[Xen-devel] RE: A race condition in xenlinux exit_mmap

["Li, Xin B" <xin.b.li@xxxxxxxxx>]

>  1. Add an 'int has_foreign_mappings' to mmu_context structure
>  2. Ensure the field is initialised in init_new_context() (e.g., 
>memset-zero the whole structure; already done on x86/64)
>  3. Set the field in direct_remap_pfn_range()
>  4. Check the field in _arch_exit_mmap() to avoid calling mm_unpin().
>
>That's it. Just needs testing.
>

Patch attached, and it passed on our patch test system.
-Xin

Attachment: fix_exit_mmap.patch
Description: fix_exit_mmap.patch

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