linux-kernel - bug in the way Linux loads elf files...

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAPGNrUWYc6xzaqPnLmD12Vaz3mr9hEA6k4OP70FCjhBYM7mVhA@mail.gmail.com>
Date:	Sun, 11 Mar 2012 17:49:40 -0500
From:	Mark Manning <mark4th@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: bug in the way Linux loads elf files...

It seems that the linux kernel does not exactly conform to the TIS elf
standard.  as follows...

I have a small asm source file that a assemble with nasm

  [section text]
  global _start

_start:
  mov eax, 1
  int 0x80

after linking i end up with a elf executable which does nothing
execept terminate which of course works perfectly fine.

If however i modify the .text sections program header to make the
memory size larger than the file size the process is killed before it
is even run.  I have not tracked down where this happens.

  Type            Offset       VirtAddr         PhysAddr     FileSiz
MemSiz  Flg Align
  LOAD           0x000000 0x08048000 0x08048000 0x0007b 0x01000 R   0x1000

i patched MemSiz to be larger than FileSiz which should work but does not.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/