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 BAD Unknown magic
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 <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_magic_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	/* need at least 2*HDR_SZ space: KSFT_BAD_MAGIC + terminator. */
28	head = get_starting_head(shead, HDR_SZ * 2, GET_SF_RESV_SIZE(sf), NULL);
29	if (!head)
30		return 0;
31
32	/*
33	 * use a well known NON existent bad magic...something
34	 * we should pretty sure won't be ever defined in Kernel
35	 */
36	head->magic = KSFT_BAD_MAGIC;
37	head->size = HDR_SZ;
38	write_terminator_record(GET_RESV_NEXT_HEAD(head));
39
40	ASSERT_BAD_CONTEXT(&sf.uc);
41	fake_sigreturn(&sf, sizeof(sf), 0);
42
43	return 1;
44}
45
46struct tdescr tde = {
47		.name = "FAKE_SIGRETURN_BAD_MAGIC",
48		.descr = "Trigger a sigreturn with a sigframe with a bad magic",
49		.sig_ok = SIGSEGV,
50		.timeout = 3,
51		.run = fake_sigreturn_bad_magic_run,
52};
53