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3492715683
This patch extends the BPF_PROG_LOAD command by adding three new fields
to `union bpf_attr` in the user-space API:
- signature: A pointer to the signature blob.
- signature_size: The size of the signature blob.
- keyring_id: The serial number of a loaded kernel keyring (e.g.,
the user or session keyring) containing the trusted public keys.
When a BPF program is loaded with a signature, the kernel:
1. Retrieves the trusted keyring using the provided `keyring_id`.
2. Verifies the supplied signature against the BPF program's
instruction buffer.
3. If the signature is valid and was generated by a key in the trusted
keyring, the program load proceeds.
4. If no signature is provided, the load proceeds as before, allowing
for backward compatibility. LSMs can chose to restrict unsigned
programs and implement a security policy.
5. If signature verification fails for any reason,
the program is not loaded.
Tested-by: syzbot@syzkaller.appspotmail.com
Signed-off-by: KP Singh <kpsingh@kernel.org>
Link: https://lore.kernel.org/r/20250921160120.9711-2-kpsingh@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/* Signature verification
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*
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* Copyright (C) 2014 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#ifndef _LINUX_VERIFICATION_H
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#define _LINUX_VERIFICATION_H
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#include <linux/errno.h>
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#include <linux/types.h>
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/*
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* Indicate that both builtin trusted keys and secondary trusted keys
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* should be used.
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*/
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#define VERIFY_USE_SECONDARY_KEYRING ((struct key *)1UL)
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#define VERIFY_USE_PLATFORM_KEYRING ((struct key *)2UL)
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static inline int system_keyring_id_check(u64 id)
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{
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if (id > (unsigned long)VERIFY_USE_PLATFORM_KEYRING)
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return -EINVAL;
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return 0;
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}
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/*
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* The use to which an asymmetric key is being put.
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*/
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enum key_being_used_for {
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VERIFYING_MODULE_SIGNATURE,
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VERIFYING_FIRMWARE_SIGNATURE,
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VERIFYING_KEXEC_PE_SIGNATURE,
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VERIFYING_KEY_SIGNATURE,
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VERIFYING_KEY_SELF_SIGNATURE,
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VERIFYING_UNSPECIFIED_SIGNATURE,
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VERIFYING_BPF_SIGNATURE,
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NR__KEY_BEING_USED_FOR
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};
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#ifdef CONFIG_SYSTEM_DATA_VERIFICATION
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struct key;
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struct pkcs7_message;
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extern int verify_pkcs7_signature(const void *data, size_t len,
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const void *raw_pkcs7, size_t pkcs7_len,
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struct key *trusted_keys,
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enum key_being_used_for usage,
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int (*view_content)(void *ctx,
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const void *data, size_t len,
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size_t asn1hdrlen),
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void *ctx);
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extern int verify_pkcs7_message_sig(const void *data, size_t len,
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struct pkcs7_message *pkcs7,
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struct key *trusted_keys,
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enum key_being_used_for usage,
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int (*view_content)(void *ctx,
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const void *data,
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size_t len,
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size_t asn1hdrlen),
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void *ctx);
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#ifdef CONFIG_SIGNED_PE_FILE_VERIFICATION
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extern int verify_pefile_signature(const void *pebuf, unsigned pelen,
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struct key *trusted_keys,
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enum key_being_used_for usage);
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#endif
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#endif /* CONFIG_SYSTEM_DATA_VERIFICATION */
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#endif /* _LINUX_VERIFY_PEFILE_H */
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