objdump cant parse valid elf file "dream", which is available herehttp://www.stripedgazelle.org/cgi-bin/wiki_joey/dream20101104.tar.gz objdump: file is not valid elf file but readelf succesfully do this: ELF 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: 0x8048e28 Start of program headers: 52 (bytes into file) Start of section headers: 180 (bytes into file) Flags: 0x0 Size of this header: 52 (bytes) Size of program headers: 32 (bytes) Number of program headers: 4 Size of section headers: 40 (bytes) Number of section headers: 0 (0) Section header string table index: 0 There are no sections in this file. There are no sections in this file. Program Headers: Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align INTERP 0x0001d6 0x080481d6 0x00000000 0x00013 0x00013 R 0x1000 [Requesting program interpreter: /lib/ld-linux.so.2] DYNAMIC 0x0000fc 0x080480fc 0x00000000 0x00048 0x00048 RW 0x1000 LOAD 0x000000 0x08048000 0x00000000 0x07a8b 0x07a8b R E 0x1000 LOAD 0x007a8b 0x0804fa8b 0x00000000 0x01ef5 0x1f7e5a1 RWE 0x1000 Dynamic section at offset 0xfc contains 9 entries: Tag Type Name/Value 0x00000001 (NEEDED) Shared library: [libdl.so.2] 0x00000004 (HASH) 0x80480dc 0x00000005 (STRTAB) 0x80481ac 0x00000006 (SYMTAB) 0x8048144 0x0000000a (STRSZ) 42 (bytes) 0x0000000b (SYMENT) 16 (bytes) 0x00000011 (REL) 0x8048194 0x00000012 (RELSZ) 24 (bytes) 0x00000013 (RELENT) 8 (bytes) There are no relocations in this file. There are no unwind sections in this file. Histogram for bucket list length (total of 1 buckets): Length Number % of total Coverage 0 1 (100.0%) No version information found in this file. Also scanelf write something: TYPE PAX PERM ENDIAN STK/REL/PTL TEXTREL RPATH BIND FILE ET_EXEC PeMRxS 0755 LE --- --- RWX - - LAZY dream P.S. This bug was created from understanding another bug with paxctl from grsecurity from gentoo: https://bugs.gentoo.org/show_bug.cgi?id=353731 . difference between paxctl (dont recognize "dream" ) and chpax (recignize "dream") Also I'm attach patch, that fix this.
Created attachment 261597 [details, diff] Fix section table in elf.scm file
It's not clear to me that the bug is in the file and not in objdump.
See ELF format specification - if we dont use section headers - we dont need this section in the elf header, and offset to this section also must be zero. So this is bug of dream.
see also this bug - now objdump report about such things: http://sourceware.org/bugzilla/show_bug.cgi?id=12467
Patch already in the lisp overlay tree/ebuild
