forked from OSchip/llvm-project
137 lines
4.3 KiB
C++
137 lines
4.3 KiB
C++
//===-- scudo_flags.cpp -----------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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///
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/// Hardened Allocator flag parsing logic.
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///
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//===----------------------------------------------------------------------===//
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#include "scudo_flags.h"
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#include "scudo_interface_internal.h"
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#include "scudo_utils.h"
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#include "sanitizer_common/sanitizer_flags.h"
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#include "sanitizer_common/sanitizer_flag_parser.h"
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namespace __scudo {
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static Flags ScudoFlags; // Use via getFlags().
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void Flags::setDefaults() {
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#define SCUDO_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
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#include "scudo_flags.inc"
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#undef SCUDO_FLAG
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}
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static void RegisterScudoFlags(FlagParser *parser, Flags *f) {
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#define SCUDO_FLAG(Type, Name, DefaultValue, Description) \
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RegisterFlag(parser, #Name, Description, &f->Name);
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#include "scudo_flags.inc"
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#undef SCUDO_FLAG
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}
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static const char *getCompileDefinitionScudoDefaultOptions() {
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#ifdef SCUDO_DEFAULT_OPTIONS
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return SANITIZER_STRINGIFY(SCUDO_DEFAULT_OPTIONS);
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#else
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return "";
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#endif
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}
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static const char *getScudoDefaultOptions() {
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return (&__scudo_default_options) ? __scudo_default_options() : "";
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}
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void initFlags() {
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SetCommonFlagsDefaults();
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{
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CommonFlags cf;
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cf.CopyFrom(*common_flags());
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cf.exitcode = 1;
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OverrideCommonFlags(cf);
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}
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Flags *f = getFlags();
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f->setDefaults();
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FlagParser ScudoParser;
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RegisterScudoFlags(&ScudoParser, f);
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RegisterCommonFlags(&ScudoParser);
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// Override from compile definition.
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ScudoParser.ParseString(getCompileDefinitionScudoDefaultOptions());
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// Override from user-specified string.
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ScudoParser.ParseString(getScudoDefaultOptions());
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// Override from environment.
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ScudoParser.ParseStringFromEnv("SCUDO_OPTIONS");
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InitializeCommonFlags();
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// Sanity checks and default settings for the Quarantine parameters.
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if (f->QuarantineSizeMb >= 0) {
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// Backward compatible logic if QuarantineSizeMb is set.
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if (f->QuarantineSizeKb >= 0) {
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dieWithMessage("ERROR: please use either QuarantineSizeMb (deprecated) "
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"or QuarantineSizeKb, but not both\n");
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}
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if (f->QuarantineChunksUpToSize >= 0) {
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dieWithMessage("ERROR: QuarantineChunksUpToSize cannot be used in "
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" conjunction with the deprecated QuarantineSizeMb option\n");
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}
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// If everything is in order, update QuarantineSizeKb accordingly.
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f->QuarantineSizeKb = f->QuarantineSizeMb * 1024;
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} else {
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// Otherwise proceed with the new options.
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if (f->QuarantineSizeKb < 0) {
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const int DefaultQuarantineSizeKb = FIRST_32_SECOND_64(64, 256);
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f->QuarantineSizeKb = DefaultQuarantineSizeKb;
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}
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if (f->QuarantineChunksUpToSize < 0) {
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const int DefaultQuarantineChunksUpToSize = FIRST_32_SECOND_64(512, 2048);
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f->QuarantineChunksUpToSize = DefaultQuarantineChunksUpToSize;
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}
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}
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// We enforce an upper limit for the chunk quarantine threshold of 4Mb.
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if (f->QuarantineChunksUpToSize > (4 * 1024 * 1024)) {
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dieWithMessage("ERROR: the chunk quarantine threshold is too large\n");
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}
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// We enforce an upper limit for the quarantine size of 32Mb.
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if (f->QuarantineSizeKb > (32 * 1024)) {
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dieWithMessage("ERROR: the quarantine size is too large\n");
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}
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if (f->ThreadLocalQuarantineSizeKb < 0) {
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const int DefaultThreadLocalQuarantineSizeKb = FIRST_32_SECOND_64(16, 64);
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f->ThreadLocalQuarantineSizeKb = DefaultThreadLocalQuarantineSizeKb;
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}
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// And an upper limit of 8Mb for the thread quarantine cache.
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if (f->ThreadLocalQuarantineSizeKb > (8 * 1024)) {
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dieWithMessage("ERROR: the per thread quarantine cache size is too "
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"large\n");
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}
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if (f->ThreadLocalQuarantineSizeKb == 0 && f->QuarantineSizeKb > 0) {
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dieWithMessage("ERROR: ThreadLocalQuarantineSizeKb can be set to 0 only "
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"when QuarantineSizeKb is set to 0\n");
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}
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}
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Flags *getFlags() {
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return &ScudoFlags;
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}
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} // namespace __scudo
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#if !SANITIZER_SUPPORTS_WEAK_HOOKS
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SANITIZER_INTERFACE_WEAK_DEF(const char*, __scudo_default_options, void) {
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return "";
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}
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#endif
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