From nobody Tue Dec 16 14:34:16 2025 Received: from devnull.danielhodges.dev (vps-2f6e086e.vps.ovh.us [135.148.138.8]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 70C57341040; Fri, 5 Dec 2025 17:40:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=135.148.138.8 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764956429; cv=none; b=FGXUmA9DfWJM662c7Me0HoZvzjMLjsFXP8Um9pz9ulVIWTjzhRT30XPDmedF9kH6vwpkmqqdc5d5tOFuO+jTOA7HbgjQJGegCKWgs7D7wljLfKEglPcf4f0c5ezzcKZOhZZrIR7LVm6UhyxAouHCmM+/cey5EeSNZ+bEQwgKMrA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764956429; c=relaxed/simple; bh=C79LJkVJls9DlmpOEN66nhgyRQkT+HWCWZ8ASZfSeqY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=kaWYlQH1f+XPuDclBKXoRCEIjhk8jAdz5yxRQyZCw0woTjcjMDUZ4CPDfS1Kxt2rql9FZzFYwYNZBgqZ1zvcVfeDCHSk53g1VHwBiaXly72XegRQdCBFxC7TbZAFHXWmsOx3dfqOmXoPjmGpc3ZTJclzafae+/fB458O1gxYMjY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=danielhodges.dev; spf=pass smtp.mailfrom=danielhodges.dev; dkim=pass (2048-bit key) header.d=danielhodges.dev header.i=@danielhodges.dev header.b=JwxejCwJ; dkim=permerror (0-bit key) header.d=danielhodges.dev header.i=@danielhodges.dev header.b=sjmP2N5W; arc=none smtp.client-ip=135.148.138.8 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=danielhodges.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=danielhodges.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=danielhodges.dev header.i=@danielhodges.dev header.b="JwxejCwJ"; dkim=permerror (0-bit key) header.d=danielhodges.dev header.i=@danielhodges.dev header.b="sjmP2N5W" DKIM-Signature: v=1; a=rsa-sha256; s=202510r; d=danielhodges.dev; c=relaxed/relaxed; h=Message-ID:Date:Subject:To:From; t=1764956364; bh=de5Cgh+qm/fEZLkzMZIwXEb z0LNQmq+/Xuc11Hm0Ck4=; b=JwxejCwJ1ThNryW0OK4n4fnS6wF5vq9TChGbunhSyYpP+zJUx7 AJJB6XakMJgvJixFX70mt9q1s+PKJNVK4sdfqzew4uT+6yRrXCzTQdvhNSJq3CgaQH9GWQ8SqNz BTgXOaHJ8KzrV5A66fjHUV6IZAdtbicUtebDhnm185YmPQJXvCINiIU5f+lWiF5UObHQ81QYGvf pCXviIHtzzr6TpZtTFzZtfSZHjI10UtoRjK8/DIaSPA3jko8L6psBjurGD8z61tJ0RQjOfuM8Cc 8itykqqYP+/CXrdx7vZBcaegYmiYYVYZraJxKyQCJls/OZSDZC+PxBjNFpNDoNiGl+g==; DKIM-Signature: v=1; a=ed25519-sha256; s=202510e; d=danielhodges.dev; c=relaxed/relaxed; h=Message-ID:Date:Subject:To:From; t=1764956364; bh=de5Cgh+qm/fEZLkzMZIwXEb z0LNQmq+/Xuc11Hm0Ck4=; b=sjmP2N5WxoJELwi+wYf3O7HW8dmKQQz2ni3aeI1Nyr+gx7vjpf xyVmZ1lCw7Hj1F2Rc72FooN+M85HtY1idZDw==; From: Daniel Hodges To: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, vadim.fedorenko@linux.dev Cc: martin.lau@linux.dev, eddyz87@gmail.com, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, herbert@gondor.apana.org.au, davem@davemloft.net, shuah@kernel.org, bpf@vger.kernel.org, linux-crypto@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Daniel Hodges Subject: [PATCH bpf-next v2 1/5] crypto: Add BPF hash algorithm type registration module Date: Fri, 5 Dec 2025 12:39:19 -0500 Message-ID: <20251205173923.31740-2-git@danielhodges.dev> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251205173923.31740-1-git@danielhodges.dev> References: <20251205173923.31740-1-git@danielhodges.