Re: [RFC][PATCH] Prevent overriding of Symbols in the Kernel,avoiding Undefined behaviour

[Andrew Morton]

Ashutosh Naik <ashutosh.naik@xxxxxxxxx> wrote:
>
> When a symbol is exported from the kernel, and say, a module would
>  export the same symbol, there currently exists no mechanism to prevent
>  the module from exporting this symbol. The module would still go ahead
>  and export the symbol, the symbol table would now contain two copies
>  of the exported symbol, and hell would break loose.
> 
>  This patch prevents that from happening, by checking the symbol table
>  before relocation for all occurences of the Exported Symbol. If the
>  symbol already exists, we branch out with -ENOEXEC. Currently, this
>  search is sequential.

Do we really need to do this at runtime?  We could check this when building
module depoendencies (for example).  That'll be a 95% solution..
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