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The kernel relies fairly heavily on self-modifying code, so the mechanisms to do this modification safely are there, however the duty must nonetheless be dealt with carefully. The lack to jot down to executable memory in straightforward ways, together with the fact that executable reminiscence in the kernel must be read-only, presents challenges for the JIT compiler. So when the brand new allocator is invoked to find a spot for a brand new program, it really allocates two buffers. The first is the learn-only, executable house the place this system is destined to live; the second is bizarre memory obtained with kvmalloc(). The JIT compiler will compile into the second buffer, which could be written to, however any addresses it generates have to be relative to the first buffer as an alternative. Once the compilation process is full, the kernel’s “text poke” equipment, enhanced with a new copy perform, can be used to move the compiled program into the learn-solely house and the non permanent buffer freed.