[LLD][COFF] Store and validate load config in SymbolTable #120324
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Improve diagnostics for invalid load configurations.
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We already look up the load configuration in two places in the writer, and ARM64X will require more of it, so storing it in the symbol table is more convenient. This change also replaces |
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@llvm/pr-subscribers-platform-windows @llvm/pr-subscribers-lld Author: Jacek Caban (cjacek) ChangesImprove diagnostics for invalid load configurations. Full diff: https://github.com/llvm/llvm-project/pull/120324.diff 8 Files Affected:
diff --git a/lld/COFF/Driver.cpp b/lld/COFF/Driver.cpp
index bef55abb7f856e..9d45e9b926b1f6 100644
--- a/lld/COFF/Driver.cpp
+++ b/lld/COFF/Driver.cpp
@@ -2822,6 +2822,7 @@ void LinkerDriver::linkerMain(ArrayRef<const char *> argsArr) {
if (ctx.symtabEC)
ctx.symtabEC->initializeECThunks();
+ ctx.forEachSymtab([](SymbolTable &symtab) { symtab.initializeLoadConfig(); });
// Identify unreferenced COMDAT sections.
if (config->doGC) {
diff --git a/lld/COFF/SymbolTable.cpp b/lld/COFF/SymbolTable.cpp
index 6b3375e13e8393..7e243fc626d38d 100644
--- a/lld/COFF/SymbolTable.cpp
+++ b/lld/COFF/SymbolTable.cpp
@@ -27,6 +27,7 @@
#include <utility>
using namespace llvm;
+using namespace llvm::support;
namespace lld::coff {
@@ -595,6 +596,52 @@ std::pair<Symbol *, bool> SymbolTable::insert(StringRef name, InputFile *file) {
return result;
}
+void SymbolTable::initializeLoadConfig() {
+ auto sym =
+ dyn_cast_or_null<DefinedRegular>(findUnderscore("_load_config_used"));
+ if (!sym) {
+ if (ctx.config.guardCF != GuardCFLevel::Off)
+ Warn(ctx)
+ << "Control Flow Guard is enabled but '_load_config_used' is missing";
+ if (ctx.config.dependentLoadFlags)
+ Warn(ctx) << "_load_config_used not found, /dependentloadflag will have "
+ "no effect";
+ return;
+ }
+
+ SectionChunk *sc = sym->getChunk();
+ if (!sc->hasData) {
+ Err(ctx) << "_load_config_used points to uninitialized data";
+ return;
+ }
+ uint64_t offsetInChunk = sym->getValue();
+ if (offsetInChunk + 4 > sc->getSize()) {
+ Err(ctx) << "_load_config_used section chunk is too small";
+ return;
+ }
+
+ ArrayRef<uint8_t> secContents = sc->getContents();
+ loadConfigSize =
+ *reinterpret_cast<const ulittle32_t *>(&secContents[offsetInChunk]);
+ if (offsetInChunk + loadConfigSize > sc->getSize()) {
+ Err(ctx) << "_load_config_used specifies a size larger than its containing "
+ "section chunk";
+ return;
+ }
+
+ uint32_t expectedAlign = ctx.config.is64() ? 8 : 4;
+ if (sc->getAlignment() < expectedAlign)
+ Warn(ctx) << "'_load_config_used' is misaligned (expected alignment to be "
+ << expectedAlign << " bytes, got " << sc->getAlignment()
+ << " instead)";
+ else if (!isAligned(Align(expectedAlign), offsetInChunk))
+ Warn(ctx) << "'_load_config_used' is misaligned (section offset is 0x"
+ << Twine::utohexstr(sym->getValue()) << " not aligned to "
+ << expectedAlign << " bytes)";
+
+ loadConfigSym = sym;
+}
+
void SymbolTable::addEntryThunk(Symbol *from, Symbol *to) {
entryThunks.push_back({from, to});
}
diff --git a/lld/COFF/SymbolTable.h b/lld/COFF/SymbolTable.h
index b694893b903aa3..8548a6d036a9db 100644
--- a/lld/COFF/SymbolTable.h
+++ b/lld/COFF/SymbolTable.h
@@ -138,6 +138,10 @@ class SymbolTable {
callback(pair.second);
}
+ DefinedRegular *loadConfigSym = nullptr;
+ uint32_t loadConfigSize = 0;
+ void initializeLoadConfig();
+
private:
/// Given a name without "__imp_" prefix, returns a defined symbol
/// with the "__imp_" prefix, if it exists.
