vmlinux-to-elf
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Published
20 hours ago •
marin-m
marin-m
4.9.65 vmlinux failed to process
I am trying to decompile Android device's stock ROM vmlinux and at first I wanted to use your script to improve decompilation quality. When I try to process vmlinux, I get 'ElfNullSection' object has no attribute 'symbol_table' exception.
After adding some code for debugging, I see that self.symtab_section (what is set to self.elf_file.sections[self.section_header.sh_link] value) is a ElfNullSection instead of ElfSection. That's all I got, I'm not good at Python, so I can't fix it by myself...
$ vmlinux-to-elf vmlinuxEng vmlinuxEng.elf
[+] Version string: Linux version 4.9.65+ (flyme@Mz-Builder-L23) (gcc version 4.9.x 20150123 (prerelease) (GCC) ) #1 SMP PREEMPT Wed Jul 25 17:45:44 CST 2018
[+] Guessed architecture: aarch64 successfully in 41.76 seconds
[+] Found relocations table at file offset 0x1dc38f0 (count=233684)
[+] Found kernel text candidate: 0xffffff8008080000
[+] Successfully applied 233684 relocations.
[+] Found kallsyms_token_table at file offset 0x01869e00
[+] Found kallsyms_token_index at file offset 0x0186a300
[+] Found kallsyms_markers at file offset 0x01868a00
[+] Found kallsyms_names at file offset 0x01699100
[+] Found kallsyms_num_syms at file offset 0x01699000
[i] Negative offsets overall: 0 %
[i] Null addresses overall: 0 %
[+] Found kallsyms_offsets at file offset 0x015ffffc
Traceback (most recent call last):
File "/usr/bin/vmlinux-to-elf", line 63, in <module>
ElfSymbolizer(
File "/usr/lib/python3.10/site-packages/vmlinux_to_elf/elf_symbolizer.py", line 49, in __init__
kernel = ElfFile.from_bytes(BytesIO(file_contents))
File "/usr/lib/python3.10/site-packages/vmlinux_to_elf/utils/elf.py", line 166, in from_bytes
obj.unserialize(data)
File "/usr/lib/python3.10/site-packages/vmlinux_to_elf/utils/elf.py", line 186, in unserialize
section.post_unserialize()
File "/usr/lib/python3.10/site-packages/vmlinux_to_elf/utils/elf.py", line 928, in post_unserialize
relocation.associated_symbol = self.symtab_section.symbol_table[relocation.r_info_sym]
AttributeError: 'ElfNullSection' object has no attribute 'symbol_table'
vmlinux section headers
There are 41 section headers, starting at offset 0x1182c880:
Section Headers:
[Nr] Name Type Address Offset
Size EntSize Flags Link Info Align
[ 0] NULL 0000000000000000 00000000
0000000000000000 0000000000000000 0 0 0
[ 1] .head.text PROGBITS ffffff8008080000 00010000
0000000000001000 0000000000000000 AX 0 0 4096
[ 2] .text PROGBITS ffffff8008081000 00011000
0000000001186e98 0000000000000008 AX 0 0 2048
[ 3] .rodata PROGBITS ffffff8009300000 01200000
0000000000945998 0000000000000000 WA 0 0 1048576
[ 4] .eh_frame PROGBITS ffffff8009c45998 01b45998
0000000000000048 0000000000000000 A 0 0 8
[ 5] __bug_table PROGBITS ffffff8009c459e0 01b459e0
0000000000019b00 0000000000000000 A 0 0 4
[ 6] .pci_fixup PROGBITS ffffff8009c5f4e0 01b5f4e0
0000000000002778 0000000000000000 A 0 0 8
[ 7] __ksymtab PROGBITS ffffff8009c61c58 01b61c58
00000000000197f0 0000000000000000 A 0 0 8
[ 8] __ksymtab_gpl PROGBITS ffffff8009c7b448 01b7b448
0000000000011390 0000000000000000 A 0 0 8
