unable to create any directory that uses numbers as the directory name Post: 302151923

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Top Forums UNIX for Advanced & Expert Users unable to create any directory that uses numbers as the directory name Post 302151923 by Hookups on Tuesday 18th of December 2007 12:33:08 AM

12-18-2007

Registered User

The posted binary is not the exact same as md5sums do not match. However, the file size is spot on. Also the same characteristics. Namely, the binary looks to be broken, but still loadable by the linux kernel:

---
[badfile@host badfiles]$ readelf -a ./mount
ELF Header:
Magic: 7f 45 4c 46 00 00 00 00 00 00 00 00 00 00 00 00
Class: none
Data: none
Version: 0
OS/ABI: UNIX - System V
ABI Version: 0
Type: EXEC (Executable file)
Machine: Intel 80386
Version: 0x1
Entry point address: 0x1df26054
Start of program headers: 52 (bytes into file)
Start of section headers: 0 (bytes into file)
Flags: 0x0
Size of this header: 52 (bytes)
Size of program headers: 32 (bytes)
Number of program headers: 1
Size of section headers: 0 (bytes)
Number of section headers: 0
Section header string table index: 0

There are no sections in this file.

There are no section groups in this file.

Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
LOAD 0x000000 0x1df26000 0x1df26000 0x8453f 0x13e000 RWE 0x1000

There is no dynamic section in this file.

There are no relocations in this file.

There are no unwind sections in this file.

No version information found in this file.
[badfile@host badfiles]$ objdump -d ./mount
objdump: ./mount: File format not recognized
[badfile@host badfiles]$ file ./mount
mount: ELF invalid class invalid byte order (SYSV)
---

strace as unprivileged user show one system call to 'sysinfo()' with the argument of '0'. It returns an error:

---
[badfile@host evil_mount]$ strace ./mount
execve("./mount", ["./mount"], [/* 22 vars */]) = 0
sysinfo(0) = -1 EFAULT (Bad address)
---

Going to look further into the binary from an analysis workstation I have setup and see if I can get any more information.

Cheers,
Hookups

Hookups

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LEARN ABOUT POSIX

nfsmount.conf

NFSMOUNT.CONF(5)						File Formats Manual						  NFSMOUNT.CONF(5)

NAME

       nfsmount.conf - Configuration file for NFS mounts

SYNOPSIS

       Configuration file for NFS mounts that allows options to be set globally, per server or per mount point.

DESCRIPTION

       The  configuration  file  is  made  up  of multiple sections followed by variables associated with that section.  A section is defined by a
       string enclosed by [ and ] branches.  Variables are assignment statements that assign values to particular variables using the =  operator,
       as in Proto=Tcp.  Sections are broken up into three basic categories: Global options, Server options and Mount Point options.

       [ NFSMount_Global_Options ] - This statically named section defines all of the global mount options that can be applied to every NFS mount.

       [  Server  "Server_Name"  ]  -  This  section  defines  all the mount options that should be used on mounts to a particular NFS server. The
	      "Server_Name" strings needs to be surrounded by '"' and be an exact match of the server name used in the mount command.

       [ MountPoint "Mount_Point" ] - This section defines all the  mount  options  that  should  be  used  on	a  particular  mount  point.   The
	      "Mount_Point" string needs to be surrounded by '"' and be an exact match of the mount point used in the mount command.

EXAMPLES

       These are some example lines of how sections and variables are defined in the configuration file.

       [ NFSMount_Global_Options ]
	   Proto=Tcp

	      The TCP protocol will be used on every NFS mount.

       [ Server "nfsserver.foo.com" ]
	   rsize=32k
	   wsize=32k

	      A 33k (32768 bytes) block size will be used as the read and write size on all mounts to the 'nfsserver.foo.com' server.

	[ MountPoint "/export/home" ]
	   Background=True

	      All mounts to the '/export/home' export will be performed in the background (i.e. done asynchronously).

FILES

       /etc/nfsmount.conf
		 Default NFS mount configuration file

SEE ALSO

       nfs(5), mount(8),

								    9 Mar 2008							  NFSMOUNT.CONF(5)

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