STRUCT SGX_SIGSTRUCT_BODY(9)

💅 struct sgx_sigstruct_body(9) ✨

okay bestie, welcome to the kernel API manual, section 9 — we're looking at struct sgx_sigstruct_body(9) today and honestly? it's giving "the actual personality of the enclave" 🫶. This is where an SGX enclave's whole identity lives — what it is, what it's allowed to do, and the hash of everything inside it. Let's get into it.

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🌸 NAME 🌸

struct sgx_sigstruct_body — literally defines the contents of the enclave 💖 (yes, that's the whole job, and it takes it very seriously)

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🎀 SYNOPSIS 🎀

struct sgx_sigstruct_body {
    u32 miscselect;
    u32 misc_mask;
    u8 reserved2[20];
    u64 attributes;
    u64 xfrm;
    u64 attributes_mask;
    u64 xfrm_mask;
    u8 mrenclave[32];
    u8 reserved3[32];
    u16 isvprodid;
    u16 isvsvn;
 };

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🦋 MEMBERS 🦋

so each field is a whole little moment, let me introduce them all:

💜 the fields

• miscselect — extra info that gets stored to an SSA frame. it's the little extras, yk?
• misc_mask — the required miscselect in SECS. like, the non-negotiable bits 🔥
• attributes — the attributes for the enclave. its whole vibe spec.
• xfrm — XSave-Feature Request Mask (a subset of XCR0, no cap 🙈)
• attributes_mask — the required attributes in SECS
• xfrm_mask — the required XFRM in SECS
• mrenclave — SHA256-hash of the enclave contents. the enclave's fingerprint, its main character ID 💅
• isvprodid — a user-defined value that is used in key derivation ⭐
• isvsvn — a user-defined value that is used in key derivation ⭐ (yes bestie, same description as its sibling — they're a matching set, periodt)

💀 heads up: reserved2[20] and reserved3[32] are chilling in there too — reserved, so hands off, don't touch, they're not for us 🍓

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🌈 SEE ALSO 🌈

Kernel file ./arch/x86/include/asm/sgx.h and its whole friend group — go read these next, iykyk:

• SGX_ENCLS_FAULT_FLAG(9)
• enum sgx_return_code(9)
• enum sgx_miscselect(9)
• enum sgx_attribute(9)
• struct sgx_secs(9)
• enum sgx_tcs_flags(9)
• struct sgx_tcs(9)
• struct sgx_pageinfo(9)
• enum sgx_page_type(9)
• enum sgx_secinfo_flags(9)
• struct sgx_secinfo(9)
• struct sgx_pcmd(9)
• struct sgx_sigstruct_header(9)
• struct sgx_sigstruct(9)

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and that's the whole page, bestie, you ate that 🧚✨ sign-off time: this came from ./arch/x86/include/asm, dated October 2026, and it's page struct sgx_sigstruct_body(9) of the Kernel API Manual. mwah 💋👑