Re: CONFIG_DEBUG_PAGEALLOC and virt_addr_valid()

[Sridhar Samudrala]

On Thu, 1 Apr 2004, Christoph Hellwig wrote:

> On Thu, Apr 01, 2004 at 11:11:39AM -0800, Sridhar Samudrala wrote:
> > When CONFIG_DEBUG_PAGEALLOC is enabled, i am noticing that virt_addr_valid()
> > (called from sctp_is_valid_kaddr()) is returning true even for freed objects.
> > Is this a bug or expected behavior?
>
> Generally every use of virt_addr_valid() is a bug.  What are you trying to
> do?

We are trying to validate a kernel address that is passed by the user. Is
there a better way to do that?

When an SCTP association is established, the pointer to the association
structure is passed to the user as an identifier of the association. This
identifier is used in the later calls by the user.

-Sridhar
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