[ELF] stringtable ist kein stringtable?

[ness]

Ich versuche grad ein bisschen mit "ELF-magie" rumzuspielen. Klappt aber nicht so richtg. Hier erst mal mein linker-\1:(woanders geklaut)

OUTPUT_FORMAT("elf64-x86-64", "elf64-x86-64",
	      "elf64-x86-64")
OUTPUT_ARCH(i386:x86-64)

page_size = 0x1000;

TARGET("binary")

PHDRS
{
  headers PT_PHDR FILEHDR PHDRS;
  file_list PT_LOAD;
}

INPUT("driver")

SECTIONS
{
  . = SIZEOF_HEADERS;

  drv ALIGN(page_size): { "driver" }

  foo ALIGN(page_size): { BYTE(1) } : file_list
}

Mein proggie:

#include <stdio.h>
#include <assert.h>
#include <string.h>

#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>

#include <elf.h>

int main(int argc,char** argv)
{
	assert(argc == 2);
	int fd=open(argv[1],O_RDONLY);
	assert(fd!=-1);
	caddr_t addr=mmap(0,15000,PROT_READ,MAP_SHARED,fd,0);

	Elf64_Ehdr* elf=(Elf64_Ehdr*)addr;

	assert(			elf->e_ident[EI_MAG0]==ELFMAG0
				&&	elf->e_ident[EI_MAG1]==ELFMAG1
				&&	elf->e_ident[EI_MAG2]==ELFMAG2
				&&	elf->e_ident[EI_MAG3]==ELFMAG3);

	printf("ist ELF-Datei\n");

	assert(elf->e_shstrndx!=SHN_UNDEF&&elf->e_shstrndx<elf->e_shnum);

	printf("%i sections, %i ist der string table\n",elf->e_shnum, elf->e_shstrndx);

	Elf64_Shdr* strtable=(Elf64_Shdr*)(addr + elf->e_shoff + elf->e_shstrndx * elf->e_shentsize);

	assert(strtable->sh_type == SHT_STRTAB);
	assert(strtable->sh_size != 0);

	printf("\n");

	Elf64_Shdr* tmpsh;
	unsigned i;
	for(i=1;i<elf->e_shnum;++i)
	{
		tmpsh=(Elf64_Shdr*)(addr + elf->e_shoff+ i * elf->e_shentsize);
		//if(!strcmp((char*)(addr+strtable->sh_offset)+tmpsh->sh_name,"drv"))
			printf("%s\t%i\n",(char*)(addr+strtable->sh_offset)+tmpsh->sh_name,tmpsh->sh_addr);
	};

	/*printf("\n");

	unsigned j;
	Elf64_Phdr* tmpph;
	for (j = 0; j < elf->e_phnum; j++)
	{
		tmpph = (Elf64_Phdr *) (addr + elf->e_phoff + j * elf->e_phentsize);
		printf("%i",tmpph->p_vaddr);
		for(i=1;i<elf->e_shnum;++i)
		{
			tmpsh=(Elf64_Shdr*)(addr + elf->e_shoff+ i * elf->e_shentsize);
			if(tmpsh->sh_addr==tmpph->p_vaddr)
			{
				printf("\t%s",(char*)(addr+strtable->sh_offset)+tmpsh->sh_name);
				break;
			};
		};
		printf("\n");
	}*/

	close(fd);
	return 0;
};

Das Programm beendet mit

read: read.c:34: main: Assertion `strtable->sh_type == 3' failed.

Wenn ich im ldscript die section foo weglasse, funktioniert das, aber ich bekomme (von ld) die warnung

ld: drv: warning: allocated section `drv' not in segment

Und: readelf liest programme, die mit dem 1. script erzeugt wurden, ohne zu murren.
Irgendwie hab ich das gefühl, irgendwo in meinem code liegt der fehler ...