LinuxLists.cc - [PATCH bpf-next v6 1/3] bpf: make common crypto API for TC/XDP programs

2023-11-29 18:44:52

Subject: [PATCH bpf-next v6 1/3] bpf: make common crypto API for TC/XDP programs

Add crypto API support to BPF to be able to decrypt or encrypt packets
in TC/XDP BPF programs. Special care should be taken for initialization
part of crypto algo because crypto alloc) doesn't work with preemtion
disabled, it can be run only in sleepable BPF program. Also async crypto
is not supported because of the very same issue - TC/XDP BPF programs
are not sleepable.

Signed-off-by: Vadim Fedorenko <[email protected]>

---
v5 -> v6:
- replace lskcipher with infrastructure to provide pluggable cipher
types
- add BPF skcipher as plug-in module in a separate patch
v4 -> v5:
- replace crypto API to use lskcipher (suggested by Herbert Xu)
- remove SG list usage and provide raw buffers
v3 -> v4:
- reuse __bpf_dynptr_data and remove own implementation
- use const __str to provide algorithm name
- use kfunc macroses to avoid compilator warnings
v2 -> v3:
- fix kdoc issues
v1 -> v2:
- use kmalloc in sleepable func, suggested by Alexei
- use __bpf_dynptr_is_rdonly() to check destination, suggested by Jakub
- use __bpf_dynptr_data_ptr() for all dynptr accesses
---
include/linux/bpf.h | 1 +
include/linux/bpf_crypto.h | 23 +++
kernel/bpf/Makefile | 3 +
kernel/bpf/crypto.c | 364 +++++++++++++++++++++++++++++++++++++
kernel/bpf/helpers.c | 2 +-
kernel/bpf/verifier.c | 1 +
6 files changed, 393 insertions(+), 1 deletion(-)
create mode 100644 include/linux/bpf_crypto.h
create mode 100644 kernel/bpf/crypto.c

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index eb447b0a9423..0143ff6c93a1 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -1228,6 +1228,7 @@ int bpf_dynptr_check_size(u32 size);
u32 __bpf_dynptr_size(const struct bpf_dynptr_kern *ptr);
const void *__bpf_dynptr_data(const struct bpf_dynptr_kern *ptr, u32 len);
void *__bpf_dynptr_data_rw(const struct bpf_dynptr_kern *ptr, u32 len);
+bool __bpf_dynptr_is_rdonly(const struct bpf_dynptr_kern *ptr);

#ifdef CONFIG_BPF_JIT
int bpf_trampoline_link_prog(struct bpf_tramp_link *link, struct bpf_trampoline *tr);
diff --git a/include/linux/bpf_crypto.h b/include/linux/bpf_crypto.h
new file mode 100644
index 000000000000..e81bd8ab979c
--- /dev/null
+++ b/include/linux/bpf_crypto.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
+#ifndef _BPF_CRYPTO_H
+#define _BPF_CRYPTO_H
+
+struct bpf_crypto_type {
+ void *(*alloc_tfm)(const char *algo);
+ void (*free_tfm)(void *tfm);
+ int (*has_algo)(const char *algo);
+ int (*setkey)(void *tfm, const u8 *key, unsigned int keylen);
+ int (*setauthsize)(void *tfm, unsigned int authsize);
+ int (*encrypt)(void *tfm, const u8 *src, u8 *dst, unsigned int len, u8 *iv);
+ int (*decrypt)(void *tfm, const u8 *src, u8 *dst, unsigned int len, u8 *iv);
+ unsigned int (*ivsize)(void *tfm);
+ u32 (*get_flags)(void *tfm);
+ struct module *owner;
+ char name[14];
+};
+
+int bpf_crypto_register_type(const struct bpf_crypto_type *type);
+int bpf_crypto_unregister_type(const struct bpf_crypto_type *type);
+
+#endif /* _BPF_CRYPTO_H */
diff --git a/kernel/bpf/Makefile b/kernel/bpf/Makefile
index f526b7573e97..bcde762bb2c2 100644
--- a/kernel/bpf/Makefile
+++ b/kernel/bpf/Makefile
@@ -41,6 +41,9 @@ obj-$(CONFIG_BPF_SYSCALL) += bpf_struct_ops.o
obj-$(CONFIG_BPF_SYSCALL) += cpumask.o
obj-${CONFIG_BPF_LSM} += bpf_lsm.o
endif
+ifeq ($(CONFIG_CRYPTO),y)
+obj-$(CONFIG_BPF_SYSCALL) += crypto.o
+endif
obj-$(CONFIG_BPF_PRELOAD) += preload/

