[Bug runtime/14650] New: combine various untrusted-deref operations

["fche at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14650

             Bug #: 14650
           Summary: combine various untrusted-deref operations
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap@sourceware.org
        ReportedBy: fche@redhat.com
    Classification: Unclassified


After bug #14364, #14630, there still exist several distinct paths where user-
or kernel-space untrusted pointers may be used with checks that don't pass 100%
lockdep / .debug-kernel muster.  There are too many implementations of
__get_user_foobar-ish type functions in the runtime, like runtime/linux/copy.c,
stp_string.c, loc2c-runtime.h, etc.  Let's standardize on the latter to the
maximum extent possible.

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