1  /*
       2   * Copyright (c) 2018-2021 The strace developers.
       3   * All rights reserved.
       4   *
       5   * SPDX-License-Identifier: LGPL-2.1-or-later
       6   */
       7  
       8  #include "defs.h"
       9  
      10  #include <linux/types.h>
      11  #include <linux/random.h>
      12  
      13  #define XLAT_MACROS_ONLY
      14  #include "xlat/random_ioctl_cmds.h"
      15  #undef XLAT_MACROS_ONLY
      16  
      17  /*
      18   * RNDGETPOOL was removed in 2.6.9, so non-ancient kernels always
      19   * return -EINVAL for that.
      20   */
      21  
      22  int
      23  random_ioctl(struct tcb *const tcp, const unsigned int code,
      24  	   const kernel_ulong_t arg)
      25  {
      26  	struct rand_pool_info info;
      27  	kernel_ulong_t buf;
      28  
      29  	switch (code) {
      30  	case RNDGETENTCNT:
      31  		if (entering(tcp))
      32  			return 0;
      33  		ATTRIBUTE_FALLTHROUGH;
      34  	case RNDADDTOENTCNT:
      35  		tprint_arg_next();
      36  		printnum_int(tcp, arg, "%d");
      37  		break;
      38  
      39  	case RNDADDENTROPY:
      40  		tprint_arg_next();
      41  		if (!umove_or_printaddr(tcp, arg, &info)) {
      42  			tprint_struct_begin();
      43  			PRINT_FIELD_D(info, entropy_count);
      44  			tprint_struct_next();
      45  			PRINT_FIELD_D(info, buf_size);
      46  			tprint_struct_next();
      47  			tprints_field_name("buf");
      48  			buf = arg + offsetof(struct rand_pool_info, buf);
      49  			printstrn(tcp, buf, info.buf_size);
      50  			tprint_struct_end();
      51  		}
      52  		break;
      53  
      54  	/* ioctls with no parameters */
      55  	case RNDZAPENTCNT:
      56  	case RNDCLEARPOOL:
      57  	case RNDRESEEDCRNG:
      58  		break;
      59  	default:
      60  		return RVAL_DECODED;
      61  	}
      62  	return RVAL_IOCTL_DECODED;
      63  }