BPF signature verification #5385
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June 1, 2025 23:44
This introduces signature verification for eBPF programs inside of the bpf subsystem. Two signature validation schemes are included, one that only checks the instruction buffer, and another that checks over a hash chain constructed from the program and a list of maps. The alternative algorithm is designed to provide support to scenarios where having self-aborting light-skeletons or signature checking living outside the kernel-proper is insufficient or undesirable. An abstract hash method is introduced to allow calculating the hash of maps, only arrays are implemented at this time. A simple UAPI is introduced to provide passing signature information. The signature check is performed before the call to security_bpf_prog_load. This allows the LSM subsystem to be clued into the result of the signature check, whilst granting knowledge of the method and apparatus which was employed. Signed-off-by: Blaise Boscaccy <[email protected]>
This adds optional signature UAPI support to lskels. Additionally map freezing support is added as well. Signed-off-by: Blaise Boscaccy <[email protected]>
This introduces hash-chain signature support into bpftool. The signature generated code was adapted from sign-file and follows a similar set of command line switches. The algorithm used here supports the signature of both the loader program and it's map containing the target program. 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=967145 irrelevant now. Closing PR. |
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Pull request for series with
subject: BPF signature verification
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=967145