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/*
* Check decoding of PR_SET_SPECULATION_CTRL and PR_GET_SPECULATION_CTRL
* prctl operations.
*
* Copyright (c) 2018-2021 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "scno.h"
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <linux/prctl.h>
static long injected_val;
static long
do_prctl(kernel_ulong_t cmd, kernel_ulong_t arg2, kernel_ulong_t arg3)
{
long rc = syscall(__NR_prctl, cmd, arg2, arg3);
if (rc != injected_val)
error_msg_and_fail("Return value (%ld) differs from expected "
"injected value (%ld)",
rc, injected_val);
return rc;
}
int
main(int argc, char **argv)
{
static const kernel_ulong_t bogus_arg2 =
(kernel_ulong_t) 0xdeadfacebadc0dedULL;
static const kernel_ulong_t bogus_arg3 =
(kernel_ulong_t) 0xdecafeedbeefda7eULL;
static const struct {
long arg;
const char *str;
} spec_strs[] = {
{ 0, "PR_SPEC_STORE_BYPASS" },
{ 1, "PR_SPEC_INDIRECT_BRANCH" },
{ 2, "PR_SPEC_L1D_FLUSH" },
};
static const struct {
long arg;
const char *str;
} get_strs[] = {
{ -1, "" },
{ 0, " (PR_SPEC_NOT_AFFECTED)" },
{ 1, " (PR_SPEC_PRCTL)" },
{ 3, " (PR_SPEC_PRCTL|PR_SPEC_ENABLE)" },
{ 8, " (PR_SPEC_FORCE_DISABLE)" },
{ 16, " (PR_SPEC_DISABLE_NOEXEC)" },
{ 32, "" },
{ 42, " (PR_SPEC_ENABLE|PR_SPEC_FORCE_DISABLE|0x20)" },
};
static const struct {
kernel_ulong_t arg;
const char *str;
} set_strs[] = {
{ 0, "0 /* PR_SPEC_??? */" },
{ 1, "0x1 /* PR_SPEC_??? */" },
{ 2, "PR_SPEC_ENABLE" },
{ 3, "0x3 /* PR_SPEC_??? */" },
{ 8, "PR_SPEC_FORCE_DISABLE" },
{ 16, "PR_SPEC_DISABLE_NOEXEC" },
{ 32, "0x20 /* PR_SPEC_??? */" },
{ (kernel_ulong_t) 0xdecafeedbeefda7eULL, "0x"
#if SIZEOF_KERNEL_LONG_T == 8
"decafeed"
#endif
"beefda7e /* PR_SPEC_??? */" },
};
long rc;
unsigned long num_skip;
const char *str = NULL;
bool locked = false;
if (argc < 3)
error_msg_and_fail("Usage: %s NUM_SKIP INJECT_RETVAL", argv[0]);
num_skip = strtoul(argv[1], NULL, 0);
injected_val = strtol(argv[2], NULL, 0);
for (size_t i = 0; i < num_skip; i++) {
if ((prctl_marker() != injected_val) ||
((injected_val == -1) && (errno != ENOTTY)))
continue;
locked = true;
break;
}
if (!locked)
error_msg_and_fail("Have not locked on prctl(-1, -2, -3, -4"
", -5) returning %ld", injected_val);
/* PR_GET_SPECULATION_CTRL */
rc = do_prctl(52, 3, bogus_arg3);
printf("prctl(PR_GET_SPECULATION_CTRL, 0x3 /* PR_SPEC_??? */) "
"= %s (INJECTED)\n", sprintrc(rc));
rc = do_prctl(52, bogus_arg2, bogus_arg3);
printf("prctl(PR_GET_SPECULATION_CTRL, %#llx /* PR_SPEC_??? */) "
"= %s (INJECTED)\n",
(unsigned long long) bogus_arg2, sprintrc(rc));
for (unsigned c = 0; c < ARRAY_SIZE(spec_strs); c++) {
rc = do_prctl(52, spec_strs[c].arg, bogus_arg3);
for (unsigned i = 0; i < ARRAY_SIZE(get_strs); i++) {
if (get_strs[i].arg == rc) {
str = get_strs[i].str;
break;
}
}
if (!str)
error_msg_and_fail("Unknown return value: %ld", rc);
if (rc < 0) {
printf("prctl(PR_GET_SPECULATION_CTRL, %s) = %s%s"
" (INJECTED)\n",
spec_strs[c].str, sprintrc(rc), str);
} else {
printf("prctl(PR_GET_SPECULATION_CTRL, %s) = %#lx%s"
" (INJECTED)\n",
spec_strs[c].str, rc, str);
}
}
/* PR_SET_SPECULATION_CTRL*/
rc = do_prctl(53, 3, bogus_arg3);
printf("prctl(PR_SET_SPECULATION_CTRL, 0x3 /* PR_SPEC_??? */, %#llx) "
"= %s (INJECTED)\n",
(unsigned long long) bogus_arg3, sprintrc(rc));
rc = do_prctl(53, bogus_arg2, bogus_arg3);
printf("prctl(PR_SET_SPECULATION_CTRL, %#llx /* PR_SPEC_??? */, %#llx) "
"= %s (INJECTED)\n",
(unsigned long long) bogus_arg2,
(unsigned long long) bogus_arg3,
sprintrc(rc));
for (unsigned c = 0; c < ARRAY_SIZE(spec_strs); c++) {
for (unsigned i = 0; i < ARRAY_SIZE(set_strs); i++) {
rc = do_prctl(53, spec_strs[c].arg, set_strs[i].arg);
printf("prctl(PR_SET_SPECULATION_CTRL, %s"
", %s) = %s (INJECTED)\n",
spec_strs[c].str, set_strs[i].str, sprintrc(rc));
}
}
puts("+++ exited with 0 +++");
return 0;
}
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