#endif /* CONFIG_BPF_SYSCALL */
#endif /* defined(CONFIG_INET) && defined(CONFIG_BPF_SYSCALL) */
+#if defined(CONFIG_KEYS) && defined(CONFIG_BPF_SYSCALL)
+
+struct bpf_key *bpf_lookup_user_key(s32 serial, u64 flags);
+struct bpf_key *bpf_lookup_system_key(u64 id);
+void bpf_key_put(struct bpf_key *bkey);
+int bpf_verify_pkcs7_signature(struct bpf_dynptr *data_p,
+ struct bpf_dynptr *sig_p,
+ struct bpf_key *trusted_keyring);
+
+#else
+static inline struct bpf_key *bpf_lookup_user_key(u32 serial, u64 flags)
+{
+ return NULL;
+}
+
+static inline struct bpf_key *bpf_lookup_system_key(u64 id)
+{
+ return NULL;
+}
+
+static inline void bpf_key_put(struct bpf_key *bkey)
+{
+}
+
+static inline int bpf_verify_pkcs7_signature(struct bpf_dynptr *data_p,
+ struct bpf_dynptr *sig_p,
+ struct bpf_key *trusted_keyring)
+{
+ return -EOPNOTSUPP;
+}
+#endif /* defined(CONFIG_KEYS) && defined(CONFIG_BPF_SYSCALL) */
+
/* verifier prototypes for helper functions called from eBPF programs */
extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
extern const struct bpf_func_proto bpf_map_update_elem_proto;
#include <linux/kasan.h>
#include <linux/bpf_verifier.h>
#include <linux/uaccess.h>
+#include <linux/verification.h>
#include "../../lib/kstrtox.h"
{
return bpf_strnstr(s1__ign, s2__ign, XATTR_SIZE_MAX);
}
+#ifdef CONFIG_KEYS
+/**
+ * bpf_lookup_user_key - lookup a key by its serial
+ * @serial: key handle serial number
+ * @flags: lookup-specific flags
+ *
+ * Search a key with a given *serial* and the provided *flags*.
+ * If found, increment the reference count of the key by one, and
+ * return it in the bpf_key structure.
+ *
+ * The bpf_key structure must be passed to bpf_key_put() when done
+ * with it, so that the key reference count is decremented and the
+ * bpf_key structure is freed.
+ *
+ * Permission checks are deferred to the time the key is used by
+ * one of the available key-specific kfuncs.
+ *
+ * Set *flags* with KEY_LOOKUP_CREATE, to attempt creating a requested
+ * special keyring (e.g. session keyring), if it doesn't yet exist.
+ * Set *flags* with KEY_LOOKUP_PARTIAL, to lookup a key without waiting
+ * for the key construction, and to retrieve uninstantiated keys (keys
+ * without data attached to them).
+ *
+ * Return: a bpf_key pointer with a valid key pointer if the key is found, a
+ * NULL pointer otherwise.
+ */
+__bpf_kfunc struct bpf_key *bpf_lookup_user_key(s32 serial, u64 flags)
+{
+ key_ref_t key_ref;
+ struct bpf_key *bkey;
+
+ if (flags & ~KEY_LOOKUP_ALL)
+ return NULL;
+
+ /*
+ * Permission check is deferred until the key is used, as the
+ * intent of the caller is unknown here.
+ */
+ key_ref = lookup_user_key(serial, flags, KEY_DEFER_PERM_CHECK);
+ if (IS_ERR(key_ref))
+ return NULL;
+
+ bkey = kmalloc(sizeof(*bkey), GFP_KERNEL);
+ if (!bkey) {
+ key_put(key_ref_to_ptr(key_ref));
+ return NULL;
+ }
+
+ bkey->key = key_ref_to_ptr(key_ref);
+ bkey->has_ref = true;
+
+ return bkey;
+}
+
+/**
+ * bpf_lookup_system_key - lookup a key by a system-defined ID
+ * @id: key ID
+ *
+ * Obtain a bpf_key structure with a key pointer set to the passed key ID.
