| Message ID | 20211223141113.1240679-1-Jason@zx2c4.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2,1/2] lib/crypto: blake2s: include as built-in | expand |
On Thu, 23 Dec 2021 at 15:11, Jason A. Donenfeld <Jason@zx2c4.com> wrote: > > In preparation for using blake2s in the RNG, we change the way that it > is wired-in to the build system. Instead of kconfig mazes and ifdefs, we > use weak symbols, so that an arch version can override the generic > version. Then we include the generic version in lib-y, so that it can be > removed from the image if the arch version doesn't fallback to it (as is > the case on arm though not x86). The result should be a bit simpler and > smaller than the code it replaces. > > Cc: Ard Biesheuvel <ardb@kernel.org> > Cc: Masahiro Yamada <masahiroy@kernel.org> > Cc: linux-kbuild@vger.kernel.org > Cc: Herbert Xu <herbert@gondor.apana.org.au> > Cc: linux-crypto@vger.kernel.org > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> > --- > Herbert - I intend to take this via the crng/random.git tree, since it > forms a dependency and I'd like to send a pull early in 5.17 cycle. > > Makefile | 2 +- > arch/arm/crypto/Kconfig | 3 +-- > arch/arm/crypto/blake2s-core.S | 8 ++++---- > arch/arm/crypto/blake2s-glue.c | 6 +++--- > arch/s390/configs/debug_defconfig | 1 - > arch/s390/configs/defconfig | 1 - You can drop these two hunks - not worth the risk of a conflict with the S390 tree. Other than that, Acked-by: Ard Biesheuvel <ardb@kernel.org> > arch/x86/crypto/blake2s-glue.c | 11 +++++------ > crypto/Kconfig | 5 +---- > drivers/net/Kconfig | 1 - > include/crypto/internal/blake2s.h | 6 +++--- > lib/Makefile | 2 +- > lib/crypto/Kconfig | 25 ------------------------- > lib/crypto/Makefile | 7 +++---- > lib/crypto/blake2s-generic.c | 6 +++++- > lib/crypto/blake2s.c | 6 ------ > 15 files changed, 27 insertions(+), 63 deletions(-) > > diff --git a/Makefile b/Makefile > index d85f1ff79f5c..892ea632ea63 100644 > --- a/Makefile > +++ b/Makefile > @@ -668,7 +668,7 @@ drivers-y := drivers/ sound/ > drivers-$(CONFIG_SAMPLES) += samples/ > drivers-$(CONFIG_NET) += net/ > drivers-y += virt/ > -libs-y := lib/ > +libs-y := lib/ lib/crypto/ > endif # KBUILD_EXTMOD > > # The all: target is the default when no target is given on the > diff --git a/arch/arm/crypto/Kconfig b/arch/arm/crypto/Kconfig > index 2b575792363e..47cb22645746 100644 > --- a/arch/arm/crypto/Kconfig > +++ b/arch/arm/crypto/Kconfig > @@ -63,8 +63,7 @@ config CRYPTO_SHA512_ARM > using optimized ARM assembler and NEON, when available. > > config CRYPTO_BLAKE2S_ARM > - tristate "BLAKE2s digest algorithm (ARM)" > - select CRYPTO_ARCH_HAVE_LIB_BLAKE2S > + bool "BLAKE2s digest algorithm (ARM)" > help > BLAKE2s digest algorithm optimized with ARM scalar instructions. This > is faster than the generic implementations of BLAKE2s and BLAKE2b, but > diff --git a/arch/arm/crypto/blake2s-core.S b/arch/arm/crypto/blake2s-core.S > index 86345751bbf3..df40e46601f1 100644 > --- a/arch/arm/crypto/blake2s-core.S > +++ b/arch/arm/crypto/blake2s-core.S > @@ -167,8 +167,8 @@ > .endm > > // > -// void blake2s_compress_arch(struct blake2s_state *state, > -// const u8 *block, size_t nblocks, u32 inc); > +// void blake2s_compress(struct blake2s_state *state, > +// const u8 *block, size_t nblocks, u32 inc); > // > // Only the first three fields of struct blake2s_state are used: > // u32 h[8]; (inout) > @@ -176,7 +176,7 @@ > // u32 f[2]; (in) > // > .align 5 > -ENTRY(blake2s_compress_arch) > +ENTRY(blake2s_compress) > push {r0-r2,r4-r11,lr} // keep this an even number > > .Lnext_block: > @@ -303,4 +303,4 @@ ENTRY(blake2s_compress_arch) > str r3, [r12], #4 > bne 1b > b .Lcopy_block_done > -ENDPROC(blake2s_compress_arch) > +ENDPROC(blake2s_compress) > diff --git a/arch/arm/crypto/blake2s-glue.c b/arch/arm/crypto/blake2s-glue.c > index f2cc1e5fc9ec..09d3a0cabd2c 100644 > --- a/arch/arm/crypto/blake2s-glue.c > +++ b/arch/arm/crypto/blake2s-glue.c > @@ -11,17 +11,17 @@ > #include <linux/module.h> > > /* defined in blake2s-core.S */ > -EXPORT_SYMBOL(blake2s_compress_arch); > +EXPORT_SYMBOL(blake2s_compress); > > static int crypto_blake2s_update_arm(struct shash_desc *desc, > const u8 *in, unsigned int inlen) > { > - return crypto_blake2s_update(desc, in, inlen, blake2s_compress_arch); > + return crypto_blake2s_update(desc, in, inlen, blake2s_compress); > } > > static int crypto_blake2s_final_arm(struct shash_desc *desc, u8 *out) > { > - return crypto_blake2s_final(desc, out, blake2s_compress_arch); > + return crypto_blake2s_final(desc, out, blake2s_compress); > } > > #define BLAKE2S_ALG(name, driver_name, digest_size) \ > diff --git a/arch/s390/configs/debug_defconfig b/arch/s390/configs/debug_defconfig > index e45cc27716de..caa3d1d6a0e8 100644 > --- a/arch/s390/configs/debug_defconfig > +++ b/arch/s390/configs/debug_defconfig > @@ -757,7 +757,6 @@ CONFIG_CRYPTO_USER_API_SKCIPHER=m > CONFIG_CRYPTO_USER_API_RNG=m > CONFIG_CRYPTO_USER_API_AEAD=m > CONFIG_CRYPTO_STATS=y > -CONFIG_CRYPTO_LIB_BLAKE2S=m > CONFIG_CRYPTO_LIB_CURVE25519=m > CONFIG_CRYPTO_LIB_CHACHA20POLY1305=m > CONFIG_ZCRYPT=m > diff --git a/arch/s390/configs/defconfig b/arch/s390/configs/defconfig > index 1c750bfca2d8..fffc6af5358c 100644 > --- a/arch/s390/configs/defconfig > +++ b/arch/s390/configs/defconfig > @@ -744,7 +744,6 @@ CONFIG_CRYPTO_USER_API_SKCIPHER=m > CONFIG_CRYPTO_USER_API_RNG=m > CONFIG_CRYPTO_USER_API_AEAD=m > CONFIG_CRYPTO_STATS=y > -CONFIG_CRYPTO_LIB_BLAKE2S=m > CONFIG_CRYPTO_LIB_CURVE25519=m > CONFIG_CRYPTO_LIB_CHACHA20POLY1305=m > CONFIG_ZCRYPT=m > diff --git a/arch/x86/crypto/blake2s-glue.c b/arch/x86/crypto/blake2s-glue.c > index a40365ab301e..ef91a3167d27 100644 > --- a/arch/x86/crypto/blake2s-glue.c > +++ b/arch/x86/crypto/blake2s-glue.c > @@ -28,9 +28,8 @@ asmlinkage void blake2s_compress_avx512(struct blake2s_state *state, > 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); > @@ -56,17 +55,17 @@ void blake2s_compress_arch(struct blake2s_state *state, > block += blocks * BLAKE2S_BLOCK_SIZE; > } while (nblocks); > } > -EXPORT_SYMBOL(blake2s_compress_arch); > +EXPORT_SYMBOL(blake2s_compress); > > 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); > + 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_arch); > + return crypto_blake2s_final(desc, out, blake2s_compress); > } > > #define BLAKE2S_ALG(name, driver_name, digest_size) \ > diff --git a/crypto/Kconfig b/crypto/Kconfig > index 285f82647d2b..bfda2c82774d 100644 > --- a/crypto/Kconfig > +++ b/crypto/Kconfig > @@ -685,7 +685,6 @@ config CRYPTO_BLAKE2B > > config CRYPTO_BLAKE2S > tristate "BLAKE2s digest algorithm" > - select CRYPTO_LIB_BLAKE2S_GENERIC > select CRYPTO_HASH > help > Implementation of cryptographic hash function BLAKE2s > @@ -702,10 +701,8 @@ config CRYPTO_BLAKE2S > See https://blake2.net for further information. > > config CRYPTO_BLAKE2S_X86 > - tristate "BLAKE2s digest algorithm (x86 accelerated version)" > + bool "BLAKE2s digest algorithm (x86 accelerated version)" > depends on X86 && 64BIT > - select CRYPTO_LIB_BLAKE2S_GENERIC > - select CRYPTO_ARCH_HAVE_LIB_BLAKE2S > > config CRYPTO_CRCT10DIF > tristate "CRCT10DIF algorithm" > diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig > index 6cccc3dc00bc..b2a4f998c180 100644 > --- a/drivers/net/Kconfig > +++ b/drivers/net/Kconfig > @@ -81,7 +81,6 @@ 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 > diff --git a/include/crypto/internal/blake2s.h b/include/crypto/internal/blake2s.h > index 