tools/testing/selftests/arm64/signal/testcases/fake_sigreturn_duplicated_fpsimd.c

   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
  16 struct fake_sigframe sf;
  17
  18 static 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
  44 struct 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 };