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
14static 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
28struct 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