1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2019 ARM Limited
4 *
5 * Place a fake sigframe on the stack at a misaligned SP: on sigreturn
6 * Kernel must spot this attempt and the test case is expected to be
7 * terminated via SEGV.
8 */
9
10#include <signal.h>
11#include <ucontext.h>
12
13#include "test_signals_utils.h"
14#include "testcases.h"
15
16struct fake_sigframe sf;
17
18static int fake_sigreturn_misaligned_run(struct tdescr *td,
19					 siginfo_t *si, ucontext_t *uc)
20{
21	/* just to fill the ucontext_t with something real */
22	if (!get_current_context(td, &sf.uc, sizeof(sf.uc)))
23		return 1;
24
25	/* Forcing sigframe on misaligned SP (16 + 3) */
26	fake_sigreturn(&sf, sizeof(sf), 3);
27
28	return 1;
29}
30
31struct tdescr tde = {
32		.name = "FAKE_SIGRETURN_MISALIGNED_SP",
33		.descr = "Triggers a sigreturn with a misaligned sigframe",
34		.sig_ok = SIGSEGV,
35		.timeout = 3,
36		.run = fake_sigreturn_misaligned_run,
37};
38