Author: Greg Clayton Date: 2025-09-25T14:06:48-07:00 New Revision: 4193a90b4263ff8c9599b921882cfbd7052b8571
URL: https://github.com/llvm/llvm-project/commit/4193a90b4263ff8c9599b921882cfbd7052b8571 DIFF: https://github.com/llvm/llvm-project/commit/4193a90b4263ff8c9599b921882cfbd7052b8571.diff LOG: Modify ObjectFileELF so it can load notes from PT_NOTE segments. (#160652) The ObjectFileELF parser was not able to load ELF notes from PT_NOTE program headers. This patch fixes ObjectFileELF::GetUUID() to check the program header and parse the notes in any PT_NOTE segments. This will allow memory ELF files to extract the UUID from an in memory image that has no section headers. Added a test that creates an ELF file, strips all section headers, and then makes sure that LLDB can see the UUID value. Added: lldb/test/Shell/ObjectFile/ELF/elf-no-shdrs-pt-notes.yaml Modified: lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.cpp Removed: ################################################################################ diff --git a/lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.cpp b/lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.cpp index 931baf5927a04..097c91b623e8f 100644 --- a/lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.cpp +++ b/lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.cpp @@ -826,6 +826,24 @@ bool ObjectFileELF::ParseHeader() { } UUID ObjectFileELF::GetUUID() { + if (m_uuid) + return m_uuid; + + // Try loading note info from any PT_NOTE program headers. This is more + // friendly to ELF files that have no section headers, like ELF files that + // are loaded from memory. + for (const ELFProgramHeader &H : ProgramHeaders()) { + if (H.p_type == llvm::ELF::PT_NOTE) { + DataExtractor note_data = GetSegmentData(H); + if (note_data.GetByteSize()) { + lldb_private::ArchSpec arch_spec; + RefineModuleDetailsFromNote(note_data, arch_spec, m_uuid); + if (m_uuid) + return m_uuid; + } + } + } + // Need to parse the section list to get the UUIDs, so make sure that's been // done. if (!ParseSectionHeaders() && GetType() != ObjectFile::eTypeCoreFile) diff --git a/lldb/test/Shell/ObjectFile/ELF/elf-no-shdrs-pt-notes.yaml b/lldb/test/Shell/ObjectFile/ELF/elf-no-shdrs-pt-notes.yaml new file mode 100644 index 0000000000000..62562f6c5f7bf --- /dev/null +++ b/lldb/test/Shell/ObjectFile/ELF/elf-no-shdrs-pt-notes.yaml @@ -0,0 +1,706 @@ +## This test verifies that loading an ELF file, that has no section headers but +## has a PT_NOTE program header with a GNU Build ID, can properly extract the +## UUID value. + +# RUN: yaml2obj %s -o %t +# RUN: llvm-strip --strip-sections %t + +# RUN: %lldb -b \ +# RUN: -o "target create -d '%t'" \ +# RUN: -o "image list" \ +# RUN: | FileCheck %s + +# CHECK: Current executable set to '{{.*/tools/lldb/test/Shell/ObjectFile/ELF/Output/elf-no-shdrs-pt-notes.yaml.tmp}}' (x86_64). +# CHECK: [ 0] 7F1F56D6-7DBB-17BA-C9A3-4417DB52F097-2548414F 0x0000000000000000 {{.*/tools/lldb/test/Shell/ObjectFile/ELF/Output/elf-no-shdrs-pt-notes.yaml.tmp}} + +--- !ELF +FileHeader: + Class: ELFCLASS64 + Data: ELFDATA2LSB + Type: ET_DYN + Machine: EM_X86_64 + Entry: 0x1040 +ProgramHeaders: + - 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