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CONFIG_HARDENED_USERCOPY: Harden memory copies between kernel and userspace

General informations

The Linux kernel configuration item CONFIG_HARDENED_USERCOPY:

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This option checks for obviously wrong memory regions when copying memory to/from the kernel (via copy_to_user() and copy_from_user() functions) by rejecting memory ranges that are larger than the specified heap object, span multiple separately allocates pages, are not on the process stack, or are part of the kernel text. This kills entire classes of heap overflow exploits and similar kernel memory exposures.



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