I don't quite get why this is a problem per se. I mean, the environment is just a chunk of memory made available to the process by the OS. It is no more, no le

I don't quite get why this is a problem per se. I mean, the environment is just a chunk of memory made available to the process by the OS. It is no more, no less thread safe than any other chunk of memory. Why would the libc need to protect it more than any other memory location?