+ * The key pointer is marked as invalid, to prevent bpf_key_put() from
+ * attempting to decrement the key reference count on that pointer. The key
+ * pointer set in such way is currently understood only by
+ * verify_pkcs7_signature().
+ *
+ * Set *id* to one of the values defined in include/linux/verification.h:
+ * 0 for the primary keyring (immutable keyring of system keys);
+ * VERIFY_USE_SECONDARY_KEYRING for both the primary and secondary keyring
+ * (where keys can be added only if they are vouched for by existing keys
+ * in those keyrings); VERIFY_USE_PLATFORM_KEYRING for the platform
+ * keyring (primarily used by the integrity subsystem to verify a kexec'ed
+ * kerned image and, possibly, the initramfs signature).
+ *
+ * Return: a bpf_key pointer with an invalid key pointer set from the
+ * pre-determined ID on success, a NULL pointer otherwise
+ */
+__bpf_kfunc struct bpf_key *bpf_lookup_system_key(u64 id)
+{
+ struct bpf_key *bkey;
+
+ if (system_keyring_id_check(id) < 0)
+ return NULL;
+
+ bkey = kmalloc(sizeof(*bkey), GFP_ATOMIC);
+ if (!bkey)
+ return NULL;
+
+ bkey->key = (struct key *)(unsigned long)id;
+ bkey->has_ref = false;
+
+ return bkey;
+}
+
+/**
+ * bpf_key_put - decrement key reference count if key is valid and free bpf_key
+ * @bkey: bpf_key structure
+ *
+ * Decrement the reference count of the key inside *bkey*, if the pointer
+ * is valid, and free *bkey*.
+ */
+__bpf_kfunc void bpf_key_put(struct bpf_key *bkey)
+{
+ if (bkey->has_ref)
+ key_put(bkey->key);
+
+ kfree(bkey);
+}
+
+/**
+ * bpf_verify_pkcs7_signature - verify a PKCS#7 signature
+ * @data_p: data to verify
+ * @sig_p: signature of the data
+ * @trusted_keyring: keyring with keys trusted for signature verification
+ *
+ * Verify the PKCS#7 signature *sig_ptr* against the supplied *data_ptr*
+ * with keys in a keyring referenced by *trusted_keyring*.
+ *
+ * Return: 0 on success, a negative value on error.
+ */
+__bpf_kfunc int bpf_verify_pkcs7_signature(struct bpf_dynptr *data_p,
+ struct bpf_dynptr *sig_p,
+ struct bpf_key *trusted_keyring)
+{
+#ifdef CONFIG_SYSTEM_DATA_VERIFICATION
+ struct bpf_dynptr_kern *data_ptr = (struct bpf_dynptr_kern *)data_p;
+ struct bpf_dynptr_kern *sig_ptr = (struct bpf_dynptr_kern *)sig_p;
+ const void *data, *sig;
+ u32 data_len, sig_len;
+ int ret;
+
+ if (trusted_keyring->has_ref) {
+ /*
+ * Do the permission check deferred in bpf_lookup_user_key().
+ * See bpf_lookup_user_key() for more details.
+ *
+ * A call to key_task_permission() here would be redundant, as
+ * it is already done by keyring_search() called by
+ * find_asymmetric_key().
