mirror of
https://sourceware.org/git/glibc.git
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411 lines
8.7 KiB
C
411 lines
8.7 KiB
C
/* Check GLIBC_TUNABLES parsing.
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Copyright (C) 2023-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <array_length.h>
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/* The test uses the tunable_list size, which is only exported for
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ld.so. This will result in a copy of tunable_list, which is ununsed by
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the test itself. */
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#define TUNABLES_INTERNAL 1
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#include <dl-tunables.h>
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#include <getopt.h>
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#include <intprops.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <support/capture_subprocess.h>
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#include <support/check.h>
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#include <support/support.h>
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static int restart;
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#define CMDLINE_OPTIONS \
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{ "restart", no_argument, &restart, 1 },
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static struct test_t
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{
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const char *name;
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const char *value;
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int32_t expected_malloc_check;
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size_t expected_mmap_threshold;
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int32_t expected_perturb;
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} tests[] =
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{
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/* Expected tunable format. */
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{
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"GLIBC_TUNABLES",
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"glibc.malloc.check=2",
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2,
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0,
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0,
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},
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{
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"GLIBC_TUNABLES",
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"glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096",
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2,
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4096,
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0,
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},
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{
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"GLIBC_TUNABLES",
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"glibc.malloc.mmap_threshold=-1",
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0,
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SIZE_MAX,
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0,
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},
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/* Empty tunable are ignored. */
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{
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"GLIBC_TUNABLES",
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"glibc.malloc.check=2::glibc.malloc.mmap_threshold=4096",
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2,
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4096,
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0,
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},
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/* As well empty values. */
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{
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"GLIBC_TUNABLES",
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"glibc.malloc.check=:glibc.malloc.mmap_threshold=4096",
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0,
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4096,
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0,
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},
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/* Tunable are processed from left to right, so last one is the one set. */
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{
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"GLIBC_TUNABLES",
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"glibc.malloc.check=1:glibc.malloc.check=2",
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2,
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0,
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0,
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},
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{
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"GLIBC_TUNABLES",
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"glibc.malloc.check=1:glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096",
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2,
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4096,
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0,
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},
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{
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"GLIBC_TUNABLES",
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"glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096:glibc.malloc.check=1",
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1,
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4096,
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0,
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},
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/* 0x800 is larger than tunable maxval (0xff), so the tunable is unchanged. */
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{
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"GLIBC_TUNABLES",
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"glibc.malloc.perturb=0x800",
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0,
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0,
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0,
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},
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{
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"GLIBC_TUNABLES",
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"glibc.malloc.perturb=0x55",
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0,
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0,
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0x55,
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},
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/* Out of range values are just ignored. */
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{
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"GLIBC_TUNABLES",
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"glibc.malloc.perturb=0x800:glibc.malloc.mmap_threshold=4096",
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0,
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4096,
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0,
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},
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/* Invalid keys are ignored. */
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{
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"GLIBC_TUNABLES",
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":glibc.malloc.garbage=2:glibc.malloc.check=1",
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1,
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0,
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0,
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},
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{
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"GLIBC_TUNABLES",
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"glibc.malloc.perturb=0x800:not_valid.malloc.check=2:glibc.malloc.mmap_threshold=4096",
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0,
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4096,
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0,
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},
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{
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"GLIBC_TUNABLES",
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"glibc.not_valid.check=2:glibc.malloc.mmap_threshold=4096",
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0,
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4096,
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0,
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},
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{
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"GLIBC_TUNABLES",
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"not_valid.malloc.check=2:glibc.malloc.mmap_threshold=4096",
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0,
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4096,
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0,
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},
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/* Invalid subkeys are ignored. */
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{
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"GLIBC_TUNABLES",
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"glibc.malloc.garbage=2:glibc.maoc.mmap_threshold=4096:glibc.malloc.check=2",
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2,
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0,
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0,
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},
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{
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"GLIBC_TUNABLES",
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"glibc.malloc.check=4:glibc.malloc.garbage=2:glibc.maoc.mmap_threshold=4096",
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0,
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0,
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0,
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},
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{
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"GLIBC_TUNABLES",
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"not_valid.malloc.check=2",
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0,
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0,
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0,
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},
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{
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"GLIBC_TUNABLES",
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"glibc.not_valid.check=2",
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0,
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0,
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0,
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},
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/* An ill-formatted tunable in the for key=key=value will considere the
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value as 'key=value' (which can not be parsed as an integer). */
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{
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"GLIBC_TUNABLES",
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"glibc.malloc.mmap_threshold=glibc.malloc.mmap_threshold=4096",
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0,
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0,
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0,
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},
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/* Ill-formatted tunables string is not parsed. */
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{
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"GLIBC_TUNABLES",
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"glibc.malloc.mmap_threshold=glibc.malloc.mmap_threshold=4096:glibc.malloc.check=2",
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0,
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0,
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0,
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},
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{
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"GLIBC_TUNABLES",
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"glibc.malloc.check=2=2",
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0,
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0,
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0,
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},
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{
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"GLIBC_TUNABLES",
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"glibc.malloc.check=2=2:glibc.malloc.mmap_threshold=4096",
