linux-kernel - virt_to_page for userspace pointers (was: Reversing a memory mapping?)

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sat, 05 Feb 2011 16:04:08 -0500
From:	Nikolaus Rath <Nikolaus@...h.org>
To:	linux-kernel@...r.kernel.org
Subject: virt_to_page for userspace pointers (was: Reversing a memory mapping?)

Nikolaus Rath <Nikolaus@...h.org> 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?


Thanks,

   -Nikolaus

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

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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/