obj-$(CONFIG_BPF_SYSCALL) += relo_core.o
diff --git a/kernel/bpf/crypto.c b/kernel/bpf/crypto.c
new file mode 100644
index 000000000000..46b4d263e472
--- /dev/null
+++ b/kernel/bpf/crypto.c
@@ -0,0 +1,364 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (c) 2023 Meta, Inc */
+#include <linux/bpf.h>
+#include <linux/bpf_crypto.h>
+#include <linux/bpf_mem_alloc.h>
+#include <linux/btf.h>
+#include <linux/btf_ids.h>
+#include <linux/filter.h>
+#include <linux/scatterlist.h>
+#include <linux/skbuff.h>
+#include <crypto/skcipher.h>
+
+struct bpf_crypto_type_list {
+ const struct bpf_crypto_type *type;
+ struct list_head list;
+};
+
+static LIST_HEAD(bpf_crypto_types);
+static DECLARE_RWSEM(bpf_crypto_types_sem);
+
+/**
+ * struct bpf_crypto_ctx - refcounted BPF crypto context structure
+ * @type: The pointer to bpf crypto type
+ * @tfm: The pointer to instance of crypto API struct.
+ * @rcu: The RCU head used to free the crypto context with RCU safety.
+ * @usage: Object reference counter. When the refcount goes to 0, the
+ * memory is released back to the BPF allocator, which provides
+ * RCU safety.
+ */
+struct bpf_crypto_ctx {
+ const struct bpf_crypto_type *type;
+ void *tfm;
+ struct rcu_head rcu;
+ refcount_t usage;
+};
+
+int bpf_crypto_register_type(const struct bpf_crypto_type *type)
+{
+ struct bpf_crypto_type_list *node;
+ int err = -EEXIST;
+
+ down_write(&bpf_crypto_types_sem);
+ list_for_each_entry(node, &bpf_crypto_types, list) {
+ if (!strcmp(node->type->name, type->name))
+ goto unlock;
+ }
+
+ node = kmalloc(sizeof(*node), GFP_KERNEL);
+ err = -ENOMEM;
+ if (!node)
+ goto unlock;
+
+ node->type = type;
+ list_add(&node->list, &bpf_crypto_types);
+ err = 0;
+
+unlock:
+ up_write(&bpf_crypto_types_sem);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(bpf_crypto_register_type);
+
+int bpf_crypto_unregister_type(const struct bpf_crypto_type *type)
+{
+ struct bpf_crypto_type_list *node;
+ int err = -ENOENT;
+
+ down_write(&bpf_crypto_types_sem);
+ list_for_each_entry(node, &bpf_crypto_types, list) {
+ if (strcmp(node->type->name, type->name))
+ continue;
+
+ list_del(&node->list);
+ kfree(node);
+ err = 0;
+ break;
+ }
+ up_write(&bpf_crypto_types_sem);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(bpf_crypto_unregister_type);
+
+static const struct bpf_crypto_type *bpf_crypto_get_type(const char *name)
+{
+ const struct bpf_crypto_type *type = ERR_PTR(-ENOENT);
+ struct bpf_crypto_type_list *node;
+
+ down_read(&bpf_crypto_types_sem);
+ list_for_each_entry(node, &bpf_crypto_types, list) {
+ if (strcmp(node->type->name, name))
+ continue;
+
+ if (try_module_get(node->type->owner))
+ type = node->type;
+ break;
+ }
+ up_read(&bpf_crypto_types_sem);
+
+ return type;
+}
+
+__bpf_kfunc_start_defs();
+
+/**
+ * bpf_crypto_ctx_create() - Create a mutable BPF crypto context.
+ *
+ * Allocates a crypto context that can be used, acquired, and released by
+ * a BPF program. The crypto context returned by this function must either
+ * be embedded in a map as a kptr, or freed with bpf_crypto_ctx_release().
+ * As crypto API functions use GFP_KERNEL allocations, this function can
+ * only be used in sleepable BPF programs.
+ *
+ * bpf_crypto_ctx_create() allocates memory for crypto context.
+ * It may return NULL if no memory is available.
+ * @type__str: pointer to string representation of crypto type.
+ * @algo__str: pointer to string representation of algorithm.
+ * @pkey: bpf_dynptr which holds cipher key to do crypto.
+ * @err: integer to store error code when NULL is returned
+ */
+__bpf_kfunc struct bpf_crypto_ctx *
+bpf_crypto_ctx_create(const char *type__str, const char *algo__str,
+ const struct bpf_dynptr_kern *pkey,
+ unsigned int authsize, int *err)
+{
+ const struct bpf_crypto_type *type = bpf_crypto_get_type(type__str);
+ struct bpf_crypto_ctx *ctx;
+ const u8 *key;
+ u32 key_len;
+
+ //type = bpf_crypto_get_type(type__str);
+ if (IS_ERR(type)) {
+ *err = PTR_ERR(type);
+ return NULL;
+ }
+
+ if (!type->has_algo(algo__str)) {
+ *err = -EOPNOTSUPP;
+ goto err;
+ }
+
+ if (!authsize && type->setauthsize) {
+ *err = -EOPNOTSUPP;
+ goto err;
+ }
+
+ if (authsize && !type->setauthsize) {
+ *err = -EOPNOTSUPP;
+ goto err;
+ }
+
+ key_len = __bpf_dynptr_size(pkey);
+ if (!key_len) {
+ *err = -EINVAL;
+ goto err;
+ }
+ key = __bpf_dynptr_data(pkey, key_len);
+ if (!key) {
+ *err = -EINVAL;
+ goto err;
+ }
+
+ ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+ if (!ctx) {
+ *err = -ENOMEM;
+ goto err;
+ }
+
+ ctx->type = type;
+ ctx->tfm = type->alloc_tfm(algo__str);
+ if (IS_ERR(ctx->tfm)) {
+ *err = PTR_ERR(ctx->tfm);
+ ctx->tfm = NULL;
+ goto err;
+ }
+
+ if (authsize) {
+ *err = type->setauthsize(ctx->tfm, authsize;
+ if (*err)
+ goto err;
+ }
+
+ *err = type->setkey(ctx->tfm, key, key_len);
+ if (*err)
+ goto err;
+
+ refcount_set(&ctx->usage, 1);
+
+ return ctx;
+err:
+ if (ctx->tfm)
+ type->free_tfm(ctx->tfm);
+ kfree(ctx);
+ module_put(type->owner);
+
+ return NULL;
+}
+
+static void crypto_free_cb(struct rcu_head *head)
+{
+ struct bpf_crypto_ctx *ctx;
+
+ ctx = container_of(head, struct bpf_crypto_ctx, rcu);
+ ctx->type->free_tfm(ctx->tfm);
+ module_put(ctx->type->owner);
+ kfree(ctx);
+}
+
+/**
+ * bpf_crypto_ctx_acquire() - Acquire a reference to a BPF crypto context.
+ * @ctx: The BPF crypto context being acquired. The ctx must be a trusted
+ * pointer.
+ *
+ * Acquires a reference to a BPF crypto context. The context returned by this function
+ * must either be embedded in a map as a kptr, or freed with
+ * bpf_crypto_skcipher_ctx_release().
+ */
+__bpf_kfunc struct bpf_crypto_ctx *
+bpf_crypto_ctx_acquire(struct bpf_crypto_ctx *ctx)
+{
+ refcount_inc(&ctx->usage);
+ return ctx;
+}
+
+/**
+ * bpf_crypto_ctx_release() - Release a previously acquired BPF crypto context.
+ * @ctx: The crypto context being released.
+ *
+ * Releases a previously acquired reference to a BPF crypto context. When the final
+ * reference of the BPF crypto context has been released, it is subsequently freed in
+ * an RCU callback in the BPF memory allocator.
+ */
+__bpf_kfunc void bpf_crypto_ctx_release(struct bpf_crypto_ctx *ctx)
+{
+ if (refcount_dec_and_test(&ctx->usage))
+ call_rcu(&ctx->rcu, crypto_free_cb);
+}
+
+static int bpf_crypto_crypt(const struct bpf_crypto_ctx *ctx,
+ const struct bpf_dynptr_kern *src,
+ struct bpf_dynptr_kern *dst,
+ const struct bpf_dynptr_kern *iv,
+ bool decrypt)
+{
+ u32 src_len, dst_len, iv_len;
+ const u8 *psrc;
+ u8 *pdst, *piv;
+ int err;
+
+ if (ctx->type->get_flags(ctx->tfm) & CRYPTO_TFM_NEED_KEY)
+ return -EINVAL;
+
+ if (__bpf_dynptr_is_rdonly(dst))
+ return -EINVAL;
+
+ iv_len = __bpf_dynptr_size(iv);
+ src_len = __bpf_dynptr_size(src);
+ dst_len = __bpf_dynptr_size(dst);
+ if (!src_len || !dst_len)
+ return -EINVAL;
+
+ if (iv_len != ctx->type->ivsize(ctx->tfm))
+ return -EINVAL;
+
+ psrc = __bpf_dynptr_data(src, src_len);
+ if (!psrc)
+ return -EINVAL;
+ pdst = __bpf_dynptr_data_rw(dst, dst_len);
+ if (!pdst)
+ return -EINVAL;
+
+ piv = iv_len ? __bpf_dynptr_data_rw(iv, iv_len) : NULL;
+ if (iv_len && !piv)
+ return -EINVAL;
+
+ err = decrypt ? ctx->type->decrypt(ctx->tfm, psrc, pdst, src_len, piv)
+ : ctx->type->encrypt(ctx->tfm, psrc, pdst, src_len, piv);
+
+ return err;
+}
+
+/**
+ * bpf_crypto_decrypt() - Decrypt buffer using configured context and IV provided.
+ * @ctx: The crypto context being used. The ctx must be a trusted pointer.
+ * @src: bpf_dynptr to the encrypted data. Must be a trusted pointer.
+ * @dst: bpf_dynptr to the buffer where to store the result. Must be a trusted pointer.
+ * @iv: bpf_dynptr to IV data to be used by decryptor.
+ *
+ * Decrypts provided buffer using IV data and the crypto context. Crypto context must be configured.
+ */
+__bpf_kfunc int bpf_crypto_decrypt(struct bpf_crypto_ctx *ctx,
+ const struct bpf_dynptr_kern *src,
+ struct bpf_dynptr_kern *dst,
+ struct bpf_dynptr_kern *iv)
+{
+ return bpf_crypto_crypt(ctx, src, dst, iv, true);
+}
+
+/**
+ * bpf_crypto_encrypt() - Encrypt buffer using configured context and IV provided.
+ * @ctx: The crypto context being used. The ctx must be a trusted pointer.
+ * @src: bpf_dynptr to the plain data. Must be a trusted pointer.
+ * @dst: bpf_dynptr to buffer where to store the result. Must be a trusted pointer.
+ * @iv: bpf_dynptr to IV data to be used by decryptor.
+ *
+ * Encrypts provided buffer using IV data and the crypto context. Crypto context must be configured.
+ */
+__bpf_kfunc int bpf_crypto_encrypt(struct bpf_crypto_ctx *ctx,
+ const struct bpf_dynptr_kern *src,
+ struct bpf_dynptr_kern *dst,
+ struct bpf_dynptr_kern *iv)
+{
+ return bpf_crypto_crypt(ctx, src, dst, iv, false);
+}
+
+__bpf_kfunc_end_defs();
+
+BTF_SET8_START(crypt_init_kfunc_btf_ids)
+BTF_ID_FLAGS(func, bpf_crypto_ctx_create, KF_ACQUIRE | KF_RET_NULL | KF_SLEEPABLE)
+BTF_ID_FLAGS(func, bpf_crypto_ctx_release, KF_RELEASE)
+BTF_ID_FLAGS(func, bpf_crypto_ctx_acquire, KF_ACQUIRE | KF_TRUSTED_ARGS)
+BTF_SET8_END(crypt_init_kfunc_btf_ids)
+
+static const struct btf_kfunc_id_set crypt_init_kfunc_set = {
+ .owner = THIS_MODULE,
+ .set = &crypt_init_kfunc_btf_ids,
+};
+
+BTF_SET8_START(crypt_kfunc_btf_ids)
+BTF_ID_FLAGS(func, bpf_crypto_decrypt, KF_RCU)
+BTF_ID_FLAGS(func, bpf_crypto_encrypt, KF_RCU)
+BTF_SET8_END(crypt_kfunc_btf_ids)
+
+static const struct btf_kfunc_id_set crypt_kfunc_set = {
+ .owner = THIS_MODULE,
+ .set = &crypt_kfunc_btf_ids,
+};
+
+BTF_ID_LIST(bpf_crypto_dtor_ids)
+BTF_ID(struct, bpf_crypto_ctx)
+BTF_ID(func, bpf_crypto_ctx_release)
+
+static int __init crypto_kfunc_init(void)
+{
+ int ret;
+ const struct btf_id_dtor_kfunc bpf_crypto_dtors[] = {
+ {
+ .btf_id = bpf_crypto_dtor_ids[0],
+ .kfunc_btf_id = bpf_crypto_dtor_ids[1]
+ },
+ };
+
+ ret = register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, &crypt_kfunc_set);
+ ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_ACT, &crypt_kfunc_set);
+ ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_XDP, &crypt_kfunc_set);
+ ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_UNSPEC,
+ &crypt_init_kfunc_set);
+ return ret ?: register_btf_id_dtor_kfuncs(bpf_crypto_dtors,
+ ARRAY_SIZE(bpf_crypto_dtors),
+ THIS_MODULE);
+}
+
+late_initcall(crypto_kfunc_init);
diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index b45a8381f9bd..b73314c0124e 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -1436,7 +1436,7 @@ static const struct bpf_func_proto bpf_kptr_xchg_proto = {
#define DYNPTR_SIZE_MASK 0xFFFFFF
#define DYNPTR_RDONLY_BIT BIT(31)

-static bool __bpf_dynptr_is_rdonly(const struct bpf_dynptr_kern *ptr)
+bool __bpf_dynptr_is_rdonly(const struct bpf_dynptr_kern *ptr)
{
return ptr->size & DYNPTR_RDONLY_BIT;
}
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 8e7b6072e3f4..c54716966d5d 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -5162,6 +5162,7 @@ BTF_ID(struct, cgroup)
#endif
BTF_ID(struct, bpf_cpumask)
BTF_ID(struct, task_struct)
+BTF_ID(struct, bpf_crypto_ctx)
BTF_SET_END(rcu_protected_types)

static bool rcu_protected_object(const struct btf *btf, u32 btf_id)
--
2.39.3

2023-11-29 18:45:01

by Vadim Fedorenko

[permalink] [raw]

Subject: [PATCH bpf-next v6 2/3] bpf: crypto: add skcipher to bpf crypto

Implement skcipher crypto in BPF crypto framework.

