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ELF loading should not use the file offset for loading the dynamic section

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This commit is contained in:
LukeFZ
2025-03-01 05:45:25 +01:00
parent fe56b2fe2f
commit 404265bd1e
1 changed files with 16 additions and 2 deletions
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18
Il2CppInspector.Common/FileFormatStreams/ElfReader.cs
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@@ -223,7 +223,20 @@ namespace Il2CppInspector
// Get dynamic table if it exists (must be done after rebasing) // Get dynamic table if it exists (must be done after rebasing)
if (GetProgramHeader(Elf.PT_DYNAMIC) is TPHdr PT_DYNAMIC) if (GetProgramHeader(Elf.PT_DYNAMIC) is TPHdr PT_DYNAMIC)
DynamicTable = ReadArray<elf_dynamic<TWord>>(conv.Long(PT_DYNAMIC.p_offset), (int) (conv.Long(PT_DYNAMIC.p_filesz) / Sizeof(typeof(elf_dynamic<TWord>)))); {
// Important: do not use p_offset here!
// Only load sections should be loaded, which should also include the memory region that contains the dynamic section.
// This just provides the virtual address of the section.
// Some binaries may use the offset here to point to a fake version of the dynamic section,
// making relocation resolution and subsequent analysis fail.
// Reference for Android:
// phdr_table_get_dynamic_section, https://cs.android.com/android/platform/superproject/main/+/main:bionic/linker/linker_phdr.cpp
var dynamicAddr = conv.ULong(PT_DYNAMIC.p_vaddr);
var dynamicSize = (int)(conv.Long(PT_DYNAMIC.p_filesz) / Sizeof(typeof(elf_dynamic<TWord>)));
DynamicTable = ReadMappedArray<elf_dynamic<TWord>>(dynamicAddr, dynamicSize);
}
// Get offset of code section // Get offset of code section
var codeSegment = PHT.First(x => ((Elf) x.p_flags & Elf.PF_X) == Elf.PF_X); var codeSegment = PHT.First(x => ((Elf) x.p_flags & Elf.PF_X) == Elf.PF_X);
@@ -388,7 +401,8 @@ namespace Il2CppInspector
WriteArray(conv.Long(PT_DYNAMIC.p_offset), dt); WriteArray(conv.Long(PT_DYNAMIC.p_offset), dt);
} }
private void processSymbols() { private void processSymbols()
{
StatusUpdate("Processing symbols"); StatusUpdate("Processing symbols");
// Three possible symbol tables in ELF files // Three possible symbol tables in ELF files