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Kernel: Add "prot_exec" pledge promise and require it for PROT_EXEC
This prevents sys$mmap() and sys$mprotect() from creating executable memory mappings in pledged programs that don't have this promise. Note that the dynamic loader runs before pledging happens, so it's unaffected by this.
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@ -53,6 +53,7 @@ If the process later attempts to use any system functionality it has previously
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* `sendfd`: Send file descriptors over a local socket
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* `recvfd`: Receive file descriptors over a local socket
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* `ptrace`: The [`ptrace(2)`](ptrace.md) syscall (\*)
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* `prot_exec`: [`mmap(2)`](mmap.md) and [`mprotect(2)`](mprotect.md) with `PROT_EXEC` (\*)
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Promises marked with an asterisk (\*) are SerenityOS specific extensions not supported by the original OpenBSD `pledge()`.
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