例如,x86体系结构的程序基于链接器的0x8048000.使用readelf我可以看到程序入口点,但输出中没有特定字段告诉基地址.
$readelf -e testELF header: Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00 Class: ELF32 Data: 2's complement,little endian Version: 1 (current) OS/ABI: UNIX - System V ABI Version: 0 Type: EXEC (Executable file) Machine: Intel 80386 Version: 0x1 Entry point address: 0x8048390 Start of program headers: 52 (bytes into file) Start of section headers: 4436 (bytes into file) Flags: 0x0 Size of this header: 52 (bytes) Size of program headers: 32 (bytes) Number of program headers: 9 Size of section headers: 40 (bytes) Number of section headers: 30Section headers: [Nr] name Type Addr Off Size ES Flg Lk Inf Al [ 0] NulL 00000000 000000 000000 00 0 0 0 [ 1] .interp PROGBITS 08048154 000154 000013 00 A 0 0 1 [ 2] .note.ABI-tag NOTE 08048168 000168 000020 00 A 0 0 4 [ 3] .note.gnu.build-i NOTE 08048188 000188 000024 00 A 0 0 4 [ 4] .gnu.hash GNU_HASH 080481ac 0001ac 000024 04 A 5 0 4 [ 5] .dynsym DYNSYM 080481d0 0001d0 000070 10 A 6 1 4
在部分细节中,我可以看到Offset是根据ELF的基地址计算的.
因此,.dynsym部分从地址0x080481d0开始,偏移量为0x1d0.这意味着基地址为0x08048000.它是否正确?
同样,对于在PPC,ARM,MIPS等不同架构上编译的程序,我看不到它们的基址,只能看到OEP,Section headers.
解决方法 您需要检查段表和程序头(readelf -l).Elf file type is EXEC (Executable file)Entry point 0x804a7a0There are 9 program headers,starting at offset 52Program headers: Type Offset VirtAddr PhysAddr fileSiz MemSiz Flg Align PHDR 0x000034 0x08048034 0x08048034 0x00120 0x00120 R E 0x4 INTERP 0x000154 0x08048154 0x08048154 0x00013 0x00013 R 0x1 [Requesting program interpreter: /lib/ld-linux.so.2] LOAD 0x000000 0x08048000 0x08048000 0x10fc8 0x10fc8 R E 0x1000 LOAD 0x011000 0x08059000 0x08059000 0x0038c 0x01700 RW 0x1000 DYNAMIC 0x01102c 0x0805902c 0x0805902c 0x000f8 0x000f8 RW 0x4 NOTE 0x000168 0x08048168 0x08048168 0x00020 0x00020 R 0x4 TLS 0x011000 0x08059000 0x08059000 0x00000 0x0005c R 0x4 GNU_EH_FRAME 0x00d3c0 0x080553c0 0x080553c0 0x00c5c 0x00c5c R 0x4 GNU_STACK 0x000000 0x00000000 0x00000000 0x00000 0x00000 RW 0x4
第一个(最低)LOAD段的虚拟地址是文件的默认加载基础.你可以看到这个文件是0x08048000.
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