8e50d487500f..d39cfa0d333e 100644 > --- 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); > > diff --git a/lib/Makefile b/lib/Makefile > index 364c23f15578..bb57b2e466fa 100644 > --- a/lib/Makefile > +++ b/lib/Makefile > @@ -139,7 +139,7 @@ endif > obj-$(CONFIG_DEBUG_INFO_REDUCED) += debug_info.o > CFLAGS_debug_info.o += $(call cc-option, -femit-struct-debug-detailed=any) > > -obj-y += math/ crypto/ > +obj-y += math/ > > obj-$(CONFIG_GENERIC_IOMAP) += iomap.o > obj-$(CONFIG_GENERIC_PCI_IOMAP) += pci_iomap.o > diff --git a/lib/crypto/Kconfig b/lib/crypto/Kconfig > index 545ccbddf6a1..31c6e2be3b84 100644 > --- a/lib/crypto/Kconfig > +++ b/lib/crypto/Kconfig > @@ -8,31 +8,6 @@ config CRYPTO_LIB_AES > config CRYPTO_LIB_ARC4 > tristate > > -config CRYPTO_ARCH_HAVE_LIB_BLAKE2S > - tristate > - help > - Declares whether the architecture provides an arch-specific > - accelerated implementation of the Blake2s library interface, > - either builtin or as a module. > - > -config CRYPTO_LIB_BLAKE2S_GENERIC > - tristate > - help > - This symbol can be depended upon by arch implementations of the > - Blake2s library interface that require the generic code as a > - fallback, e.g., for SIMD implementations. If no arch specific > - implementation is enabled, this implementation serves the users > - of CRYPTO_LIB_BLAKE2S. > - > -config CRYPTO_LIB_BLAKE2S > - tristate "BLAKE2s hash function library" > - depends on CRYPTO_ARCH_HAVE_LIB_BLAKE2S || !CRYPTO_ARCH_HAVE_LIB_BLAKE2S > - select CRYPTO_LIB_BLAKE2S_GENERIC if CRYPTO_ARCH_HAVE_LIB_BLAKE2S=n > - help > - Enable the Blake2s library interface. This interface may be fulfilled > - by either the generic implementation or an arch-specific one, if one > - is available and enabled. > - > config CRYPTO_ARCH_HAVE_LIB_CHACHA > tristate > help > diff --git a/lib/crypto/Makefile b/lib/crypto/Makefile > index 73205ed269ba..42e1d932c077 100644 > --- a/lib/crypto/Makefile > +++ b/lib/crypto/Makefile > @@ -10,10 +10,9 @@ libaes-y := aes.o > obj-$(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 > +# blake2s is used by the /dev/random driver which is always builtin > +lib-y += blake2s-generic.o > +obj-y += libblake2s.o > libblake2s-y += blake2s.o > > obj-$(CONFIG_CRYPTO_LIB_CHACHA20POLY1305) += libchacha20poly1305.o > diff --git a/lib/crypto/blake2s-generic.c b/lib/crypto/blake2s-generic.c > index 04ff8df24513..75ccb3e633e6 100644 > --- a/lib/crypto/blake2s-generic.c > +++ b/lib/crypto/blake2s-generic.c > @@ -37,7 +37,11 @@ static inline void blake2s_increment_counter(struct blake2s_state *state, > 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]; > diff --git a/lib/crypto/blake2s.c b/lib/crypto/blake2s.c > index 4055aa593ec4..93f2ae051370 100644 > --- 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); > -- > 2.34.1 >
On Thu, Dec 23, 2021 at 03:11:12PM +0100, Jason A. Donenfeld wrote: > In preparation for using blake2s in the RNG, we change the way that it > is wired-in to the build system. Instead of kconfig mazes and ifdefs, we > use weak symbols, so that an arch version can override the generic > version. Then we include the generic version in lib-y, so that it can be > removed from the image if the arch version doesn't fallback to it (as is > the case on arm though not x86). The result should be a bit simpler and > smaller than the code it replaces. > > Cc: Ard Biesheuvel <ardb@kernel.org> > Cc: Masahiro Yamada <masahiroy@kernel.org> > Cc: linux-kbuild@vger.kernel.org > Cc: Herbert Xu <herbert@gondor.apana.org.au> > Cc: linux-crypto@vger.kernel.org > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> > --- > Herbert - I intend to take this via the crng/random.git tree, since it > forms a dependency and I'd like to send a pull early in 5.17 