Messages in this thread |  | | From | Keith Owens <> | Subject | Re: Modprobe local root exploit | Date | Thu, 16 Nov 2000 17:14:54 +1100 |
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On 15 Nov 2000 22:04:47 -0800, "H. Peter Anvin" <hpa@zytor.com> wrote: >No, it's correct, actually, but probably not what you want. It will >include all letters [A-Za-z], but if a module named "ärlig"...
Trying to sanitise the module name in request_module is the wrong fix anyway, the kernel can ask for any module name it likes. What it must not do is treat user supplied input _unchanged_ as a module name.
modutils 2.3.20 (just released) fixes all the known local root exploits, without kernel changes. However 2.3.20 does nothing about this problem: "ping6 -I module_name" which lets any user load any module. That problem exists because the kernel passes user supplied data unchanged to request_module. The only fix is to add a prefix to user supplied input (say 'user-interface-') before passing the text to request_module. This has to be fixed in the higher layers of the kernel, it cannot be fixed in request_module or modprobe.
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