Documentation: Clarify f_cred vs current_cred() use

When making access control choices from a file-based context, f_cred
must be used instead of current_cred() to avoid confused deputy attacks
where an open file may get passed to a more privileged process. Add a
short paragraph to explicitly state the rationale.

Cc: Jonathan Corbet <[email protected]>
Cc: [email protected]
Signed-off-by: Kees Cook <[email protected]>
Link: https://lore.kernel.org/r/202007031038.8833A35DE4@keescook
Signed-off-by: Jonathan Corbet <[email protected]>

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