cycle. > > Makefile | 2 +- > arch/arm/crypto/Kconfig | 3 +-- > arch/arm/crypto/blake2s-core.S | 8 ++++---- > arch/arm/crypto/blake2s-glue.c | 6 +++--- > arch/s390/configs/debug_defconfig | 1 - > arch/s390/configs/defconfig | 1 - > arch/x86/crypto/blake2s-glue.c | 11 +++++------ > crypto/Kconfig | 5 +---- > drivers/net/Kconfig | 1 - > include/crypto/internal/blake2s.h | 6 +++--- > lib/Makefile | 2 +- > lib/crypto/Kconfig | 25 ------------------------- > lib/crypto/Makefile | 7 +++---- > lib/crypto/blake2s-generic.c | 6 +++++- > lib/crypto/blake2s.c | 6 ------ > 15 files changed, 27 insertions(+), 63 deletions(-) Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
On Thu, Dec 23, 2021 at 11:11 PM Jason A. Donenfeld <Jason@zx2c4.com> wrote: > > In preparation for using blake2s in the RNG, we change the way that it > is wired-in to the build system. Instead of kconfig mazes and ifdefs, we > use weak symbols, so that an arch version can override the generic > version. Then we include the generic version in lib-y, so that it can be > removed from the image if the arch version doesn't fallback to it (as is > the case on arm though not x86). As I replied in another email, this does not work like that. Since 7273ad2b08f8ac9563579d16a3cf528857b26f49, libs-y are all linked when CONFIG_MODULES=y. So, what this patch is doing are: - Add __weak to the generic function - Make modules into built-in. Both generic functions and ARM-specific ones will remain in vmlinux. __weak makes it difficult to track which function is actually used. Using #ifdef CONFIG_* (as the current code does) is better. > > diff --git a/Makefile b/Makefile > index d85f1ff79f5c..892ea632ea63 100644 > --- a/Makefile > +++ b/Makefile > @@ -668,7 +668,7 @@ drivers-y := drivers/ sound/ > drivers-$(CONFIG_SAMPLES) += samples/ > drivers-$(CONFIG_NET) += net/ > drivers-y += virt/ > -libs-y := lib/ > +libs-y := lib/ lib/crypto/ If this is merged, someone will try to add random patterns. libs-y := lib/ lib/crypto/ lib/foo/bar/ lib/foo/ba/baz lib-y and libs-y are a bad idea in the first place and should not be extended any more. Since this patch is not working as the commit description claims, and it is going in the bad direction, so NACK
On Sat, 25 Dec 2021 at 10:28, Masahiro Yamada <masahiroy@kernel.org> wrote: > > On Thu, Dec 23, 2021 at 11:11 PM Jason A. Donenfeld <Jason@zx2c4.com> wrote: > > > > In preparation for using blake2s in the RNG, we change the way that it > > is wired-in to the build system. Instead of kconfig mazes and ifdefs, we > > use weak symbols, so that an arch version can override the generic > > version. Then we include the generic version in lib-y, so that it can be > > removed from the image if the arch version doesn't fallback to it (as is > > the case on arm though not x86). > > > As I replied in another email, this does not work like that. > > Since 7273ad2b08f8ac9563579d16a3cf528857b26f49, > libs-y are all linked when CONFIG_MODULES=y. > > > > So, what this patch is doing are: > > - Add __weak to the generic function > - Make modules into built-in. > > > Both generic functions and ARM-specific ones > will remain in vmlinux. > > __weak makes it difficult to track which function is > actually used. > Using #ifdef CONFIG_* (as the current code does) > is better. > > > > > > > diff --git a/Makefile b/Makefile > > index d85f1ff79f5c..892ea632ea63 100644 > > --- a/Makefile > > +++ b/Makefile > > @@ -668,7 +668,7 @@ drivers-y := drivers/ sound/ > > drivers-$(CONFIG_SAMPLES) += samples/ > > drivers-$(CONFIG_NET) += net/ > > drivers-y += virt/ > > -libs-y := lib/ > > +libs-y := lib/ lib/crypto/ > > > If this is merged, someone will try to > add random patterns. > libs-y := lib/ lib/crypto/ lib/foo/bar/ lib/foo/ba/baz > > > > lib-y and libs-y are a bad idea in the first place > and should not be extended any more. > > Since this patch is not working as the commit description > claims, and it is going in the bad direction, so > > NACK > So we are no longer permitted to use static libraries to provide routines that should only be pulled into vmlinux on demand? Has this also changed for things like string routines etc?
