tests/no_syscall_test.c

   1 // SPDX-License-Identifier: MIT
   2 // SPDX-FileCopyrightText: 2024 Michael Jeanson <mjeanson@efficios.com>
   3
   4 #ifndef _GNU_SOURCE
   5 #define _GNU_SOURCE
   6 #endif
   7 #include <stdint.h>
   8
   9 #include <rseq/rseq.h>
  10
  11 #include "tap.h"
  12
  13 #define NR_TESTS 5
  14
  15 /*
  16  * Check the state of the public symbols when the rseq syscall is unavailable.
  17  *
  18  * This test must be used with an LD_PRELOAD library to deny access to the
  19  * syscall, or on a kernel that doesn't implement the syscall.
  20  */
  21
  22 int main(void)
  23 {
  24         struct rseq_abi *rseq_abi;
  25
  26         plan_tests(NR_TESTS);
  27
  28         if (rseq_available(RSEQ_AVAILABLE_QUERY_KERNEL)) {
  29                 fail("The rseq syscall should be unavailable");
  30                 goto end;
  31         }
  32
  33         /* The rseq syscall is disabled, no registration is possible. */
  34
  35         ok(rseq_flags == 0, "rseq_flags prior to registration is 0 (%d)", rseq_flags);
  36         ok(rseq_size == 0, "rseq_size prior to registration is 0 (%d)", rseq_size);
  37         ok(rseq_feature_size == 0, "rseq_feature_size prior to registration is 0 (%d)", rseq_feature_size);
  38         ok(rseq_offset != 0, "rseq_offset prior to registration is not 0 (%td)", rseq_offset);
  39
  40         rseq_abi = rseq_get_abi();
  41         ok((int32_t) rseq_abi->cpu_id == RSEQ_ABI_CPU_ID_UNINITIALIZED,
  42                         "rseq->cpu_id is set to RSEQ_ABI_CPU_ID_UNINITIALIZED (%d)",
  43                         (int32_t) rseq_abi->cpu_id);
  44
  45 end:
  46         exit(exit_status());
  47 }