1  /*
       2   * Check decoding of sysctl syscall.
       3   *
       4   * Copyright (c) 2022 Dmitry V. Levin <ldv@strace.io>
       5   * All rights reserved.
       6   *
       7   * SPDX-License-Identifier: GPL-2.0-or-later
       8   */
       9  
      10  #include "tests.h"
      11  #include "scno.h"
      12  
      13  #ifdef __NR__sysctl
      14  
      15  # include <stdio.h>
      16  # include <string.h>
      17  # include <unistd.h>
      18  # include <linux/sysctl.h>
      19  
      20  static const char *errstr;
      21  
      22  static long
      23  k_sysctl(const void *const args)
      24  {
      25  	const kernel_ulong_t bad = (kernel_ulong_t) 0xbadc0dedbadc0dedULL;
      26  	const long rc = syscall(__NR__sysctl, (uintptr_t) args,
      27  				bad, bad, bad, bad, bad);
      28  	errstr = sprintrc(rc);
      29  	return rc;
      30  }
      31  
      32  int
      33  main(void)
      34  {
      35  	TAIL_ALLOC_OBJECT_CONST_PTR(struct __sysctl_args, args);
      36  	void *const efault = args + 1;
      37  
      38  	k_sysctl(efault);
      39  	printf("_sysctl(%p) = %s\n", efault, errstr);
      40  
      41  	memset(args, 0, sizeof(*args));
      42  	k_sysctl(args);
      43  	printf("_sysctl({name=NULL, nlen=0, oldval=NULL, oldlenp=NULL"
      44  	       ", newval=NULL, newlen=0}) = %s\n", errstr);
      45  
      46  	fill_memory_ex(args, sizeof(*args), 'a', 'z' - 'a' + 1);
      47  	args->name = efault;
      48  
      49  	k_sysctl(args);
      50  	printf("_sysctl({name=%p, nlen=%d, oldval=%p, oldlenp=%p"
      51  	       ", newval=%p, newlen=%llu}) = %s\n",
      52  	       args->name, args->nlen, args->oldval, args->oldlenp,
      53  	       args->newval, (unsigned long long) args->newlen, errstr);
      54  
      55  	puts("+++ exited with 0 +++");
      56  	return 0;
      57  }
      58  
      59  #else
      60  
      61  SKIP_MAIN_UNDEFINED("__NR__sysctl")
      62  
      63  #endif