Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2// Copyright (C) 2020 ARM Limited
3
4#include <stdio.h>
5#include <stdlib.h>
6#include <sys/auxv.h>
7
8#include "helper.h"
9
10int main(void)
11{
12 struct signatures signed_vals;
13 unsigned long hwcaps;
14 size_t val;
15
16 size_t size = fread(&val, sizeof(size_t), 1, stdin);
17
18 if (size != 1) {
19 fprintf(stderr, "Could not read input from stdin\n");
20 return EXIT_FAILURE;
21 }
22
23 /* don't try to execute illegal (unimplemented) instructions) caller
24 * should have checked this and keep worker simple
25 */
26 hwcaps = getauxval(AT_HWCAP);
27
28 if (hwcaps & HWCAP_PACA) {
29 signed_vals.keyia = keyia_sign(val);
30 signed_vals.keyib = keyib_sign(val);
31 signed_vals.keyda = keyda_sign(val);
32 signed_vals.keydb = keydb_sign(val);
33 }
34 signed_vals.keyg = (hwcaps & HWCAP_PACG) ? keyg_sign(val) : 0;
35
36 fwrite(&signed_vals, sizeof(struct signatures), 1, stdout);
37
38 return 0;
39}