LXR linux/tools/testing/selftests/arm64/signal/testcases/mangle_pstate_invalid_compat

   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};
  32