Re: [Bugme-new] [Bug 8957] New: Exported functions and variablesshould not be reachable by the outside of the module until module_init finishes

[Robert Hancock]

Andrew Morton wrote:
> On Wed, 29 Aug 2007 11:33:06 -0700 (PDT) bugme-daemon@xxxxxxxxxxxxxxxxxxx wrote:
>
> > http://bugzilla.kernel.org/show_bug.cgi?id=8957
> >
> >            Summary: Exported functions and variables should not be reachable
> >                     by the outside of the module until module_init finishes
> >            Product: Other
> >            Version: 2.5
> >      KernelVersion: 2.6.23-rc4
> >           Platform: All
> >         OS/Version: Linux
> >               Tree: Mainline
> >             Status: NEW
> >           Severity: normal
> >           Priority: P1
> >          Component: Modules
> >         AssignedTo: other_modules@xxxxxxxxxxxxxxxxxxxx
> >         ReportedBy: mattilinnanvuori@xxxxxxxxx
> >
> >
> > Problem Description: a module's exported functions can be called before before
> > they are properly initialized by the module_init function.
> >
> > Steps to reproduce: write a module that exports functions that require
> > initialization by the module_init function to work correctly.
> >
> > E.g. spin lock variables are no longer allowed to be initialized by C
> > initializers of the module but only by spin_lock_init that can be called by the
> > module_init function. If an exported function calls spin_lock before it is
> > initialized, it deadlocks.
>
> ooh, nice bug ;)

Under what circumstances is this actually happening? What are these 
functions that are being called?

Normally things are set up such that this isn't a problem, i.e. if 
module A depends on module B, module A can't load until module B is 
finished loading.

--
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@xxxxxxxxxxxxx
Home Page: http://www.roberthancock.com/

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