clang 19.0.0git
SanitizerMetadata.cpp
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1//===--- SanitizerMetadata.cpp - Ignored entities for sanitizers ----------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// Class which emits metadata consumed by sanitizer instrumentation passes.
10//
11//===----------------------------------------------------------------------===//
12#include "SanitizerMetadata.h"
13#include "CodeGenModule.h"
14#include "clang/AST/Attr.h"
15#include "clang/AST/Type.h"
17#include "llvm/ADT/StringRef.h"
18#include "llvm/IR/Constants.h"
19
20using namespace clang;
21using namespace CodeGen;
22
23SanitizerMetadata::SanitizerMetadata(CodeGenModule &CGM) : CGM(CGM) {}
24
25static bool isAsanHwasanOrMemTag(const SanitizerSet &SS) {
26 return SS.hasOneOf(SanitizerKind::Address | SanitizerKind::KernelAddress |
27 SanitizerKind::HWAddress | SanitizerKind::MemTag);
28}
29
31 if (Mask & (SanitizerKind::Address | SanitizerKind::KernelAddress))
32 Mask |= SanitizerKind::Address | SanitizerKind::KernelAddress;
33 // Note: KHWASan doesn't support globals.
34 return Mask;
35}
36
37void SanitizerMetadata::reportGlobal(llvm::GlobalVariable *GV,
38 SourceLocation Loc, StringRef Name,
39 QualType Ty,
40 SanitizerMask NoSanitizeAttrMask,
41 bool IsDynInit) {
42 SanitizerSet FsanitizeArgument = CGM.getLangOpts().Sanitize;
43 if (!isAsanHwasanOrMemTag(FsanitizeArgument))
44 return;
45
46 FsanitizeArgument.Mask = expandKernelSanitizerMasks(FsanitizeArgument.Mask);
47 NoSanitizeAttrMask = expandKernelSanitizerMasks(NoSanitizeAttrMask);
48 SanitizerSet NoSanitizeAttrSet = {NoSanitizeAttrMask &
49 FsanitizeArgument.Mask};
50
51 llvm::GlobalVariable::SanitizerMetadata Meta;
52 if (GV->hasSanitizerMetadata())
53 Meta = GV->getSanitizerMetadata();
54
55 Meta.NoAddress |= NoSanitizeAttrSet.hasOneOf(SanitizerKind::Address);
56 Meta.NoAddress |= CGM.isInNoSanitizeList(
57 FsanitizeArgument.Mask & SanitizerKind::Address, GV, Loc, Ty);
58
59 Meta.NoHWAddress |= NoSanitizeAttrSet.hasOneOf(SanitizerKind::HWAddress);
60 Meta.NoHWAddress |= CGM.isInNoSanitizeList(
61 FsanitizeArgument.Mask & SanitizerKind::HWAddress, GV, Loc, Ty);
62
63 Meta.Memtag |=
64 static_cast<bool>(FsanitizeArgument.Mask & SanitizerKind::MemtagGlobals);
65 Meta.Memtag &= !NoSanitizeAttrSet.hasOneOf(SanitizerKind::MemTag);
66 Meta.Memtag &= !CGM.isInNoSanitizeList(
67 FsanitizeArgument.Mask & SanitizerKind::MemTag, GV, Loc, Ty);
68
69 Meta.IsDynInit = IsDynInit && !Meta.NoAddress &&
70 FsanitizeArgument.has(SanitizerKind::Address) &&
71 !CGM.isInNoSanitizeList(SanitizerKind::Address |
72 SanitizerKind::KernelAddress,
73 GV, Loc, Ty, "init");
74
75 GV->setSanitizerMetadata(Meta);
76}
77
78void SanitizerMetadata::reportGlobal(llvm::GlobalVariable *GV, const VarDecl &D,
79 bool IsDynInit) {
81 return;
82 std::string QualName;
83 llvm::raw_string_ostream OS(QualName);
85
86 auto getNoSanitizeMask = [](const VarDecl &D) {
87 if (D.hasAttr<DisableSanitizerInstrumentationAttr>())
88 return SanitizerKind::All;
89
90 SanitizerMask NoSanitizeMask;
91 for (auto *Attr : D.specific_attrs<NoSanitizeAttr>())
92 NoSanitizeMask |= Attr->getMask();
93
94 return NoSanitizeMask;
95 };
96
97 reportGlobal(GV, D.getLocation(), OS.str(), D.getType(), getNoSanitizeMask(D),
98 IsDynInit);
99}
100
101void SanitizerMetadata::disableSanitizerForGlobal(llvm::GlobalVariable *GV) {
102 reportGlobal(GV, SourceLocation(), "", QualType(), SanitizerKind::All);
103}
SanitizerMask expandKernelSanitizerMasks(SanitizerMask Mask)
static bool isAsanHwasanOrMemTag(const SanitizerSet &SS)
Defines the SourceManager interface.
C Language Family Type Representation.
Attr - This represents one attribute.
Definition: Attr.h:42
This class organizes the cross-function state that is used while generating LLVM code.
bool isInNoSanitizeList(SanitizerMask Kind, llvm::Function *Fn, SourceLocation Loc) const
const LangOptions & getLangOpts() const
void disableSanitizerForGlobal(llvm::GlobalVariable *GV)
void reportGlobal(llvm::GlobalVariable *GV, const VarDecl &D, bool IsDynInit=false)
llvm::iterator_range< specific_attr_iterator< T > > specific_attrs() const
Definition: DeclBase.h:564
SourceLocation getLocation() const
Definition: DeclBase.h:444
bool hasAttr() const
Definition: DeclBase.h:582
SanitizerSet Sanitize
Set of enabled sanitizers.
Definition: LangOptions.h:424
void printQualifiedName(raw_ostream &OS) const
Returns a human-readable qualified name for this declaration, like A::B::i, for i being member of nam...
Definition: Decl.cpp:1690
A (possibly-)qualified type.
Definition: Type.h:737
Encodes a location in the source.
QualType getType() const
Definition: Decl.h:717
Represents a variable declaration or definition.
Definition: Decl.h:918
The JSON file list parser is used to communicate input to InstallAPI.
bool has(SanitizerMask K) const
Check if a certain (single) sanitizer is enabled.
Definition: Sanitizers.h:159
SanitizerMask Mask
Bitmask of enabled sanitizers.
Definition: Sanitizers.h:182
bool hasOneOf(SanitizerMask K) const
Check if one or more sanitizers are enabled.
Definition: Sanitizers.h:165