Messages in this thread | | | Date | Mon, 28 Nov 2005 22:02:11 -0800 | From | William Lee Irwin III <> | Subject | Re: Fix crash when ptrace poking hugepage areas |
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On Tue, Nov 29, 2005 at 04:06:28PM +1100, David Gibson wrote: > Bill, does this look like the correct fix for the problem to you? If > so, please apply Andrew. > set_page_dirty() will not cope with being handed a page * which is > part of a compound page, but not the master page in that compound > page. This case can occur via access_process_vm() if you attempt to > write to another process's hugepage memory area using ptrace() > (causing an oops or hang). > This patch fixes the bug by first resolving the page * to the compound > page's master page. > Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
akpm had already responded, but my general response would have been "Why on earth would you mark a hugepage dirty?" or similar.
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