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You can't secure a file by doing that justb ecause it's not in there search path doesn't mean they can't type out the whole path to execute it. You can "chmod 750 /bin/uname" but it seems that most everything wants to execute uname so you might break some apps that rely on this.
Your right, it is probably not a good idea since other apps rely on this. My host runs Apache, MySQL and SSH services... I thought it may help to prevent someone from gaining (advertised) knowledge of the kernel version and using specific vulnerabilities.
Although the uname command should only be visible within a shell, there are leaks from various web services (phpinfo(), phpmyadmin, mambo, etc).
No worries - it seems like this is security through obscurity anyways. I'll stick to iptables.
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