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Re: setuid from shellscript isn't permanent


From: Chet Ramey
Subject: Re: setuid from shellscript isn't permanent
Date: Sat, 19 Jul 2008 19:19:37 -0400
User-agent: Thunderbird 2.0.0.14 (Macintosh/20080421)

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    address@hidden    http://cnswww.cns.cwru.edu/~chet/




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