projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 53555e2b TJB |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | ||
| 3 | #ifndef _PKEYS_X86_H | |
| 4 | #define _PKEYS_X86_H | |
| 5 | ||
| 6 | #ifdef __i386__ | |
| 7 | ||
| 8 | #ifndef SYS_mprotect_key | |
| 9 | # define SYS_mprotect_key 380 | |
| 10 | #endif | |
| 11 | ||
| 12 | #ifndef SYS_pkey_alloc | |
| 13 | # define SYS_pkey_alloc 381 | |
| 14 | # define SYS_pkey_free 382 | |
| 15 | #endif | |
| 16 | ||
| 17 | #define REG_IP_IDX REG_EIP | |
| 18 | #define si_pkey_offset 0x14 | |
| 19 | ||
| 20 | #else | |
| 21 | ||
| 22 | #ifndef SYS_mprotect_key | |
| 23 | # define SYS_mprotect_key 329 | |
| 24 | #endif | |
| 25 | ||
| 26 | #ifndef SYS_pkey_alloc | |
| 27 | # define SYS_pkey_alloc 330 | |
| 28 | # define SYS_pkey_free 331 | |
| 29 | #endif | |
| 30 | ||
| 31 | #define REG_IP_IDX REG_RIP | |
| 32 | #define si_pkey_offset 0x20 | |
| 33 | ||
| 34 | #endif | |
| 35 | ||
| 36 | #ifndef PKEY_DISABLE_ACCESS | |
| 37 | # define PKEY_DISABLE_ACCESS 0x1 | |
| 38 | #endif | |
| 39 | ||
| 40 | #ifndef PKEY_DISABLE_WRITE | |
| 41 | # define PKEY_DISABLE_WRITE 0x2 | |
| 42 | #endif | |
| 43 | ||
| 44 | #define NR_PKEYS 16 | |
| 604c496b | 45 | #define NR_RESERVED_PKEYS 2 /* pkey-0 and exec-only-pkey */ |
| 53555e2b TJB |
46 | #define PKEY_BITS_PER_PKEY 2 |
| 47 | #define HPAGE_SIZE (1UL<<21) | |
| 48 | #define PAGE_SIZE 4096 | |
| 49 | #define MB (1<<20) | |
| 50 | ||
| 51 | static inline void __page_o_noops(void) | |
| 52 | { | |
| 53 | /* 8-bytes of instruction * 512 bytes = 1 page */ | |
| 54 | asm(".rept 512 ; nopl 0x7eeeeeee(%eax) ; .endr"); | |
| 55 | } | |
| 56 | ||
| 4dbdd947 | 57 | static inline u64 __read_pkey_reg(void) |
| 53555e2b TJB |
58 | { |
| 59 | unsigned int eax, edx; | |
| 60 | unsigned int ecx = 0; | |
| 4dbdd947 | 61 | unsigned pkey_reg; |
| 53555e2b TJB |
62 | |
| 63 | asm volatile(".byte 0x0f,0x01,0xee\n\t" | |
| 64 | : "=a" (eax), "=d" (edx) | |
| 65 | : "c" (ecx)); | |
| 66 | pkey_reg = eax; | |
| 67 | return pkey_reg; | |
| 68 | } | |
| 69 | ||
| 4dbdd947 | 70 | static inline void __write_pkey_reg(u64 pkey_reg) |
| 53555e2b TJB |
71 | { |
| 72 | unsigned int eax = pkey_reg; | |
| 73 | unsigned int ecx = 0; | |
| 74 | unsigned int edx = 0; | |
| 75 | ||
| 4dbdd947 | 76 | dprintf4("%s() changing %016llx to %016llx\n", __func__, |
| 53555e2b TJB |
77 | __read_pkey_reg(), pkey_reg); |
| 78 | asm volatile(".byte 0x0f,0x01,0xef\n\t" | |
| 79 | : : "a" (eax), "c" (ecx), "d" (edx)); | |
| 80 | assert(pkey_reg == __read_pkey_reg()); | |
| 81 | } | |
| 82 | ||
| 53555e2b TJB |
83 | /* Intel-defined CPU features, CPUID level 0x00000007:0 (ecx) */ |
| 84 | #define X86_FEATURE_PKU (1<<3) /* Protection Keys for Userspace */ | |
| 85 | #define X86_FEATURE_OSPKE (1<<4) /* OS Protection Keys Enable */ | |
| 86 | ||
