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Top Forums Shell Programming and Scripting Why my SETUID does not work as expected? Post 302960441 by summer_cherry on Monday 16th of November 2015 03:31:06 AM
Old 11-16-2015
Why my SETUID does not work as expected?

Hi All,

Thanks for your help in advanced.

Could you please kindly help on why my SETUID does not work?

create a file, only root can read write it
Code:
/tmp>ls -l a.log
-rw------- 1 root root 3 Nov 12 18:57 a.log

create a script under root with SETUID
Code:
/tmp>ls -l a.sh
-rwsr-sr-x 1 root root 23 Nov 16 00:18 a.sh

the script will read above created file
Code:
/tmp>cat a.sh
#! /bin/bash
cat a.log

run under non-root account, but still failed? why?
Code:
/tmp>a.sh
cat: a.log: Permission denied


Is it due to 'cat' is not setuid? If so, how can I modify my script to let SETUID take effect?
 

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BZEXE(1)						      General Commands Manual							  BZEXE(1)

NAME
bzexe - compress executable files in place SYNOPSIS
bzexe [ name ... ] DESCRIPTION
The bzexe utility allows you to compress executables in place and have them automatically uncompress and execute when you run them (at a penalty in performance). For example if you execute ``bzexe /bin/cat'' it will create the following two files: -r-xr-xr-x 1 root bin 9644 Feb 11 11:16 /bin/cat -r-xr-xr-x 1 bin bin 24576 Nov 23 13:21 /bin/cat~ /bin/cat~ is the original file and /bin/cat is the self-uncompressing executable file. You can remove /bin/cat~ once you are sure that /bin/cat works properly. This utility is most useful on systems with very small disks. OPTIONS
-d Decompress the given executables instead of compressing them. SEE ALSO
bzip2(1), znew(1), zmore(1), zcmp(1), zforce(1) CAVEATS
The compressed executable is a shell script. This may create some security holes. In particular, the compressed executable relies on the PATH environment variable to find gzip and some other utilities (tail, chmod, ln, sleep). BUGS
bzexe attempts to retain the original file attributes on the compressed executable, but you may have to fix them manually in some cases, using chmod or chown. BZEXE(1)
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