Signed-off-by: Vadim Fedorenko <[email protected]>
---
v6:
- make skcipher implementation in separate patch
---
kernel/bpf/Makefile | 3 ++
kernel/bpf/crypto_skcipher.c | 76 ++++++++++++++++++++++++++++++++++++
2 files changed, 79 insertions(+)
create mode 100644 kernel/bpf/crypto_skcipher.c

diff --git a/kernel/bpf/Makefile b/kernel/bpf/Makefile
index bcde762bb2c2..f4827bb72bee 100644
--- a/kernel/bpf/Makefile
+++ b/kernel/bpf/Makefile
@@ -43,6 +43,9 @@ obj-${CONFIG_BPF_LSM} += bpf_lsm.o
endif
ifeq ($(CONFIG_CRYPTO),y)
obj-$(CONFIG_BPF_SYSCALL) += crypto.o
+ifeq ($(CONFIG_CRYPTO_SKCIPHER),y)
+obj-$(CONFIG_BPF_SYSCALL) += crypto_skcipher.o
+endif
endif
obj-$(CONFIG_BPF_PRELOAD) += preload/

diff --git a/kernel/bpf/crypto_skcipher.c b/kernel/bpf/crypto_skcipher.c
new file mode 100644
index 000000000000..d036eb64c1e2
--- /dev/null
+++ b/kernel/bpf/crypto_skcipher.c
@@ -0,0 +1,76 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (c) 2023 Meta, Inc */
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/bpf_crypto.h>
+#include <crypto/skcipher.h>
+
+static void *bpf_crypto_lskcipher_alloc_tfm(const char *algo)
+{
+ return crypto_alloc_lskcipher(algo, 0, 0);
+}
+
+static void bpf_crypto_lskcipher_free_tfm(void *tfm)
+{
+ crypto_free_lskcipher(tfm);
+}
+
+static int bpf_crypto_lskcipher_has_algo(const char *algo)
+{
+ return crypto_has_skcipher(algo, CRYPTO_ALG_TYPE_LSKCIPHER, CRYPTO_ALG_TYPE_MASK);
+}
+
+static int bpf_crypto_lskcipher_setkey(void *tfm, const u8 *key, unsigned int keylen)
+{
+ return crypto_lskcipher_setkey(tfm, key, keylen);
+}
+
+static u32 bpf_crypto_lskcipher_get_flags(void *tfm)
+{
+ return crypto_lskcipher_get_flags(tfm);
+}
+
+static unsigned int bpf_crypto_lskcipher_ivsize(void *tfm)
+{
+ return crypto_lskcipher_ivsize(tfm);
+}
+
+static int bpf_crypto_lskcipher_encrypt(void *tfm, const u8 *src, u8 *dst,
+ unsigned int len, u8 *iv)
+{
+ return crypto_lskcipher_encrypt(tfm, src, dst, len, iv);
+}
+
+static int bpf_crypto_lskcipher_decrypt(void *tfm, const u8 *src, u8 *dst,
+ unsigned int len, u8 *iv)
+{
+ return crypto_lskcipher_decrypt(tfm, src, dst, len, iv);
+}
+
+static const struct bpf_crypto_type bpf_crypto_lskcipher_type = {
+ .alloc_tfm = bpf_crypto_lskcipher_alloc_tfm,
+ .free_tfm = bpf_crypto_lskcipher_free_tfm,
+ .has_algo = bpf_crypto_lskcipher_has_algo,
+ .setkey = bpf_crypto_lskcipher_setkey,
+ .encrypt = bpf_crypto_lskcipher_encrypt,
+ .decrypt = bpf_crypto_lskcipher_decrypt,
+ .ivsize = bpf_crypto_lskcipher_ivsize,
+ .get_flags = bpf_crypto_lskcipher_get_flags,
+ .owner = THIS_MODULE,
+ .name = "skcipher",
+};
+
+static int __init bpf_crypto_skcipher_init(void)
+{
+ return bpf_crypto_register_type(&bpf_crypto_lskcipher_type);
+}
+
+static void __exit bpf_crypto_skcipher_exit(void)
+{
+ int err = bpf_crypto_unregister_type(&bpf_crypto_lskcipher_type);
+ WARN_ON_ONCE(err);
+}
+
+module_init(bpf_crypto_skcipher_init);
+module_exit(bpf_crypto_skcipher_exit);
+MODULE_LICENSE("GPL");
--
2.39.3

2023-11-29 18:45:18

by Vadim Fedorenko

[permalink] [raw]

Subject: [PATCH bpf-next v6 3/3] selftests: bpf: crypto skcipher algo selftests

Add simple tc hook selftests to show the way to work with new crypto
BPF API. Some weird structre and map are added to setup program to make
verifier happy about dynptr initialization from memory. Simple AES-ECB
algo is used to demonstrate encryption and decryption of fixed size
buffers.

Signed-off-by: Vadim Fedorenko <[email protected]>
---
v5 -> v6:
- use AF_ALG socket to confirm proper algorithm test
- adjust test kernel config to include AF_ALG
v4 -> v5:
- adjust selftests to use new naming
- restore tests on aarch64 and s390 as no sg lists are used
v3 -> v4:
- adjust selftests to use new syntax of helpers
- add tests for acquire and release
v2 -> v3:
- disable tests on s390 and aarch64 because of unknown Fatal exception
in sg_init_one
v1 -> v2:
- add CONFIG_CRYPTO_AES and CONFIG_CRYPTO_ECB to selftest build config
suggested by Daniel
---
tools/testing/selftests/bpf/config | 5 +
.../selftests/bpf/prog_tests/crypto_sanity.c | 215 ++++++++++++++++++
.../selftests/bpf/progs/crypto_common.h | 67 ++++++
.../selftests/bpf/progs/crypto_sanity.c | 192 ++++++++++++++++
4 files changed, 479 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/crypto_sanity.c
create mode 100644 tools/testing/selftests/bpf/progs/crypto_common.h
create mode 100644 tools/testing/selftests/bpf/progs/crypto_sanity.c