diff --git a/lld/COFF/Writer.cpp b/lld/COFF/Writer.cpp
index 3c6112b7fc89ad..e6b239c83dd4a2 100644
--- a/lld/COFF/Writer.cpp
+++ b/lld/COFF/Writer.cpp
@@ -1837,22 +1837,10 @@ template <typename PEHeaderTy> void Writer::writeHeader() {
dir[DEBUG_DIRECTORY].RelativeVirtualAddress = debugDirectory->getRVA();
dir[DEBUG_DIRECTORY].Size = debugDirectory->getSize();
}
- if (Symbol *sym = ctx.symtab.findUnderscore("_load_config_used")) {
- if (auto *b = dyn_cast<DefinedRegular>(sym)) {
- SectionChunk *sc = b->getChunk();
- assert(b->getRVA() >= sc->getRVA());
- uint64_t offsetInChunk = b->getRVA() - sc->getRVA();
- if (!sc->hasData || offsetInChunk + 4 > sc->getSize())
- Fatal(ctx) << "_load_config_used is malformed";
-
- ArrayRef<uint8_t> secContents = sc->getContents();
- uint32_t loadConfigSize =
- *reinterpret_cast<const ulittle32_t *>(&secContents[offsetInChunk]);
- if (offsetInChunk + loadConfigSize > sc->getSize())
- Fatal(ctx) << "_load_config_used is too large";
- dir[LOAD_CONFIG_TABLE].RelativeVirtualAddress = b->getRVA();
- dir[LOAD_CONFIG_TABLE].Size = loadConfigSize;
- }
+ if (ctx.symtab.loadConfigSym) {
+ dir[LOAD_CONFIG_TABLE].RelativeVirtualAddress =
+ ctx.symtab.loadConfigSym->getRVA();
+ dir[LOAD_CONFIG_TABLE].Size = ctx.symtab.loadConfigSize;
}
if (!delayIdata.empty()) {
dir[DELAY_IMPORT_DESCRIPTOR].RelativeVirtualAddress =
@@ -2649,31 +2637,14 @@ void Writer::fixTlsAlignment() {
}
void Writer::prepareLoadConfig() {
- Symbol *sym = ctx.symtab.findUnderscore("_load_config_used");
- auto *b = cast_if_present<DefinedRegular>(sym);
- if (!b) {
- if (ctx.config.guardCF != GuardCFLevel::Off)
- Warn(ctx)
- << "Control Flow Guard is enabled but '_load_config_used' is missing";
- if (ctx.config.dependentLoadFlags)
- Warn(ctx) << "_load_config_used not found, /dependentloadflag will have "
- "no effect";
+ if (!ctx.symtab.loadConfigSym)
return;
- }
- OutputSection *sec = ctx.getOutputSection(b->getChunk());
- uint8_t *buf = buffer->getBufferStart();
- uint8_t *secBuf = buf + sec->getFileOff();
- uint8_t *symBuf = secBuf + (b->getRVA() - sec->getRVA());
- uint32_t expectedAlign = ctx.config.is64() ? 8 : 4;
- if (b->getChunk()->getAlignment() < expectedAlign)
- Warn(ctx) << "'_load_config_used' is misaligned (expected alignment to be "
- << expectedAlign << " bytes, got "
- << b->getChunk()->getAlignment() << " instead)";
- else if (!isAligned(Align(expectedAlign), b->getRVA()))
- Warn(ctx) << "'_load_config_used' is misaligned (RVA is 0x"
- << Twine::utohexstr(b->getRVA()) << " not aligned to "
- << expectedAlign << " bytes)";
+ OutputSection *sec =
+ ctx.getOutputSection(ctx.symtab.loadConfigSym->getChunk());
+ uint8_t *secBuf = buffer->getBufferStart() + sec->getFileOff();
+ uint8_t *symBuf =
+ secBuf + (ctx.symtab.loadConfigSym->getRVA() - sec->getRVA());
if (ctx.config.is64())
prepareLoadConfig(reinterpret_cast<coff_load_configuration64 *>(symBuf));
diff --git a/lld/test/COFF/guard-warnings.s b/lld/test/COFF/guard-warnings.s
index 77448ee95c0095..092871597d1f80 100644
