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Objdump shows different symbols when disassembling and just printing symbols

What do +,- and ? symbols represent in `service --status-all`LinuxMint “File System” shows no space when many GB existldd shows library exists and is linked, program doesn't find itldd returns “not a dynamic executable” for a 64-bit ELF, even though objdump and readelf disagreeWhy nm shows no symbols for /lib/i386-linux-gnu/libc.so.6?id and whoami commands shows different userjust grep multiple pattern on different rowWhy (and how) do I have (seemingly!) duplicate symbols in my shared libraries?

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{
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}

0

Ubuntu 18.04

I have a simple ELF64 binary compiled from a C source file and linked with a shared object. I tried to examine it with objdump and got the following confusion:

$ objdump -d -j .plt bin



bin:     file format elf64-x86-64





Disassembly of section .plt:



00000000000006a0 <.plt>:

 6a0:   ff 35 62 09 20 00       pushq  0x200962(%rip)        # 201008 <_GLOBAL_OFFSET_TABLE_+0x8>

 6a6:   ff 25 64 09 20 00       jmpq   *0x200964(%rip)        # 201010 <_GLOBAL_OFFSET_TABLE_+0x10>

 6ac:   0f 1f 40 00             nopl   0x0(%rax)



00000000000006b0 <foo@plt>:

 6b0:   ff 25 62 09 20 00       jmpq   *0x200962(%rip)        # 201018 <foo>

 6b6:   68 00 00 00 00          pushq  $0x0

 6bb:   e9 e0 ff ff ff          jmpq   6a0 <.plt>



00000000000006c0 <dlopen@plt>:

 6c0:   ff 25 5a 09 20 00       jmpq   *0x20095a(%rip)        # 201020 <dlopen@GLIBC_2.2.5>

 6c6:   68 01 00 00 00          pushq  $0x1

 6cb:   e9 d0 ff ff ff          jmpq   6a0 <.plt>



00000000000006d0 <__printf_chk@plt>:

 6d0:   ff 25 52 09 20 00       jmpq   *0x200952(%rip)        # 201028 <__printf_chk@GLIBC_2.3.4>

 6d6:   68 02 00 00 00          pushq  $0x2

 6db:   e9 c0 ff ff ff          jmpq   6a0 <.plt>

But when just printing symbols from a plt section I got no output:

$ objdump -t -j .plt bin



bin:     file format elf64-x86-64



SYMBOL TABLE:

00000000000006a0 l    d  .plt   0000000000000000              .plt

Why was not the symbols from the plt section printed when objdump -t as they were when disassembling?

linux ubuntu dynamic-linking

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asked 7 mins ago

St.AntarioSt.Antario

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 | 

0

Ubuntu 18.04

I have a simple ELF64 binary compiled from a C source file and linked with a shared object. I tried to examine it with objdump and got the following confusion:

$ objdump -d -j .plt bin



bin:     file format elf64-x86-64





Disassembly of section .plt:



00000000000006a0 <.plt>:

 6a0:   ff 35 62 09 20 00       pushq  0x200962(%rip)        # 201008 <_GLOBAL_OFFSET_TABLE_+0x8>

 6a6:   ff 25 64 09 20 00       jmpq   *0x200964(%rip)        # 201010 <_GLOBAL_OFFSET_TABLE_+0x10>

 6ac:   0f 1f 40 00             nopl   0x0(%rax)



00000000000006b0 <foo@plt>:

 6b0:   ff 25 62 09 20 00       jmpq   *0x200962(%rip)        # 201018 <foo>

 6b6:   68 00 00 00 00          pushq  $0x0

 6bb:   e9 e0 ff ff ff          jmpq   6a0 <.plt>



00000000000006c0 <dlopen@plt>:

 6c0:   ff 25 5a 09 20 00       jmpq   *0x20095a(%rip)        # 201020 <dlopen@GLIBC_2.2.5>

 6c6:   68 01 00 00 00          pushq  $0x1

 6cb:   e9 d0 ff ff ff          jmpq   6a0 <.plt>



00000000000006d0 <__printf_chk@plt>:

 6d0:   ff 25 52 09 20 00       jmpq   *0x200952(%rip)        # 201028 <__printf_chk@GLIBC_2.3.4>

 6d6:   68 02 00 00 00          pushq  $0x2

 6db:   e9 c0 ff ff ff          jmpq   6a0 <.plt>

But when just printing symbols from a plt section I got no output:

$ objdump -t -j .plt bin



bin:     file format elf64-x86-64



SYMBOL TABLE:

00000000000006a0 l    d  .plt   0000000000000000              .plt

Why was not the symbols from the plt section printed when objdump -t as they were when disassembling?

linux ubuntu dynamic-linking

share

asked 7 mins ago

St.AntarioSt.Antario

17111 silver badge1212 bronze badges

add a comment
 | 

Ubuntu 18.04

I have a simple ELF64 binary compiled from a C source file and linked with a shared object. I tried to examine it with objdump and got the following confusion:

$ objdump -d -j .plt bin



bin:     file format elf64-x86-64





Disassembly of section .plt:



00000000000006a0 <.plt>:

 6a0:   ff 35 62 09 20 00       pushq  0x200962(%rip)        # 201008 <_GLOBAL_OFFSET_TABLE_+0x8>

 6a6:   ff 25 64 09 20 00       jmpq   *0x200964(%rip)        # 201010 <_GLOBAL_OFFSET_TABLE_+0x10>

 6ac:   0f 1f 40 00             nopl   0x0(%rax)



00000000000006b0 <foo@plt>:

 6b0:   ff 25 62 09 20 00       jmpq   *0x200962(%rip)        # 201018 <foo>

 6b6:   68 00 00 00 00          pushq  $0x0

 6bb:   e9 e0 ff ff ff          jmpq   6a0 <.plt>



00000000000006c0 <dlopen@plt>:

 6c0:   ff 25 5a 09 20 00       jmpq   *0x20095a(%rip)        # 201020 <dlopen@GLIBC_2.2.5>

 6c6:   68 01 00 00 00          pushq  $0x1

 6cb:   e9 d0 ff ff ff          jmpq   6a0 <.plt>



00000000000006d0 <__printf_chk@plt>:

 6d0:   ff 25 52 09 20 00       jmpq   *0x200952(%rip)        # 201028 <__printf_chk@GLIBC_2.3.4>

 6d6:   68 02 00 00 00          pushq  $0x2

 6db:   e9 c0 ff ff ff          jmpq   6a0 <.plt>

But when just printing symbols from a plt section I got no output:

$ objdump -t -j .plt bin



bin:     file format elf64-x86-64



SYMBOL TABLE:

00000000000006a0 l    d  .plt   0000000000000000              .plt

Why was not the symbols from the plt section printed when objdump -t as they were when disassembling?

linux ubuntu dynamic-linking

share

asked 7 mins ago

St.AntarioSt.Antario

17111 silver badge1212 bronze badges

$ objdump -d -j .plt bin



bin:     file format elf64-x86-64





Disassembly of section .plt:



00000000000006a0 <.plt>:

 6a0:   ff 35 62 09 20 00       pushq  0x200962(%rip)        # 201008 <_GLOBAL_OFFSET_TABLE_+0x8>

 6a6:   ff 25 64 09 20 00       jmpq   *0x200964(%rip)        # 201010 <_GLOBAL_OFFSET_TABLE_+0x10>

 6ac:   0f 1f 40 00             nopl   0x0(%rax)



00000000000006b0 <foo@plt>:

 6b0:   ff 25 62 09 20 00       jmpq   *0x200962(%rip)        # 201018 <foo>

 6b6:   68 00 00 00 00          pushq  $0x0

 6bb:   e9 e0 ff ff ff          jmpq   6a0 <.plt>



00000000000006c0 <dlopen@plt>:

 6c0:   ff 25 5a 09 20 00       jmpq   *0x20095a(%rip)        # 201020 <dlopen@GLIBC_2.2.5>

 6c6:   68 01 00 00 00          pushq  $0x1

 6cb:   e9 d0 ff ff ff          jmpq   6a0 <.plt>



00000000000006d0 <__printf_chk@plt>:

 6d0:   ff 25 52 09 20 00       jmpq   *0x200952(%rip)        # 201028 <__printf_chk@GLIBC_2.3.4>

 6d6:   68 02 00 00 00          pushq  $0x2

 6db:   e9 c0 ff ff ff          jmpq   6a0 <.plt>

$ objdump -t -j .plt bin



bin:     file format elf64-x86-64



SYMBOL TABLE:

00000000000006a0 l    d  .plt   0000000000000000              .plt

share

asked 7 mins ago

St.AntarioSt.Antario

17111 silver badge1212 bronze badges

share

asked 7 mins ago

St.AntarioSt.Antario

17111 silver badge1212 bronze badges

asked 7 mins ago

St.AntarioSt.Antario

17111 silver badge1212 bronze badges

asked 7 mins ago

St.AntarioSt.Antario

17111 silver badge1212 bronze badges