diff --git a/tools/testing/selftests/bpf/config b/tools/testing/selftests/bpf/config
index 3ec5927ec3e5..6963d6192975 100644
--- a/tools/testing/selftests/bpf/config
+++ b/tools/testing/selftests/bpf/config
@@ -13,7 +13,12 @@ CONFIG_BPF_SYSCALL=y
CONFIG_CGROUP_BPF=y
CONFIG_CRYPTO_HMAC=y
CONFIG_CRYPTO_SHA256=y
+CONFIG_CRYPTO_USER_API=y
CONFIG_CRYPTO_USER_API_HASH=y
+CONFIG_CRYPTO_USER_API_SKCIPHER=y
+CONFIG_CRYPTO_SKCIPHER=y
+CONFIG_CRYPTO_ECB=y
+CONFIG_CRYPTO_AES=y
CONFIG_DEBUG_INFO=y
CONFIG_DEBUG_INFO_BTF=y
CONFIG_DEBUG_INFO_DWARF4=y
diff --git a/tools/testing/selftests/bpf/prog_tests/crypto_sanity.c b/tools/testing/selftests/bpf/prog_tests/crypto_sanity.c
new file mode 100644
index 000000000000..2dd73cb248be
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/crypto_sanity.c
@@ -0,0 +1,215 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <net/if.h>
+#include <linux/in6.h>
+#include <linux/if_alg.h>
+
+#include "test_progs.h"
+#include "network_helpers.h"
+#include "crypto_sanity.skel.h"
+
+#define NS_TEST "crypto_sanity_ns"
+#define IPV6_IFACE_ADDR "face::1"
+#define UDP_TEST_PORT 7777
+static const unsigned char crypto_key[] = "testtest12345678";
+static const char plain_text[] = "stringtoencrypt0";
+static int opfd, tfmfd;
+
+int init_afalg(void)
+{
+ struct sockaddr_alg sa = {
+ .salg_family = AF_ALG,
+ .salg_type = "skcipher",
+ .salg_name = "ecb(aes)"
+ };
+
+ tfmfd = socket(AF_ALG, SOCK_SEQPACKET, 0);
+ if (tfmfd == -1)
+ return errno;
+ if (bind(tfmfd, (struct sockaddr *)&sa, sizeof(sa)) == -1)
+ return errno;
+ if (setsockopt(tfmfd, SOL_ALG, ALG_SET_KEY, crypto_key, 16) == -1)
+ return errno;
+ opfd = accept(tfmfd, NULL, 0);
+ if (opfd == -1)
+ return errno;
+ return 0;
+}
+
+void deinit_afalg(void)
+{
+ if (tfmfd)
+ close(tfmfd);
+ if (opfd)
+ close(opfd);
+}
+
+void do_crypt_afalg(const void *src, void *dst, int size, bool encrypt)
+{
+ struct msghdr msg = {};
+ struct cmsghdr *cmsg;
+ char cbuf[CMSG_SPACE(4)] = {0};
+ struct iovec iov;
+
+ msg.msg_control = cbuf;
+ msg.msg_controllen = sizeof(cbuf);
+
+ cmsg = CMSG_FIRSTHDR(&msg);
+ cmsg->cmsg_level = SOL_ALG;
+ cmsg->cmsg_type = ALG_SET_OP;
+ cmsg->cmsg_len = CMSG_LEN(4);
+ *(__u32 *)CMSG_DATA(cmsg) = encrypt ? ALG_OP_ENCRYPT : ALG_OP_DECRYPT;
+
+ iov.iov_base = (char *)src;
+ iov.iov_len = size;
+
+ msg.msg_iov = &iov;
+ msg.msg_iovlen = 1;
+
+ sendmsg(opfd, &msg, 0);
+ read(opfd, dst, size);
+}
+
+void test_crypto_sanity(void)
+{
+ LIBBPF_OPTS(bpf_tc_hook, qdisc_hook, .attach_point = BPF_TC_EGRESS);
+ LIBBPF_OPTS(bpf_tc_opts, tc_attach_enc);
+ LIBBPF_OPTS(bpf_tc_opts, tc_attach_dec);
+ LIBBPF_OPTS(bpf_test_run_opts, opts,
+ .repeat = 1,
+ );
+ struct nstoken *nstoken = NULL;
+ struct crypto_sanity *skel;
+ char afalg_plain[16] = {0};
+ char afalg_dst[16] = {0};
+ struct sockaddr_in6 addr;
+ int sockfd, err, pfd;
+ socklen_t addrlen;
+
+ skel = crypto_sanity__open();
+ if (!ASSERT_OK_PTR(skel, "skel open"))
+ return;
+
+ bpf_program__set_autoload(skel->progs.crypto_accuire, true);
+
+ err = crypto_sanity__load(skel);
+ if (!ASSERT_ERR(err, "crypto_accuire unexpected load success"))
+ goto fail;
+
+ crypto_sanity__destroy(skel);
+
+ skel = crypto_sanity__open();
+ if (!ASSERT_OK_PTR(skel, "skel open"))
+ return;
+
+ bpf_program__set_autoload(skel->progs.crypto_accuire, false);
+
+ SYS(fail, "ip netns add %s", NS_TEST);
+ SYS(fail, "ip -net %s -6 addr add %s/128 dev lo nodad", NS_TEST, IPV6_IFACE_ADDR);
+ SYS(fail, "ip -net %s link set dev lo up", NS_TEST);
+
+ err = crypto_sanity__load(skel);
+ if (!ASSERT_OK(err, "crypto_sanity__load"))
+ goto fail;
+
+ nstoken = open_netns(NS_TEST);
+ if (!ASSERT_OK_PTR(nstoken, "open_netns"))
+ goto fail;
+
+ err = init_afalg();
+ if (!ASSERT_OK(err, "AF_ALG init fail"))
+ goto fail;
+
+ qdisc_hook.ifindex = if_nametoindex("lo");
+ if (!ASSERT_GT(qdisc_hook.ifindex, 0, "if_nametoindex lo"))
+ goto fail;
+
+ err = crypto_sanity__attach(skel);
+ if (!ASSERT_OK(err, "crypto_sanity__attach"))
+ goto fail;
+
+ pfd = bpf_program__fd(skel->progs.crypto_release);
+ if (!ASSERT_GT(pfd, 0, "crypto_release fd"))
+ goto fail;
+
+ err = bpf_prog_test_run_opts(pfd, &opts);
+ if (!ASSERT_OK(err, "crypto_release") ||
+ !ASSERT_OK(opts.retval, "crypto_release retval"))
+ goto fail;
+
+ pfd = bpf_program__fd(skel->progs.skb_crypto_setup);
+ if (!ASSERT_GT(pfd, 0, "skb_crypto_setup fd"))
+ goto fail;
+
+ err = bpf_prog_test_run_opts(pfd, &opts);
+ if (!ASSERT_OK(err, "skb_crypto_setup") ||
+ !ASSERT_OK(opts.retval, "skb_crypto_setup retval"))
+ goto fail;
+
+ if (!ASSERT_OK(skel->bss->status, "skb_crypto_setup status"))
+ goto fail;
+
+ err = bpf_tc_hook_create(&qdisc_hook);
+ if (!ASSERT_OK(err, "create qdisc hook"))
+ goto fail;
+
+ addrlen = sizeof(addr);
+ err = make_sockaddr(AF_INET6, IPV6_IFACE_ADDR, UDP_TEST_PORT,
+ (void *)&addr, &addrlen);
+ if (!ASSERT_OK(err, "make_sockaddr"))
+ goto fail;
+
+ tc_attach_enc.prog_fd = bpf_program__fd(skel->progs.encrypt_sanity);
+ err = bpf_tc_attach(&qdisc_hook, &tc_attach_enc);
+ if (!ASSERT_OK(err, "attach encrypt filter"))
+ goto fail;
+
+ sockfd = socket(AF_INET6, SOCK_DGRAM, 0);
+ if (!ASSERT_NEQ(sockfd, -1, "encrypt socket"))
+ goto fail;
+ err = sendto(sockfd, plain_text, 16, 0, (void *)&addr, addrlen);
+ close(sockfd);
+ if (!ASSERT_EQ(err, 16, "encrypt send"))
+ goto fail;
+
+ do_crypt_afalg(plain_text, afalg_dst, 16, true);
+
+ bpf_tc_detach(&qdisc_hook, &tc_attach_enc);
+ if (!ASSERT_OK(skel->bss->status, "encrypt status"))
+ goto fail;
+ if (!ASSERT_STRNEQ(skel->bss->dst, afalg_dst, sizeof(afalg_dst), "encrypt AF_ALG"))
+ goto fail;
+
+ tc_attach_dec.prog_fd = bpf_program__fd(skel->progs.decrypt_sanity);
+ err = bpf_tc_attach(&qdisc_hook, &tc_attach_dec);
+ if (!ASSERT_OK(err, "attach decrypt filter"))
+ goto fail;
+
+ sockfd = socket(AF_INET6, SOCK_DGRAM, 0);
+ if (!ASSERT_NEQ(sockfd, -1, "decrypt socket"))
+ goto fail;
+ err = sendto(sockfd, afalg_dst, 16, 0, (void *)&addr, addrlen);
+ close(sockfd);
+ if (!ASSERT_EQ(err, 16, "decrypt send"))
+ goto fail;
+
+ do_crypt_afalg(afalg_dst, afalg_plain, 16, false);
+
+ bpf_tc_detach(&qdisc_hook, &tc_attach_dec);
+ if (!ASSERT_OK(skel->bss->status, "decrypt status"))
+ goto fail;
+ if (!ASSERT_STRNEQ(skel->bss->dst, afalg_plain, sizeof(afalg_plain), "decrypt AF_ALG"))
+ goto fail;
+
+fail:
+ if (nstoken) {
+ bpf_tc_hook_destroy(&qdisc_hook);
+ close_netns(nstoken);
+ }
+ deinit_afalg();
+ SYS_NOFAIL("ip netns del " NS_TEST " &> /dev/null");
+ crypto_sanity__destroy(skel);
+}
diff --git a/tools/testing/selftests/bpf/progs/crypto_common.h b/tools/testing/selftests/bpf/progs/crypto_common.h
new file mode 100644
index 000000000000..260b9a0fb4ed
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/crypto_common.h
@@ -0,0 +1,67 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
+
+#ifndef _CRYPTO_COMMON_H
+#define _CRYPTO_COMMON_H
+
+#include "errno.h"
+#include <stdbool.h>
+
+struct bpf_crypto_ctx *bpf_crypto_ctx_create(const char *type__str, const char *algo__str,
+ const struct bpf_dynptr *pkey,
+ unsigned int authsize, int *err) __ksym;
+struct bpf_crypto_ctx *bpf_crypto_ctx_acquire(struct bpf_crypto_ctx *ctx) __ksym;
+void bpf_crypto_ctx_release(struct bpf_crypto_ctx *ctx) __ksym;
+int bpf_crypto_encrypt(struct bpf_crypto_ctx *ctx, const struct bpf_dynptr *src,
+ struct bpf_dynptr *dst, struct bpf_dynptr *iv) __ksym;
+int bpf_crypto_decrypt(struct bpf_crypto_ctx *ctx, const struct bpf_dynptr *src,
+ struct bpf_dynptr *dst, struct bpf_dynptr *iv) __ksym;
+
+struct __crypto_ctx_value {
+ struct bpf_crypto_ctx __kptr * ctx;
+};
+
+struct array_map {
+ __uint(type, BPF_MAP_TYPE_ARRAY);
+ __type(key, int);
+ __type(value, struct __crypto_ctx_value);
+ __uint(max_entries, 1);
+} __crypto_ctx_map SEC(".maps");
+
+static inline struct __crypto_ctx_value *crypto_ctx_value_lookup(void)
+{
+ u32 key = 0;
+
+ return bpf_map_lookup_elem(&__crypto_ctx_map, &key);
+}
+
+static inline int crypto_ctx_insert(struct bpf_crypto_ctx *ctx)
+{
+ struct __crypto_ctx_value local, *v;
+ struct bpf_crypto_ctx *old;
+ u32 key = 0;
+ int err;
+
+ local.ctx = NULL;
+ err = bpf_map_update_elem(&__crypto_ctx_map, &key, &local, 0);
+ if (err) {
+ bpf_crypto_ctx_release(ctx);
+ return err;
+ }
+
+ v = bpf_map_lookup_elem(&__crypto_ctx_map, &key);
+ if (!v) {
+ bpf_crypto_ctx_release(ctx);
+ return -ENOENT;
+ }
+
+ old = bpf_kptr_xchg(&v->ctx, ctx);
+ if (old) {
+ bpf_crypto_ctx_release(old);
+ return -EEXIST;
+ }
+
+ return 0;
+}
+
+#endif /* _CRYPTO_COMMON_H */
diff --git a/tools/testing/selftests/bpf/progs/crypto_sanity.c b/tools/testing/selftests/bpf/progs/crypto_sanity.c
new file mode 100644
index 000000000000..f566ff189b7e
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/crypto_sanity.c
@@ -0,0 +1,192 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
+
+#include "vmlinux.h"
+#include "bpf_tracing_net.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_endian.h>
+#include <bpf/bpf_tracing.h>
+#include "bpf_misc.h"
+#include "bpf_kfuncs.h"
+#include "crypto_common.h"
+
+#define UDP_TEST_PORT 7777
+unsigned char crypto_key[16] = "testtest12345678";
+char dst[32] = {};
+int status;
+
+static int skb_dynptr_validate(struct __sk_buff *skb, struct bpf_dynptr *psrc)
+{
+ struct ipv6hdr ip6h;
+ struct udphdr udph;
+ u32 offset;
+
+ if (skb->protocol != __bpf_constant_htons(ETH_P_IPV6))
+ return -1;
+
+ if (bpf_skb_load_bytes(skb, ETH_HLEN, &ip6h, sizeof(ip6h)))
+ return -1;
+
+ if (ip6h.nexthdr != IPPROTO_UDP)
+ return -1;
+
+ if (bpf_skb_load_bytes(skb, ETH_HLEN + sizeof(ip6h), &udph, sizeof(udph)))
+ return -1;
+
+ if (udph.dest != __bpf_constant_htons(UDP_TEST_PORT))
+ return -1;
+
+ offset = ETH_HLEN + sizeof(ip6h) + sizeof(udph);
+ if (skb->len < offset + 16)
+ return -1;
+
+ bpf_dynptr_from_skb(skb, 0, psrc);
+ bpf_dynptr_adjust(psrc, offset, offset + 16);
+
+ return 0;
+}
+
+SEC("fentry.s/bpf_fentry_test1")
+int BPF_PROG(skb_crypto_setup)
+{
+ struct bpf_crypto_ctx *cctx;
+ struct bpf_dynptr key = {};
+ int err = 0;
+
+ status = 0;
+
+ bpf_dynptr_from_mem(crypto_key, sizeof(crypto_key), 0, &key);
+ cctx = bpf_crypto_ctx_create("skcipher", "ecb(aes)", &key, 0, &err);
+
+ if (!cctx) {
+ status = err;
+ return 0;
+ }
+
+ err = crypto_ctx_insert(cctx);
+ if (err && err != -EEXIST)
+ status = err;
+
+ return 0;
+}
+
+SEC("fentry.s/bpf_fentry_test1")
+int BPF_PROG(crypto_release)
+{
+ struct bpf_crypto_ctx *cctx;
+ struct bpf_dynptr key = {};
+ int err = 0;
+
+ status = 0;
+
+ bpf_dynptr_from_mem(crypto_key, sizeof(crypto_key), 0, &key);
+ cctx = bpf_crypto_ctx_create("skcipher", "ecb(aes)", &key, 0, &err);
+
+ if (!cctx) {
+ status = err;
+ return 0;
+ }
+
+ bpf_crypto_ctx_release(cctx);
+
+ return 0;
+}
+
+SEC("?fentry.s/bpf_fentry_test1")
+__failure __msg("Unreleased reference")
+int BPF_PROG(crypto_accuire)
+{
+ struct bpf_crypto_ctx *cctx;
+ struct bpf_dynptr key = {};
+ int err = 0;
+
+ status = 0;
+
+ bpf_dynptr_from_mem(crypto_key, sizeof(crypto_key), 0, &key);
+ cctx = bpf_crypto_ctx_create("skcipher", "ecb(aes)", &key, 0, &err);
+
+ if (!cctx) {
+ status = err;
+ return 0;
+ }
+
+ cctx = bpf_crypto_ctx_acquire(cctx);
+ if (!cctx)
+ return -EINVAL;
+
+ bpf_crypto_ctx_release(cctx);
+
+ return 0;
+}
+
+SEC("tc")
+int decrypt_sanity(struct __sk_buff *skb)
+{
+ struct __crypto_ctx_value *v;
+ struct bpf_crypto_ctx *ctx;
+ struct bpf_dynptr psrc, pdst, iv;
+ int err;
+
+ err = skb_dynptr_validate(skb, &psrc);
+ if (err < 0) {
+ status = err;
+ return TC_ACT_SHOT;
+ }
+
+ v = crypto_ctx_value_lookup();
+ if (!v) {
+ status = -ENOENT;
+ return TC_ACT_SHOT;
+ }
+
+ ctx = v->ctx;
+ if (!ctx) {
+ status = -ENOENT;
+ return TC_ACT_SHOT;
+ }
+
+ bpf_dynptr_from_mem(dst, sizeof(dst), 0, &pdst);
+ bpf_dynptr_from_mem(dst, 0, 0, &iv);
+
+ status = bpf_crypto_decrypt(ctx, &psrc, &pdst, &iv);
+
+ return TC_ACT_SHOT;
+}
+
+SEC("tc")
+int encrypt_sanity(struct __sk_buff *skb)
+{
+ struct __crypto_ctx_value *v;
+ struct bpf_crypto_ctx *ctx;
+ struct bpf_dynptr psrc, pdst, iv;
+ int err;
+
+ status = 0;
+
+ err = skb_dynptr_validate(skb, &psrc);
+ if (err < 0) {
+ status = err;
+ return TC_ACT_SHOT;
+ }
+
+ v = crypto_ctx_value_lookup();
+ if (!v) {
+ status = -ENOENT;
+ return TC_ACT_SHOT;
+ }
+
+ ctx = v->ctx;
+ if (!ctx) {
+ status = -ENOENT;
+ return TC_ACT_SHOT;
+ }
+
+ bpf_dynptr_from_mem(dst, sizeof(dst), 0, &pdst);
+ bpf_dynptr_from_mem(dst, 0, 0, &iv);
+
+ status = bpf_crypto_encrypt(ctx, &psrc, &pdst, &iv);
+
+ return TC_ACT_SHOT;
+}
+
+char __license[] SEC("license") = "GPL";
--
2.39.3

