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, mangling the
6  * DAIF bits in an illegal manner: this attempt must be spotted by Kernel
7  * and the test case is expected to be terminated via SEGV.
8  *
9  */
10 
11 #include "test_signals_utils.h"
12 #include "testcases.h"
13 
mangle_invalid_pstate_run(struct tdescr * td,siginfo_t * si,ucontext_t * uc)14 static int mangle_invalid_pstate_run(struct tdescr *td, siginfo_t *si,
15 				     ucontext_t *uc)
16 {
17 	ASSERT_GOOD_CONTEXT(uc);
18 
19 	/*
20 	 * This config should trigger a SIGSEGV by Kernel when it checks
21 	 * the sigframe consistency in valid_user_regs() routine.
22 	 */
23 	uc->uc_mcontext.pstate |= PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT;
24 
25 	return 1;
26 }
27 
28 struct tdescr tde = {
29 		.sanity_disabled = true,
30 		.name = "MANGLE_PSTATE_INVALID_DAIF_BITS",
31 		.descr = "Mangling uc_mcontext with INVALID DAIF_BITS",
32 		.sig_trig = SIGUSR1,
33 		.sig_ok = SIGSEGV,
34 		.run = mangle_invalid_pstate_run,
35 };
36