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by caf
3964 days ago
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No, Linux x86-64 doesn't change %cr3 on syscalls. It mitigates this kind of bug (kernel NULL pointer dereference) in a different way - by not allowing userspace processes to map memory at NULL. Linux also supports the SMAP feature on modern Intel CPUs which allows the kernel to set things up so that all accesses to usermode memory from kernel mode must be explicitly annotated. |
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