1  /*
       2   * Check decoding of prctl PR_GET_DUMPABLE/PR_SET_DUMPABLE operations.
       3   *
       4   * Copyright (c) 2016 Eugene Syromyatnikov <evgsyr@gmail.com>
       5   * Copyright (c) 2016 Dmitry V. Levin <ldv@strace.io>
       6   * Copyright (c) 2016-2021 The strace developers.
       7   * All rights reserved.
       8   *
       9   * SPDX-License-Identifier: GPL-2.0-or-later
      10   */
      11  
      12  #include "tests.h"
      13  #include "scno.h"
      14  #include <linux/prctl.h>
      15  
      16  #if !defined __ia64__
      17  
      18  # include <stdio.h>
      19  # include <unistd.h>
      20  
      21  static const char *errstr;
      22  
      23  static long
      24  prctl(kernel_ulong_t arg1, kernel_ulong_t arg2)
      25  {
      26  	static const kernel_ulong_t bogus_arg =
      27  		(kernel_ulong_t) 0xdeadbeefbadc0dedULL;
      28  	long rc = syscall(__NR_prctl, arg1, arg2, bogus_arg);
      29  	errstr = sprintrc(rc);
      30  	return rc;
      31  }
      32  
      33  int
      34  main(void)
      35  {
      36  	static const kernel_ulong_t bogus_dumpable1 =
      37  		(kernel_ulong_t) 0xdeadc0de00000001ULL;
      38  	static const kernel_ulong_t bogus_dumpable2 =
      39  		(kernel_ulong_t) 0xdeadc0defacebeefULL;
      40  
      41  	static const char * const args[] = {
      42  		"SUID_DUMP_DISABLE",
      43  		"SUID_DUMP_USER",
      44  		"SUID_DUMP_ROOT",
      45  	};
      46  
      47  	prctl_marker();
      48  
      49  	prctl(PR_SET_DUMPABLE, 3);
      50  	printf("prctl(PR_SET_DUMPABLE, 0x3 /* SUID_DUMP_??? */) = %s\n",
      51  	       errstr);
      52  
      53  	prctl(PR_SET_DUMPABLE, bogus_dumpable1);
      54  	if (bogus_dumpable1 == 1) {
      55  		printf("prctl(PR_SET_DUMPABLE, SUID_DUMP_USER) = %s\n", errstr);
      56  	} else {
      57  		printf("prctl(PR_SET_DUMPABLE, %#llx /* SUID_DUMP_??? */)"
      58  		       " = %s\n",
      59  		       (unsigned long long) bogus_dumpable1, errstr);
      60  	}
      61  
      62  	prctl(PR_SET_DUMPABLE, bogus_dumpable2);
      63  	printf("prctl(PR_SET_DUMPABLE, %#llx /* SUID_DUMP_??? */) = %s\n",
      64  	       (unsigned long long) bogus_dumpable2, errstr);
      65  
      66  	for (unsigned int i = 0; i < ARRAY_SIZE(args); ++i) {
      67  		prctl(PR_SET_DUMPABLE, i);
      68  		printf("prctl(PR_SET_DUMPABLE, %s) = %s\n", args[i], errstr);
      69  
      70  		long rc = prctl(PR_GET_DUMPABLE, bogus_dumpable2);
      71  		if (rc >= 0 && rc < (long) ARRAY_SIZE(args)) {
      72  			printf("prctl(PR_GET_DUMPABLE) = %s (%s)\n",
      73  			       errstr, args[rc]);
      74  		} else {
      75  			printf("prctl(PR_GET_DUMPABLE) = %s\n", errstr);
      76  		}
      77  	}
      78  
      79  	puts("+++ exited with 0 +++");
      80  	return 0;
      81  }
      82  
      83  #else
      84  
      85  SKIP_MAIN_UNDEFINED("!__ia64__")
      86  
      87  #endif