elf/tst-env-setuid-tunables.c

   1 /* Copyright (C) 2017-2019 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    <https://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 /* This is compiled as part of the testsuite but needs to see
  23    HAVE_TUNABLES. */
  24 #define _LIBC 1
  25 #include "config.h"
  26 #undef _LIBC
  27
  28 #define test_parent test_parent_tunables
  29 #define test_child test_child_tunables
  30
  31 static int test_child_tunables (void);
  32 static int test_parent_tunables (void);
  33
  34 #include "tst-env-setuid.c"
  35
  36 #define CHILD_VALSTRING_VALUE "glibc.malloc.mmap_threshold=4096"
  37 #define PARENT_VALSTRING_VALUE \
  38   "glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096"
  39
  40 static int
  41 test_child_tunables (void)
  42 {
  43   const char *val = getenv ("GLIBC_TUNABLES");
  44
  45 #if HAVE_TUNABLES
  46   if (val != NULL && strcmp (val, CHILD_VALSTRING_VALUE) == 0)
  47     return 0;
  48
  49   if (val != NULL)
  50     printf ("Unexpected GLIBC_TUNABLES VALUE %s\n", val);
  51
  52   return 1;
  53 #else
  54   if (val != NULL)
  55     {
  56       printf ("GLIBC_TUNABLES not cleared\n");
  57       return 1;
  58     }
  59   return 0;
  60 #endif
  61 }
  62
  63 static int
  64 test_parent_tunables (void)
  65 {
  66   const char *val = getenv ("GLIBC_TUNABLES");
  67
  68   if (val != NULL && strcmp (val, PARENT_VALSTRING_VALUE) == 0)
  69     return 0;
  70
  71   if (val != NULL)
  72     printf ("Unexpected GLIBC_TUNABLES VALUE %s\n", val);
  73
  74   return 1;
  75 }