tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/* Copyright(c) 2016-20 Intel Corporation. */
3
4#include <stddef.h>
5#include "defines.h"
6
7/*
8 * Data buffer spanning two pages that will be placed first in .data
9 * segment. Even if not used internally the second page is needed by
10 * external test manipulating page permissions.
11 */
12static uint8_t encl_buffer[8192] = { 1 };
13
14enum sgx_enclu_function {
15 EACCEPT = 0x5,
16 EMODPE = 0x6,
17};
18
19static void do_encl_emodpe(void *_op)
20{
21 struct sgx_secinfo secinfo __aligned(sizeof(struct sgx_secinfo)) = {0};
22 struct encl_op_emodpe *op = _op;
23
24 secinfo.flags = op->flags;
25
26 asm volatile(".byte 0x0f, 0x01, 0xd7"
27 :
28 : "a" (EMODPE),
29 "b" (&secinfo),
30 "c" (op->epc_addr));
31}
32
33static void do_encl_eaccept(void *_op)
34{
35 struct sgx_secinfo secinfo __aligned(sizeof(struct sgx_secinfo)) = {0};
36 struct encl_op_eaccept *op = _op;
37 int rax;
38
39 secinfo.flags = op->flags;
40
41 asm volatile(".byte 0x0f, 0x01, 0xd7"
42 : "=a" (rax)
43 : "a" (EACCEPT),
44 "b" (&secinfo),
45 "c" (op->epc_addr));
46
47 op->ret = rax;
48}
49
50static void *memcpy(void *dest, const void *src, size_t n)
51{
52 size_t i;
53
54 for (i = 0; i < n; i++)
55 ((char *)dest)[i] = ((char *)src)[i];
56
57 return dest;
58}
59
60static void *memset(void *dest, int c, size_t n)
61{
62 size_t i;
63
64 for (i = 0; i < n; i++)
65 ((char *)dest)[i] = c;
66
67 return dest;
68}
69
70static void do_encl_init_tcs_page(void *_op)
71{
72 struct encl_op_init_tcs_page *op = _op;
73 void *tcs = (void *)op->tcs_page;
74 uint32_t val_32;
75
76 memset(tcs, 0, 16); /* STATE and FLAGS */
77 memcpy(tcs + 16, &op->ssa, 8); /* OSSA */
78 memset(tcs + 24, 0, 4); /* CSSA */
79 val_32 = 1;
80 memcpy(tcs + 28, &val_32, 4); /* NSSA */
81 memcpy(tcs + 32, &op->entry, 8); /* OENTRY */
82 memset(tcs + 40, 0, 24); /* AEP, OFSBASE, OGSBASE */
83 val_32 = 0xFFFFFFFF;
84 memcpy(tcs + 64, &val_32, 4); /* FSLIMIT */
85 memcpy(tcs + 68, &val_32, 4); /* GSLIMIT */
86 memset(tcs + 72, 0, 4024); /* Reserved */
87}
88
89static void do_encl_op_put_to_buf(void *op)
90{
91 struct encl_op_put_to_buf *op2 = op;
92
93 memcpy(&encl_buffer[0], &op2->value, 8);
94}
95
96static void do_encl_op_get_from_buf(void *op)
97{
98 struct encl_op_get_from_buf *op2 = op;
99
100 memcpy(&op2->value, &encl_buffer[0], 8);
101}
102
103static void do_encl_op_put_to_addr(void *_op)
104{
105 struct encl_op_put_to_addr *op = _op;
106
107 memcpy((void *)op->addr, &op->value, 8);
108}
109
110static void do_encl_op_get_from_addr(void *_op)
111{
112 struct encl_op_get_from_addr *op = _op;
113
114 memcpy(&op->value, (void *)op->addr, 8);
115}
116
117static void do_encl_op_nop(void *_op)
118{
119
120}
121
122void encl_body(void *rdi, void *rsi)
123{
124 const void (*encl_op_array[ENCL_OP_MAX])(void *) = {
125 do_encl_op_put_to_buf,
126 do_encl_op_get_from_buf,
127 do_encl_op_put_to_addr,
128 do_encl_op_get_from_addr,
129 do_encl_op_nop,
130 do_encl_eaccept,
131 do_encl_emodpe,
132 do_encl_init_tcs_page,
133 };
134
135 struct encl_op_header *op = (struct encl_op_header *)rdi;
136
137 if (op->type < ENCL_OP_MAX)
138 (*encl_op_array[op->type])(op);
139}