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0,
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0,
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0,
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},
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{
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"GLIBC_TUNABLES",
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"glibc.malloc.check=2=2:glibc.malloc.check=2",
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0,
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0,
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0,
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},
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{
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"GLIBC_TUNABLES",
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"glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096=4096",
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0,
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0,
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0,
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},
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{
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"GLIBC_TUNABLES",
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"glibc.malloc.check=2:glibc.malloc.mmap_threshold=4096=4096",
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0,
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0,
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0,
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},
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/* Invalid numbers are ignored. */
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{
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"GLIBC_TUNABLES",
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"glibc.malloc.check=abc:glibc.malloc.mmap_threshold=4096",
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0,
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4096,
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0,
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},
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{
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"GLIBC_TUNABLES",
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"glibc.malloc.check=2:glibc.malloc.mmap_threshold=abc",
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2,
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0,
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0,
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},
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{
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"GLIBC_TUNABLES",
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/* SIZE_MAX + 1 */
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"glibc.malloc.mmap_threshold=18446744073709551616",
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0,
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0,
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0,
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},
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/* Also check some tunable aliases. */
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{
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"MALLOC_CHECK_",
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"2",
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2,
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0,
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0,
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},
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{
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"MALLOC_MMAP_THRESHOLD_",
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"4096",
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0,
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4096,
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0,
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},
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{
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"MALLOC_PERTURB_",
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"0x55",
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0,
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0,
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0x55,
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},
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/* 0x800 is larger than tunable maxval (0xff), so the tunable is unchanged. */
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{
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"MALLOC_PERTURB_",
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"0x800",
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0,
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0,
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0,
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},
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/* Also check for repeated tunables with a count larger than the total number
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of tunables. */
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{
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"GLIBC_TUNABLES",
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NULL,
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2,
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0,
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0,
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},
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{
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"GLIBC_TUNABLES",
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NULL,
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1,
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0,
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0,
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},
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{
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"GLIBC_TUNABLES",
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NULL,
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0,
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0,
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0,
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},
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};
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static int
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handle_restart (int i)
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{
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TEST_COMPARE (tests[i].expected_malloc_check,
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TUNABLE_GET_FULL (glibc, malloc, check, int32_t, NULL));
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TEST_COMPARE (tests[i].expected_mmap_threshold,
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TUNABLE_GET_FULL (glibc, malloc, mmap_threshold, size_t, NULL));
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TEST_COMPARE (tests[i].expected_perturb,
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TUNABLE_GET_FULL (glibc, malloc, perturb, int32_t, NULL));
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return 0;
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}
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static int
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do_test (int argc, char *argv[])
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{
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/* We must have either:
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- One our fource parameters left if called initially:
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+ path to ld.so optional
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+ "--library-path" optional
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+ the library path optional
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+ the application name
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+ the test to check */
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TEST_VERIFY_EXIT (argc == 2 || argc == 5);
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if (restart)
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return handle_restart (atoi (argv[1]));
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char nteststr[INT_BUFSIZE_BOUND (int)];
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char *spargv[10];
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{
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int i = 0;
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for (; i < argc - 1; i++)
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spargv[i] = argv[i + 1];
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spargv[i++] = (char *) "--direct";
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spargv[i++] = (char *) "--restart";
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spargv[i++] = nteststr;
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spargv[i] = NULL;
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}
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/* Create a tunable line with the duplicate values with a total number
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larger than the different number of tunables. */
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{
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enum { tunables_list_size = array_length (tunable_list) };
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const char *value = "";
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for (int i = 0; i < tunables_list_size; i++)
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value = xasprintf ("%sglibc.malloc.check=2%c",
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value,
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i == (tunables_list_size - 1) ? '\0' : ':');
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tests[33].value = value;
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}
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/* Same as before, but the last tunable values is differen than the
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rest. */
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{
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enum { tunables_list_size = array_length (tunable_list) };
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const char *value = "";
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for (int i = 0; i < tunables_list_size - 1; i++)
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value = xasprintf ("%sglibc.malloc.check=2:", value);
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value = xasprintf ("%sglibc.malloc.check=1", value);
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tests[34].value = value;
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}
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/* Same as before, but with an invalid last entry. */
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{
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enum { tunables_list_size = array_length (tunable_list) };
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const char *value = "";
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for (int i = 0; i < tunables_list_size - 1; i++)
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value = xasprintf ("%sglibc.malloc.check=2:", value);
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value = xasprintf ("%sglibc.malloc.check=1=1", value);
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tests[35].value = value;
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}
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for (int i = 0; i < array_length (tests); i++)
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{
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snprintf (nteststr, sizeof nteststr, "%d", i);
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printf ("[%d] Spawned test for %s=%s\n",
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i,
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tests[i].name,
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tests[i].value);
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setenv (tests[i].name, tests[i].value, 1);
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struct support_capture_subprocess result
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= support_capture_subprogram (spargv[0], spargv, NULL);
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support_capture_subprocess_check (&result, "tst-tunables", 0,
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sc_allow_stderr);
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support_capture_subprocess_free (&result);
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unsetenv (tests[i].name);
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}
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return 0;
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}
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#define TEST_FUNCTION_ARGV do_test
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#include <support/test-driver.c>
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