--- a/lld/test/COFF/guard-warnings.s
+++ b/lld/test/COFF/guard-warnings.s
@@ -38,7 +38,7 @@
# RUN: llvm-mc -triple x86_64-windows-msvc %t/loadcfg-misaligned2.s -filetype=obj -o %t/loadcfg-misaligned2.obj
# RUN: lld-link %t/main.obj %t/loadcfg-misaligned2.obj -guard:cf,longjmp,ehcont -out:%t-misaligned2.exe -entry:main %basename_t-exp.lib 2>&1 | FileCheck %s --check-prefix=WARN_ALIGN2
-# WARN_ALIGN2: warning: '_load_config_used' is misaligned (RVA is 0x{{[0-9A-F]*}}2 not aligned to 8 bytes)
+# WARN_ALIGN2: warning: '_load_config_used' is misaligned (section offset is 0x{{[0-9A-F]*}}2 not aligned to 8 bytes)
# RUN: llvm-mc -triple x86_64-windows-msvc %t/loadcfg-full.s -filetype=obj -o %t/loadcfg-full.obj
# RUN: lld-link %t/main.obj %t/loadcfg-full.obj -guard:cf,longjmp,ehcont -out:%t.exe -entry:main %basename_t-exp.lib 2>&1 | FileCheck %s --check-prefix=NOWARN --allow-empty
diff --git a/lld/test/COFF/loadcfg-short.test b/lld/test/COFF/loadcfg-short.test
new file mode 100644
index 00000000000000..dd4d4389ddc1cc
--- /dev/null
+++ b/lld/test/COFF/loadcfg-short.test
@@ -0,0 +1,33 @@
+# RUN: yaml2obj %s -o %t.obj
+# RUN: not lld-link -out:%t.dll %t.obj -dll -noentry 2>&1 | FileCheck %s
+# CHECK: lld-link: error: _load_config_used section chunk is too small
+
+--- !COFF
+header:
+ Machine: IMAGE_FILE_MACHINE_AMD64
+ Characteristics: []
+sections:
+ - Name: .rdata
+ Characteristics: [ IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_READ ]
+ Alignment: 16
+ SectionData: '030000'
+symbols:
+ - Name: .rdata
+ Value: 0
+ SectionNumber: 1
+ SimpleType: IMAGE_SYM_TYPE_NULL
+ ComplexType: IMAGE_SYM_DTYPE_NULL
+ StorageClass: IMAGE_SYM_CLASS_STATIC
+ SectionDefinition:
+ Length: 112
+ NumberOfRelocations: 0
+ NumberOfLinenumbers: 0
+ CheckSum: 0
+ Number: 3
+ - Name: _load_config_used
+ Value: 0
+ SectionNumber: 1
+ SimpleType: IMAGE_SYM_TYPE_NULL
+ ComplexType: IMAGE_SYM_DTYPE_NULL
+ StorageClass: IMAGE_SYM_CLASS_EXTERNAL
+...
diff --git a/lld/test/COFF/loadcfg-size.test b/lld/test/COFF/loadcfg-size.test
new file mode 100644
index 00000000000000..871590f2328b63
--- /dev/null
+++ b/lld/test/COFF/loadcfg-size.test
@@ -0,0 +1,33 @@
+# RUN: yaml2obj %s -o %t.obj
+# RUN: not lld-link -out:%t.dll %t.obj -dll -noentry 2>&1 | FileCheck %s
+# CHECK: lld-link: error: _load_config_used specifies a size larger than its containing section chunk
+
+--- !COFF
+header:
+ Machine: IMAGE_FILE_MACHINE_AMD64
+ Characteristics: []
+sections:
+ - Name: .rdata
+ Characteristics: [ IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_READ ]
+ Alignment: 16
+ SectionData: '0c00000000000000'
+symbols:
+ - Name: .rdata
+ Value: 0
+ SectionNumber: 1
+ SimpleType: IMAGE_SYM_TYPE_NULL
+ ComplexType: IMAGE_SYM_DTYPE_NULL
+ StorageClass: IMAGE_SYM_CLASS_STATIC
+ SectionDefinition:
+ Length: 112
+ NumberOfRelocations: 0
+ NumberOfLinenumbers: 0
+ CheckSum: 0
+ Number: 3
+ - Name: _load_config_used
+ Value: 0
+ SectionNumber: 1
+ SimpleType: IMAGE_SYM_TYPE_NULL
+ ComplexType: IMAGE_SYM_DTYPE_NULL
+ StorageClass: IMAGE_SYM_CLASS_EXTERNAL
+...