On Sat, Dec 25, 2021 at 7:26 PM Ard Biesheuvel <ardb@kernel.org> wrote: > > On Sat, 25 Dec 2021 at 10:28, Masahiro Yamada <masahiroy@kernel.org> wrote: > > > > On Thu, Dec 23, 2021 at 11:11 PM Jason A. Donenfeld <Jason@zx2c4.com> wrote: > > > > > > In preparation for using blake2s in the RNG, we change the way that it > > > is wired-in to the build system. Instead of kconfig mazes and ifdefs, we > > > use weak symbols, so that an arch version can override the generic > > > version. Then we include the generic version in lib-y, so that it can be > > > removed from the image if the arch version doesn't fallback to it (as is > > > the case on arm though not x86). > > > > > > As I replied in another email, this does not work like that. > > > > Since 7273ad2b08f8ac9563579d16a3cf528857b26f49, > > libs-y are all linked when CONFIG_MODULES=y. > > > > > > > > So, what this patch is doing are: > > > > - Add __weak to the generic function > > - Make modules into built-in. > > > > > > Both generic functions and ARM-specific ones > > will remain in vmlinux. > > > > __weak makes it difficult to track which function is > > actually used. > > Using #ifdef CONFIG_* (as the current code does) > > is better. > > > > > > > > > > > > diff --git a/Makefile b/Makefile > > > index d85f1ff79f5c..892ea632ea63 100644 > > > --- a/Makefile > > > +++ b/Makefile > > > @@ -668,7 +668,7 @@ drivers-y := drivers/ sound/ > > > drivers-$(CONFIG_SAMPLES) += samples/ > > > drivers-$(CONFIG_NET) += net/ > > > drivers-y += virt/ > > > -libs-y := lib/ > > > +libs-y := lib/ lib/crypto/ > > > > > > If this is merged, someone will try to > > add random patterns. > > libs-y := lib/ lib/crypto/ lib/foo/bar/ lib/foo/ba/baz > > > > > > > > lib-y and libs-y are a bad idea in the first place > > and should not be extended any more. > > > > Since this patch is not working as the commit description > > claims, and it is going in the bad direction, so > > > > NACK > > > > So we are no longer permitted to use static libraries to provide > routines that should only be pulled into vmlinux on demand? Has this > also changed for things like string routines etc? Utility functions such as string routines are intended to be used anywhere on demand, not only in vmlinux but also in loadable modules. Therefore, such functions are very likely to be EXPORT_SYMBOL'ed. As a matter of fact, most of the files listed in lib-y contain EXPORT_SYMBOL. Historically, static libraries did not work well with EXPORT_SYMBOL. Originally, lib-y dropped functions that had no callsite in vmlinux, but it was a wrong behavior. We must always keep exported functions, which might be used by modules, even if not by vmlinux. 7f2084fa55e6cb61f61b4224d4a8bafaeee55f9f added a workaround so that all of EXPORT_SYMBOL are considered "referenced". Since then, most of lib-y objects were linked anyway, given the following: - Most of *.c files listed in lib-y contain at least one EXPORT_SYMBOL - In static library, if any one of symbol is referenced, the entire object is linked So, lib-y was not helpful for reducing the kernel image size. The exceptional cases are CONFIG_MODULES=n or CONFIG_TRIM_UNUSED_KSYMS=y, but neither of them is a common use-case. To remove unused functions, CONFIG_LD_DEAD_CODE_DATA_ELIMINATION (per-symbol removal) seems to be a more sensible solution to me.
