1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2019 ARM Limited
4 *
5 * Place a fake sigframe on the stack missing the mandatory FPSIMD
6 * record: on sigreturn Kernel must spot this attempt and the test
7 * case is expected to be terminated via SEGV.
8 */
9
10#include <stdio.h>
11#include <signal.h>
12#include <ucontext.h>
13
14#include "test_signals_utils.h"
15#include "testcases.h"
16
17struct fake_sigframe sf;
18
19static int fake_sigreturn_missing_fpsimd_run(struct tdescr *td,
20					     siginfo_t *si, ucontext_t *uc)
21{
22	size_t resv_sz, offset;
23	struct _aarch64_ctx *head = GET_SF_RESV_HEAD(sf);
24
25	/* just to fill the ucontext_t with something real */
26	if (!get_current_context(td, &sf.uc, sizeof(sf.uc)))
27		return 1;
28
29	resv_sz = GET_SF_RESV_SIZE(sf);
30	head = get_header(head, FPSIMD_MAGIC, resv_sz, &offset);
31	if (head && resv_sz - offset >= HDR_SZ) {
32		fprintf(stderr, "Mangling template header. Spare space:%zd\n",
33			resv_sz - offset);
34		/* Just overwrite fpsmid_context */
35		write_terminator_record(head);
36
37		ASSERT_BAD_CONTEXT(&sf.uc);
38		fake_sigreturn(&sf, sizeof(sf), 0);
39	}
40
41	return 1;
42}
43
44struct tdescr tde = {
45		.name = "FAKE_SIGRETURN_MISSING_FPSIMD",
46		.descr = "Triggers a sigreturn with a missing fpsimd_context",
47		.sig_ok = SIGSEGV,
48		.timeout = 3,
49		.run = fake_sigreturn_missing_fpsimd_run,
50};
51