2023-11-29 22:45:08

by Stanislav Fomichev

[permalink] [raw]

Subject: Re: [PATCH bpf-next v6 1/3] bpf: make common crypto API for TC/XDP programs

On 11/29, Vadim Fedorenko wrote:
> Add crypto API support to BPF to be able to decrypt or encrypt packets
> in TC/XDP BPF programs. Special care should be taken for initialization
> part of crypto algo because crypto alloc) doesn't work with preemtion
> disabled, it can be run only in sleepable BPF program. Also async crypto
> is not supported because of the very same issue - TC/XDP BPF programs
> are not sleepable.
>
> Signed-off-by: Vadim Fedorenko <[email protected]>
>
> ---
> v5 -> v6:
> - replace lskcipher with infrastructure to provide pluggable cipher
> types
> - add BPF skcipher as plug-in module in a separate patch
> v4 -> v5:
> - replace crypto API to use lskcipher (suggested by Herbert Xu)
> - remove SG list usage and provide raw buffers
> v3 -> v4:
> - reuse __bpf_dynptr_data and remove own implementation
> - use const __str to provide algorithm name
> - use kfunc macroses to avoid compilator warnings
> v2 -> v3:
> - fix kdoc issues
> v1 -> v2:
> - use kmalloc in sleepable func, suggested by Alexei
> - use __bpf_dynptr_is_rdonly() to check destination, suggested by Jakub
> - use __bpf_dynptr_data_ptr() for all dynptr accesses
> ---
> include/linux/bpf.h | 1 +
> include/linux/bpf_crypto.h | 23 +++
> kernel/bpf/Makefile | 3 +
> kernel/bpf/crypto.c | 364 +++++++++++++++++++++++++++++++++++++
> kernel/bpf/helpers.c | 2 +-
> kernel/bpf/verifier.c | 1 +
> 6 files changed, 393 insertions(+), 1 deletion(-)
> create mode 100644 include/linux/bpf_crypto.h
> create mode 100644 kernel/bpf/crypto.c
>
> diff --git a/include/linux/bpf.h b/include/linux/bpf.h
> index eb447b0a9423..0143ff6c93a1 100644
> --- a/include/linux/bpf.h
> +++ b/include/linux/bpf.h
> @@ -1228,6 +1228,7 @@ int bpf_dynptr_check_size(u32 size);
> u32 __bpf_dynptr_size(const struct bpf_dynptr_kern *ptr);
> const void *__bpf_dynptr_data(const struct bpf_dynptr_kern *ptr, u32 len);
> void *__bpf_dynptr_data_rw(const struct bpf_dynptr_kern *ptr, u32 len);
> +bool __bpf_dynptr_is_rdonly(const struct bpf_dynptr_kern *ptr);
>
> #ifdef CONFIG_BPF_JIT
> int bpf_trampoline_link_prog(struct bpf_tramp_link *link, struct bpf_trampoline *tr);
> diff --git a/include/linux/bpf_crypto.h b/include/linux/bpf_crypto.h
> new file mode 100644
> index 000000000000..e81bd8ab979c
> --- /dev/null
> +++ b/include/linux/bpf_crypto.h
> @@ -0,0 +1,23 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
> +#ifndef _BPF_CRYPTO_H
> +#define _BPF_CRYPTO_H
> +
> +struct bpf_crypto_type {
> + void *(*alloc_tfm)(const char *algo);
> + void (*free_tfm)(void *tfm);
> + int (*has_algo)(const char *algo);
> + int (*setkey)(void *tfm, const u8 *key, unsigned int keylen);
> + int (*setauthsize)(void *tfm, unsigned int authsize);
> + int (*encrypt)(void *tfm, const u8 *src, u8 *dst, unsigned int len, u8 *iv);
> + int (*decrypt)(void *tfm, const u8 *src, u8 *dst, unsigned int len, u8 *iv);
> + unsigned int (*ivsize)(void *tfm);
> + u32 (*get_flags)(void *tfm);
> + struct module *owner;
> + char name[14];
> +};
> +
> +int bpf_crypto_register_type(const struct bpf_crypto_type *type);
> +int bpf_crypto_unregister_type(const struct bpf_crypto_type *type);
> +
> +#endif /* _BPF_CRYPTO_H */
> diff --git a/kernel/bpf/Makefile b/kernel/bpf/Makefile
> index f526b7573e97..bcde762bb2c2 100644
> --- a/kernel/bpf/Makefile
> +++ b/kernel/bpf/Makefile
> @@ -41,6 +41,9 @@ obj-$(CONFIG_BPF_SYSCALL) += bpf_struct_ops.o
> obj-$(CONFIG_BPF_SYSCALL) += cpumask.o
> obj-${CONFIG_BPF_LSM} += bpf_lsm.o
> endif
> +ifeq ($(CONFIG_CRYPTO),y)
> +obj-$(CONFIG_BPF_SYSCALL) += crypto.o
> +endif
> obj-$(CONFIG_BPF_PRELOAD) += preload/
>
> obj-$(CONFIG_BPF_SYSCALL) += relo_core.o
> diff --git a/kernel/bpf/crypto.c b/kernel/bpf/crypto.c
> new file mode 100644
> index 000000000000..46b4d263e472
> --- /dev/null
> +++ b/kernel/bpf/crypto.c
> @@ -0,0 +1,364 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/* Copyright (c) 2023 Meta, Inc */
> +#include <linux/bpf.h>
> +#include <linux/bpf_crypto.h>
> +#include <linux/bpf_mem_alloc.h>
> +#include <linux/btf.h>
> +#include <linux/btf_ids.h>
> +#include <linux/filter.h>
> +#include <linux/scatterlist.h>
> +#include <linux/skbuff.h>
> +#include <crypto/skcipher.h>
> +
> +struct bpf_crypto_type_list {
> + const struct bpf_crypto_type *type;
> + struct list_head list;
> +};
> +
> +static LIST_HEAD(bpf_crypto_types);
> +static DECLARE_RWSEM(bpf_crypto_types_sem);
> +
> +/**
> + * struct bpf_crypto_ctx - refcounted BPF crypto context structure
> + * @type: The pointer to bpf crypto type
> + * @tfm: The pointer to instance of crypto API struct.
> + * @rcu: The RCU head used to free the crypto context with RCU safety.
> + * @usage: Object reference counter. When the refcount goes to 0, the
> + * memory is released back to the BPF allocator, which provides
> + * RCU safety.
> + */
> +struct bpf_crypto_ctx {
> + const struct bpf_crypto_type *type;
> + void *tfm;
> + struct rcu_head rcu;
> + refcount_t usage;
> +};
> +
> +int bpf_crypto_register_type(const struct bpf_crypto_type *type)
> +{
> + struct bpf_crypto_type_list *node;
> + int err = -EEXIST;
> +
> + down_write(&bpf_crypto_types_sem);
> + list_for_each_entry(node, &bpf_crypto_types, list) {
> + if (!strcmp(node->type->name, type->name))
> + goto unlock;
> + }
> +
> + node = kmalloc(sizeof(*node), GFP_KERNEL);
> + err = -ENOMEM;
> + if (!node)
> + goto unlock;
> +
> + node->type = type;
> + list_add(&node->list, &bpf_crypto_types);
> + err = 0;
> +
> +unlock:
> + up_write(&bpf_crypto_types_sem);
> +
> + return err;
> +}
> +EXPORT_SYMBOL_GPL(bpf_crypto_register_type);
> +
> +int bpf_crypto_unregister_type(const struct bpf_crypto_type *type)
> +{
> + struct bpf_crypto_type_list *node;
> + int err = -ENOENT;
> +
> + down_write(&bpf_crypto_types_sem);
> + list_for_each_entry(node, &bpf_crypto_types, list) {
> + if (strcmp(node->type->name, type->name))
> + continue;
> +
> + list_del(&node->list);
> + kfree(node);
> + err = 0;
> + break;
> + }
> + up_write(&bpf_crypto_types_sem);
> +
> + return err;
> +}
> +EXPORT_SYMBOL_GPL(bpf_crypto_unregister_type);
> +
> +static const struct bpf_crypto_type *bpf_crypto_get_type(const char *name)
> +{
> + const struct bpf_crypto_type *type = ERR_PTR(-ENOENT);
> + struct bpf_crypto_type_list *node;
> +
> + down_read(&bpf_crypto_types_sem);
> + list_for_each_entry(node, &bpf_crypto_types, list) {
> + if (strcmp(node->type->name, name))
> + continue;
> +
> + if (try_module_get(node->type->owner))
> + type = node->type;
> + break;
> + }
> + up_read(&bpf_crypto_types_sem);
> +
> + return type;
> +}
> +
> +__bpf_kfunc_start_defs();
> +
> +/**
> + * bpf_crypto_ctx_create() - Create a mutable BPF crypto context.
> + *
> + * Allocates a crypto context that can be used, acquired, and released by
> + * a BPF program. The crypto context returned by this function must either
> + * be embedded in a map as a kptr, or freed with bpf_crypto_ctx_release().
> + * As crypto API functions use GFP_KERNEL allocations, this function can
> + * only be used in sleepable BPF programs.
> + *
> + * bpf_crypto_ctx_create() allocates memory for crypto context.
> + * It may return NULL if no memory is available.
> + * @type__str: pointer to string representation of crypto type.
> + * @algo__str: pointer to string representation of algorithm.
> + * @pkey: bpf_dynptr which holds cipher key to do crypto.
> + * @err: integer to store error code when NULL is returned
> + */
> +__bpf_kfunc struct bpf_crypto_ctx *
> +bpf_crypto_ctx_create(const char *type__str, const char *algo__str,
> + const struct bpf_dynptr_kern *pkey,
> + unsigned int authsize, int *err)
> +{
> + const struct bpf_crypto_type *type = bpf_crypto_get_type(type__str);
> + struct bpf_crypto_ctx *ctx;
> + const u8 *key;
> + u32 key_len;
> +
> + //type = bpf_crypto_get_type(type__str);

