If I remember it right, only 1 ptrace can be attached. So this seems easy to fix:. Just ptrace yourself, and nobody else will.
As a bonus, write important state to memory supposed to be read-only. If someone hooked your ptrace, the hook has to reimplement ptrace in a lot more detail. Or use breakpoints as a mechanism to call subroutines.
As a bonus, write important state to memory supposed to be read-only. If someone hooked your ptrace, the hook has to reimplement ptrace in a lot more detail. Or use breakpoints as a mechanism to call subroutines.