Messages in this thread | | | Date | Mon, 13 Feb 2012 02:12:21 -0800 (PST) | From | David Rientjes <> | Subject | Re: [PATCH] Ensure that walk_page_range()'s start and end are page-aligned |
| |
On Fri, 10 Feb 2012, Dan Smith wrote:
> The inner function walk_pte_range() increments "addr" by PAGE_SIZE after > each pte is processed, and only exits the loop if the result is equal to > "end". Current, if either (or both of) the starting or ending addresses > passed to walk_page_range() are not page-aligned, then we will never > satisfy that exit condition and begin calling the pte_entry handler with > bad data. > > To be sure that we will land in the right spot, this patch checks that > both "addr" and "end" are page-aligned in walk_page_range() before starting > the traversal. >
It doesn't "ensure" anything without CONFIG_DEBUG_VM enabled, which isn't the default.
| |