4.2-stable review patch. If anyone has any objections, please let me know.
------------------ From: Jay Cornwall <j...@jcornwall.me> commit d14f6fced5f9360edca5a1325ddb7077aab1203b upstream. 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_struct *vma, .... 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 <j...@jcornwall.me> Signed-off-by: Joerg Roedel <jroe...@suse.de> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- drivers/iommu/amd_iommu_v2.c | 7 +++++++ 1 file changed, 7 insertions(+) --- 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 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 */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/