Hi Masahiro, Thanks for your feedback. Indeed it looks like you're right about the CONFIG_MODULE case. We'll go back to using the kconfig system normally, and cease tempting the beast with libs-y and such. I'll have a v+1 for you shortly in case you're curious, though I expect it to be sufficiently boring to be no longer worth your time :-). Jason
diff --git a/Makefile b/Makefile index d85f1ff79f5c..892ea632ea63 100644 --- a/Makefile +++ b/Makefile @@ -668,7 +668,7 @@ drivers-y := drivers/ sound/ drivers-$(CONFIG_SAMPLES) += samples/ drivers-$(CONFIG_NET) += net/ drivers-y += virt/ -libs-y := lib/ +libs-y := lib/ lib/crypto/ endif # KBUILD_EXTMOD # The all: target is the default when no target is given on the diff --git a/arch/arm/crypto/Kconfig b/arch/arm/crypto/Kconfig index 2b575792363e..47cb22645746 100644 --- a/arch/arm/crypto/Kconfig +++ b/arch/arm/crypto/Kconfig @@ -63,8 +63,7 @@ config CRYPTO_SHA512_ARM using optimized ARM assembler and NEON, when available. config CRYPTO_BLAKE2S_ARM - tristate "BLAKE2s digest algorithm (ARM)" - select CRYPTO_ARCH_HAVE_LIB_BLAKE2S + bool "BLAKE2s digest algorithm (ARM)" help BLAKE2s digest algorithm optimized with ARM scalar instructions. This is faster than the generic implementations of BLAKE2s and BLAKE2b, but diff --git a/arch/arm/crypto/blake2s-core.S b/arch/arm/crypto/blake2s-core.S index 86345751bbf3..df40e46601f1 100644 --- a/arch/arm/crypto/blake2s-core.S +++ b/arch/arm/crypto/blake2s-core.S @@ -167,8 +167,8 @@ .endm // -// void blake2s_compress_arch(struct blake2s_state *state, -// const u8 *block, size_t nblocks, u32 inc); +// void blake2s_compress(struct blake2s_state *state, +// const u8 *block, size_t nblocks, u32 inc); // // Only the first three fields of struct blake2s_state are used: // u32 h[8]; (inout) @@ -176,7 +176,7 @@ // u32 f[2]; (in) // .align 5 -ENTRY(blake2s_compress_arch) +ENTRY(blake2s_compress) push {r0-r2,r4-r11,lr} // keep this an even number .Lnext_block: @@ -303,4 +303,4 @@ ENTRY(blake2s_compress_arch) str r3, [r12], #4 bne 1b b .Lcopy_block_done -ENDPROC(blake2s_compress_arch) +ENDPROC(blake2s_compress) diff --git a/arch/arm/crypto/blake2s-glue.c b/arch/arm/crypto/blake2s-glue.c index f2cc1e5fc9ec..09d3a0cabd2c 100644 --- a/arch/arm/crypto/blake2s-glue.c +++ b/arch/arm/crypto/blake2s-glue.c @@ -11,17 +11,17 @@ #include <linux/module.h> /* defined in blake2s-core.S */ -EXPORT_SYMBOL(blake2s_compress_arch); +EXPORT_SYMBOL(blake2s_compress); static int crypto_blake2s_update_arm(struct shash_desc *desc, const u8 *in, unsigned int inlen) { - return crypto_blake2s_update(desc, in, inlen, blake2s_compress_arch); + return crypto_blake2s_update(desc, in, inlen, blake2s_compress); } static int crypto_blake2s_final_arm(struct shash_desc *desc, u8 *out) { - return crypto_blake2s_final(desc, out, blake2s_compress_arch); + return crypto_blake2s_final(desc, out, blake2s_compress); } #define BLAKE2S_ALG(name, driver_name, digest_size) \ diff --git a/arch/s390/configs/debug_defconfig b/arch/s390/configs/debug_defconfig index e45cc27716de..caa3d1d6a0e8 100644 --- a/arch/s390/configs/debug_defconfig +++ b/arch/s390/configs/debug_defconfig @@ -757,7 +757,6 @@ CONFIG_CRYPTO_USER_API_SKCIPHER=m CONFIG_CRYPTO_USER_API_RNG=m