RE: jump to boot code

[Gin]

This is the header of my payload Filo.elf. it does have the starting
address.

=================================================
start address 0x001092e4

Program Header:
    LOAD off    0x000000a0 vaddr 0x00100000 paddr 0x00100000 align 2**5
         filesz 0x0000d048 memsz 0x000270d0 flags rwx
    LOAD off    0x0000d100 vaddr 0x001270e0 paddr 0x001270e0 align 2**5
         filesz 0x00000048 memsz 0x00000048 flags rw-
    NOTE off    0x000000c0 vaddr 0x00100020 paddr 0x00100020 align 2**5
         filesz 0x00000088 memsz 0x00000088 flags r--
======================================================

-----Original Message-----
From: [e-mail]
[mailto:[e-mail]] On Behalf Of Greg Watson
Sent: Thursday, December 02, 2004 10:57 PM
To: Gin
Cc: 'LinuxBIOS'
Subject: Re: jump to boot code

If you do an 'objdump -f' on the executable, what does it say is the 
start address? 0x1092e4 seems a bit strange.

Greg

On Dec 1, 2004, at 11:17 PM, Gin wrote:
> I tested my payload(FILO.elf) with linux loader Grub. It has no 
> problem at all. So something must go wrong when linuxbios jumps to the
> payload. FILO doesn't seem to run at all. No debug message over the 
> console.
>
> Don’t’ know if there is anyone familiar with ELF.
>
> This is the message over the console at the end.
>
> It seems that there are 2 segments in the ELF. In the end, linuxbios 
> jumps to an entry that looks like the in the middle of the first 
> segment.
>
> Does it look right?
>
> ============================================================
>
> Found ELF candiate at offset 0
>
> (cleaned up) New segment addr 0x100000 size 0x270f0 offset 0xa0 
> filesize 0xd068
>
> (cleaned up) New segment addr 0x127100 size 0x48 offset 0xd120 
> filesize 0x48
>
> Dropping non PT_LOAD segment
>
> Loading Segment: addr: 0x0000000000100000 memsz: 0x00000000000270f0 
> filesz: 0x00 0000000000d068
>
> Loading Segment: addr: 0x0000000000127100 memsz: 0x0000000000000048 
> filesz: 0x00 00000000000048
>
> Jumping to boot code at 0x1092e4
>
> entry    = 0x001092e4
>
> lb_start = 0x00004000
>
> lb_size  = 0x00024000
>
> adjust   = 0xfe5d8400
>
> buffer   = 0xfe5b8400
>
> elf_boot_notes = 0x00015680
>
> adjusted_boot_notes = 0xfe5eda80

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