handle_mm_fault indirectly triggers a BUG in do_numa_page when given a VMA without read/write/execute access. Check this condition in do_fault.
do_fault -> handle_mm_fault -> handle_pte_fault -> do_numa_page mm/memory.c 3147 static int do_numa_page(struct mm_struct *mm, struct vm_area_st... .... 3159 /* A PROT_NONE fault should not end up here */ 3160 BUG_ON(!(vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE))); Signed-off-by: Jay Cornwall <[email protected]> --- drivers/iommu/amd_iommu_v2.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/iommu/amd_iommu_v2.c b/drivers/iommu/amd_iommu_v2.c index 1131664..d21d4ed 100644 --- a/drivers/iommu/amd_iommu_v2.c +++ b/drivers/iommu/amd_iommu_v2.c @@ -516,6 +516,13 @@ static void do_fault(struct work_struct *work) goto out; } + if (!(vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE))) { + /* handle_mm_fault would BUG_ON() */ + up_read(&mm->mmap_sem); + handle_fault_error(fault); + goto out; + } + ret = handle_mm_fault(mm, vma, address, write); if (ret & VM_FAULT_ERROR) { /* failed to service fault */ -- 1.9.1 _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
