m68k: Do not set global share for non-kernel shared pages

If the SG bit is set in MMUTR the page is accessible for all
userspace processes (ignoring the ASID). So a process might randomly
access a page from a different process which had a shared page
(from shared memory) in its context.

Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>

diff --git a/arch/m68k/mm/mcfmmu.c b/arch/m68k/mm/mcfmmu.c
index babd5a9..875b800 100644 (file)
--- a/arch/m68k/mm/mcfmmu.c
+++ b/arch/m68k/mm/mcfmmu.c
@@ -87,7 +87,7 @@ void __init paging_init(void)
 
 int cf_tlb_miss(struct pt_regs *regs, int write, int dtlb, int extension_word)
 {
-       unsigned long flags, mmuar;
+       unsigned long flags, mmuar, mmutr;
        struct mm_struct *mm;
        pgd_t *pgd;
        pmd_t *pmd;
@@ -137,9 +137,10 @@ int cf_tlb_miss(struct pt_regs *regs, int write, int dtlb, int extension_word)
        if (!pte_dirty(*pte) && !KMAPAREA(mmuar))
                set_pte(pte, pte_wrprotect(*pte));
 
-       mmu_write(MMUTR, (mmuar & PAGE_MASK) | (asid << MMUTR_IDN) |
-               (((int)(pte->pte) & (int)CF_PAGE_MMUTR_MASK)
-               >> CF_PAGE_MMUTR_SHIFT) | MMUTR_V);
+       mmutr = (mmuar & PAGE_MASK) | (asid << MMUTR_IDN) | MMUTR_V;
+       if ((mmuar < TASK_UNMAPPED_BASE) || (mmuar >= TASK_SIZE))
+               mmutr |= (pte->pte & CF_PAGE_MMUTR_MASK) >> CF_PAGE_MMUTR_SHIFT;
+       mmu_write(MMUTR, mmutr);
 
        mmu_write(MMUDR, (pte_val(*pte) & PAGE_MASK) |
                ((pte->pte) & CF_PAGE_MMUDR_MASK) | MMUDR_SZ_8KB | MMUDR_X);