1  /*
       2   * Check decoding of prctl PR_SET_VMA operation.
       3   *
       4   * Copyright (c) 2019-2022 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  #include <stdio.h>
      13  #include <unistd.h>
      14  #include <linux/prctl.h>
      15  
      16  static const kernel_ulong_t fill = (kernel_ulong_t) 0xdefaced00000000ULL;
      17  static const char *errstr;
      18  
      19  static long
      20  pr_set_vma(const kernel_ulong_t op, const void *const addr,
      21  	   const kernel_ulong_t size, const void *const arg)
      22  {
      23  	const kernel_ulong_t bad = (kernel_ulong_t) 0xbadc0dedbadc0dedULL;
      24  	const kernel_ulong_t arg1 = fill | PR_SET_VMA;
      25  	const kernel_ulong_t arg2 = op;
      26  	const kernel_ulong_t arg3 = (uintptr_t) addr;
      27  	const kernel_ulong_t arg4 = size;
      28  	const kernel_ulong_t arg5 = (uintptr_t) arg;
      29  	const long rc = syscall(__NR_prctl, arg1, arg2, arg3, arg4, arg5, bad);
      30  	errstr = sprintrc(rc);
      31  	return rc;
      32  }
      33  
      34  int
      35  main(void)
      36  {
      37  	prctl_marker();
      38  
      39  	char *const name1 = tail_alloc(DEFAULT_STRLEN + 2);
      40  	char *const name = name1 + 1;
      41  	const void *const efault = name + DEFAULT_STRLEN + 1;
      42  	const char *const empty = efault - 1;
      43  	fill_memory_ex(name1, DEFAULT_STRLEN + 1, '0', 10);
      44  	name1[DEFAULT_STRLEN + 1] = '\0';
      45  
      46  	pr_set_vma(0, 0, 1, name);
      47  	printf("prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, NULL, 1, \"%s\")"
      48  	       " = %s\n",
      49  	       name, errstr);
      50  
      51  	pr_set_vma(0, empty, 2, name1);
      52  	printf("prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, %p, 2, \"%.*s\"...)"
      53  	       " = %s\n",
      54  	       empty, DEFAULT_STRLEN, name1, errstr);
      55  
      56  	pr_set_vma(0, empty, 3, efault);
      57  	printf("prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, %p, 3, %p)"
      58  	       " = %s\n",
      59  	       empty, efault, errstr);
      60  
      61  	pr_set_vma(0, empty, 4, 0);
      62  	printf("prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, %p, 4, NULL)"
      63  	       " = %s\n",
      64  	       empty, errstr);
      65  
      66  	pr_set_vma(0, efault, 5, empty);
      67  	printf("prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, %p, 5, \"\")"
      68  	       " = %s\n",
      69  	       efault, errstr);
      70  
      71  	const kernel_ulong_t bad_op = fill | 0xface1fed;
      72  	const kernel_ulong_t bad_size = fill | 0xface2fed;
      73  
      74  	pr_set_vma(bad_op, efault, bad_size, empty);
      75  	printf("prctl(PR_SET_VMA, %#llx /* PR_SET_VMA_??? */, %p, %#llx, %p)"
      76  	       " = %s\n",
      77  	       (unsigned long long) bad_op, efault,
      78  	       (unsigned long long) bad_size, empty, errstr);
      79  
      80  	puts("+++ exited with 0 +++");
      81  	return 0;
      82  }