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From: Nikolaus Rath <>
Subject: virt_to_page for userspace pointers (was: Reversing a memory mapping?)
Date: Sat, 05 Feb 2011 16:04:08 -0500	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Nikolaus Rath <> writes:
> Is there a way that my own kernel module can "reverse" this mmap call?
> I.e. given the userspace pointer, how do I get access to the physical
> location of the memory that has been mapped?

Ok, after some studying I think I can ask the question in a better way:

Is there an equivalent function to virt_to_page (and virt_to_phys) that
works with userspace pointers? Or do I have to manually walk through the
page tables? In the later case, are there any examples of this kind of
search that I could use as a basis?



 »Time flies like an arrow, fruit flies like a Banana.«

  PGP fingerprint: 5B93 61F8 4EA2 E279 ABF6  02CF A9AD B7F8 AE4E 425C

  reply	other threads:[~2011-02-05 21:08 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-02-03 20:50 Reversing a memory mapping? Nikolaus Rath
2011-02-05 21:04 ` Nikolaus Rath [this message]
2011-02-05 21:36   ` virt_to_page for userspace pointers Brice Goglin
2011-02-13 20:24     ` Nikolaus Rath
2011-02-13 20:37       ` Brice Goglin
2011-02-13 21:56         ` Nikolaus Rath
2011-02-13 22:06           ` Alan Cox
2011-02-13 22:11             ` Nikolaus Rath
2011-02-14 22:46       ` Nikolaus Rath
2011-07-26 12:03         ` Alexey Skidanov

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