Messages in this thread | | | Date | Thu, 11 May 2023 07:51:58 +0900 | From | Greg Kroah-Hartman <> | Subject | Re: [PATCH 0/4] Fix type confusion in page_table_check |
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On Wed, May 10, 2023 at 04:55:23PM +0800, Ruihan Li wrote: > Recently, syzbot reported [1] ("kernel BUG in page_table_check_clear"). > The root cause is that usbdev_mmap calls remap_pfn_range on kmalloc'ed > memory, which leads to type confusion between struct page and slab in > page_table_check. This series of patches fixes the usb side by avoiding > mapping slab pages into userspace, and fixes the mm side by enforcing > that all user-accessible pages are not slab pages. A more detailed > analysis and some discussion of how to fix the problem can also be found > in [1]. > > [1] https://lore.kernel.org/lkml/20230507135844.1231056-1-lrh2000@pku.edu.cn/T/
Can you see if you can implement Christoph's proposed change instead: https://lore.kernel.org/r/ZFuZVDcU81WmqEvJ@infradead.org
As it might not actually be as bad as you think to require this type of churn.
thanks,
greg k-h
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