On Thursday 12 April 2007 12:37, Alan Cox wrote:
> > + if (PTR_ERR(sa->name) == -ENOENT && (check & AA_CHECK_FD))
> > + denied_mask = 0;
>
> Now there is an interesting question. Is PTR_ERR() safe for kernel
> pointers on all platforms or just for user ones ?
It's used for kernel pointers all over the place and mmap also mixes user
addresses with -Exxx, so it's definitely supposed to work. I'm not sure how
exactly the topmost page is kept from getting mapped.
Andreas
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