Re: [PATCH RESEND] iommu/amd: Fix BUG when faulting a PROT_NONE VMA

[Joerg Roedel <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>]

Hi Jay,

On Tue, Oct 13, 2015 at 04:52:43AM -0500, Jay Cornwall wrote:
> 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)));

Thanks for the fix! Next time please Cc me directly on patches for AMD
IOMMU code, so I see your patches earlier.

Also this looks relevant for stable, can you find out which stable
kernels need this fix too?


Thanks,

	Joerg