granicus.if.org Git - strace/blob - random_ioctl.c

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