, const u32 inc);
+void blake2s_compress(struct blake2s_state *state, const u8 *block,
+		      size_t nblocks, const u32 inc);
 
 bool blake2s_selftest(void);
 
--- a/lib/crypto/Kconfig
+++ b/lib/crypto/Kconfig
@@ -1,7 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
 
-comment "Crypto library routines"
-
 config CRYPTO_LIB_AES
 	tristate
 
@@ -9,14 +7,14 @@ config CRYPTO_LIB_ARC4
 	tristate
 
 config CRYPTO_ARCH_HAVE_LIB_BLAKE2S
-	tristate
+	bool
 	help
 	  Declares whether the architecture provides an arch-specific
 	  accelerated implementation of the Blake2s library interface,
 	  either builtin or as a module.
 
 config CRYPTO_LIB_BLAKE2S_GENERIC
-	tristate
+	def_bool !CRYPTO_ARCH_HAVE_LIB_BLAKE2S
 	help
 	  This symbol can be depended upon by arch implementations of the
 	  Blake2s library interface that require the generic code as a
@@ -24,15 +22,6 @@ config CRYPTO_LIB_BLAKE2S_GENERIC
 	  implementation is enabled, this implementation serves the users
 	  of CRYPTO_LIB_BLAKE2S.
 
-config CRYPTO_LIB_BLAKE2S
-	tristate "BLAKE2s hash function library"
-	depends on CRYPTO_ARCH_HAVE_LIB_BLAKE2S || !CRYPTO_ARCH_HAVE_LIB_BLAKE2S
-	select CRYPTO_LIB_BLAKE2S_GENERIC if CRYPTO_ARCH_HAVE_LIB_BLAKE2S=n
-	help
-	  Enable the Blake2s library interface. This interface may be fulfilled
-	  by either the generic implementation or an arch-specific one, if one
-	  is available and enabled.
-
 config CRYPTO_ARCH_HAVE_LIB_CHACHA
 	tristate
 	help
@@ -51,7 +40,7 @@ config CRYPTO_LIB_CHACHA_GENERIC
 	  of CRYPTO_LIB_CHACHA.
 
 config CRYPTO_LIB_CHACHA
-	tristate "ChaCha library interface"
+	tristate
 	depends on CRYPTO_ARCH_HAVE_LIB_CHACHA || !CRYPTO_ARCH_HAVE_LIB_CHACHA
 	select CRYPTO_LIB_CHACHA_GENERIC if CRYPTO_ARCH_HAVE_LIB_CHACHA=n
 	help
@@ -76,7 +65,7 @@ config CRYPTO_LIB_CURVE25519_GENERIC
 	  of CRYPTO_LIB_CURVE25519.
 
 config CRYPTO_LIB_CURVE25519
-	tristate "Curve25519 scalar multiplication library"
+	tristate
 	depends on CRYPTO_ARCH_HAVE_LIB_CURVE25519 || !CRYPTO_ARCH_HAVE_LIB_CURVE25519
 	select CRYPTO_LIB_CURVE25519_GENERIC if CRYPTO_ARCH_HAVE_LIB_CURVE25519=n
 	help
@@ -111,7 +100,7 @@ config CRYPTO_LIB_POLY1305_GENERIC
 	  of CRYPTO_LIB_POLY1305.
 
 config CRYPTO_LIB_POLY1305
-	tristate "Poly1305 library interface"
+	tristate
 	depends on CRYPTO_ARCH_HAVE_LIB_POLY1305 || !CRYPTO_ARCH_HAVE_LIB_POLY1305
 	select CRYPTO_LIB_POLY1305_GENERIC if CRYPTO_ARCH_HAVE_LIB_POLY1305=n
 	help
@@ -120,7 +109,7 @@ config CRYPTO_LIB_POLY1305
 	  is available and enabled.
 
 config CRYPTO_LIB_CHACHA20POLY1305
-	tristate "ChaCha20-Poly1305 AEAD support (8-byte nonce library version)"
+	tristate
 	depends on CRYPTO_ARCH_HAVE_LIB_CHACHA || !CRYPTO_ARCH_HAVE_LIB_CHACHA
 	depends on CRYPTO_ARCH_HAVE_LIB_POLY1305 || !CRYPTO_ARCH_HAVE_LIB_POLY1305
 	select CRYPTO_LIB_CHACHA
--- a/lib/crypto/Makefile
+++ b/lib/crypto/Makefile
@@ -10,11 +10,10 @@ libaes-y					:= aes.o
 obj-$(CONFIG_CRYPTO_LIB_ARC4)			+= libarc4.o
 libarc4-y					:= arc4.o
 
