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SubjectRe: Local root exploit with kmod and modutils > 2.1.121
Date
On Thu, 16 Nov 2000 16:04:23 +0000 (GMT), 
Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
>> request_module has the same effect as running suid. dev_load() can
>> take the interface name and pass it to modprobe unchanged and modprobe
>> does not verify its input, it trusts root/kernel.
>
>Then dev_load is being called the wrong way. In older kernels we explicitly
>only did a dev_load with user passed names providing suser() was true.

ping6 -I module_name. ping6 is setuid, it passes the interface name to
the kernel while it holds root privileges, suser() == true. It is
not reasonable to expect setuid programs to know that Linux does
something special with some parameters when no other O/S has that
"feature".

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