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sgx.h
/* SPDX-License-Identifier: GPL-2.0 */ /** * Copyright(c) 2016-20 Intel Corporation. * * Intel Software Guard Extensions (SGX) support. */ #ifndef _ASM_X86_SGX_H #define _ASM_X86_SGX_H #include <linux/bits.h> #include <linux/types.h> /* * This file contains both data structures defined by SGX architecture and Linux * defined software data structures and functions. The two should not be mixed * together for better readability. The architectural definitions come first. */ /* The SGX specific CPUID function. */ #define SGX_CPUID 0x12 /* EPC enumeration. */ #define SGX_CPUID_EPC 2 /* An invalid EPC section, i.e. the end marker. */ #define SGX_CPUID_EPC_INVALID 0x0 /* A valid EPC section. */ #define SGX_CPUID_EPC_SECTION 0x1 /* The bitmask for the EPC section type. */ #define SGX_CPUID_EPC_MASK GENMASK(3, 0) enum sgx_encls_function { ECREATE = 0x00, EADD = 0x01, EINIT = 0x02, EREMOVE = 0x03, EDGBRD = 0x04, EDGBWR = 0x05, EEXTEND = 0x06, ELDU = 0x08, EBLOCK = 0x09, EPA = 0x0A, EWB = 0x0B, ETRACK = 0x0C, EAUG = 0x0D, EMODPR = 0x0E, EMODT = 0x0F, }; /** * SGX_ENCLS_FAULT_FLAG - flag signifying an ENCLS return code is a trapnr * * ENCLS has its own (positive value) error codes and also generates * ENCLS specific #GP and #PF faults. And the ENCLS values get munged * with system error codes as everything percolates back up the stack. * Unfortunately (for us), we need to precisely identify each unique * error code, e.g. the action taken if EWB fails varies based on the * type of fault and on the exact SGX error code, i.e. we can't simply * convert all faults to -EFAULT. * * To make all three error types coexist, we set bit 30 to identify an * ENCLS fault. Bit 31 (technically bits N:31) is used to differentiate * between positive (faults and SGX error codes) and negative (system * error codes) values. */ #define SGX_ENCLS_FAULT_FLAG 0x40000000 /** * enum sgx_return_code - The return code type for ENCLS, ENCLU and ENCLV * %SGX_EPC_PAGE_CONFLICT: Page is being written by other ENCLS function. * %SGX_NOT_TRACKED: Previous ETRACK's shootdown sequence has not * been completed yet. * %SGX_CHILD_PRESENT SECS has child pages present in the EPC. * %SGX_INVALID_EINITTOKEN: EINITTOKEN is invalid and enclave signer's * public key does not match IA32_SGXLEPUBKEYHASH. * %SGX_PAGE_NOT_MODIFIABLE: The EPC page cannot be modified because it * is in the PENDING or MODIFIED state. * %SGX_UNMASKED_EVENT: An unmasked event, e.g. INTR, was received */ enum sgx_return_code { SGX_EPC_PAGE_CONFLICT = 7, SGX_NOT_TRACKED = 11, SGX_CHILD_PRESENT = 13, SGX_INVALID_EINITTOKEN = 16, SGX_PAGE_NOT_MODIFIABLE = 20, SGX_UNMASKED_EVENT = 128, }; /* The modulus size for 3072-bit RSA keys. */ #define SGX_MODULUS_SIZE 384 /** * enum sgx_miscselect - additional information to an SSA frame * %SGX_MISC_EXINFO: Report #PF or #GP to the SSA frame. * * Save State Area (SSA) is a stack inside the enclave used to store processor * state when an exception or interrupt occurs. This enum defines additional * information stored to an SSA frame. */ enum sgx_miscselect { SGX_MISC_EXINFO = BIT(0), }; #define SGX_MISC_RESERVED_MASK GENMASK_ULL(63, 1) #define SGX_SSA_GPRS_SIZE 184 #define SGX_SSA_MISC_EXINFO_SIZE 16 /** * enum sgx_attributes - the attributes field in &struct sgx_secs * %SGX_ATTR_INIT: Enclave can be entered (is initialized). * %SGX_ATTR_DEBUG: Allow ENCLS(EDBGRD) and ENCLS(EDBGWR). * %SGX_ATTR_MODE64BIT: Tell that this a 64-bit enclave. * %SGX_ATTR_PROVISIONKEY: Allow to use provisioning keys for remote * attestation. * %SGX_ATTR_KSS: Allow to use key separation and sharing (KSS). * %SGX_ATTR_EINITTOKENKEY: Allow to use token signing key that is used to * sign cryptographic tokens that can be passed to * EINIT as an authorization to run an enclave. * %SGX_ATTR_ASYNC_EXIT_NOTIFY: Allow enclaves to be notified after an * asynchronous exit has occurred. */ enum sgx_attribute { SGX_ATTR_INIT = BIT(0), SGX_ATTR_DEBUG = BIT(1), SGX_ATTR_MODE64BIT = BIT(2), /* BIT(3) is reserved */ SGX_ATTR_PROVISIONKEY = BIT(4), SGX_ATTR_EINITTOKENKEY = BIT(5), /* BIT(6) is for CET */ SGX_ATTR_KSS = BIT(7), /* BIT(8) is reserved */ /* BIT(9) is reserved */ SGX_ATTR_ASYNC_EXIT_NOTIFY = BIT(10), }; #define SGX_ATTR_RESERVED_MASK (BIT_ULL(3) | \ BIT_ULL(6) | \ BIT_ULL(8) | \ BIT_ULL(9) | \ GENMASK_ULL(63, 11)) #define SGX_ATTR_UNPRIV_MASK (SGX_ATTR_DEBUG | \ SGX_ATTR_MODE64BIT | \ SGX_ATTR_KSS | \ SGX_ATTR_ASYNC_EXIT_NOTIFY) #define SGX_ATTR_PRIV_MASK (SGX_ATTR_PROVISIONKEY | \ SGX_ATTR_EINITTOKENKEY) /** * struct sgx_secs - SGX Enclave Control Structure (SECS) * @size: size of the address space * @base: base address of the address space * @ssa_frame_size: size of an SSA frame * @miscselect: additional information stored to an SSA frame * @attributes: attributes for enclave * @xfrm: XSave-Feature Request Mask (subset of XCR0) * @mrenclave: SHA256-hash of the enclave contents * @mrsigner: SHA256-hash of the public key used to sign the SIGSTRUCT * @config_id: a user-defined value that is used in key derivation * @isv_prod_id: a user-defined value that is used in key derivation * @isv_svn: a user-defined value that is used in key derivation * @config_svn: a user-defined value that is used in key derivation * * SGX Enclave Control Structure (SECS) is a special enclave page that is not * visible in the address space. In fact, this structure defines the address * range and other global attributes for the enclave and it is the first EPC * page created for any enclave. It is moved from a temporary buffer to an EPC * by the means of ENCLS[ECREATE] function. */ struct sgx_secs { u64 size; u64 base; u32 ssa_frame_size; u32 miscselect; u8 reserved1[24]; u64 attributes; u64 xfrm; u32 mrenclave[8]; u8 reserved2[32]; u32 mrsigner[8]; u8 reserved3[32]; u32 config_id[16]; u16 isv_prod_id; u16 isv_svn; u16 config_svn; u8 reserved4[3834]; } __packed; /** * enum sgx_tcs_flags - execution flags for TCS * %SGX_TCS_DBGOPTIN: If enabled allows single-stepping and breakpoints * inside an enclave. It is cleared by EADD but can * be set later with EDBGWR. */ enum sgx_tcs_flags { SGX_TCS_DBGOPTIN = 0x01, }; #define SGX_TCS_RESERVED_MASK GENMASK_ULL(63, 1) #define SGX_TCS_RESERVED_SIZE 4024 /** * struct