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

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (C) 2019 ARM Limited
   4 *
   5 * Place a fake sigframe on the stack including an additional FPSIMD
   6 * record: on sigreturn Kernel must spot this attempt and the test
   7 * case 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_duplicated_fpsimd_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        head = get_starting_head(shead, sizeof(struct fpsimd_context) + HDR_SZ,
  28                                 GET_SF_RESV_SIZE(sf), NULL);
  29        if (!head)
  30                return 0;
  31
  32        /* Add a spurious fpsimd_context */
  33        head->magic = FPSIMD_MAGIC;
  34        head->size = sizeof(struct fpsimd_context);
  35        /* and terminate */
  36        write_terminator_record(GET_RESV_NEXT_HEAD(head));
  37
  38        ASSERT_BAD_CONTEXT(&sf.uc);
  39        fake_sigreturn(&sf, sizeof(sf), 0);
  40
  41        return 1;
  42}
  43
  44struct tdescr tde = {
  45                .name = "FAKE_SIGRETURN_DUPLICATED_FPSIMD",
  46                .descr = "Triggers a sigreturn including two fpsimd_context",
  47                .sig_ok = SIGSEGV,
  48                .timeout = 3,
  49                .run = fake_sigreturn_duplicated_fpsimd_run,
  50};
  51