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Fix shared object start address without program header #7052

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Merged
fuzyll merged 1 commit into from
Jul 29, 2025
Merged

Fix shared object start address without program header #7052

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27 changes: 18 additions & 9 deletions view/elf/elfview.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -474,7 +474,7 @@ bool ElfView::Init()
{
if (settings->Contains("loader.imageBase"))
preferredImageBase = settings->Get<uint64_t>("loader.imageBase", this);

if (settings->Contains("loader.platform"))
{
BNSettingsScope scope = SettingsAutoScope;
Expand Down Expand Up @@ -658,11 +658,10 @@ bool ElfView::Init()
semantics = ReadOnlyDataSectionSemantics;
else if ((m_elfSections[i].flags & ELF_SHF_WRITE) || In(sectionNames[i], readWriteDataSectionNames))
semantics = ReadWriteDataSectionSemantics;

if (m_elfSections[i].size != 0)
{
if (m_programHeaders.size() == 0)
{
{
// We have an object file so we'll just create segments for the sections
uint32_t flags = 0;
if (semantics == ReadOnlyCodeSectionSemantics)
Expand All @@ -671,11 +670,22 @@ bool ElfView::Init()
flags = SegmentReadable | SegmentWritable;
else if (semantics == ReadOnlyDataSectionSemantics)
flags = SegmentReadable;
m_elfSections[i].address = segmentStart;
size_t size = m_elfSections[i].type == ELF_SHT_NOBITS ? 0 : m_elfSections[i].size;
uint64_t adjustedSectionAddr = m_elfSections[i].address + imageBaseAdjustment;
AddAutoSegment(adjustedSectionAddr, m_elfSections[i].size, m_elfSections[i].offset, size, flags);
segmentStart += ((m_elfSections[i].size + 15) & ~15);
if ((m_commonHeader.type == ET_DYN) && (!m_parseOnly))
{
// We have a shared object file without program headers so we'll create segments for the sections
// based on the section address.
size_t size = m_elfSections[i].type == ELF_SHT_NOBITS ? 0 : m_elfSections[i].size;
uint64_t adjustedSectionAddr = m_elfSections[i].address + imageBaseAdjustment;
AddAutoSegment(adjustedSectionAddr, m_elfSections[i].size, m_elfSections[i].offset, size, flags);
}
else
{
m_elfSections[i].address = segmentStart;
size_t size = m_elfSections[i].type == ELF_SHT_NOBITS ? 0 : m_elfSections[i].size;
uint64_t adjustedSectionAddr = m_elfSections[i].address + imageBaseAdjustment;
AddAutoSegment(adjustedSectionAddr, m_elfSections[i].size, m_elfSections[i].offset, size, flags);
segmentStart += ((m_elfSections[i].size + 15) & ~15);
}
}
else if ((m_elfSections[i].address + m_elfSections[i].size + imageBaseAdjustment) > GetEnd() || ((m_elfSections[i].address + imageBaseAdjustment) < GetStart()))
{
Expand All @@ -690,7 +700,6 @@ bool ElfView::Init()
GetParentView()->AddAutoSection(sectionNames[i], m_elfSections[i].offset, m_elfSections[i].size, DefaultSectionSemantics, type, m_elfSections[i].align, m_elfSections[i].entrySize, linkedSection, infoSection, m_elfSections[i].info);
}
}

// Apply architecture and platform
if (!m_arch)
{
Expand Down
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