# Copyright (C) 2016-2017 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 # security_level: Specify security level of the tunable. Valid values are: # # SXID_ERASE: (default) Don't read for AT_SECURE binaries and # removed so that child processes can't read it. # SXID_IGNORE: Don't read for AT_SECURE binaries, but retained for # non-AT_SECURE subprocesses. # NONE: Read all the time. glibc { malloc { check { type: INT_32 minval: 0 maxval: 3 env_alias: MALLOC_CHECK_ } top_pad { type: SIZE_T env_alias: MALLOC_TOP_PAD_ security_level: SXID_IGNORE } perturb { type: INT_32 minval: 0 maxval: 0xff env_alias: MALLOC_PERTURB_ security_level: SXID_IGNORE } mmap_threshold { type: SIZE_T env_alias: MALLOC_MMAP_THRESHOLD_ security_level: SXID_IGNORE } trim_threshold { type: SIZE_T env_alias: MALLOC_TRIM_THRESHOLD_ security_level: SXID_IGNORE } mmap_max { type: INT_32 env_alias: MALLOC_MMAP_MAX_ security_level: SXID_IGNORE } arena_max { type: SIZE_T env_alias: MALLOC_ARENA_MAX minval: 1 security_level: SXID_IGNORE } arena_test { type: SIZE_T env_alias: MALLOC_ARENA_TEST minval: 1 security_level: SXID_IGNORE } tcache_max { type: SIZE_T security_level: SXID_ERASE } tcache_count { type: SIZE_T security_level: SXID_ERASE } tcache_unsorted_limit { type: SIZE_T security_level: SXID_ERASE } } tune { hwcap_mask { type: UINT_64 env_alias: LD_HWCAP_MASK default: HWCAP_IMPORTANT } } }