| 94c8a223 | 87 | static inline int cpu_has_pkeys(void) |
| 53555e2b TJB |
88 | { |
| 89 | unsigned int eax; | |
| 90 | unsigned int ebx; | |
| 91 | unsigned int ecx; | |
| 92 | unsigned int edx; | |
| 93 | ||
| 0dba8dae | 94 | __cpuid_count(0x7, 0x0, eax, ebx, ecx, edx); |
| 53555e2b TJB |
95 | |
| 96 | if (!(ecx & X86_FEATURE_PKU)) { | |
| 97 | dprintf2("cpu does not have PKU\n"); | |
| 98 | return 0; | |
| 99 | } | |
| 100 | if (!(ecx & X86_FEATURE_OSPKE)) { | |
| 101 | dprintf2("cpu does not have OSPKE\n"); | |
| 102 | return 0; | |
| 103 | } | |
| 104 | return 1; | |
| 105 | } | |
| 106 | ||
| 6ea25770 KH |
107 | static inline int cpu_max_xsave_size(void) |
| 108 | { | |
| 109 | unsigned long XSTATE_CPUID = 0xd; | |
| 110 | unsigned int eax; | |
| 111 | unsigned int ebx; | |
| 112 | unsigned int ecx; | |
| 113 | unsigned int edx; | |
| 114 | ||
| 115 | __cpuid_count(XSTATE_CPUID, 0, eax, ebx, ecx, edx); | |
| 116 | return ecx; | |
| 117 | } | |
| 118 | ||
| 0c416bca SD |
119 | static inline u32 pkey_bit_position(int pkey) |
| 120 | { | |
| 121 | return pkey * PKEY_BITS_PER_PKEY; | |
| 122 | } | |
| 123 | ||
| 53555e2b TJB |
124 | #define XSTATE_PKEY_BIT (9) |
| 125 | #define XSTATE_PKEY 0x200 | |
| d892454b | 126 | #define XSTATE_BV_OFFSET 512 |
| 53555e2b TJB |
127 | |
| 128 | int pkey_reg_xstate_offset(void) | |
| 129 | { | |
| 130 | unsigned int eax; | |
| 131 | unsigned int ebx; | |
| 132 | unsigned int ecx; | |
| 133 | unsigned int edx; | |
| 134 | int xstate_offset; | |
| 135 | int xstate_size; | |
| 136 | unsigned long XSTATE_CPUID = 0xd; | |
| 137 | int leaf; | |
| 138 | ||
| 139 | /* assume that XSTATE_PKEY is set in XCR0 */ | |
| 140 | leaf = XSTATE_PKEY_BIT; | |
| 141 | { | |
| 0dba8dae | 142 | __cpuid_count(XSTATE_CPUID, leaf, eax, ebx, ecx, edx); |
| 53555e2b TJB |
143 | |
| 144 | if (leaf == XSTATE_PKEY_BIT) { | |
| 145 | xstate_offset = ebx; | |
| 146 | xstate_size = eax; | |
| 147 | } | |
| 148 | } | |
| 149 | ||
| 150 | if (xstate_size == 0) { | |
| 151 | printf("could not find size/offset of PKEY in xsave state\n"); | |
| 152 | return 0; | |
| 153 | } | |
| 154 | ||
| 155 | return xstate_offset; | |
| 156 | } | |
| 157 | ||
| 604c496b RP |
158 | static inline int get_arch_reserved_keys(void) |
| 159 | { | |
| 160 | return NR_RESERVED_PKEYS; | |
| 161 | } | |
| 162 | ||
| 163 | void expect_fault_on_read_execonly_key(void *p1, int pkey) | |
| 164 | { | |
| 165 | int ptr_contents; | |
| 166 | ||
| 167 | ptr_contents = read_ptr(p1); | |
| 168 | dprintf2("ptr (%p) contents@%d: %x\n", p1, __LINE__, ptr_contents); | |
| 169 | expected_pkey_fault(pkey); | |
| 170 | } | |
| 171 | ||
| 6e2c2d0f RP |
172 | void *malloc_pkey_with_mprotect_subpage(long size, int prot, u16 pkey) |
| 173 | { | |
| 174 | return PTR_ERR_ENOTSUP; | |
| 175 | } | |
| 176 | ||
| 53555e2b | 177 | #endif /* _PKEYS_X86_H */ |