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

   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