+ */
+ ret = key_validate(trusted_keyring->key);
+ if (ret < 0)
+ return ret;
+ }
+
+ data_len = __bpf_dynptr_size(data_ptr);
+ data = __bpf_dynptr_data(data_ptr, data_len);
+ sig_len = __bpf_dynptr_size(sig_ptr);
+ sig = __bpf_dynptr_data(sig_ptr, sig_len);
+
+ return verify_pkcs7_signature(data, data_len, sig, sig_len,
+ trusted_keyring->key,
+ VERIFYING_UNSPECIFIED_SIGNATURE, NULL,
+ NULL);
+#else
+ return -EOPNOTSUPP;
+#endif /* CONFIG_SYSTEM_DATA_VERIFICATION */
+}
+#endif /* CONFIG_KEYS */
__bpf_kfunc_end_defs();
#ifdef CONFIG_BPF_EVENTS
BTF_ID_FLAGS(func, bpf_send_signal_task, KF_TRUSTED_ARGS)
#endif
+#ifdef CONFIG_KEYS
+BTF_ID_FLAGS(func, bpf_lookup_user_key, KF_ACQUIRE | KF_RET_NULL | KF_SLEEPABLE)
+BTF_ID_FLAGS(func, bpf_lookup_system_key, KF_ACQUIRE | KF_RET_NULL)
+BTF_ID_FLAGS(func, bpf_key_put, KF_RELEASE)
+#ifdef CONFIG_SYSTEM_DATA_VERIFICATION
+BTF_ID_FLAGS(func, bpf_verify_pkcs7_signature, KF_SLEEPABLE)
+#endif
+#endif
BTF_KFUNCS_END(generic_btf_ids)
static const struct btf_kfunc_id_set generic_kfunc_set = {
#include <linux/bsearch.h>
#include <linux/sort.h>
#include <linux/key.h>
-#include <linux/verification.h>
#include <linux/namei.h>
#include <net/bpf_sk_storage.h>
.arg1_type = ARG_PTR_TO_CTX,
};
-#ifdef CONFIG_KEYS
-__bpf_kfunc_start_defs();
-
-/**
- * bpf_lookup_user_key - lookup a key by its serial
- * @serial: key handle serial number
- * @flags: lookup-specific flags
- *
- * Search a key with a given *serial* and the provided *flags*.
- * If found, increment the reference count of the key by one, and
- * return it in the bpf_key structure.
- *
- * The bpf_key structure must be passed to bpf_key_put() when done
- * with it, so that the key reference count is decremented and the
- * bpf_key structure is freed.
- *
- * Permission checks are deferred to the time the key is used by
- * one of the available key-specific kfuncs.
- *
- * Set *flags* with KEY_LOOKUP_CREATE, to attempt creating a requested
- * special keyring (e.g. session keyring), if it doesn't yet exist.
- * Set *flags* with KEY_LOOKUP_PARTIAL, to lookup a key without waiting
- * for the key construction, and to retrieve uninstantiated keys (keys
- * without data attached to them).
- *
- * Return: a bpf_key pointer with a valid key pointer if the key is found, a
- * NULL pointer otherwise.
- */
-__bpf_kfunc struct bpf_key *bpf_lookup_user_key(s32 serial, u64 flags)
-{
- key_ref_t key_ref;
- struct bpf_key *bkey;
-
- if (flags & ~KEY_LOOKUP_ALL)
- return NULL;
-
- /*
- * Permission check is deferred until the key is used, as the
- * intent of the caller is unknown here.
- */
- key_ref = lookup_user_key(serial, flags, KEY_DEFER_PERM_CHECK);
- if (IS_ERR(key_ref))
- return NULL;
-
- bkey = kmalloc(sizeof(*bkey), GFP_KERNEL);
- if (!bkey) {
- key_put(key_ref_to_ptr(key_ref));
- return NULL;
- }
-
- bkey->key = key_ref_to_ptr(key_ref);
- bkey->has_ref = true;
-
- return bkey;
-}
-
-/**
- * bpf_lookup_system_key - lookup a key by a system-defined ID
- * @id: key ID
- *
- * Obtain a bpf_key structure with a key pointer set to the passed key ID.
- * The key pointer is marked as invalid, to prevent bpf_key_put() from
- * attempting to decrement the key reference count on that pointer. The key
- * pointer set in such way is currently understood only by
- * verify_pkcs7_signature().
- *
- * Set *id* to one of the values defined in include/linux/verification.h:
- * 0 for the primary keyring (immutable keyring of system keys);
- * VERIFY_USE_SECONDARY_KEYRING for both the primary and secondary keyring
- * (where keys can be added only if they are vouched for by existing keys
- * in those keyrings); VERIFY_USE_PLATFORM_KEYRING for the platform
- * keyring (primarily used by the integrity subsystem to verify a kexec'ed
- * kerned image and, possibly, the initramfs signature).
