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[DWARFDebugLine] Check for (EOF) errors when parsing v5 content descriptors 

Summary:
Without that we could be silently reading zeroes, as that's the default
DataExtractor behavior. The entire parse would still most likely fail,
but it would do that with a seemingly unrelated/nonsensical error
message.

Reviewers: dblaikie, probinson, jhenderson

Subscribers: hiraditya, MaskRay, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D77554
This commit is contained in:
Pavel Labath 2020-03-23 11:40:25 +01:00
parent f8a42bca28
commit 100483b969
2 changed files with 78 additions and 4 deletions
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14
llvm/lib/DebugInfo/DWARF/DWARFDebugLine.cpp
View File

@ -219,14 +219,15 @@ parseV2DirFileTables(const DWARFDataExtractor &DebugLineData,
static llvm::Expected<ContentDescriptors>
parseV5EntryFormat(const DWARFDataExtractor &DebugLineData, uint64_t *OffsetPtr,
DWARFDebugLine::ContentTypeTracker *ContentTypes) {
Error Err = Error::success();
ContentDescriptors Descriptors;
int FormatCount = DebugLineData.getU8(OffsetPtr);
int FormatCount = DebugLineData.getU8(OffsetPtr, &Err);
bool HasPath = false;
for (int I = 0; I != FormatCount; ++I) {
for (int I = 0; I != FormatCount && !Err; ++I) {
ContentDescriptor Descriptor;
Descriptor.Type =
dwarf::LineNumberEntryFormat(DebugLineData.getULEB128(OffsetPtr));
Descriptor.Form = dwarf::Form(DebugLineData.getULEB128(OffsetPtr));
dwarf::LineNumberEntryFormat(DebugLineData.getULEB128(OffsetPtr, &Err));
Descriptor.Form = dwarf::Form(DebugLineData.getULEB128(OffsetPtr, &Err));
if (Descriptor.Type == dwarf::DW_LNCT_path)
HasPath = true;
if (ContentTypes)
@ -234,6 +235,11 @@ parseV5EntryFormat(const DWARFDataExtractor &DebugLineData, uint64_t *OffsetPtr,
Descriptors.push_back(Descriptor);
}
if (Err)
return createStringError(errc::invalid_argument,
"failed to parse entry content descriptors: %s",
toString(std::move(Err)).c_str());
if (!HasPath)
return createStringError(errc::invalid_argument,
"failed to parse entry content descriptions"

68
llvm/test/tools/llvm-dwarfdump/X86/debug_line_short_prologue.s Normal file
View File

@ -0,0 +1,68 @@
## Test cases when we run into the end of section while parsing a line table
## prologue.
# RUN: llvm-mc -triple x86_64-pc-linux %s -filetype=obj --defsym CASE=0 -o %t0
# RUN: llvm-dwarfdump -debug-line %t0 2>&1 | FileCheck %s --check-prefixes=ALL,C0
# RUN: llvm-mc -triple x86_64-pc-linux %s -filetype=obj --defsym CASE=1 -o %t1
# RUN: llvm-dwarfdump -debug-line %t1 2>&1 | FileCheck %s --check-prefixes=ALL,C1
# RUN: llvm-mc -triple x86_64-pc-linux %s -filetype=obj --defsym CASE=2 -o %t2
# RUN: llvm-dwarfdump -debug-line %t2 2>&1 | FileCheck %s --check-prefixes=ALL,C2
# RUN: llvm-mc -triple x86_64-pc-linux %s -filetype=obj --defsym CASE=3 -o %t3
# RUN: llvm-dwarfdump -debug-line %t3 2>&1 | FileCheck %s --check-prefixes=ALL,OK
# ALL: debug_line[0x00000000]
# C0-NEXT: warning: parsing line table prologue at 0x00000000 found an invalid directory or file table description at 0x00000027
# C0-NEXT: warning: failed to parse entry content descriptors: unexpected end of data at offset 0x27
# C1-NEXT: warning: parsing line table prologue at 0x00000000 found an invalid directory or file table description at 0x0000002a
# C1-NEXT: warning: failed to parse entry content descriptors: malformed uleb128, extends past end
# C2-NEXT: warning: parsing line table prologue at 0x00000000 found an invalid directory or file table description at 0x0000002b
# C2-NEXT: warning: failed to parse entry content descriptors: malformed uleb128, extends past end
# ALL: include_directories[ 0] = "/tmp"
# OK: file_names[ 0]:
# OK-NEXT: name: "foo"
# OK-NEXT: dir_index: 0
.section .debug_line,"",@progbits
.long .Lend-.Lstart # Length of Unit
.Lstart:
.short 5 # DWARF version number
.byte 8 # Address Size
.byte 0 # Segment Selector Size
.long .Lprologue_end-.Lprologue_start # Length of Prologue
.Lprologue_start:
.byte 1 # Minimum Instruction Length
.byte 1 # Maximum Operations per Instruction
.byte 1 # Default is_stmt
.byte -5 # Line Base
.byte 14 # Line Range
.byte 13 # Opcode Base
.byte 0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1 # Standard Opcode Lengths
# Directory table format
.byte 1 # One element per directory entry
.byte 1 # DW_LNCT_path
.byte 0x08 # DW_FORM_string
# Directory table entries
.byte 1 # 1 directory
.asciz "/tmp"
# File table format
.if CASE >= 1
.byte 2 # 2 elements per file entry
.byte 1 # DW_LNCT_path
.byte 8 # DW_FORM_string
.if CASE >= 2
.byte 2 # DW_LNCT_directory_index
.if CASE >= 3
.byte 11 # DW_FORM_data1
# File table entries
.byte 1
.asciz "foo"
.byte 0
.endif
.endif
.endif
.Lprologue_end:
.Lend: