On Tue, 18 Dec 2012 13:04:49 -0800
Kees Cook <[email protected]> wrote:
> Some devices have configurable firmware locations. If these configuration
> mechanisms are exposed to unprivileged userspace, it may be possible to
> load firmware from an unexpected location. To minimize the risk of this,
> make sure the string "../" does not appear in the firmware name. This
> means that neither the users of request_firmware, nor the uevent handler
> have to do this filtering themselves.
Have you verified no existing distribution ever does this ?
> + if (strstr(name, "../")) {
and this is obviously buggy and hasn't been tested
Hint foo/bar../baz
You need to check for ^../ /../ and /..$
Alan
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