[Nix-dev] patchelf on statically linked executables

[Eelco Dolstra]

Hi,

On 11/12/12 15:06, Mathijs Kwik wrote:

> I'm trying to patch a statically linked executable, but run into an error.
> 
> $ file bin/phantomjs
> bin/phantomjs: ELF 64-bit LSB executable, x86-64, version 1
> (GNU/Linux), statically linked, stripped
> 
> $ strace bin/phantomjs
> execve("bin/phantomjs", ["bin/phantomjs"], [/* 75 vars */]) = 0
> mmap(0x24f7000, 34440656, PROT_READ|PROT_WRITE|PROT_EXEC,
> MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, 0, 0) = 0x24f7000
> readlink("/proc/self/exe", "/home/mathijs/Downloads/phantomj"..., 4096) = 66
> mmap(0x400000, 34566144, PROT_NONE,
> MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x400000
> mmap(0x400000, 32413904, PROT_READ|PROT_WRITE|PROT_EXEC,
> MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x400000
> mprotect(0x400000, 32413904, PROT_READ|PROT_EXEC) = 0
> mmap(0x22ea000, 1957120, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0x1eea000) = 0x22ea000
> mprotect(0x22ea000, 1957120, PROT_READ|PROT_WRITE) = 0
> mmap(0x24c8000, 191672, PROT_READ|PROT_WRITE,
> MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x24c8000
> open("/lib64/ld-linux-x86-64.so.2", O_RDONLY) = -1 ENOENT (No such
> file or directory)

Eh.  It's using ld-linux-x86-64.so.2, which is rather strange for a supposedly
statically linked program.  Maybe you can put the output of "readelf -a" somewhere?

> patchelf: patchelf.cc:289: void ElfFile<Elf_Ehdr, Elf_Phdr, Elf_Shdr,
> Elf_Addr, Elf_Off, Elf_Dyn, Elf_Sym>::parse() [with Elf_Ehdr =
> Elf64_Ehdr, Elf_Phdr = Elf64_Phdr, Elf_Shdr = Elf64_Shdr, Elf_Addr =
> long unsigned int, Elf_Off = long unsigned int, Elf_Dyn = Elf64_Dyn,
> Elf_Sym = Elf64_Sym]: Assertion `shstrtabIndex < shdrs.size()' failed.

This does suggest a broken binary since the e_shstrndx header field refers to a
non-existent section (that's "Section header string table index" in the readelf
output BTW).

-- 
-- 
Eelco Dolstra | LogicBlox, Inc. | http://nixos.org/~eelco/