mangle_pstate_invalid_compat_toggle.c

 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
13static 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
24struct 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};