[LLVMdev] rwx pages dangerous?

[Josh Haberman]

I noticed that JITMemoryManager allocates its slabs as rwx.  Isn't it a
security problem to have memory mapped as both writable and executable?  I
think JITs often avoid this by mapping their memory as rw, then switching
it to rx once the data has been written.  I was facing a similar problem in
a JIT of my own and was curious to see how LLVM addresses this issue.

Thanks,
Josh
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