Re: setuid from shellscript isn't permanent

[Chet Ramey]

Mr Aras wrote:
> Hi, 
>
> I've got a shell script for installing a binary. In this script I set the
> binary to mode 4755. When I 'ls' the binary from within the shell script I
> see that it has the setuid bit set. When I exit the shell script, the binary
> is no longer setuid.
>
> I can setuid the binary from outside the shell script.
>
> How can I setuid from within a shell script and have it stay that way?
>
> e.g.
>
> $ ./setuid_test_script.sh
> mode of `/nfsroot/bin/busybox' changed to 4755 (rwsr-xr-x)
> -rwsr-xr-x 1 root root 515956 2008-07-18 11:46 /nfsroot/bin/busybox
>
> $ ls /nfsroot/bin/busybox
> -rwxr-xr-x 1 root root 515956 2008-07-18 11:45 /nfsroot/bin/busybox
>
> $ sudo chmod 4755 /nfsroot/bin/busybox
>
> $ ls -al /nfsroot/bin/busybox
> -rwsr-xr-x 1 root root 515956 2008-07-18 11:46 /nfsroot/bin/busybox

Impossible to say without more information.  There's nothing in bash
itself that would cause it to remove the setuid bit from arbitrary
files created during a script's execution.

Chet

--
``The lyf so short, the craft so long to lerne.'' - Chaucer

Chet Ramey, ITS, CWRU    chet@case.edu    http://cnswww.cns.cwru.edu/~chet/