ubifs_sb_verify_signature(9)

💖 ubifs_sb_verify_signature 💖

okay bestie, so this page is ubifs_sb_verify_signature(9) from the Kernel API Manual, and it's literally the vibe check for a superblock's signature ✨

🎀 NAME 🎀

ubifs_sb_verify_signature — verify the signature of a superblock 🫶

🌸 SYNOPSIS 🌸

int ubifs_sb_verify_signature (struct ubifs_info *c , const struct
       ubifs_sb_node *sup );

🦋 ARGUMENTS 🦋

• c — the UBIFS file-system description object, your main character struct 💅
• sup — the superblock node itself, the one getting checked 👑

✨ DESCRIPTION ✨

So here's the tea: to support offline signed images, the superblock can be signed with a PKCS#7 signature 🔥 The signature is placed directly behind the superblock node, chilling in an ubifs_sig_node 🌈

Returns 0 when the signature can be successfully verified, or a negative error code if not 😭

no cap, a negative return means the signature did not verify — that's the whole point of the check 💀

👑 SEE ALSO 👑

Kernel file ./fs/ubifs/auth.c, plus these iconic homies:

• __ubifs_node_calc_hash(9)
• ubifs_hash_calc_hmac(9)
• ubifs_prepare_auth_node(9)
• __ubifs_hash_get_desc(9)
• ubifs_bad_hash(9)
• __ubifs_node_check_hash(9)
• ubifs_init_authentication(9)
• __ubifs_exit_authentication(9)
• ubifs_node_calc_hmac(9)
• __ubifs_node_insert_hmac(9)
• __ubifs_node_verify_hmac(9)
• ubifs_hmac_wkm(9)

and that's the whole page, bestie, you ate it 🍓 this little baddie lives in ./fs/ubifs, it's dated October 2026, and it's filed under ubifs_sb_verify_signature(9) — slay 💜🧚

⭐ periodt ⭐