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General informations

The Linux kernel configuration item CONFIG_SHADOW_CALL_STACK:

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This option enables Clang's Shadow Call Stack, which uses a shadow stack to protect function return addresses from being overwritten by an attacker. More information can be found in Clang's documentation:

Note that security guarantees in the kernel differ from the ones documented for user space. The kernel must store addresses of shadow stacks in memory, which means an attacker capable of reading and writing arbitrary memory may be able to locate them and hijack control flow by modifying the stacks.



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