diff --git a/lld/test/COFF/loadcfg-uninitialized.test b/lld/test/COFF/loadcfg-uninitialized.test
new file mode 100644
index 00000000000000..5f956bc7224bc9
--- /dev/null
+++ b/lld/test/COFF/loadcfg-uninitialized.test
@@ -0,0 +1,33 @@
+# RUN: yaml2obj %s -o %t.obj
+# RUN: not lld-link -out:%t.dll %t.obj -dll -noentry 2>&1 | FileCheck %s
+# CHECK: lld-link: error: _load_config_used points to uninitialized data
+
+--- !COFF
+header:
+ Machine: IMAGE_FILE_MACHINE_AMD64
+ Characteristics: []
+sections:
+ - Name: .rdata
+ Characteristics: [ IMAGE_SCN_CNT_UNINITIALIZED_DATA, IMAGE_SCN_MEM_READ ]
+ Alignment: 16
+ VirtualSize: 0x140
+symbols:
+ - Name: .rdata
+ Value: 0
+ SectionNumber: 1
+ SimpleType: IMAGE_SYM_TYPE_NULL
+ ComplexType: IMAGE_SYM_DTYPE_NULL
+ StorageClass: IMAGE_SYM_CLASS_STATIC
+ SectionDefinition:
+ Length: 112
+ NumberOfRelocations: 0
+ NumberOfLinenumbers: 0
+ CheckSum: 0
+ Number: 3
+ - Name: _load_config_used
+ Value: 0
+ SectionNumber: 1
+ SimpleType: IMAGE_SYM_TYPE_NULL
+ ComplexType: IMAGE_SYM_DTYPE_NULL
+ StorageClass: IMAGE_SYM_CLASS_EXTERNAL
+...
|
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@llvm/pr-subscribers-lld-coff Author: Jacek Caban (cjacek) ChangesImprove diagnostics for invalid load configurations. Full diff: https://github.com/llvm/llvm-project/pull/120324.diff 8 Files Affected:
diff --git a/lld/COFF/Driver.cpp b/lld/COFF/Driver.cpp
index bef55abb7f856e..9d45e9b926b1f6 100644
--- a/lld/COFF/Driver.cpp
+++ b/lld/COFF/Driver.cpp
@@ -2822,6 +2822,7 @@ void LinkerDriver::linkerMain(ArrayRef<const char *> argsArr) {
if (ctx.symtabEC)
ctx.symtabEC->initializeECThunks();
+ ctx.forEachSymtab([](SymbolTable &symtab) { symtab.initializeLoadConfig(); });
// Identify unreferenced COMDAT sections.
