granicus.if.org Git - strace/blob - tests/lookup_dcookie.c

   1 /*
   2  * Check decoding of lookup_dcookie syscall.
   3  *
   4  * Copyright (c) 2016 Eugene Syromyatnikov <evgsyr@gmail.com>
   5  * All rights reserved.
   6  *
   7  * SPDX-License-Identifier: GPL-2.0-or-later
   8  */
   9
  10 #include "tests.h"
  11
  12 #include <asm/unistd.h>
  13
  14 #ifdef __NR_lookup_dcookie
  15
  16 # include <inttypes.h>
  17 # include <limits.h>
  18 # include <stdio.h>
  19 # include <unistd.h>
  20
  21 static void
  22 do_lookup_cookie(uint64_t cookie, char *buf, kernel_ulong_t len)
  23 {
  24         long rc;
  25         const char *errstr;
  26
  27 # if (LONG_MAX > INT_MAX) \
  28   || (defined __x86_64__ && defined __ILP32__) \
  29   || defined LINUX_MIPSN32
  30         rc = syscall(__NR_lookup_dcookie, cookie, buf, len);
  31 # else
  32         rc = syscall(__NR_lookup_dcookie, LL_VAL_TO_PAIR(cookie), buf, len);
  33 # endif
  34
  35         errstr = sprintrc(rc);
  36         printf("lookup_dcookie(%" PRIu64 ", ", cookie);
  37
  38         /* Here, we trust successful return code */
  39         if ((rc >= 0) && (rc < (long) INT_MAX)) {
  40                 printf("%.*s, ", (int) rc, buf);
  41         } else {
  42                 if (buf != NULL)
  43                         printf("%p, ", buf);
  44                 else
  45                         printf("NULL, ");
  46         }
  47
  48         printf("%" PRIu64 ") = %s\n", (uint64_t) len, errstr);
  49 }
  50
  51 int
  52 main(void)
  53 {
  54         enum { BUF_SIZE = 4096 };
  55
  56         static const uint64_t bogus_cookie =
  57                 (uint64_t) 0xf157feeddeadfaceULL;
  58         static const kernel_ulong_t bogus_len =
  59                 (kernel_ulong_t) 0xbadc0dedda7a1057ULL;
  60
  61         char *buf = tail_alloc(BUF_SIZE);
  62
  63         do_lookup_cookie(0, NULL, 0);
  64         do_lookup_cookie(bogus_cookie, buf + BUF_SIZE, bogus_len);
  65         do_lookup_cookie(bogus_cookie, buf, BUF_SIZE);
  66
  67         puts("+++ exited with 0 +++");
  68
  69         return 0;
  70 }
  71
  72 #else
  73
  74 SKIP_MAIN_UNDEFINED("__NR_lookup_dcookie");
  75
  76 #endif