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add bpf_crypto_shash module that registers a hash type with the BPF crypto infrastructure, enabling BPF programs to access kernel hash algorithms through a unified interface. Update the bpf_crypto_type interface with hash-specific callbacks: - alloc_tfm: Allocates crypto_shash context with proper descriptor size - free_tfm: Releases hash transform and context memory - has_algo: Checks algorithm availability via crypto_has_shash() - hash: Performs single-shot hashing via crypto_shash_digest() - digestsize: Returns the output size for the hash algorithm - get_flags: Exposes transform flags to BPF programs Update bpf_shash_ctx to contain crypto_shash transform and shash_desc descriptor to accommodate algorithm-specific descriptor requirements. Signed-off-by: Daniel Hodges --- crypto/Makefile | 3 ++ crypto/bpf_crypto_shash.c | 94 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 97 insertions(+) create mode 100644 crypto/bpf_crypto_shash.c diff --git a/crypto/Makefile b/crypto/Makefile index 16a35649dd91..853dff375906 100644 --- a/crypto/Makefile +++ b/crypto/Makefile @@ -30,6 +30,9 @@ obj-$(CONFIG_CRYPTO_ECHAINIV) +=3D echainiv.o crypto_hash-y +=3D ahash.o crypto_hash-y +=3D shash.o obj-$(CONFIG_CRYPTO_HASH2) +=3D crypto_hash.o +ifeq ($(CONFIG_BPF_SYSCALL),y) +obj-$(CONFIG_CRYPTO_HASH2) +=3D bpf_crypto_shash.o +endif =20 obj-$(CONFIG_CRYPTO_AKCIPHER2) +=3D akcipher.o obj-$(CONFIG_CRYPTO_SIG2) +=3D sig.o diff --git a/crypto/bpf_crypto_shash.c b/crypto/bpf_crypto_shash.c new file mode 100644 index 000000000000..39032e7dd602 --- /dev/null +++ b/crypto/bpf_crypto_shash.c @@ -0,0 +1,94 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include +#include +#include +#include + +struct bpf_shash_ctx { + struct crypto_shash *tfm; + struct shash_desc desc; +}; + +static void *bpf_crypto_shash_alloc_tfm(const char *algo) +{ + struct bpf_shash_ctx *ctx; + struct crypto_shash *tfm; + + tfm =3D crypto_alloc_shash(algo, 0, 0); + if (IS_ERR(tfm)) + return tfm; + + ctx =3D kzalloc(sizeof(*ctx) + crypto_shash_descsize(tfm), GFP_KERNEL); + if (!ctx) { + crypto_free_shash(tfm); + return ERR_PTR(-ENOMEM); + } + + ctx->tfm =3D tfm; + ctx->desc.tfm =3D tfm; + + return ctx; +} + +static void bpf_crypto_shash_free_tfm(void *tfm) +{ + struct bpf_shash_ctx *ctx =3D tfm; + + crypto_free_shash(ctx->tfm); + kfree(ctx); +} + +static int bpf_crypto_shash_has_algo(const char *algo) +{ + return crypto_has_shash(algo, 0, 0); +} + +static int bpf_crypto_shash_hash(void *tfm, const u8 *data, u8 *out, + unsigned int len) +{ + struct bpf_shash_ctx *ctx =3D tfm; + + return crypto_shash_digest(&ctx->desc, data, len, out); +} + +static unsigned int bpf_crypto_shash_digestsize(void *tfm) +{ + struct bpf_shash_ctx *ctx =3D tfm; + + return crypto_shash_digestsize(ctx->tfm); +} + +static u32 bpf_crypto_shash_get_flags(void *tfm) +{ + struct bpf_shash_ctx *ctx =3D tfm; + + return crypto_shash_get_flags(ctx->tfm); +} + +static const struct bpf_crypto_type bpf_crypto_shash_type =3D { + .alloc_tfm =3D bpf_crypto_shash_alloc_tfm, + .free_tfm =3D bpf_crypto_shash_free_tfm, + .has_algo =3D bpf_crypto_shash_has_algo, + .hash =3D bpf_crypto_shash_hash, + .digestsize =3D bpf_crypto_shash_digestsize, + .get_flags =3D bpf_crypto_shash_get_flags, + .owner =3D THIS_MODULE, + .name =3D "hash", +}; + +static int __init bpf_crypto_shash_init(void) +{ + return bpf_crypto_register_type(&bpf_crypto_shash_type); +} + +static void __exit bpf_crypto_shash_exit(void) +{ + int err =3D bpf_crypto_unregister_type(&bpf_crypto_shash_type); + + WARN_ON_ONCE(err); +} + +module_init(bpf_crypto_shash_init); +module_exit(bpf_crypto_shash_exit); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Hash algorithm support for BPF"); --=20 2.51.0