CONFIG_CRYPTO_USER_API_AEAD=m CONFIG_CRYPTO_STATS=y -CONFIG_CRYPTO_LIB_BLAKE2S=m CONFIG_CRYPTO_LIB_CURVE25519=m CONFIG_CRYPTO_LIB_CHACHA20POLY1305=m CONFIG_ZCRYPT=m diff --git a/arch/s390/configs/defconfig b/arch/s390/configs/defconfig index 1c750bfca2d8..fffc6af5358c 100644 --- a/arch/s390/configs/defconfig +++ b/arch/s390/configs/defconfig @@ -744,7 +744,6 @@ CONFIG_CRYPTO_USER_API_SKCIPHER=m CONFIG_CRYPTO_USER_API_RNG=m CONFIG_CRYPTO_USER_API_AEAD=m CONFIG_CRYPTO_STATS=y -CONFIG_CRYPTO_LIB_BLAKE2S=m CONFIG_CRYPTO_LIB_CURVE25519=m CONFIG_CRYPTO_LIB_CHACHA20POLY1305=m CONFIG_ZCRYPT=m diff --git a/arch/x86/crypto/blake2s-glue.c b/arch/x86/crypto/blake2s-glue.c index a40365ab301e..ef91a3167d27 100644 --- a/arch/x86/crypto/blake2s-glue.c +++ b/arch/x86/crypto/blake2s-glue.c @@ -28,9 +28,8 @@ asmlinkage void blake2s_compress_avx512(struct blake2s_state *state, 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); @@ -56,17 +55,17 @@ void blake2s_compress_arch(struct blake2s_state *state, block += blocks * BLAKE2S_BLOCK_SIZE; } while (nblocks); } -EXPORT_SYMBOL(blake2s_compress_arch); +EXPORT_SYMBOL(blake2s_compress); 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); + 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_arch); + return crypto_blake2s_final(desc, out, blake2s_compress); } #define BLAKE2S_ALG(name, driver_name, digest_size) \ diff --git a/crypto/Kconfig b/crypto/Kconfig index 285f82647d2b..bfda2c82774d 100644 --- a/crypto/Kconfig +++ b/crypto/Kconfig @@ -685,7 +685,6 @@ config CRYPTO_BLAKE2B config CRYPTO_BLAKE2S tristate "BLAKE2s digest algorithm" - select CRYPTO_LIB_BLAKE2S_GENERIC select CRYPTO_HASH help Implementation of cryptographic hash function BLAKE2s @@ -702,10 +701,8 @@ config CRYPTO_BLAKE2S See https://blake2.net for further information. config CRYPTO_BLAKE2S_X86 - tristate "BLAKE2s digest algorithm (x86 accelerated version)" + bool "BLAKE2s digest algorithm (x86 accelerated version)" depends on X86 && 64BIT - select CRYPTO_LIB_BLAKE2S_GENERIC - select CRYPTO_ARCH_HAVE_LIB_BLAKE2S config CRYPTO_CRCT10DIF tristate "CRCT10DIF algorithm" diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig index 6cccc3dc00bc..b2a4f998c180 100644 --- a/drivers/net/Kconfig +++ b/drivers/net/Kconfig @@ -81,7 +81,6 @@ 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 diff --git a/include/crypto/internal/blake2s.h b/include/crypto/internal/blake2s.h index 8e50d487500f..d39cfa0d333e 100644 --- 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); diff --git a/lib/Makefile b/lib/Makefile index 364c23f15578..bb57b2e466fa 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -139,7 +139,7 @@ endif obj-$(CONFIG_DEBUG_INFO_REDUCED) += debug_info.o CFLAGS_debug_info.o += $(call cc-option, -femit-struct-debug-detailed=any) -obj-y += math/ crypto/ +obj-y += math/ obj-$(CONFIG_GENERIC_IOMAP) += iomap.o obj-$(CONFIG_GENERIC_PCI_IOMAP) += pci_iomap.o diff --git a/lib/crypto/Kconfig b/lib/crypto/Kconfig index 545ccbddf6a1..31c6e2be3b84 100644 --- a/lib/crypto/Kconfig +++ b/lib/crypto/Kconfig @@ -8,31 +8,6 @@ config CRYPTO_LIB_AES config CRYPTO_LIB_ARC4 tristate -config CRYPTO_ARCH_HAVE_LIB_BLAKE2S - tristate - help - Declares whether the architecture provides an arch-specific - accelerated