Messages in this thread | | | Date | Tue, 5 Mar 2013 11:32:00 -0800 | Subject | Re: [PATCH 2/2] fs: Limit sys_mount to only request filesystem modules. | From | Kees Cook <> |
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On Tue, Mar 5, 2013 at 11:06 AM, Kay Sievers <kay@vrfy.org> wrote: > On Mon, Mar 4, 2013 at 8:51 AM, Eric W. Biederman <ebiederm@xmission.com> wrote: >> >> Modify the request_module to prefix the file system type with "fs-" >> and add aliases to all of the filesystems that can be built as modules >> to match. >> >> A common practice is to build all of the kernel code and leave code >> that is not commonly needed as modules, with the result that many >> users are exposed to any bug anywhere in the kernel. >> >> Looking for filesystems with a fs- prefix limits the pool of possible >> modules that can be loaded by mount to just filesystems trivially >> making things safer with no real cost. > > '-' is a commonly used part of a module name, and does not mix well > with ramdom user provided names. > > We usually use ':' as the prefix separator for modaliases, when > user-supplied strings are prefixed with the subsystem. > > I think it would be nicer to change that, and I'm sure some creative > guy calls the next filesystem of the month fs-$something :)
The precedent is "-". "netdev-" "pf-net-" etc. Naming something fs-$something is fine as long as it's actually a filesystem. :)
-Kees
-- Kees Cook Chrome OS Security
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