-obj-$(CONFIG_CRYPTO_LIB_BLAKE2S_GENERIC)	+= libblake2s-generic.o
-libblake2s-generic-y				+= blake2s-generic.o
-
-obj-$(CONFIG_CRYPTO_LIB_BLAKE2S)		+= libblake2s.o
-libblake2s-y					+= blake2s.o
+# blake2s is used by the /dev/random driver which is always builtin
+obj-y						+= libblake2s.o
+libblake2s-y					:= blake2s.o
+libblake2s-$(CONFIG_CRYPTO_LIB_BLAKE2S_GENERIC)	+= blake2s-generic.o
 
 obj-$(CONFIG_CRYPTO_LIB_CHACHA20POLY1305)	+= libchacha20poly1305.o
 libchacha20poly1305-y				+= chacha20poly1305.o
--- a/lib/crypto/blake2s-generic.c
+++ b/lib/crypto/blake2s-generic.c
@@ -37,7 +37,11 @@ static inline void blake2s_increment_cou
 	state->t[1] += (state->t[0] < inc);
 }
 
-void blake2s_compress_generic(struct blake2s_state *state,const u8 *block,
+void blake2s_compress(struct blake2s_state *state, const u8 *block,
+		      size_t nblocks, const u32 inc)
+		      __weak __alias(blake2s_compress_generic);
+
+void blake2s_compress_generic(struct blake2s_state *state, const u8 *block,
 			      size_t nblocks, const u32 inc)
 {
 	u32 m[16];
--- a/lib/crypto/blake2s.c
+++ b/lib/crypto/blake2s.c
@@ -16,12 +16,6 @@
 #include <linux/init.h>
 #include <linux/bug.h>
 
-#if IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_BLAKE2S)
-#  define blake2s_compress blake2s_compress_arch
-#else
-#  define blake2s_compress blake2s_compress_generic
-#endif
-
 void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen)
 {
 	__blake2s_update(state, in, inlen, blake2s_compress);

[PATCH 5.10 037/163] random: early initialization of ChaCha constants

[Greg Kroah-Hartman]

From: Dominik Brodowski <linux@dominikbrodowski.net>

commit 96562f286884e2db89c74215b199a1084b5fb7f7 upstream.

Previously, the ChaCha constants for the primary pool were only
initialized in crng_initialize_primary(), called by rand_initialize().
However, some randomness is actually extracted from the primary pool
beforehand, e.g. by kmem_cache_create(). Therefore, statically
initialize the ChaCha constants for the primary pool.

Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: <linux-crypto@vger.kernel.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/char/random.c   |    5 ++++-
 include/crypto/chacha.h |   15 +++++++++++----
 2 files changed, 15 insertions(+), 5 deletions(-)

--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -457,6 +457,10 @@ struct crng_state {
 
 static struct crng_state primary_crng = {
 	.lock = __SPIN_LOCK_UNLOCKED(primary_crng.lock),
+	.state[0] = CHACHA_CONSTANT_EXPA,
+	.state[1] = CHACHA_CONSTANT_ND_3,
+	.state[2] = CHACHA_CONSTANT_2_BY,
+	.state[3] = CHACHA_CONSTANT_TE_K,
 };
 
 /*
@@ -823,7 +827,6 @@ static void crng_initialize_secondary(st
 
 static void __init crng_initialize_primary(struct crng_state *crng)
 {
-	chacha_init_consts(crng->state);
 	_extract_entropy(&input_pool, &crng->state[4], sizeof(__u32) * 12, 0);
 	if (crng_init_try_arch_early(crng) && trust_cpu && crng_init < 2) {
 		invalidate_batched_entropy();
--- a/include/crypto/chacha.h
+++ b/include/crypto/chacha.h
@@ -47,12 +47,19 @@ static inline void hchacha_block(const u
 		hchacha_block_generic(state, out, nrounds);
 }
 
+enum chacha_constants { /* expand 32-byte k */
+	CHACHA_CONSTANT_EXPA = 0x61707865U,
+	CHACHA_CONSTANT_ND_3 = 0x3320646eU,
+	CHACHA_CONSTANT_2_BY = 0x79622d32U,
+	CHACHA_CONSTANT_TE_K = 0x6b206574U
+};
+
 static inline void chacha_init_consts(u32 *state)
 {
-	state[0]  = 0x61707865; /* "expa" */
-	state[1]  = 0x3320646e; /* "nd 3" */
-	state[2]  = 0x79622d32; /* "2-by" */
-	state[3]  = 0x6b206574; /* "te k" */
+	state[0]  = CHACHA_CONSTANT_EXPA;
+	state[1]  = CHACHA_CONSTANT_ND_3;
+	state[2]  = CHACHA_CONSTANT_2_BY;
+	state[3]  = CHACHA_CONSTANT_TE_K;
 }
 
 void chacha_init_arch(u32 *state, const u32 *key, const u8 *iv);