implementation of the Blake2s library interface, - either builtin or as a module. - -config CRYPTO_LIB_BLAKE2S_GENERIC - tristate - help - This symbol can be depended upon by arch implementations of the - Blake2s library interface that require the generic code as a - fallback, e.g., for SIMD implementations. If no arch specific - implementation is enabled, this implementation serves the users - of CRYPTO_LIB_BLAKE2S. - -config CRYPTO_LIB_BLAKE2S - tristate "BLAKE2s hash function library" - depends on CRYPTO_ARCH_HAVE_LIB_BLAKE2S || !CRYPTO_ARCH_HAVE_LIB_BLAKE2S - select CRYPTO_LIB_BLAKE2S_GENERIC if CRYPTO_ARCH_HAVE_LIB_BLAKE2S=n - help - Enable the Blake2s library interface. This interface may be fulfilled - by either the generic implementation or an arch-specific one, if one - is available and enabled. - config CRYPTO_ARCH_HAVE_LIB_CHACHA tristate help diff --git a/lib/crypto/Makefile b/lib/crypto/Makefile index 73205ed269ba..42e1d932c077 100644 --- a/lib/crypto/Makefile +++ b/lib/crypto/Makefile @@ -10,10 +10,9 @@ libaes-y := aes.o obj-$(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 +# blake2s is used by the /dev/random driver which is always builtin +lib-y += blake2s-generic.o +obj-y += libblake2s.o libblake2s-y += blake2s.o obj-$(CONFIG_CRYPTO_LIB_CHACHA20POLY1305) += libchacha20poly1305.o diff --git a/lib/crypto/blake2s-generic.c b/lib/crypto/blake2s-generic.c index 04ff8df24513..75ccb3e633e6 100644 --- a/lib/crypto/blake2s-generic.c +++ b/lib/crypto/blake2s-generic.c @@ -37,7 +37,11 @@ static inline void blake2s_increment_counter(struct blake2s_state *state, 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]; diff --git a/lib/crypto/blake2s.c b/lib/crypto/blake2s.c index 4055aa593ec4..93f2ae051370 100644 --- 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);
In preparation for using blake2s in the RNG, we change the way that it is wired-in to the build system. Instead of kconfig mazes and ifdefs, we use weak symbols, so that an arch version can override the generic version. Then we include the generic version in lib-y, so that it can be removed from the image if the arch version doesn't fallback to it (as is the case on arm though not x86). The result should be a bit simpler and smaller than the code it replaces. Cc: Ard Biesheuvel <ardb@kernel.org> Cc: Masahiro Yamada <masahiroy@kernel.org> Cc: linux-kbuild@vger.kernel.org Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: linux-crypto@vger.kernel.org Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> --- Herbert - I intend to take this via the crng/random.git tree, since it forms a dependency and I'd like to send a pull early in 5.17 cycle. Makefile | 2 +- arch/arm/crypto/Kconfig | 3 +-- arch/arm/crypto/blake2s-core.S | 8 ++++---- arch/arm/crypto/blake2s-glue.c | 6 +++--- arch/s390/configs/debug_defconfig | 1 - arch/s390/configs/defconfig | 1 - arch/x86/crypto/blake2s-glue.c | 11 +++++------ crypto/Kconfig | 5 +---- drivers/net/Kconfig | 1 - include/crypto/internal/blake2s.h | 6 +++--- lib/Makefile | 2 +- lib/crypto/Kconfig | 25 ------------------------- lib/crypto/Makefile | 7 +++---- lib/crypto/blake2s-generic.c | 6 +++++- lib/crypto/blake2s.c | 6 ------ 15 files changed, 27 insertions(+), 63 deletions(-)