pid: Add a judgment for ns null in pid_nr_ns

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Microsoft Azure Sphere Linux namespace ptrace unsigned code execution vulnerability

Summary An unsigned code execution vulnerability exists in the Linux namespace ptrace functionality of Microsoft Azure Sphere 21.01. Specially crafted shellcode could allow an adversary to execute unsigned code. An attacker can change the namespace and use ptrace to modify the code of a running...

Microsoft Azure Sphere mqueue inode initialization kernel code execution vulnerability

Summary A code execution vulnerability exists in the mqueue inode initialization functionality of Microsoft Azure Sphere 21.01. A specially crafted set of syscalls can lead to uninitialized kernel read, which in turn leads to code execution in kernel. To trigger this vulnerability, an attacker ca...