full-disclosure - FAT32 input

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From: chris at defcon.org (chris)
Subject: FAT32 input > output = null?

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This also works with the 2.4.24 Linux kernel (Slackware 9.1):

chris@...mer:~$ more testfile.txt
Let's try this in Linux
chris@...mer:~$ ls -al testfile.txt
- -rw-r--r--    1 chris    users          24 Apr  7 12:43 testfile.txt
chris@...mer:~$ testfile.txt>testfile.txt
- -bash: ./testfile.txt: Permission denied
chris@...mer:~$ more testfile.txt
chris@...mer:~$ ls -al testfile.txt
- -rw-r--r--    1 chris    users           0 Apr  7 12:44 testfile.txt
chris@...mer:~$

Tried with +x too:

chris@...mer:~$ mv testfile.txt testfile
chris@...mer:~$ echo "ls -al">testfile
chris@...mer:~$ ls -al testfile
- -rw-r--r--    1 chris    users           7 Apr  7 12:48 testfile
chris@...mer:~$ chmod u+x testfile
chris@...mer:~$ ls -al testfile
- -rwxr--r--    1 chris    users           7 Apr  7 12:48 testfile*
chris@...mer:~$ ./testfile
total 346520
<My ls snipped>
chris@...mer:~$ testfile>testfile
- -bash: ./testfile: Text file busy
chris@...mer:~$ ls -al testfile
- -rwxr--r--    1 chris    users           0 Apr  7 12:49 testfile*


Chris



__________________________________
YAP, works for ntfs too...

- --------------------------------------
- --- morning_wood <se_cur_ity@...mail.com> wrote:
> Fat32 file output redirect overwrites self.
> ===========================
>
> odd behavior... >?
>
> 1.) console application output redirected to itself
> ( file.ext > file.ext )
> C:\test>program.exe >program.exe
>  program.exe

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