if (config->doGC) {
diff --git a/lld/COFF/SymbolTable.cpp b/lld/COFF/SymbolTable.cpp
index 6b3375e13e8393..7e243fc626d38d 100644
--- a/lld/COFF/SymbolTable.cpp
+++ b/lld/COFF/SymbolTable.cpp
@@ -27,6 +27,7 @@
#include <utility>
using namespace llvm;
+using namespace llvm::support;
namespace lld::coff {
@@ -595,6 +596,52 @@ std::pair<Symbol *, bool> SymbolTable::insert(StringRef name, InputFile *file) {
return result;
}
+void SymbolTable::initializeLoadConfig() {
+ auto sym =
+ dyn_cast_or_null<DefinedRegular>(findUnderscore("_load_config_used"));
+ if (!sym) {
+ if (ctx.config.guardCF != GuardCFLevel::Off)
+ Warn(ctx)
+ << "Control Flow Guard is enabled but '_load_config_used' is missing";
+ if (ctx.config.dependentLoadFlags)
+ Warn(ctx) << "_load_config_used not found, /dependentloadflag will have "
+ "no effect";
+ return;
+ }
+
+ SectionChunk *sc = sym->getChunk();
+ if (!sc->hasData) {
+ Err(ctx) << "_load_config_used points to uninitialized data";
+ return;
+ }
+ uint64_t offsetInChunk = sym->getValue();
+ if (offsetInChunk + 4 > sc->getSize()) {
+ Err(ctx) << "_load_config_used section chunk is too small";
+ return;
+ }
+
+ ArrayRef<uint8_t> secContents = sc->getContents();
+ loadConfigSize =
+ *reinterpret_cast<const ulittle32_t *>(&secContents[offsetInChunk]);
+ if (offsetInChunk + loadConfigSize > sc->getSize()) {
+ Err(ctx) << "_load_config_used specifies a size larger than its containing "
+ "section chunk";
+ return;
+ }
+
+ uint32_t expectedAlign = ctx.config.is64() ? 8 : 4;
+ if (sc->getAlignment() < expectedAlign)
+ Warn(ctx) << "'_load_config_used' is misaligned (expected alignment to be "
+ << expectedAlign << " bytes, got " << sc->getAlignment()
+ << " instead)";
+ else if (!isAligned(Align(expectedAlign), offsetInChunk))
+ Warn(ctx) << "'_load_config_used' is misaligned (section offset is 0x"
+ << Twine::utohexstr(sym->getValue()) << " not aligned to "
+ << expectedAlign << " bytes)";
+
+ loadConfigSym = sym;
+}
+
void SymbolTable::addEntryThunk(Symbol *from, Symbol *to) {
entryThunks.push_back({from, to});
}
diff --git a/lld/COFF/SymbolTable.h b/lld/COFF/SymbolTable.h
index b694893b903aa3..8548a6d036a9db 100644
--- a/lld/COFF/SymbolTable.h
+++ b/lld/COFF/SymbolTable.h
@@ -138,6 +138,10 @@ class SymbolTable {
callback(pair.second);
}
+ DefinedRegular *loadConfigSym = nullptr;
+ uint32_t loadConfigSize = 0;
+ void initializeLoadConfig();
+
private:
/// Given a name without "__imp_" prefix, returns a defined symbol
/// with the "__imp_" prefix, if it exists.
diff --git a/lld/COFF/Writer.cpp b/lld/COFF/Writer.cpp
index 3c6112b7fc89ad..e6b239c83dd4a2 100644
--- a/lld/COFF/Writer.cpp
+++ b/lld/COFF/Writer.cpp
@@ -1837,22 +1837,10 @@ template <typename PEHeaderTy> void Writer::writeHeader() {
dir[DEBUG_DIRECTORY].RelativeVirtualAddress = debugDirectory->getRVA();
dir[DEBUG_DIRECTORY].Size = debugDirectory->getSize();
}
- if (Symbol *sym = ctx.symtab.findUnderscore("_load_config_used")) {
- if (auto *b = dyn_cast<DefinedRegular>(sym)) {
- SectionChunk *sc = b->getChunk();
- assert(b->getRVA() >= sc->getRVA());
- uint64_t offsetInChunk = b->getRVA() - sc->getRVA();
- if (!sc->hasData || offsetInChunk + 4 > sc->getSize())
- Fatal(ctx) << "_load_config_used is malformed";
-
- ArrayRef<uint8_t> secContents = sc->getContents();
- uint32_t loadConfigSize =
- *reinterpret_cast<const ulittle32_t *>(&secContents[offsetInChunk]);
- if (offsetInChunk + loadConfigSize > sc->getSize())
- Fatal(ctx) << "_load_config_used is too large";
- dir[LOAD_CONFIG_TABLE].RelativeVirtualAddress = b->getRVA();
- dir[LOAD_CONFIG_TABLE].Size = loadConfigSize;
- }
+ if (ctx.symtab.loadConfigSym) {
+ dir[LOAD_CONFIG_TABLE].RelativeVirtualAddress =
+ ctx.symtab.loadConfigSym->getRVA();
