From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Theodore Tso <tytso@mit.edu>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Add user taint flag
Date: Tue, 23 May 2006 09:49:20 +1000 [thread overview]
Message-ID: <44724E00.8090000@yahoo.com.au> (raw)
In-Reply-To: <20060522183352.GA4453@thunk.org>
Theodore Tso wrote:
>
>+struct page *rmem_vma_nopage(struct vm_area_struct *vma,
>+ unsigned long address, int *type)
>+{
>+ struct page *pageptr;
>+ unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
>+ unsigned long physaddr = address - vma->vm_start + offset;
>+ unsigned long pageframe = physaddr >> PAGE_SHIFT;
>+
>+ if (!pfn_valid(pageframe))
>+ return NOPAGE_SIGBUS;
>+ pageptr = pfn_to_page(pageframe);
>+ get_page(pageptr);
>+ if (type)
>+ *type = VM_FAULT_MINOR;
>+ return pageptr;
>+}
>
This won't work because struct page could easily be a free page.
I think /dev/mem should be able to remap physical memory now that
PG_reserved is gone.
--
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next prev parent reply other threads:[~2006-05-22 23:49 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-21 23:04 [PATCH] Add user taint flag Theodore Ts'o
2006-05-22 10:36 ` Andrew Morton
2006-05-22 18:33 ` Theodore Tso
2006-05-22 23:49 ` Nick Piggin [this message]
2006-05-24 13:43 ` Stefan Seyfried
2006-05-22 12:17 ` Stephen C. Tweedie
2006-05-22 14:14 ` Arjan van de Ven
2006-05-22 14:35 ` Alan Cox
2006-05-22 14:29 ` Valdis.Kletnieks
2006-05-22 18:56 ` Jan Engelhardt
2006-05-22 14:37 ` Arjan van de Ven
2006-05-23 1:11 ` Theodore Tso
2006-05-22 15:48 ` Randy.Dunlap
2006-05-23 18:45 ` Greg KH
2006-05-24 13:39 ` Theodore Tso
2006-05-24 13:55 ` Dave Jones
2006-05-24 14:15 ` Dave Jones
2006-05-25 15:01 ` Greg KH
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