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

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (C) 2019 ARM Limited
   4 *
   5 * Place a fake sigframe on the stack including a badly sized terminator
   6 * record: on sigreturn Kernel must spot this attempt and the test case
   7 * is expected to be 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_bad_size_for_magic0_run(struct tdescr *td,
  19                                                  siginfo_t *si, ucontext_t *uc)
  20{
  21        struct _aarch64_ctx *shead = GET_SF_RESV_HEAD(sf), *head;
  22
  23        /* just to fill the ucontext_t with something real */
  24        if (!get_current_context(td, &sf.uc))
  25                return 1;
  26
  27        /* at least HDR_SZ for the badly sized terminator. */
  28        head = get_starting_head(shead, HDR_SZ, GET_SF_RESV_SIZE(sf), NULL);
  29        if (!head)
  30                return 0;
  31
  32        head->magic = 0;
  33        head->size = HDR_SZ;
  34        ASSERT_BAD_CONTEXT(&sf.uc);
  35        fake_sigreturn(&sf, sizeof(sf), 0);
  36
  37        return 1;
  38}
  39
  40struct tdescr tde = {
  41                .name = "FAKE_SIGRETURN_BAD_SIZE_FOR_TERMINATOR",
  42                .descr = "Trigger a sigreturn using non-zero size terminator",
  43                .sig_ok = SIGSEGV,
  44                .timeout = 3,
  45                .run = fake_sigreturn_bad_size_for_magic0_run,
  46};
  47