diff options
Diffstat (limited to 'drivers/dax/dax.c')
| -rw-r--r-- | drivers/dax/dax.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/dax/dax.c b/drivers/dax/dax.c index 286447a..152552d 100644 --- a/drivers/dax/dax.c +++ b/drivers/dax/dax.c @@ -334,6 +334,7 @@ static int __dax_dev_fault(struct dax_dev *dax_dev, struct vm_area_struct *vma, int rc = VM_FAULT_SIGBUS; phys_addr_t phys; pfn_t pfn; + unsigned int fault_size = PAGE_SIZE; if (check_vma(dax_dev, vma, __func__)) return VM_FAULT_SIGBUS; @@ -344,6 +345,9 @@ static int __dax_dev_fault(struct dax_dev *dax_dev, struct vm_area_struct *vma, return VM_FAULT_SIGBUS; } + if (fault_size != dax_region->align) + return VM_FAULT_SIGBUS; + phys = pgoff_to_phys(dax_dev, vmf->pgoff, PAGE_SIZE); if (phys == -1) { dev_dbg(dev, "%s: phys_to_pgoff(%#lx) failed\n", __func__, @@ -389,6 +393,7 @@ static int __dax_dev_pmd_fault(struct dax_dev *dax_dev, phys_addr_t phys; pgoff_t pgoff; pfn_t pfn; + unsigned int fault_size = PMD_SIZE; if (check_vma(dax_dev, vma, __func__)) return VM_FAULT_SIGBUS; @@ -405,6 +410,16 @@ static int __dax_dev_pmd_fault(struct dax_dev *dax_dev, return VM_FAULT_SIGBUS; } + if (fault_size < dax_region->align) + return VM_FAULT_SIGBUS; + else if (fault_size > dax_region->align) + return VM_FAULT_FALLBACK; + + /* if we are outside of the VMA */ + if (pmd_addr < vma->vm_start || + (pmd_addr + PMD_SIZE) > vma->vm_end) + return VM_FAULT_SIGBUS; + pgoff = linear_page_index(vma, pmd_addr); phys = pgoff_to_phys(dax_dev, pgoff, PMD_SIZE); if (phys == -1) { |