+ dir[LOAD_CONFIG_TABLE].Size = ctx.symtab.loadConfigSize;
}
if (!delayIdata.empty()) {
dir[DELAY_IMPORT_DESCRIPTOR].RelativeVirtualAddress =
@@ -2649,31 +2637,14 @@ void Writer::fixTlsAlignment() {
}
void Writer::prepareLoadConfig() {
- Symbol *sym = ctx.symtab.findUnderscore("_load_config_used");
- auto *b = cast_if_present<DefinedRegular>(sym);
- if (!b) {
- if (ctx.config.guardCF != GuardCFLevel::Off)
- Warn(ctx)
- << "Control Flow Guard is enabled but '_load_config_used' is missing";
- if (ctx.config.dependentLoadFlags)
- Warn(ctx) << "_load_config_used not found, /dependentloadflag will have "
- "no effect";
+ if (!ctx.symtab.loadConfigSym)
return;
- }
- OutputSection *sec = ctx.getOutputSection(b->getChunk());
- uint8_t *buf = buffer->getBufferStart();
- uint8_t *secBuf = buf + sec->getFileOff();
- uint8_t *symBuf = secBuf + (b->getRVA() - sec->getRVA());
- uint32_t expectedAlign = ctx.config.is64() ? 8 : 4;
- if (b->getChunk()->getAlignment() < expectedAlign)
- Warn(ctx) << "'_load_config_used' is misaligned (expected alignment to be "
- << expectedAlign << " bytes, got "
- << b->getChunk()->getAlignment() << " instead)";
- else if (!isAligned(Align(expectedAlign), b->getRVA()))
- Warn(ctx) << "'_load_config_used' is misaligned (RVA is 0x"
- << Twine::utohexstr(b->getRVA()) << " not aligned to "
- << expectedAlign << " bytes)";
+ OutputSection *sec =
+ ctx.getOutputSection(ctx.symtab.loadConfigSym->getChunk());
+ uint8_t *secBuf = buffer->getBufferStart() + sec->getFileOff();
+ uint8_t *symBuf =
+ secBuf + (ctx.symtab.loadConfigSym->getRVA() - sec->getRVA());
if (ctx.config.is64())
prepareLoadConfig(reinterpret_cast<coff_load_configuration64 *>(symBuf));
diff --git a/lld/test/COFF/guard-warnings.s b/lld/test/COFF/guard-warnings.s
index 77448ee95c0095..092871597d1f80 100644
--- a/lld/test/COFF/guard-warnings.s
+++ b/lld/test/COFF/guard-warnings.s
@@ -38,7 +38,7 @@
# RUN: llvm-mc -triple x86_64-windows-msvc %t/loadcfg-misaligned2.s -filetype=obj -o %t/loadcfg-misaligned2.obj
# RUN: lld-link %t/main.obj %t/loadcfg-misaligned2.obj -guard:cf,longjmp,ehcont -out:%t-misaligned2.exe -entry:main %basename_t-exp.lib 2>&1 | FileCheck %s --check-prefix=WARN_ALIGN2
-# WARN_ALIGN2: warning: '_load_config_used' is misaligned (RVA is 0x{{[0-9A-F]*}}2 not aligned to 8 bytes)
+# WARN_ALIGN2: warning: '_load_config_used' is misaligned (section offset is 0x{{[0-9A-F]*}}2 not aligned to 8 bytes)
# RUN: llvm-mc -triple x86_64-windows-msvc %t/loadcfg-full.s -filetype=obj -o %t/loadcfg-full.obj
# RUN: lld-link %t/main.obj %t/loadcfg-full.obj -guard:cf,longjmp,ehcont -out:%t.exe -entry:main %basename_t-exp.lib 2>&1 | FileCheck %s --check-prefix=NOWARN --allow-empty
diff --git a/lld/test/COFF/loadcfg-short.test b/lld/test/COFF/loadcfg-short.test
new file mode 100644
index 00000000000000..dd4d4389ddc1cc
--- /dev/null
+++ b/lld/test/COFF/loadcfg-short.test
@@ -0,0 +1,33 @@
+# RUN: yaml2obj %s -o %t.obj
+# RUN: not lld-link -out:%t.dll %t.obj -dll -noentry 2>&1 | FileCheck %s
+# CHECK: lld-link: error: _load_config_used section chunk is too small
+
+--- !COFF
+header:
+ Machine: IMAGE_FILE_MACHINE_AMD64
+ Characteristics: []
+sections:
+ - Name: .rdata
+ Characteristics: [ IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_READ ]
+ Alignment: 16
+ SectionData: '030000'
+symbols:
+ - Name: .rdata
+ Value: 0
+ SectionNumber: 1
+ SimpleType: IMAGE_SYM_TYPE_NULL
+ ComplexType: IMAGE_SYM_DTYPE_NULL
+ StorageClass: IMAGE_SYM_CLASS_STATIC
+ SectionDefinition:
+ Length: 112
+ NumberOfRelocations: 0
+ NumberOfLinenumbers: 0
+ CheckSum: 0
+ Number: 3
+ - Name: _load_config_used
+ Value: 0
+ SectionNumber: 1
+ SimpleType: IMAGE_SYM_TYPE_NULL
+ ComplexType: IMAGE_SYM_DTYPE_NULL
+ StorageClass: IMAGE_SYM_CLASS_EXTERNAL
+...
