glibc/elf/dl-tunables.list

# Copyright (C) 2016 Free Software Foundation, Inc.
# This file is part of the GNU C Library.

# The GNU C Library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.

# The GNU C Library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.

# You should have received a copy of the GNU Lesser General Public
# License along with the GNU C Library; if not, see
# <http://www.gnu.org/licenses/>.

# Allowed attributes for tunables:
#
# type: Defaults to STRING
# minval: Optional minimum acceptable value
# maxval: Optional maximum acceptable value
# env_alias: An alias environment variable
# is_secure: Specify whether the environment variable should be read for
# setuid binaries.

glibc {
  malloc {
    check {
      type: INT_32
      minval: 0
      maxval: 3
      env_alias: MALLOC_CHECK_
      is_secure: true
    }
    top_pad {
      type: SIZE_T
      env_alias: MALLOC_TOP_PAD_
    }
    perturb {
      type: INT_32
      minval: 0
      maxval: 0xff
      env_alias: MALLOC_PERTURB_
    }
    mmap_threshold {
      type: SIZE_T
      env_alias: MALLOC_MMAP_THRESHOLD_
    }
    trim_threshold {
      type: SIZE_T
      env_alias: MALLOC_TRIM_THRESHOLD_
    }
    mmap_max {
      type: INT_32
      env_alias: MALLOC_MMAP_MAX_
    }
    arena_max {
      type: SIZE_T
      env_alias: MALLOC_ARENA_MAX
      minval: 1
    }
    arena_test {
      type: SIZE_T
      env_alias: MALLOC_ARENA_TEST
      minval: 1
    }
  }
}