Messages in this thread | | | Date | Thu, 1 Apr 2004 16:29:43 -0800 | From | Andrew Morton <> | Subject | Re: CONFIG_DEBUG_PAGEALLOC and virt_addr_valid() |
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Sridhar Samudrala <sri@us.ibm.com> wrote: > > 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?
yup. Pass the user an integer.
> 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.
Please don't do that. See lib/idr.c. I expect it does exactly what you want. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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