diff --git a/lld/test/COFF/loadcfg-size.test b/lld/test/COFF/loadcfg-size.test
new file mode 100644
index 00000000000000..871590f2328b63
--- /dev/null
+++ b/lld/test/COFF/loadcfg-size.test
@@ -0,0 +1,33 @@
+# RUN: yaml2obj %s -o %t.obj
+# RUN: not lld-link -out:%t.dll %t.obj -dll -noentry 2>&1 | FileCheck %s
+# CHECK: lld-link: error: _load_config_used specifies a size larger than its containing section chunk
+
+--- !COFF
+header:
+ Machine: IMAGE_FILE_MACHINE_AMD64
+ Characteristics: []
+sections:
+ - Name: .rdata
+ Characteristics: [ IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_READ ]
+ Alignment: 16
+ SectionData: '0c00000000000000'
+symbols:
+ - Name: .rdata
+ Value: 0
+ SectionNumber: 1
+ SimpleType: IMAGE_SYM_TYPE_NULL
+ ComplexType: IMAGE_SYM_DTYPE_NULL
+ StorageClass: IMAGE_SYM_CLASS_STATIC
+ SectionDefinition:
+ Length: 112
+ NumberOfRelocations: 0
+ NumberOfLinenumbers: 0
+ CheckSum: 0
+ Number: 3
+ - Name: _load_config_used
+ Value: 0
+ SectionNumber: 1
+ SimpleType: IMAGE_SYM_TYPE_NULL
+ ComplexType: IMAGE_SYM_DTYPE_NULL
+ StorageClass: IMAGE_SYM_CLASS_EXTERNAL
+...
diff --git a/lld/test/COFF/loadcfg-uninitialized.test b/lld/test/COFF/loadcfg-uninitialized.test
new file mode 100644
index 00000000000000..5f956bc7224bc9
--- /dev/null
+++ b/lld/test/COFF/loadcfg-uninitialized.test
@@ -0,0 +1,33 @@
+# RUN: yaml2obj %s -o %t.obj
+# RUN: not lld-link -out:%t.dll %t.obj -dll -noentry 2>&1 | FileCheck %s
+# CHECK: lld-link: error: _load_config_used points to uninitialized data
+
+--- !COFF
+header:
+ Machine: IMAGE_FILE_MACHINE_AMD64
+ Characteristics: []
+sections:
+ - Name: .rdata
+ Characteristics: [ IMAGE_SCN_CNT_UNINITIALIZED_DATA, IMAGE_SCN_MEM_READ ]
+ Alignment: 16
+ VirtualSize: 0x140
+symbols:
+ - Name: .rdata
+ Value: 0
+ SectionNumber: 1
+ SimpleType: IMAGE_SYM_TYPE_NULL
+ ComplexType: IMAGE_SYM_DTYPE_NULL
+ StorageClass: IMAGE_SYM_CLASS_STATIC
+ SectionDefinition:
+ Length: 112
+ NumberOfRelocations: 0
+ NumberOfLinenumbers: 0
+ CheckSum: 0
+ Number: 3
+ - Name: _load_config_used
+ Value: 0
+ SectionNumber: 1
+ SimpleType: IMAGE_SYM_TYPE_NULL
+ ComplexType: IMAGE_SYM_DTYPE_NULL
+ StorageClass: IMAGE_SYM_CLASS_EXTERNAL
+...
|
mstorsjo
approved these changes
Dec 28, 2024
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Improve diagnostics for invalid load configurations.