Passing by comment: the line above probably shouldn't start with // ?

2023-11-29 22:45:18

by Vadim Fedorenko

[permalink] [raw]

Subject: Re: [PATCH bpf-next v6 1/3] bpf: make common crypto API for TC/XDP programs

On 29/11/2023 13:46, Stanislav Fomichev wrote:
> On 11/29, Vadim Fedorenko wrote:
>> Add crypto API support to BPF to be able to decrypt or encrypt packets
>> in TC/XDP BPF programs. Special care should be taken for initialization
>> part of crypto algo because crypto alloc) doesn't work with preemtion
>> disabled, it can be run only in sleepable BPF program. Also async crypto
>> is not supported because of the very same issue - TC/XDP BPF programs
>> are not sleepable.
>>
>> Signed-off-by: Vadim Fedorenko <[email protected]>
>>
>> ---
>> v5 -> v6:
>> - replace lskcipher with infrastructure to provide pluggable cipher
>> types
>> - add BPF skcipher as plug-in module in a separate patch
>> v4 -> v5:
>> - replace crypto API to use lskcipher (suggested by Herbert Xu)
>> - remove SG list usage and provide raw buffers
>> v3 -> v4:
>> - reuse __bpf_dynptr_data and remove own implementation
>> - use const __str to provide algorithm name
>> - use kfunc macroses to avoid compilator warnings
>> v2 -> v3:
>> - fix kdoc issues
>> v1 -> v2:
>> - use kmalloc in sleepable func, suggested by Alexei
>> - use __bpf_dynptr_is_rdonly() to check destination, suggested by Jakub
>> - use __bpf_dynptr_data_ptr() for all dynptr accesses
>> ---
>> include/linux/bpf.h | 1 +
>> include/linux/bpf_crypto.h | 23 +++
>> kernel/bpf/Makefile | 3 +
>> kernel/bpf/crypto.c | 364 +++++++++++++++++++++++++++++++++++++
>> kernel/bpf/helpers.c | 2 +-
>> kernel/bpf/verifier.c | 1 +
>> 6 files changed, 393 insertions(+), 1 deletion(-)
>> create mode 100644 include/linux/bpf_crypto.h
>> create mode 100644 kernel/bpf/crypto.c
>>
>> diff --git a/include/linux/bpf.h b/include/linux/bpf.h
>> index eb447b0a9423..0143ff6c93a1 100644
>> --- a/include/linux/bpf.h
>> +++ b/include/linux/bpf.h
>> @@ -1228,6 +1228,7 @@ int bpf_dynptr_check_size(u32 size);
>> u32 __bpf_dynptr_size(const struct bpf_dynptr_kern *ptr);
>> const void *__bpf_dynptr_data(const struct bpf_dynptr_kern *ptr, u32 len);
>> void *__bpf_dynptr_data_rw(const struct bpf_dynptr_kern *ptr, u32 len);
>> +bool __bpf_dynptr_is_rdonly(const struct bpf_dynptr_kern *ptr);
>>
>> #ifdef CONFIG_BPF_JIT
>> int bpf_trampoline_link_prog(struct bpf_tramp_link *link, struct bpf_trampoline *tr);
>> diff --git a/include/linux/bpf_crypto.h b/include/linux/bpf_crypto.h
>> new file mode 100644
>> index 000000000000..e81bd8ab979c
>> --- /dev/null
>> +++ b/include/linux/bpf_crypto.h
>> @@ -0,0 +1,23 @@
>> +/* SPDX-License-Identifier: GPL-2.0-only */
>> +/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
>> +#ifndef _BPF_CRYPTO_H
>> +#define _BPF_CRYPTO_H
>> +
>> +struct bpf_crypto_type {
>> + void *(*alloc_tfm)(const char *algo);
>> + void (*free_tfm)(void *tfm);
>> + int (*has_algo)(const char *algo);
>> + int (*setkey)(void *tfm, const u8 *key, unsigned int keylen);
>> + int (*setauthsize)(void *tfm, unsigned int authsize);
>> + int (*encrypt)(void *tfm, const u8 *src, u8 *dst, unsigned int len, u8 *iv);
>> + int (*decrypt)(void *tfm, const u8 *src, u8 *dst, unsigned int len, u8 *iv);
>> + unsigned int (*ivsize)(void *tfm);
>> + u32 (*get_flags)(void *tfm);
>> + struct module *owner;
>> + char name[14];
>> +};
>> +
>> +int bpf_crypto_register_type(const struct bpf_crypto_type *type);
>> +int bpf_crypto_unregister_type(const struct bpf_crypto_type *type);
>> +
>> +#endif /* _BPF_CRYPTO_H */
>> diff --git a/kernel/bpf/Makefile b/kernel/bpf/Makefile
>> index f526b7573e97..bcde762bb2c2 100644
>> --- a/kernel/bpf/Makefile
>> +++ b/kernel/bpf/Makefile
>> @@ -41,6 +41,9 @@ obj-$(CONFIG_BPF_SYSCALL) += bpf_struct_ops.o
>> obj-$(CONFIG_BPF_SYSCALL) += cpumask.o
>> obj-${CONFIG_BPF_LSM} += bpf_lsm.o
>> endif
>> +ifeq ($(CONFIG_CRYPTO),y)
>> +obj-$(CONFIG_BPF_SYSCALL) += crypto.o
>> +endif
>> obj-$(CONFIG_BPF_PRELOAD) += preload/
>>
>> obj-$(CONFIG_BPF_SYSCALL) += relo_core.o
>> diff --git a/kernel/bpf/crypto.c b/kernel/bpf/crypto.c
>> new file mode 100644
>> index 000000000000..46b4d263e472
>> --- /dev/null
>> +++ b/kernel/bpf/crypto.c
>> @@ -0,0 +1,364 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/* Copyright (c) 2023 Meta, Inc */
>> +#include <linux/bpf.h>
>> +#include <linux/bpf_crypto.h>
>> +#include <linux/bpf_mem_alloc.h>
>> +#include <linux/btf.h>
>> +#include <linux/btf_ids.h>
>> +#include <linux/filter.h>
>> +#include <linux/scatterlist.h>
>> +#include <linux/skbuff.h>
>> +#include <crypto/skcipher.h>
>> +
>> +struct bpf_crypto_type_list {
>> + const struct bpf_crypto_type *type;
>> + struct list_head list;
>> +};
>> +
>> +static LIST_HEAD(bpf_crypto_types);
>> +static DECLARE_RWSEM(bpf_crypto_types_sem);
>> +
>> +/**
>> + * struct bpf_crypto_ctx - refcounted BPF crypto context structure
>> + * @type: The pointer to bpf crypto type
>> + * @tfm: The pointer to instance of crypto API struct.
>> + * @rcu: The RCU head used to free the crypto context with RCU safety.
>> + * @usage: Object reference counter. When the refcount goes to 0, the
>> + * memory is released back to the BPF allocator, which provides
>> + * RCU safety.
>> + */
>> +struct bpf_crypto_ctx {
>> + const struct bpf_crypto_type *type;
>> + void *tfm;
>> + struct rcu_head rcu;
>> + refcount_t usage;
>> +};
>> +
>> +int bpf_crypto_register_type(const struct bpf_crypto_type *type)
>> +{
>> + struct bpf_crypto_type_list *node;
>> + int err = -EEXIST;
>> +
>> + down_write(&bpf_crypto_types_sem);
>> + list_for_each_entry(node, &bpf_crypto_types, list) {
>> + if (!strcmp(node->type->name, type->name))
>> + goto unlock;
>> + }
>> +
>> + node = kmalloc(sizeof(*node), GFP_KERNEL);
>> + err = -ENOMEM;
>> + if (!node)
>> + goto unlock;
>> +
>> + node->type = type;
>> + list_add(&node->list, &bpf_crypto_types);
>> + err = 0;
>> +
>> +unlock:
>> + up_write(&bpf_crypto_types_sem);
>> +
>> + return err;
>> +}
>> +EXPORT_SYMBOL_GPL(bpf_crypto_register_type);
>> +
>> +int bpf_crypto_unregister_type(const struct bpf_crypto_type *type)
>> +{
>> + struct bpf_crypto_type_list *node;
>> + int err = -ENOENT;
>> +
>> + down_write(&bpf_crypto_types_sem);
>> + list_for_each_entry(node, &bpf_crypto_types, list) {
>> + if (strcmp(node->type->name, type->name))
>> + continue;
>> +
>> + list_del(&node->list);
>> + kfree(node);
>> + err = 0;
>> + break;
>> + }
>> + up_write(&bpf_crypto_types_sem);
>> +
>> + return err;
>> +}
>> +EXPORT_SYMBOL_GPL(bpf_crypto_unregister_type);
>> +
>> +static const struct bpf_crypto_type *bpf_crypto_get_type(const char *name)
>> +{
>> + const struct bpf_crypto_type *type = ERR_PTR(-ENOENT);
>> + struct bpf_crypto_type_list *node;
>> +
>> + down_read(&bpf_crypto_types_sem);
>> + list_for_each_entry(node, &bpf_crypto_types, list) {
>> + if (strcmp(node->type->name, name))
>> + continue;
>> +
>> + if (try_module_get(node->type->owner))
>> + type = node->type;
>> + break;
>> + }
>> + up_read(&bpf_crypto_types_sem);
>> +
>> + return type;
>> +}
>> +
>> +__bpf_kfunc_start_defs();
>> +
>> +/**
>> + * bpf_crypto_ctx_create() - Create a mutable BPF crypto context.
>> + *
>> + * Allocates a crypto context that can be used, acquired, and released by
>> + * a BPF program. The crypto context returned by this function must either
>> + * be embedded in a map as a kptr, or freed with bpf_crypto_ctx_release().
>> + * As crypto API functions use GFP_KERNEL allocations, this function can
>> + * only be used in sleepable BPF programs.
>> + *
>> + * bpf_crypto_ctx_create() allocates memory for crypto context.
>> + * It may return NULL if no memory is available.
>> + * @type__str: pointer to string representation of crypto type.
>> + * @algo__str: pointer to string representation of algorithm.
>> + * @pkey: bpf_dynptr which holds cipher key to do crypto.
>> + * @err: integer to store error code when NULL is returned
>> + */
>> +__bpf_kfunc struct bpf_crypto_ctx *
>> +bpf_crypto_ctx_create(const char *type__str, const char *algo__str,
>> + const struct bpf_dynptr_kern *pkey,
>> + unsigned int authsize, int *err)
>> +{
>> + const struct bpf_crypto_type *type = bpf_crypto_get_type(type__str);
>> + struct bpf_crypto_ctx *ctx;
>> + const u8 *key;
>> + u32 key_len;
>> +
>> + //type = bpf_crypto_get_type(type__str);
>
> Passing by comment: the line above probably shouldn't start with // ?

