Re: Potential bug in fs/binfmt_elf.c?

[ebiederm@xmission.com (Eric W. Biederman)]

Mike Hearn <mike@navi.cx> writes:

> On Sat, 2004-03-06 at 18:46, Ulrich Drepper wrote:
> > Show an example of what the file looks like.  Just the ELF program
> > header (readelf -l output).
> 
> I can send the linker script and source file on request. They are
> probably a bit buggy, this isn't an area I know much about. The binutils
> guys seemed to think it should work however.
> 
> thanks -mike
> 
> 
> Elf file type is EXEC (Executable file)
> Entry point 0x818
> There are 6 program headers, starting at offset 52
>  
> Program Headers:
>   Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
>   PHDR           0x000034 0x00000034 0x00000034 0x000c0 0x000c0 R   0x4
>   INTERP         0x000400 0x00000400 0x00000400 0x00034 0x00034 R   0x4
>       [Requesting program interpreter: /lib/ld-linux.so.2]
>   LOAD           0x000000 0x00000000 0x00000000 0x00bc4 0x00bc4 R E 0x1000
>   LOAD           0x000bc4 0x00000bc4 0x00000bc4 0x00150 0x00154 RW  0x1000
>   DYNAMIC        0x000bd0 0x00000bd0 0x00000bd0 0x00108 0x00108 RW  0x4
>   LOAD           0x001000 0x00400000 0x00400000 0x00000 0x10000000 R   0x1000

That last PT_LOAD segment looks like pure nonsense.  What is the purpose
of allocating 256MB of read-only zeros?

Eric