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// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2016-20 Intel Corporation. */
#include <elf.h>
#include <errno.h>
#include <fcntl.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include "defines.h"
#include "main.h"
#include "../kselftest.h"
static const uint64_t MAGIC = 0x1122334455667788ULL;
vdso_sgx_enter_enclave_t eenter;
struct vdso_symtab {
Elf64_Sym *elf_symtab;
const char *elf_symstrtab;
Elf64_Word *elf_hashtab;
};
static void *vdso_get_base_addr(char *envp[])
{
Elf64_auxv_t *auxv;
int i;
for (i = 0; envp[i]; i++)
;
auxv = (Elf64_auxv_t *)&envp[i + 1];
for (i = 0; auxv[i].a_type != AT_NULL; i++) {
if (auxv[i].a_type == AT_SYSINFO_EHDR)
return (void *)auxv[i].a_un.a_val;
}
return NULL;
}
static Elf64_Dyn *vdso_get_dyntab(void *addr)
{
Elf64_Ehdr *ehdr = addr;
Elf64_Phdr *phdrtab = addr + ehdr->e_phoff;
int i;
for (i = 0; i < ehdr->e_phnum; i++)
if (phdrtab[i].p_type == PT_DYNAMIC)
return addr + phdrtab[i].p_offset;
return NULL;
}
static void *vdso_get_dyn(void *addr, Elf64_Dyn *dyntab, Elf64_Sxword tag)
{
int i;
for (i = 0; dyntab[i].d_tag != DT_NULL; i++)
if (dyntab[i].d_tag == tag)
return addr + dyntab[i].d_un.d_ptr;
return NULL;
}
static bool vdso_get_symtab(void *addr, struct vdso_symtab *symtab)
{
Elf64_Dyn *dyntab = vdso_get_dyntab(addr);
symtab->elf_symtab = vdso_get_dyn(addr, dyntab, DT_SYMTAB);
if (!symtab->elf_symtab)
return false;
symtab->elf_symstrtab = vdso_get_dyn(addr, dyntab, DT_STRTAB);
if (!symtab->elf_symstrtab)
return false;
symtab->elf_hashtab = vdso_get_dyn(addr, dyntab, DT_HASH);
if (!symtab->elf_hashtab)
return false;
return true;
}
static unsigned long elf_sym_hash(const char *name)
{
unsigned long h = 0, high;
while (*name) {
h = (h << 4) + *name++;
high = h & 0xf0000000;
if (high)
h ^= high >> 24;
h &= ~high;
}
return h;
}
static Elf64_Sym *vdso_symtab_get(struct vdso_symtab *symtab, const char *name)
{
Elf64_Word bucketnum = symtab->elf_hashtab[0];
Elf64_Word *buckettab = &symtab->elf_hashtab[2];
Elf64_Word *chaintab = &symtab->elf_hashtab[2 + bucketnum];
Elf64_Sym *sym;
Elf64_Word i;
for (i = buckettab[elf_sym_hash(name) % bucketnum]; i != STN_UNDEF;
i = chaintab[i]) {
sym = &symtab->elf_symtab[i];
if (!strcmp(name, &symtab->elf_symstrtab[sym->st_name]))
return sym;
}
return NULL;
}
bool report_results(struct sgx_enclave_run *run, int ret, uint64_t result,
const char *test)
{
bool valid = true;
if (ret) {
printf("FAIL: %s() returned: %d\n", test, ret);
valid = false;
}
if (run->function != EEXIT) {
printf("FAIL: %s() function, expected: %u, got: %u\n", test, EEXIT,
run->function);
valid = false;
}
if (result != MAGIC) {
printf("FAIL: %s(), expected: 0x%lx, got: 0x%lx\n", test, MAGIC,
result);
valid = false;
}
if (run->user_data) {
printf("FAIL: %s() user data, expected: 0x0, got: 0x%llx\n",
test, run->user_data);
valid = false;
}
return valid;
}
static int user_handler(long rdi, long rsi, long rdx, long ursp, long r8, long r9,
struct sgx_enclave_run *run)
{
run->user_data = 0;
return 0;
}
int main(int argc, char *argv[], char *envp[])
{
struct sgx_enclave_run run;
struct vdso_symtab symtab;
Elf64_Sym *eenter_sym;
uint64_t result = 0;
struct encl encl;
unsigned int i;
void *addr;
int ret;
memset(&run, 0, sizeof(run));
if (!encl_load("test_encl.elf", &encl)) {
encl_delete(&encl);
ksft_exit_skip("cannot load enclaves\n");
}
if (!encl_measure(&encl))
goto err;
if (!encl_build(&encl))
goto err;
/*
* An enclave consumer only must do this.
*/
for (i = 0; i < encl.nr_segments; i++) {
struct encl_segment *seg = &encl.segment_tbl[i];
addr = mmap((void *)encl.encl_base + seg->offset, seg->size,
seg->prot, MAP_SHARED | MAP_FIXED, encl.fd, 0);
if (addr == MAP_FAILED) {
fprintf(stderr, "mmap() failed, errno=%d.\n", errno);
exit(KSFT_FAIL);
}
}
memset(&run, 0, sizeof(run));
run.tcs = encl.encl_base;
addr = vdso_get_base_addr(envp);
if (!addr)
goto err;
if (!vdso_get_symtab(addr, &symtab))
goto err;
eenter_sym = vdso_symtab_get(&symtab, "__vdso_sgx_enter_enclave");
if (!eenter_sym)
goto err;
eenter = addr + eenter_sym->st_value;
ret = sgx_call_vdso((void *)&MAGIC, &result, 0, EENTER, NULL, NULL, &run);
if (!report_results(&run, ret, result, "sgx_call_vdso"))
goto err;
/* Invoke the vDSO directly. */
result = 0;
ret = eenter((unsigned long)&MAGIC, (unsigned long)&result, 0, EENTER,
0, 0, &run);
if (!report_results(&run, ret, result, "eenter"))
goto err;
/* And with an exit handler. */
run.user_handler = (__u64)user_handler;
run.user_data = 0xdeadbeef;
ret = eenter((unsigned long)&MAGIC, (unsigned long)&result, 0, EENTER,
0, 0, &run);
if (!report_results(&run, ret, result, "user_handler"))
goto err;
printf("SUCCESS\n");
encl_delete(&encl);
exit(KSFT_PASS);
err:
encl_delete(&encl);
exit(KSFT_FAIL);
}
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