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[Xen-devel] RE: A race condition in xenlinux exit_mmap
| To: | "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] RE: A race condition in xenlinux exit_mmap |
| From: | "Li, Xin B" <xin.b.li@xxxxxxxxx> |
| Date: | Tue, 1 Aug 2006 21:46:57 +0800 |
| Cc: | hanzhu@xxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Tue, 01 Aug 2006 06:47:29 -0700 |
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| Thread-index: | Aca1WeSfBVVCqzbHSHGjY4WK7+bWOwAES0og |
| Thread-topic: | A race condition in xenlinux exit_mmap |
> 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
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