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

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (C) 2019 ARM Limited
   4 *
   5 * Place a fake sigframe on the stack at a misaligned SP: on sigreturn
   6 * Kernel must spot this attempt and the test case is expected to be
   7 * terminated via SEGV.
   8 */
   9
  10#include <signal.h>
  11#include <ucontext.h>
  12
  13#include "test_signals_utils.h"
  14#include "testcases.h"
  15
  16struct fake_sigframe sf;
  17
  18static int fake_sigreturn_misaligned_run(struct tdescr *td,
  19                                         siginfo_t *si, ucontext_t *uc)
  20{
  21        /* just to fill the ucontext_t with something real */
  22        if (!get_current_context(td, &sf.uc))
  23                return 1;
  24
  25        /* Forcing sigframe on misaligned SP (16 + 3) */
  26        fake_sigreturn(&sf, sizeof(sf), 3);
  27
  28        return 1;
  29}
  30
  31struct tdescr tde = {
  32                .name = "FAKE_SIGRETURN_MISALIGNED_SP",
  33                .descr = "Triggers a sigreturn with a misaligned sigframe",
  34                .sig_ok = SIGSEGV,
  35                .timeout = 3,
  36                .run = fake_sigreturn_misaligned_run,
  37};
  38