[ 9] __kcrctab PROGBITS ffffff8009c8c7d8 01b8c7d8
000000000000cbf8 0000000000000000 A 0 0 8
[10] __kcrctab_gpl PROGBITS ffffff8009c993d0 01b993d0
00000000000089c8 0000000000000000 A 0 0 8
[11] __ksymtab_strings PROGBITS ffffff8009ca1d98 01ba1d98
00000000000359dd 0000000000000000 A 0 0 1
[12] __param PROGBITS ffffff8009cd7778 01bd7778
0000000000004f38 0000000000000000 A 0 0 8
[13] __modver PROGBITS ffffff8009cdc6b0 01bdc6b0
0000000000000950 0000000000000000 A 0 0 8
[14] __ex_table PROGBITS ffffff8009cdd000 01bdd000
00000000000045c0 0000000000000000 A 0 0 8
[15] .notes NOTE ffffff8009ce15c0 01be15c0
0000000000000024 0000000000000000 A 0 0 4
[16] .init.text PROGBITS ffffff8009cf0000 01bf0000
000000000007d0d0 0000000000000000 AX 0 0 16
[17] .exit.text PROGBITS ffffff8009d6d0d0 01c6d0d0
000000000000702c 0000000000000000 AX 0 0 4
[18] .init.data PROGBITS ffffff8009d74100 01c74100
000000000011ecd8 0000000000000000 WA 0 0 256
[19] .data..percpu PROGBITS ffffff8009e93000 01d93000
000000000000d700 0000000000000000 WA 0 0 128
[20] .altinstructions PROGBITS ffffff8009ea0700 01da0700
000000000001a388 0000000000000000 A 0 0 1
[21] .altinstr_re[...] PROGBITS ffffff8009ebaa88 01dbaa88
0000000000008e68 0000000000000000 AX 0 0 4
[22] .rela RELA ffffff8009ec38f0 01dc38f0
0000000000559440 0000000000000018 A 0 0 8
[23] .data PROGBITS ffffff800a420000 02320000
000000000029cff0 0000000000000000 WA 0 0 4096
[24] .got.plt PROGBITS ffffff800a6bcff0 025bcff0
0000000000000018 0000000000000008 WA 0 0 8
[25] .mmuoff.data[...] PROGBITS ffffff800a6bd800 025bd800
0000000000000020 0000000000000000 WA 0 0 2048
[26] .mmuoff.data.read PROGBITS ffffff800a6be000 025be000
0000000000000008 0000000000000000 WA 0 0 8
[27] .pecoff_edat[...] PROGBITS ffffff800a6be008 025be008
00000000000001f8 0000000000000000 WA 0 0 1
[28] .bss NOBITS ffffff800a6bf000 025be200
0000000000c5c3b0 0000000000000000 WA 0 0 4096
[29] .comment PROGBITS 0000000000000000 025be200
0000000000000027 0000000000000001 MS 0 0 1
[30] .debug_line PROGBITS 0000000000000000 025be227
0000000000e485e8 0000000000000000 0 0 1
[31] .debug_info PROGBITS 0000000000000000 0340680f
000000000b3bd589 0000000000000000 0 0 1
[32] .debug_abbrev PROGBITS 0000000000000000 0e7c3d98
000000000042e290 0000000000000000 0 0 1
[33] .debug_aranges PROGBITS 0000000000000000 0ebf2030
000000000002f260 0000000000000000 0 0 16
[34] .debug_ranges PROGBITS 0000000000000000 0ec21290
000000000088b6b0 0000000000000000 0 0 16
[35] .debug_frame PROGBITS 0000000000000000 0f4ac940
000000000035d960 0000000000000000 0 0 8
[36] .debug_str PROGBITS 0000000000000000 0f80a2a0
00000000004a8d97 0000000000000001 MS 0 0 1
[37] .debug_loc PROGBITS 0000000000000000 0fcb3037
0000000001307590 0000000000000000 0 0 1
[38] .shstrtab STRTAB 0000000000000000 10fba5c7
00000000000001c8 0000000000000000 0 0 1
[39] .symtab SYMTAB 0000000000000000 10fba790
00000000004f1f58 0000000000000018 40 177998 8
[40] .strtab STRTAB 0000000000000000 114ac6e8
0000000000380193 0000000000000000 0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
L (link order), O (extra OS processing required), G (group), T (TLS),
C (compressed), x (unknown), o (OS specific), E (exclude),
D (mbind), p (processor specific)