parse_efi_signature_list(9)

parse_efi_signature_list(9) 💖

okay bestie, so you're in the Kernel API Manual and you've stumbled onto parse_efi_signature_list — honestly? iconic. it parses an EFI signature list for certificates, and we're gonna get you through it together, no cap 🎀

---

✨ SYNOPSIS ✨

int parse_efi_signature_list (const char *source , const void *data ,
size_t size , efi_element_handler_t (*get_handler_for_guid)(const
efi_guid_t *) );

like, look at that signature. it's giving function-pointer realness and we're obsessed 🦋

---

🌸 ARGUMENTS 🌸

• source — the source of the key 💅 like, where's it from, bestie?
• data — the data blob to parse. this is the main character of the whole operation, fr fr 🫶
• size — the size of the data blob. yes, we need to know how much blob there is 😭
• get_handler_for_guid — get the handler func for the sig type (or NULL). lowkey the most interesting one of the bunch 👑

---

💜 DESCRIPTION 💜

so we're parsing an EFI signature list, looking for elements of interest. a list is made up of a series of sublists, right? and the way that works is: every element in a sublist is of the same type, but the sublists themselves can be of different types. slay, versatile, we love a flexible structure ✨

for each sublist encountered, the get_handler_for_guid function gets called with the type specifier GUID, and it returns either a pointer to a function that handles elements of that type — or NULL if the type is not of interest. so if the vibe check says "we don't care about this type," you get NULL, bye 👋

if the sublist is of interest, then each element gets passed to the handler function in turn. one by one. living its best life 🌈

⚠️ okay important: error EBADMSG is returned if the list doesn't parse correctly, and 0 is returned if the list was parsed correctly. and ngl? no error can be returned from the get_handler_for_guid function or the element handler function it returns. so don't go looking for error handling there, bestie, it's simply not the moment 💀

---

🔥 SEE ALSO 🔥

• Kernel file ./security/integrity/platform_certs/efi_parser.c — go read the source, it's literally right there iykyk 🧚

---

and that's the whole thing, bestie! if you ever forget, just remember: this gem lives in ./security/integrity/platform_certs/efi_parser.c and the page is dated October 2026 💖 catch you in the next manpage, mwah 🎀✨ periodt