1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2019 ARM Limited
4 *
5 * Place a fake sigframe on the stack including a badly sized terminator
6 * record: on sigreturn Kernel must spot this attempt and the test case
7 * is expected to be 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_bad_size_for_magic0_run(struct tdescr *td,
19						  siginfo_t *si, ucontext_t *uc)
20{
21	struct _aarch64_ctx *shead = GET_SF_RESV_HEAD(sf), *head;
22
23	/* just to fill the ucontext_t with something real */
24	if (!get_current_context(td, &sf.uc, sizeof(sf.uc)))
25		return 1;
26
27	/* at least HDR_SZ for the badly sized terminator. */
28	head = get_starting_head(shead, HDR_SZ, GET_SF_RESV_SIZE(sf), NULL);
29	if (!head)
30		return 0;
31
32	head->magic = 0;
33	head->size = HDR_SZ;
34	ASSERT_BAD_CONTEXT(&sf.uc);
35	fake_sigreturn(&sf, sizeof(sf), 0);
36
37	return 1;
38}
39
40struct tdescr tde = {
41		.name = "FAKE_SIGRETURN_BAD_SIZE_FOR_TERMINATOR",
42		.descr = "Trigger a sigreturn using non-zero size terminator",
43		.sig_ok = SIGSEGV,
44		.timeout = 3,
45		.run = fake_sigreturn_bad_size_for_magic0_run,
46};
47