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1148dc5274
Summary: This update introduces i386 support for the Scudo Hardened Allocator, and offers software alternatives for functions that used to require hardware specific instruction sets. This should make porting to new architectures easier. Among the changes: - The chunk header has been changed to accomodate the size limitations encountered on 32-bit architectures. We now fit everything in 64-bit. This was achieved by storing the amount of unused bytes in an allocation rather than the size itself, as one can be deduced from the other with the help of the GetActuallyAllocatedSize function. As it turns out, this header can be used for both 64 and 32 bit, and as such we dropped the requirement for the 128-bit compare and exchange instruction support (cmpxchg16b). - Add 32-bit support for the checksum and the PRNG functions: if the SSE 4.2 instruction set is supported, use the 32-bit CRC32 instruction, and in the XorShift128, use a 32-bit based state instead of 64-bit. - Add software support for CRC32: if SSE 4.2 is not supported, fallback on a software implementation. - Modify tests that were not 32-bit compliant, and expand them to cover more allocation and alignment sizes. The random shuffle test has been deactivated for linux-i386 & linux-i686 as the 32-bit sanitizer allocator doesn't currently randomize chunks. Reviewers: alekseyshl, kcc Subscribers: filcab, llvm-commits, tberghammer, danalbert, srhines, mgorny, modocache Differential Revision: https://reviews.llvm.org/D26358 llvm-svn: 288255
94 lines
2.7 KiB
C++
94 lines
2.7 KiB
C++
//===-- scudo_flags.cpp -----------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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_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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extern "C" SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
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const char* __scudo_default_options();
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namespace __scudo {
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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 *callGetScudoDefaultOptions() {
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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 user-specified string.
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const char *ScudoDefaultOptions = callGetScudoDefaultOptions();
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ScudoParser.ParseString(ScudoDefaultOptions);
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// Override from environment.
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ScudoParser.ParseString(GetEnv("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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const int DefaultQuarantineSizeMb = 64;
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f->QuarantineSizeMb = DefaultQuarantineSizeMb;
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}
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// We enforce an upper limit for the quarantine size of 4Gb.
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if (f->QuarantineSizeMb > (4 * 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 = 1024;
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f->ThreadLocalQuarantineSizeKb = DefaultThreadLocalQuarantineSizeKb;
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}
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// And an upper limit of 128Mb for the thread quarantine cache.
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if (f->ThreadLocalQuarantineSizeKb > (128 * 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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}
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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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