sgx_tcs - Thread Control Structure (TCS) * @state: used to mark an entered TCS * @flags: execution flags (cleared by EADD) * @ssa_offset: SSA stack offset relative to the enclave base * @ssa_index: the current SSA frame index (cleard by EADD) * @nr_ssa_frames: the number of frame in the SSA stack * @entry_offset: entry point offset relative to the enclave base * @exit_addr: address outside the enclave to exit on an exception or * interrupt * @fs_offset: offset relative to the enclave base to become FS * segment inside the enclave * @gs_offset: offset relative to the enclave base to become GS * segment inside the enclave * @fs_limit: size to become a new FS-limit (only 32-bit enclaves) * @gs_limit: size to become a new GS-limit (only 32-bit enclaves) * * Thread Control Structure (TCS) is an enclave page visible in its address * space that defines an entry point inside the enclave. A thread enters inside * an enclave by supplying address of TCS to ENCLU(EENTER). A TCS can be entered * by only one thread at a time. */ struct sgx_tcs { u64 state; u64 flags; u64 ssa_offset; u32 ssa_index; u32 nr_ssa_frames; u64 entry_offset; u64 exit_addr; u64 fs_offset; u64 gs_offset; u32 fs_limit; u32 gs_limit; u8 reserved[SGX_TCS_RESERVED_SIZE]; } __packed; /** * struct sgx_pageinfo - an enclave page descriptor * @addr: address of the enclave page * @contents: pointer to the page contents * @metadata: pointer either to a SECINFO or PCMD instance * @secs: address of the SECS page */ struct sgx_pageinfo { u64 addr; u64 contents; u64 metadata; u64 secs; } __packed __aligned(32); /** * enum sgx_page_type - bits in the SECINFO flags defining the page type * %SGX_PAGE_TYPE_SECS: a SECS page * %SGX_PAGE_TYPE_TCS: a TCS page * %SGX_PAGE_TYPE_REG: a regular page * %SGX_PAGE_TYPE_VA: a VA page * %SGX_PAGE_TYPE_TRIM: a page in trimmed state * * Make sure when making changes to this enum that its values can still fit * in the bitfield within &struct sgx_encl_page */ enum sgx_page_type { SGX_PAGE_TYPE_SECS, SGX_PAGE_TYPE_TCS, SGX_PAGE_TYPE_REG, SGX_PAGE_TYPE_VA, SGX_PAGE_TYPE_TRIM, }; #define SGX_NR_PAGE_TYPES 5 #define SGX_PAGE_TYPE_MASK GENMASK(7, 0) /** * enum sgx_secinfo_flags - the flags field in &struct sgx_secinfo * %SGX_SECINFO_R: allow read * %SGX_SECINFO_W: allow write * %SGX_SECINFO_X: allow execution * %SGX_SECINFO_SECS: a SECS page * %SGX_SECINFO_TCS: a TCS page * %SGX_SECINFO_REG: a regular page * %SGX_SECINFO_VA: a VA page * %SGX_SECINFO_TRIM: a page in trimmed state */ enum sgx_secinfo_flags { SGX_SECINFO_R = BIT(0), SGX_SECINFO_W = BIT(1), SGX_SECINFO_X = BIT(2), SGX_SECINFO_SECS = (SGX_PAGE_TYPE_SECS << 8), SGX_SECINFO_TCS = (SGX_PAGE_TYPE_TCS << 8), SGX_SECINFO_REG = (SGX_PAGE_TYPE_REG << 8), SGX_SECINFO_VA = (SGX_PAGE_TYPE_VA << 8), SGX_SECINFO_TRIM = (SGX_PAGE_TYPE_TRIM << 8), }; #define SGX_SECINFO_PERMISSION_MASK GENMASK_ULL(2, 0) #define SGX_SECINFO_PAGE_TYPE_MASK (SGX_PAGE_TYPE_MASK << 8) #define SGX_SECINFO_RESERVED_MASK ~(SGX_SECINFO_PERMISSION_MASK | \ SGX_SECINFO_PAGE_TYPE_MASK) /** * struct sgx_secinfo - describes attributes of an EPC page * @flags: permissions and type * * Used together