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 
16 struct fake_sigframe sf;
17 
18 static 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 
31 struct 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