BPF signature hash chains #6068
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October 2, 2025 14:31
This patch introduces hash chain support for signature verification of arbitrary bpf map objects which was described here: https://lore.kernel.org/linux-security-module/[email protected]/ The UAPI is extended to allow for in-kernel checking of maps passed in via the fd_array. A hash chain is constructed from the maps, in order specified by the signature_maps field. The hash chain is terminated with the hash of the program itself. Tested-by: [email protected] Signed-off-by: Blaise Boscaccy <[email protected]>
Convert an existing signed lskel test to use the newly introduced map signature hash-chain support added to libbpf. Signed-off-by: Blaise Boscaccy <[email protected]>
Add a new mode of operation for program loading which supports the generation of signed hash chains for light skeletons, using the new signed map hash chain UAPI additions. e.g bpftool prog load -S -M -k <private_key> -i <identity_cert> fentry_test.bpf.o The -M or --sign-maps command line switch is introduced. It generates a hash chain such that: H(program, maps) = sha256(sha256(program), sha256(map[0])) Signed-off-by: Blaise Boscaccy <[email protected]>
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=1007203 irrelevant now. Closing PR. |
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Pull request for series with
subject: BPF signature hash chains
version: 2
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1007203