Andreas Gruenbacher wrote:
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.
Yeah, the comments indicate it was first used for dentries.
I wonder if it shouldn't be using the NULL page instead? (ie 0-4095)
--
SUSE Labs, Novell Inc.
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