selftests/sgx/test_encl.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*  Copyright(c) 2016-20 Intel Corporation. */
0003
0004 #include <stddef.h>
0005 #include "defines.h"
0006
0007 /*
0008  * Data buffer spanning two pages that will be placed first in .data
0009  * segment. Even if not used internally the second page is needed by
0010  * external test manipulating page permissions.
0011  */
0012 static uint8_t encl_buffer[8192] = { 1 };
0013
0014 enum sgx_enclu_function {
0015     EACCEPT = 0x5,
0016     EMODPE = 0x6,
0017 };
0018
0019 static void do_encl_emodpe(void *_op)
0020 {
0021     struct sgx_secinfo secinfo __aligned(sizeof(struct sgx_secinfo)) = {0};
0022     struct encl_op_emodpe *op = _op;
0023
0024     secinfo.flags = op->flags;
0025
0026     asm volatile(".byte 0x0f, 0x01, 0xd7"
0027                 :
0028                 : "a" (EMODPE),
0029                   "b" (&secinfo),
0030                   "c" (op->epc_addr));
0031 }
0032
0033 static void do_encl_eaccept(void *_op)
0034 {
0035     struct sgx_secinfo secinfo __aligned(sizeof(struct sgx_secinfo)) = {0};
0036     struct encl_op_eaccept *op = _op;
0037     int rax;
0038
0039     secinfo.flags = op->flags;
0040
0041     asm volatile(".byte 0x0f, 0x01, 0xd7"
0042                 : "=a" (rax)
0043                 : "a" (EACCEPT),
0044                   "b" (&secinfo),
0045                   "c" (op->epc_addr));
0046
0047     op->ret = rax;
0048 }
0049
0050 static void *memcpy(void *dest, const void *src, size_t n)
0051 {
0052     size_t i;
0053
0054     for (i = 0; i < n; i++)
0055         ((char *)dest)[i] = ((char *)src)[i];
0056
0057     return dest;
0058 }
0059
0060 static void *memset(void *dest, int c, size_t n)
0061 {
0062     size_t i;
0063
0064     for (i = 0; i < n; i++)
0065         ((char *)dest)[i] = c;
0066
0067     return dest;
0068 }
0069
0070 static void do_encl_init_tcs_page(void *_op)
0071 {
0072     struct encl_op_init_tcs_page *op = _op;
0073     void *tcs = (void *)op->tcs_page;
0074     uint32_t val_32;
0075
0076     memset(tcs, 0, 16);         /* STATE and FLAGS */
0077     memcpy(tcs + 16, &op->ssa, 8);      /* OSSA */
0078     memset(tcs + 24, 0, 4);         /* CSSA */
0079     val_32 = 1;
0080     memcpy(tcs + 28, &val_32, 4);       /* NSSA */
0081     memcpy(tcs + 32, &op->entry, 8);    /* OENTRY */
0082     memset(tcs + 40, 0, 24);        /* AEP, OFSBASE, OGSBASE */
0083     val_32 = 0xFFFFFFFF;
0084     memcpy(tcs + 64, &val_32, 4);       /* FSLIMIT */
0085     memcpy(tcs + 68, &val_32, 4);       /* GSLIMIT */
0086     memset(tcs + 72, 0, 4024);      /* Reserved */
0087 }
0088
0089 static void do_encl_op_put_to_buf(void *op)
0090 {
0091     struct encl_op_put_to_buf *op2 = op;
0092
0093     memcpy(&encl_buffer[0], &op2->value, 8);
0094 }
0095
0096 static void do_encl_op_get_from_buf(void *op)
0097 {
0098     struct encl_op_get_from_buf *op2 = op;
0099
0100     memcpy(&op2->value, &encl_buffer[0], 8);
0101 }
0102
0103 static void do_encl_op_put_to_addr(void *_op)
0104 {
0105     struct encl_op_put_to_addr *op = _op;
0106
0107     memcpy((void *)op->addr, &op->value, 8);
0108 }
0109
0110 static void do_encl_op_get_from_addr(void *_op)
0111 {
0112     struct encl_op_get_from_addr *op = _op;
0113
0114     memcpy(&op->value, (void *)op->addr, 8);
0115 }
0116
0117 static void do_encl_op_nop(void *_op)
0118 {
0119
0120 }
0121
0122 void encl_body(void *rdi,  void *rsi)
0123 {
0124     const void (*encl_op_array[ENCL_OP_MAX])(void *) = {
0125         do_encl_op_put_to_buf,
0126         do_encl_op_get_from_buf,
0127         do_encl_op_put_to_addr,
0128         do_encl_op_get_from_addr,
0129         do_encl_op_nop,
0130         do_encl_eaccept,
0131         do_encl_emodpe,
0132         do_encl_init_tcs_page,
0133     };
0134
0135     struct encl_op_header *op = (struct encl_op_header *)rdi;
0136
0137     if (op->type < ENCL_OP_MAX)
0138         (*encl_op_array[op->type])(op);
0139 }