with ENCLS leaves that add or modify an EPC page to an * enclave to define page permissions and type. */ struct sgx_secinfo { u64 flags; u8 reserved[56]; } __packed __aligned(64); #define SGX_PCMD_RESERVED_SIZE 40 /** * struct sgx_pcmd - Paging Crypto Metadata (PCMD) * @enclave_id: enclave identifier * @mac: MAC over PCMD, page contents and isvsvn * * PCMD is stored for every swapped page to the regular memory. When ELDU loads * the page back it recalculates the MAC by using a isvsvn number stored in a * VA page. Together these two structures bring integrity and rollback * protection. */ struct sgx_pcmd { struct sgx_secinfo secinfo; u64 enclave_id; u8 reserved[SGX_PCMD_RESERVED_SIZE]; u8 mac[16]; } __packed __aligned(128); #define SGX_SIGSTRUCT_RESERVED1_SIZE 84 #define SGX_SIGSTRUCT_RESERVED2_SIZE 20 #define SGX_SIGSTRUCT_RESERVED3_SIZE 32 #define SGX_SIGSTRUCT_RESERVED4_SIZE 12 /** * struct sgx_sigstruct_header - defines author of the enclave * @header1: constant byte string * @vendor: must be either 0x0000 or 0x8086 * @date: YYYYMMDD in BCD * @header2: constant byte string * @swdefined: software defined value */ struct sgx_sigstruct_header { u64 header1[2]; u32 vendor; u32 date; u64 header2[2]; u32 swdefined; u8 reserved1[84]; } __packed; /** * struct sgx_sigstruct_body - defines contents of the enclave * @miscselect: additional information stored to an SSA frame * @misc_mask: required miscselect in SECS * @attributes: attributes for enclave * @xfrm: XSave-Feature Request Mask (subset of XCR0) * @attributes_mask: required attributes in SECS * @xfrm_mask: required XFRM in SECS * @mrenclave: SHA256-hash of the enclave contents * @isvprodid: a user-defined value that is used in key derivation * @isvsvn: a user-defined value that is used in key derivation */ 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; } __packed; /** * struct sgx_sigstruct - an enclave signature * @header: defines author of the enclave * @modulus: the modulus of the public key * @exponent: the exponent of the public key * @signature: the signature calculated over the fields except modulus, * @body: defines contents of the enclave * @q1: a value used in RSA signature verification * @q2: a value used in RSA signature verification * * Header and body are the parts that are actual signed. The remaining fields * define the signature of the enclave. */ struct sgx_sigstruct { struct sgx_sigstruct_header header; u8 modulus[SGX_MODULUS_SIZE]; u32 exponent; u8 signature[SGX_MODULUS_SIZE]; struct sgx_sigstruct_body body; u8 reserved4[12]; u8 q1[SGX_MODULUS_SIZE]; u8 q2[SGX_MODULUS_SIZE]; } __packed; #define SGX_LAUNCH_TOKEN_SIZE 304 /* * Do not put any hardware-defined SGX structure representations below this * comment! */ #ifdef CONFIG_X86_SGX_KVM int sgx_virt_ecreate(struct sgx_pageinfo *pageinfo, void __user *secs, int *trapnr); int sgx_virt_einit(void __user *sigstruct, void __user *token, void __user *secs, u64 *lepubkeyhash, int *trapnr); #endif int sgx_set_attribute(unsigned long *allowed_attributes, unsigned int attribute_fd); #endif /* _ASM_X86_SGX_H */
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