- *
- * Return: a bpf_key pointer with an invalid key pointer set from the
- * pre-determined ID on success, a NULL pointer otherwise
- */
-__bpf_kfunc struct bpf_key *bpf_lookup_system_key(u64 id)
-{
- struct bpf_key *bkey;
-
- if (system_keyring_id_check(id) < 0)
- return NULL;
-
- bkey = kmalloc(sizeof(*bkey), GFP_ATOMIC);
- if (!bkey)
- return NULL;
-
- bkey->key = (struct key *)(unsigned long)id;
- bkey->has_ref = false;
-
- return bkey;
-}
-
-/**
- * bpf_key_put - decrement key reference count if key is valid and free bpf_key
- * @bkey: bpf_key structure
- *
- * Decrement the reference count of the key inside *bkey*, if the pointer
- * is valid, and free *bkey*.
- */
-__bpf_kfunc void bpf_key_put(struct bpf_key *bkey)
-{
- if (bkey->has_ref)
- key_put(bkey->key);
-
- kfree(bkey);
-}
-
-#ifdef CONFIG_SYSTEM_DATA_VERIFICATION
-/**
- * bpf_verify_pkcs7_signature - verify a PKCS#7 signature
- * @data_p: data to verify
- * @sig_p: signature of the data
- * @trusted_keyring: keyring with keys trusted for signature verification
- *
- * Verify the PKCS#7 signature *sig_ptr* against the supplied *data_ptr*
- * with keys in a keyring referenced by *trusted_keyring*.
- *
- * Return: 0 on success, a negative value on error.
- */
-__bpf_kfunc int bpf_verify_pkcs7_signature(struct bpf_dynptr *data_p,
- struct bpf_dynptr *sig_p,
- struct bpf_key *trusted_keyring)
-{
- struct bpf_dynptr_kern *data_ptr = (struct bpf_dynptr_kern *)data_p;
- struct bpf_dynptr_kern *sig_ptr = (struct bpf_dynptr_kern *)sig_p;
- const void *data, *sig;
- u32 data_len, sig_len;
- int ret;
-
- if (trusted_keyring->has_ref) {
- /*
- * Do the permission check deferred in bpf_lookup_user_key().
- * See bpf_lookup_user_key() for more details.
- *
- * A call to key_task_permission() here would be redundant, as
- * it is already done by keyring_search() called by
- * find_asymmetric_key().
- */
- ret = key_validate(trusted_keyring->key);
- if (ret < 0)
- return ret;
- }
-
- data_len = __bpf_dynptr_size(data_ptr);
- data = __bpf_dynptr_data(data_ptr, data_len);
- sig_len = __bpf_dynptr_size(sig_ptr);
- sig = __bpf_dynptr_data(sig_ptr, sig_len);
-
- return verify_pkcs7_signature(data, data_len, sig, sig_len,
- trusted_keyring->key,
- VERIFYING_UNSPECIFIED_SIGNATURE, NULL,
- NULL);
-}
-#endif /* CONFIG_SYSTEM_DATA_VERIFICATION */
-
-__bpf_kfunc_end_defs();
-
-BTF_KFUNCS_START(key_sig_kfunc_set)
-BTF_ID_FLAGS(func, bpf_lookup_user_key, KF_ACQUIRE | KF_RET_NULL | KF_SLEEPABLE)
-BTF_ID_FLAGS(func, bpf_lookup_system_key, KF_ACQUIRE | KF_RET_NULL)
-BTF_ID_FLAGS(func, bpf_key_put, KF_RELEASE)
-#ifdef CONFIG_SYSTEM_DATA_VERIFICATION
-BTF_ID_FLAGS(func, bpf_verify_pkcs7_signature, KF_SLEEPABLE)
-#endif
-BTF_KFUNCS_END(key_sig_kfunc_set)
-
-static const struct btf_kfunc_id_set bpf_key_sig_kfunc_set = {
- .owner = THIS_MODULE,
- .set = &key_sig_kfunc_set,
-};
-
-static int __init bpf_key_sig_kfuncs_init(void)
-{
- return register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING,
- &bpf_key_sig_kfunc_set);
-}
-
-late_initcall(bpf_key_sig_kfuncs_init);
-#endif /* CONFIG_KEYS */
-
static const struct bpf_func_proto *
bpf_tracing_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
{
projects / thirdparty / kernel / stable.git / commitdiff
