1  /*
       2   * Copyright (c) 2019-2021 Dmitry V. Levin <ldv@strace.io>
       3   * All rights reserved.
       4   *
       5   * SPDX-License-Identifier: LGPL-2.1-or-later
       6   */
       7  
       8  #include "defs.h"
       9  #include <linux/fcntl.h>
      10  #include <linux/mount.h>
      11  #include "xlat/mount_setattr_flags.h"
      12  #include "xlat/mount_attr_attr.h"
      13  #include "xlat/mount_attr_propagation.h"
      14  
      15  static void
      16  print_mount_attr(struct tcb *const tcp,
      17  		 const kernel_ulong_t addr,
      18  		 const kernel_ulong_t size)
      19  {
      20  	struct mount_attr attr;
      21  
      22  	if (size < MOUNT_ATTR_SIZE_VER0) {
      23  		printaddr(addr);
      24  		return;
      25  	}
      26  
      27  	if (umoven_or_printaddr(tcp, addr, MIN(sizeof(attr), size), &attr))
      28  		return;
      29  
      30  	tprint_struct_begin();
      31  
      32  	PRINT_FIELD_FLAGS(attr, attr_set, mount_attr_attr, "MOUNT_ATTR_???");
      33  	tprint_struct_next();
      34  
      35  	PRINT_FIELD_FLAGS(attr, attr_clr, mount_attr_attr, "MOUNT_ATTR_???");
      36  	tprint_struct_next();
      37  
      38  	PRINT_FIELD_XVAL(attr, propagation, mount_attr_propagation, "MS_???");
      39  	tprint_struct_next();
      40  
      41  	if (attr.userns_fd > INT_MAX ||
      42  	    !((attr.attr_set | attr.attr_clr) & MOUNT_ATTR_IDMAP)) {
      43  		PRINT_FIELD_U(attr, userns_fd);
      44  	} else {
      45  		PRINT_FIELD_FD(attr, userns_fd, tcp);
      46  	}
      47  
      48  	if (size > sizeof(attr)) {
      49  		print_nonzero_bytes(tcp, tprint_struct_next, addr, sizeof(attr),
      50  				    MIN(size, get_pagesize()), QUOTE_FORCE_HEX);
      51  	}
      52  
      53  	tprint_struct_end();
      54  }
      55  
      56  SYS_FUNC(mount_setattr)
      57  {
      58  	/* dirfd */
      59  	print_dirfd(tcp, tcp->u_arg[0]);
      60  	tprint_arg_next();
      61  
      62  	/* pathname */
      63  	printpath(tcp, tcp->u_arg[1]);
      64  	tprint_arg_next();
      65  
      66  	/* flags */
      67  	printflags(mount_setattr_flags, tcp->u_arg[2], "AT_???");
      68  	tprint_arg_next();
      69  
      70  	/* uattr */
      71  	print_mount_attr(tcp, tcp->u_arg[3], tcp->u_arg[4]);
      72  	tprint_arg_next();
      73  
      74  	/* usize */
      75  	PRINT_VAL_U(tcp->u_arg[4]);
      76  
      77  	return RVAL_DECODED | RVAL_FD;
      78  }