On Wed, Jul 7, 2010 at 10:11 AM, Ulrich Drepper <drepper@xxxxxxxxxx> wrote:
>
> How does this work with old kernels which didn't initialize f_spare?
Some of the compat layers (and older kernels) don't copy the f_spare
values, so user space should clear the field before doing the system
call, and you should be ok.
There should be no actual _uninitialized_ values copied from the
kernel. IOW, either the kernel writes zero, or it doesn't write
anything at all. Anything else would be a security issue anyway (ie
kernel stack data leak). Afaik, no kernel does that.
Problem solved.
Linus
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