如何找到未满足的ELF依赖项？

Question

我使用LSB SDK构建了一个测试ELF程序(注意我的问题不是LSB特有的):

$ /opt/lsb/bin/lsbcc tst.c
$ ls -l a.out 
-rwxr-xr-x 1 math math 10791 2009-10-13 20:13 a.out
$ file a.out 
a.out: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.15, not stripped

但我无法启动它(是的,我向你保证,该文件是在目录...):

$ ./a.out 
bash: ./a.out: No such file or directory

$ uname -a
Linux math 2.6.28-15-generic #52-Ubuntu SMP Wed Sep 9 10:48:52 UTC 2009 x86_64 GNU/Linux

我认为有一个ELF依赖不能实现,但我不知道如何找到它.是否有一个类似于ldd的工具库可用于找到缺失的链接？

我不认为它与2.6.15/2.6.28-15的区别有关,因为LSB编译器正在工作:

$ file /opt/lsb/bin/lsbcc 
/opt/lsb/bin/lsbcc: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.4, not stripped

以防万一,这是a.out的ELF动态部分:

 0x0000000000000001 (NEEDED)             Shared library: [libpthread.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libm.so.6]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so.6]
 0x000000000000000c (INIT)               0x400428
 0x000000000000000d (FINI)               0x400638
 0x0000000000000004 (HASH)               0x400278
 0x0000000000000005 (STRTAB)             0x400350
 0x0000000000000006 (SYMTAB)             0x4002a8
 0x000000000000000a (STRSZ)              121 (bytes)
 0x000000000000000b (SYMENT)             24 (bytes)
 0x0000000000000015 (DEBUG)              0x0
 0x0000000000000003 (PLTGOT)             0x600fe8
 0x0000000000000002 (PLTRELSZ)           24 (bytes)
 0x0000000000000014 (PLTREL)             RELA
 0x0000000000000017 (JMPREL)             0x400410
 0x0000000000000007 (RELA)               0x4003f8
 0x0000000000000008 (RELASZ)             24 (bytes)
 0x0000000000000009 (RELAENT)            24 (bytes)
 0x000000006ffffffe (VERNEED)            0x4003d8
 0x000000006fffffff (VERNEEDNUM)         1
 0x000000006ffffff0 (VERSYM)             0x4003ca
 0x0000000000000000 (NULL)               0x0

Answer 1

这看起来就像缺少ELF解释器时会发生什么.

确保存在/lib/ld-lsb.so.2(或类似;因LSB版本和体系结构而异). ldd并且readelf -l将能够显示您的可执行文件正在请求的ELF解释器.

(lsbcc(或LSB工具链中的某些东西)覆盖了系统的默认值/lib/ld-linux.so.2,可能是通过传递-Wl,--dynamic-linker=/lib/ld-lsb.so.2给编译器,原因我觉得相当愚蠢(Glibc总是提供相当优秀的向后兼容性),但是你有它.)