bpf_verify_pkcs7_signature(9)

📦 version 7.3.1, in nixpkgs unstable

💖 NAME

bpf_verify_pkcs7_signature — verify a PKCS#7 signature. That's it, that's the whole job. It checks a signature and tells you if it's valid. Slay.

This is bpf_verify_pkcs7_signature(9) btw, from the Kernel API Manual — put some respect on the section number.

✨ SYNOPSIS

__bpf_kfunc int bpf_verify_pkcs7_signature (const struct bpf_dynptr
*data_p , const struct bpf_dynptr *sig_p , struct bpf_key
*trusted_keyring );

Look at that signature. Literally three pointers and a dream. __bpf_kfunc int, boom, done.

🫶 ARGUMENTS

Okay bestie, here's who's who in this little friend group:

  • data_p — the data you're verifying. The actual thing. The moment.
  • sig_p — the signature of the data. Like, the data's little handwritten autograph.
  • trusted_keyring — a keyring holding the keys that are trusted for signature verification. This is the VIP list. If your key isn't on the list, it's not getting in. 🙅‍♀️

🌸 DESCRIPTION

So here's the vibe check: this function verifies the PKCS#7 signature sig_ptr against the supplied data_ptr, using keys that live in a keyring referenced by trusted_keyring.

(And yes, the args are named data_p and sig_p up in ARGUMENTS but the description says sig_ptr and data_ptr — that's just how the page is written, I'm not out here fixing anything, I'm just reporting. 🙈)

The energy: data comes in, signature comes in, keyring comes in, and the function is like "do these match, and do I trust the key that made this signature?" If everyone's legit, it's a whole 🎀✨ moment. Obsessed.

🎀 RETURN

  • 0 on success — the good timeline 💅
  • a negative value on error — the bad timeline 😭

That's it. No secret third thing. Zero or negative. Iconic in its simplicity.

🦋 SEE ALSO

Kernel file: ./kernel/bpf/helpers.c — go read it, it's where the lore lives.

And now, the full squad roll call, in order, no gatekeeping, all of them 👑:

Forty-six besties and every single one of them matters. fr fr. 💜

That's the whole page, bestie. Courtesy of the fine people at ./kernel/bpf, dated October 2026, living in section 9 of the Kernel API Manual. Read it, love it, verify those signatures. mwah 🫶

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