Today I learned, courtesy of @DirtyCOWVuln, that ptrace(PTRACE_POKEDATA) can write to readonly mappings. Now I'm unhappy.
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Yeah, I eventually pieced together why we have this behavior. Still don't like it :(
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the really fun part is that PTRACE_POKEDATA isn't the only thing doing forced writes
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also /proc/$pid/mem and various drivers that can do memory-mapped IO
End of conversation
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