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CONFIG_HARDENED_USERCOPY_PAGESPAN: Refuse to copy allocations that span multiple pages

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The Linux kernel configuration item CONFIG_HARDENED_USERCOPY_PAGESPAN:

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When a multi-page allocation is done without __GFP_COMP, hardened usercopy will reject attempts to copy it. There are, however, several cases of this in the kernel that have not all been removed. This config is intended to be used only while trying to find such users.



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