Yeah, just spotted this line with Martin, this line should be real code.
I'll fix it in v6, but for now I would like to have some comments about
implementation itself.

2023-11-30 02:40:43

by Herbert Xu

[permalink] [raw]

Subject: Re: [PATCH bpf-next v6 2/3] bpf: crypto: add skcipher to bpf crypto

On Wed, Nov 29, 2023 at 09:33:11AM -0800, Vadim Fedorenko wrote:
> Implement skcipher crypto in BPF crypto framework.
>
> Signed-off-by: Vadim Fedorenko <[email protected]>
> ---
> v6:
> - make skcipher implementation in separate patch
> ---
> kernel/bpf/Makefile | 3 ++
> kernel/bpf/crypto_skcipher.c | 76 ++++++++++++++++++++++++++++++++++++
> 2 files changed, 79 insertions(+)
> create mode 100644 kernel/bpf/crypto_skcipher.c

I just made some adjustments to the lskcipher API so you may want
to hold off for a bit:

https://lore.kernel.org/linux-crypto/[email protected]/T/#u

Basically it adds the ability to process more than one piece of
data for stream ciphers such as chacha.

Thanks,
--
Email: Herbert Xu <[email protected]>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

2023-11-30 04:38:53

by kernel test robot

[permalink] [raw]

Subject: Re: [PATCH bpf-next v6 1/3] bpf: make common crypto API for TC/XDP programs

Hi Vadim,

kernel test robot noticed the following build errors:

[auto build test ERROR on bpf-next/master]

url: https://github.com/intel-lab-lkp/linux/commits/Vadim-Fedorenko/bpf-crypto-add-skcipher-to-bpf-crypto/20231130-014813
base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link: https://lore.kernel.org/r/20231129173312.31008-1-vadfed%40meta.com
patch subject: [PATCH bpf-next v6 1/3] bpf: make common crypto API for TC/XDP programs
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231130/[email protected]/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All errors (new ones prefixed by >>):

