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>
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@ -87,7 +87,7 @@ void __init paging_init(void)
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int cf_tlb_miss(struct pt_regs *regs, int write, int dtlb, int extension_word)
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{
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unsigned long flags, mmuar;
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unsigned long flags, mmuar, mmutr;
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struct mm_struct *mm;
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pgd_t *pgd;
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pmd_t *pmd;
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@ -137,9 +137,10 @@ int cf_tlb_miss(struct pt_regs *regs, int write, int dtlb, int extension_word)
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if (!pte_dirty(*pte) && !KMAPAREA(mmuar))
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set_pte(pte, pte_wrprotect(*pte));
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mmu_write(MMUTR, (mmuar & PAGE_MASK) | (asid << MMUTR_IDN) |
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(((int)(pte->pte) & (int)CF_PAGE_MMUTR_MASK)
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>> CF_PAGE_MMUTR_SHIFT) | MMUTR_V);
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mmutr = (mmuar & PAGE_MASK) | (asid << MMUTR_IDN) | MMUTR_V;
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if ((mmuar < TASK_UNMAPPED_BASE) || (mmuar >= TASK_SIZE))
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mmutr |= (pte->pte & CF_PAGE_MMUTR_MASK) >> CF_PAGE_MMUTR_SHIFT;
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mmu_write(MMUTR, mmutr);
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mmu_write(MMUDR, (pte_val(*pte) & PAGE_MASK) |
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((pte->pte) & CF_PAGE_MMUDR_MASK) | MMUDR_SZ_8KB | MMUDR_X);
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