1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2019 ARM Limited
4  *
5  * Try to mangle the ucontext from inside a signal handler, toggling
6  * the execution state bit: this attempt must be spotted by Kernel and
7  * the test case is expected to be terminated via SEGV.
8  */
9 
10 #include "test_signals_utils.h"
11 #include "testcases.h"
12 
13 static int mangle_invalid_pstate_run(struct tdescr *td, siginfo_t *si,
14 				     ucontext_t *uc)
15 {
16 	ASSERT_GOOD_CONTEXT(uc);
17 
18 	/* This config should trigger a SIGSEGV by Kernel */
19 	uc->uc_mcontext.pstate ^= PSR_MODE32_BIT;
20 
21 	return 1;
22 }
23 
24 struct tdescr tde = {
25 		.sanity_disabled = true,
26 		.name = "MANGLE_PSTATE_INVALID_STATE_TOGGLE",
27 		.descr = "Mangling uc_mcontext with INVALID STATE_TOGGLE",
28 		.sig_trig = SIGUSR1,
29 		.sig_ok = SIGSEGV,
30 		.run = mangle_invalid_pstate_run,
31 };
32