3103 | psmouse->ps2dev.serio->phys);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/input/mouse/lifebook.c: In function 'lifebook_init':
drivers/input/mouse/lifebook.c:283:21: warning: '/input1' directive output may be truncated writing 7 bytes into a region of size between 1 and 32 [-Wformat-truncation=]
283 | "%s/input1", psmouse->ps2dev.serio->phys);
| ^~~~~~~
In function 'lifebook_create_relative_device',
inlined from 'lifebook_init' at drivers/input/mouse/lifebook.c:331:11:
drivers/input/mouse/lifebook.c:282:9: note: 'snprintf' output between 8 and 39 bytes into a destination of size 32
282 | snprintf(priv->phys, sizeof(priv->phys),
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
283 | "%s/input1", psmouse->ps2dev.serio->phys);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/input/mouse/elantech.c: In function 'elantech_setup_ps2':
drivers/input/mouse/elantech.c:2090:65: warning: '/input1' directive output may be truncated writing 7 bytes into a region of size between 1 and 32 [-Wformat-truncation=]
2090 | snprintf(etd->tp_phys, sizeof(etd->tp_phys), "%s/input1",
| ^~~~~~~
drivers/input/mouse/elantech.c:2090:17: note: 'snprintf' output between 8 and 39 bytes into a destination of size 32
2090 | snprintf(etd->tp_phys, sizeof(etd->tp_phys), "%s/input1",
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2091 | psmouse->ps2dev.serio->phys);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/bpf/btf.c: In function 'btf_seq_show':
kernel/bpf/btf.c:7091:29: warning: function 'btf_seq_show' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]
7091 | seq_vprintf((struct seq_file *)show->target, fmt, args);
| ^~~~~~~~
kernel/bpf/btf.c: In function 'btf_snprintf_show':
kernel/bpf/btf.c:7128:9: warning: function 'btf_snprintf_show' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]
7128 | len = vsnprintf(show->target, ssnprintf->len_left, fmt, args);
| ^~~
drivers/input/mouse/vmmouse.c: In function 'vmmouse_init':
drivers/input/mouse/vmmouse.c:455:53: warning: '/input1' directive output may be truncated writing 7 bytes into a region of size between 1 and 32 [-Wformat-truncation=]
455 | snprintf(priv->phys, sizeof(priv->phys), "%s/input1",
| ^~~~~~~
drivers/input/mouse/vmmouse.c:455:9: note: 'snprintf' output between 8 and 39 bytes into a destination of size 32
455 | snprintf(priv->phys, sizeof(priv->phys), "%s/input1",
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
456 | psmouse->ps2dev.serio->phys);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/trace/trace_events_synth.c:1165: warning: Excess function parameter 'args' description in '__synth_event_gen_cmd_start'
kernel/trace/trace_events_synth.c:1714: warning: Excess function parameter 'args' description in 'synth_event_trace'
drivers/thermal/thermal_sysfs.c: In function 'create_trip_attrs':
drivers/thermal/thermal_sysfs.c:475:38: warning: '%d' directive output may be truncated writing between 1 and 11 bytes into a region of size 9 [-Wformat-truncation=]
475 | "trip_point_%d_type", indx);
| ^~
drivers/thermal/thermal_sysfs.c:475:26: note: directive argument in the range [-2147483644, 2147483646]
475 | "trip_point_%d_type", indx);
| ^~~~~~~~~~~~~~~~~~~~
drivers/thermal/thermal_sysfs.c:474:17: note: 'snprintf' output between 18 and 28 bytes into a destination of size 20
474 | snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
475 | "trip_point_%d_type", indx);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/thermal/thermal_sysfs.c:486:38: warning: '%d' directive output may be truncated writing between 1 and 11 bytes into a region of size 9 [-Wformat-truncation=]
486 | "trip_point_%d_temp", indx);
| ^~
drivers/thermal/thermal_sysfs.c:486:26: note: directive argument in the range [-2147483644, 2147483646]
486 | "trip_point_%d_temp", indx);
| ^~~~~~~~~~~~~~~~~~~~
drivers/thermal/thermal_sysfs.c:485:17: note: 'snprintf' output between 18 and 28 bytes into a destination of size 20
485 | snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
486 | "trip_point_%d_temp", indx);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/thermal/thermal_sysfs.c:502:38: warning: '%d' directive output may be truncated writing between 1 and 11 bytes into a region of size 9 [-Wformat-truncation=]
502 | "trip_point_%d_hyst", indx);
| ^~
drivers/thermal/thermal_sysfs.c:502:26: note: directive argument in the range [-2147483644, 2147483646]
502 | "trip_point_%d_hyst", indx);
| ^~~~~~~~~~~~~~~~~~~~
drivers/thermal/thermal_sysfs.c:501:17: note: 'snprintf' output between 18 and 28 bytes into a destination of size 20
501 | snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
502 | "trip_point_%d_hyst", indx);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from drivers/net/usb/asix.h:28,
from drivers/net/usb/ax88172a.c:15:
drivers/net/usb/ax88172a.c: In function 'ax88172a_reset':
include/linux/phy.h:300:20: warning: '%s' directive output may be truncated writing up to 60 bytes into a region of size 20 [-Wformat-truncation=]
300 | #define PHY_ID_FMT "%s:%02x"
| ^~~~~~~~~
drivers/net/usb/ax88172a.c:309:38: note: in expansion of macro 'PHY_ID_FMT'
309 | snprintf(priv->phy_name, 20, PHY_ID_FMT,
| ^~~~~~~~~~
include/linux/phy.h:300:21: note: format string is defined here
300 | #define PHY_ID_FMT "%s:%02x"
| ^~
include/linux/phy.h:300:20: note: directive argument in the range [0, 65535]
300 | #define PHY_ID_FMT "%s:%02x"
| ^~~~~~~~~
drivers/net/usb/ax88172a.c:309:38: note: in expansion of macro 'PHY_ID_FMT'
309 | snprintf(priv->phy_name, 20, PHY_ID_FMT,
| ^~~~~~~~~~
drivers/net/usb/ax88172a.c:309:9: note: 'snprintf' output between 4 and 66 bytes into a destination of size 20
309 | snprintf(priv->phy_name, 20, PHY_ID_FMT,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
310 | priv->mdio->id, priv->phy_addr);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/usb/host/xhci.c:1350: warning: Function parameter or member 'desc' not described in 'xhci_get_endpoint_index'
kernel/bpf/crypto.c: In function 'bpf_crypto_ctx_create':
>> kernel/bpf/crypto.c:179:60: error: expected ')' before ';' token
179 | *err = type->setauthsize(ctx->tfm, authsize;
| ~ ^
| )
>> kernel/bpf/crypto.c:181:34: error: expected ';' before '}' token
181 | goto err;
| ^
| ;
182 | }
| ~
make[5]: *** [scripts/Makefile.build:243: kernel/bpf/crypto.o] Error 1
drivers/cpuidle/governors/ladder.c:54: warning: Function parameter or member 'dev' not described in 'ladder_do_selection'
make[5]: Target 'kernel/bpf/' not remade because of errors.
make[4]: *** [scripts/Makefile.build:480: kernel/bpf] Error 2
drivers/cpufreq/intel_pstate.c:264: warning: Function parameter or member 'epp_cached' not described in 'cpudata'
make[4]: Target 'kernel/' not remade because of errors.
make[3]: *** [scripts/Makefile.build:480: kernel] Error 2
drivers/leds/led-core.c: In function 'led_compose_name':
drivers/leds/led-core.c:514:78: warning: 'snprintf' output may be truncated before the last format character [-Wformat-truncation=]
514 | snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s",
| ^
drivers/leds/led-core.c:514:25: note: 'snprintf' output 2 or more bytes (assuming 65) into a destination of size 64
514 | snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s",
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
515 | devicename, tmp_buf);
| ~~~~~~~~~~~~~~~~~~~~
drivers/hid/hid-magicmouse.c:148: warning: Function parameter or member 'hdev' not described in 'magicmouse_sc'
drivers/hid/hid-magicmouse.c:148: warning: Function parameter or member 'work' not described in 'magicmouse_sc'
drivers/hid/hid-magicmouse.c:148: warning: Function parameter or member 'battery_timer' not described in 'magicmouse_sc'
drivers/hwspinlock/hwspinlock_core.c:208: warning: Function parameter or member 'to' not described in '__hwspin_lock_timeout'
drivers/hwspinlock/hwspinlock_core.c:208: warning: Excess function parameter 'timeout' description in '__hwspin_lock_timeout'
drivers/hwspinlock/hwspinlock_core.c:318: warning: Excess function parameter 'bank' description in 'of_hwspin_lock_simple_xlate'
drivers/hwspinlock/hwspinlock_core.c:647: warning: Function parameter or member 'hwlock' not described in '__hwspin_lock_request'
drivers/firmware/efi/memmap.c:132: warning: Function parameter or member 'addr' not described in 'efi_memmap_init_late'
drivers/firmware/efi/memmap.c:132: warning: Excess function parameter 'phys_addr' description in 'efi_memmap_init_late'
drivers/hv/channel.c:597: warning: Function parameter or member 'size' not described in 'request_arr_init'
drivers/firmware/efi/cper-x86.c: In function 'cper_print_proc_ia':
drivers/firmware/efi/cper-x86.c:295:72: warning: 'snprintf' output may be truncated before the last format character [-Wformat-truncation=]
295 | snprintf(infopfx, sizeof(infopfx), "%s ",
| ^
drivers/firmware/efi/cper-x86.c:295:33: note: 'snprintf' output between 2 and 65 bytes into a destination of size 64
295 | snprintf(infopfx, sizeof(infopfx), "%s ",
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
296 | newpfx);
| ~~~~~~~
drivers/firmware/efi/libstub/efi-stub-helper.c:563: warning: Function parameter or member 'out' not described in 'efi_load_initrd'
drivers/firmware/efi/libstub/alignedmem.c:27: warning: Function parameter or member 'memory_type' not described in 'efi_allocate_pages_aligned'
make[3]: Target './' not remade because of errors.
make[2]: *** [Makefile:1911: .] Error 2
make[2]: Target 'vmlinux' not remade because of errors.
make[1]: *** [Makefile:234: __sub-make] Error 2
make[1]: Target 'vmlinux' not remade because of errors.
make: *** [Makefile:234: __sub-make] Error 2
make: Target 'vmlinux' not remade because of errors.

vim +179 kernel/bpf/crypto.c

105
106 /**
107 * bpf_crypto_ctx_create() - Create a mutable BPF crypto context.
108 *
109 * Allocates a crypto context that can be used, acquired, and released by
110 * a BPF program. The crypto context returned by this function must either
111 * be embedded in a map as a kptr, or freed with bpf_crypto_ctx_release().
112 * As crypto API functions use GFP_KERNEL allocations, this function can
113 * only be used in sleepable BPF programs.
114 *
115 * bpf_crypto_ctx_create() allocates memory for crypto context.
116 * It may return NULL if no memory is available.
117 * @type__str: pointer to string representation of crypto type.
118 * @algo__str: pointer to string representation of algorithm.
119 * @pkey: bpf_dynptr which holds cipher key to do crypto.
120 * @err: integer to store error code when NULL is returned
121 */
122 __bpf_kfunc struct bpf_crypto_ctx *
123 bpf_crypto_ctx_create(const char *type__str, const char *algo__str,
124 const struct bpf_dynptr_kern *pkey,
125 unsigned int authsize, int *err)
126 {
127 const struct bpf_crypto_type *type = bpf_crypto_get_type(type__str);
128 struct bpf_crypto_ctx *ctx;
129 const u8 *key;
130 u32 key_len;
131
132 //type = bpf_crypto_get_type(type__str);
133 if (IS_ERR(type)) {
134 *err = PTR_ERR(type);
135 return NULL;
136 }
137
138 if (!type->has_algo(algo__str)) {
139 *err = -EOPNOTSUPP;
140 goto err;
141 }
142
143 if (!authsize && type->setauthsize) {
144 *err = -EOPNOTSUPP;
145 goto err;
146 }
147
148 if (authsize && !type->setauthsize) {
149 *err = -EOPNOTSUPP;
150 goto err;
151 }
152
153 key_len = __bpf_dynptr_size(pkey);
154 if (!key_len) {
155 *err = -EINVAL;
156 goto err;
157 }
158 key = __bpf_dynptr_data(pkey, key_len);
159 if (!key) {
160 *err = -EINVAL;
161 goto err;
162 }
163
164 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
165 if (!ctx) {
166 *err = -ENOMEM;
167 goto err;
168 }
169
170 ctx->type = type;
171 ctx->tfm = type->alloc_tfm(algo__str);
172 if (IS_ERR(ctx->tfm)) {
173 *err = PTR_ERR(ctx->tfm);
174 ctx->tfm = NULL;
175 goto err;
176 }
177
178 if (authsize) {
> 179 *err = type->setauthsize(ctx->tfm, authsize;
180 if (*err)
> 181 goto err;
182 }
183
184 *err = type->setkey(ctx->tfm, key, key_len);
185 if (*err)
186 goto err;
187
188 refcount_set(&ctx->usage, 1);
189
190 return ctx;
191 err:
192 if (ctx->tfm)
193 type->free_tfm(ctx->tfm);
194 kfree(ctx);
195 module_put(type->owner);
196
197 return NULL;
198 }
199

--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

2023-11-30 04:39:00

by kernel test robot

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