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Pyelftools: 获取像 objdump 那样的 elf32 小武器二进制的区旗
原标题:pyelftools: retrieve section flags like objdump does for an elf32-littlearm binary
I need to identify all ELF sections that have the LOAD flag in my python script; using objdump, I receive $ arm-none-eabi-objdump -h test.elf test.elf: file format elf32-littlearm Sections: Idx Name Size VMA LMA File off Algn 0 .text 00014480 00000000 00000000 00008000 2**2 CONTENTS, ALLOC, LOAD, READONLY, CODE 1 .relocate 00000090 20000000 00014480 00020000 2**2 CONTENTS, ALLOC, LOAD, DATA 2 .bss 000016ec 20000090 00014510 00020090 2**4 ALLOC 3 .stack 00002004 2000177c 00014510 0002177c 2**0 ALLOC 4 TOUCH_SAFETY_DATA_LOCATION 00000704 20004000 00014510 00024000 2**3 CONTENTS, ALLOC, LOAD, DATA 5 FMEA_SAFETY_DATA_LOCATION 00000070 20007c00 00014c14 00027c00 2**2 CONTENTS, ALLOC, LOAD, DATA ... (some 10 or so more sections) However, with the Python3 elftools module, from the following sources: from elftools.elf.elffile import ELFFile for section in ELFFile(open("test.elf", "rb")).iter_sections(): print("{0:30s} 0b{1:08b}".format(section.name, section.header.sh_flags)) I receive completely different flags: 0b00000000 .text 0b00000110 .relocate 0b00000011 .bss 0b00000011 .stack 0b00000011 TOUCH_SAFETY_DATA_LOCATION 0b00000011 FMEA_SAFETY_DATA_LOCATION 0b00000011 ... (some 10 or so more sections) From the objdump sources (I wasn t able to locate any documentation on the issue), the LOAD flag should have the value 0x02 (0b00000010). It seems like the flags that are reported by pyelftools are entirely independent of those that are reported by objdump (presumably the correct ones). What am I doing wrong?
最佳回答
Actually they both agree. As Notlikethat already pointed out, the ELF spec points 0x1 (0b00000001) to be SHF_WRITE, so all the sections but .text are marked writable. Since objdump is not ELF specific (like readelf would be), the flags don t match 1:1, and instead it reports READONLY when 0x01 is missing.
问题回答
The issue here is that objdump is not getting the LOAD identifier from the sh_flags but instead from sh_type. If you look at section.header.sh_type you will see either SHT_PROGBITS or SHT_NOBITS to indicate if it is a loadable section or not.




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