[PATCH] try_to_unmap_cluster() passes out-of-bounds pte to pte_unmap()

try_to_unmap_cluster() does:
        for (pte = pte_offset_map(pmd, address);
                        address < end; pte++, address += PAGE_SIZE) {
		...
	}

	pte_unmap(pte);

It may take a little staring to notice, but pte can actually fall off the
end of the pte page in this iteration, which makes life difficult for
kmap_atomic() and the users not expecting it to BUG().  Of course, we're
somewhat lucky in that arithmetic elsewhere in the function guarantees that
at least one iteration is made, lest this force larger rearrangements to be
made.  This issue and patch also apply to non-mm mainline and with trivial
adjustments, at least two related kernels.

Discovered during internal testing at Oracle.

Signed-off-by: William Irwin <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Chris Wright <chrisw@osdl.org>

diff --git a/mm/rmap.c b/mm/rmap.c
index 4ff8183fa18e9e32c8316a37e56a321fd00df852..895a454820b69d091d13bcc46c6b60c4ce41db69 100644 (file)
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -641,7 +641,7 @@ static void try_to_unmap_cluster(unsigned long cursor,
        pgd_t *pgd;
        pud_t *pud;
        pmd_t *pmd;
-       pte_t *pte;
+       pte_t *pte, *original_pte;
        pte_t pteval;
        struct page *page;
        unsigned long address;
@@ -673,7 +673,7 @@ static void try_to_unmap_cluster(unsigned long cursor,
        if (!pmd_present(*pmd))
                goto out_unlock;
 
-       for (pte = pte_offset_map(pmd, address);
+       for (original_pte = pte = pte_offset_map(pmd, address);
                        address < end; pte++, address += PAGE_SIZE) {
 
                if (!pte_present(*pte))
@@ -710,7 +710,7 @@ static void try_to_unmap_cluster(unsigned long cursor,
                (*mapcount)--;
        }
 
-       pte_unmap(pte);
+       pte_unmap(original_pte);
 
 out_unlock:
        spin_unlock(&mm->page_table_lock);