elf/tst-env-setuid-tunables.c

   1 /* Copyright (C) 2017 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 /* Verify that tunables correctly filter out unsafe tunables like
  19    glibc.malloc.check and glibc.malloc.mmap_threshold but also retain
  20    glibc.malloc.mmap_threshold in an unprivileged child.  */
  21
  22 #define test_parent test_parent_tunables
  23 #define test_child test_child_tunables
  24
  25 static int test_child_tunables (void);
  26 static int test_parent_tunables (void);
  27
  28 #include "tst-env-setuid.c"
  29
  30 #define CHILD_VALSTRING_VALUE "glibc.malloc.mmap_threshold=4096"
  31 #define PARENT_VALSTRING_VALUE \
  32   "glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096"
  33
  34 static int
  35 test_child_tunables (void)
  36 {
  37   const char *val = getenv ("GLIBC_TUNABLES");
  38
  39 #if HAVE_TUNABLES
  40   if (val != NULL && strcmp (val, CHILD_VALSTRING_VALUE) == 0)
  41     return 0;
  42
  43   if (val != NULL)
  44     printf ("Unexpected GLIBC_TUNABLES VALUE %s\n", val);
  45
  46   return 1;
  47 #else
  48   if (val != NULL)
  49     {
  50       printf ("GLIBC_TUNABLES not cleared\n");
  51       return 1;
  52     }
  53   return 0;
  54 #endif
  55 }
  56
  57 static int
  58 test_parent_tunables (void)
  59 {
  60   const char *val = getenv ("GLIBC_TUNABLES");
  61
  62   if (val != NULL && strcmp (val, PARENT_VALSTRING_VALUE) == 0)
  63     return 0;
  64
  65   if (val != NULL)
  66     printf ("Unexpected GLIBC_TUNABLES VALUE %s\n", val);
  67
  68   return 1;
  69 }