Process Launch Constraints for Operating System Security
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Solution Overview
Problem
Existing operating systems lack effective mechanisms to impose fine-grained launch constraints on processes, leading to vulnerabilities such as unauthorized process execution and privilege escalation, as the launch environment can be manipulated by attackers, making it difficult to ensure that processes run in their intended settings.
Innovation Solution
Implementing fine-grained launch constraints that can be embedded in binaries or specified during the launch command, allowing the operating system to evaluate and enforce specific preconditions before launching a process, thereby preventing unauthorized execution and ensuring that processes run only in intended environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fine-grained launch constraints are implemented, then process security is improved, but device complexity increases
Solution Approach 1:
The launch constraint mechanism is segmented into distinct components: constraint definitions embedded in executables, constraint evaluation by the kernel, and constraint enforcement during process launch. This segmentation allows the system to manage complexity through modular design while maintaining strong security guarantees.
Solution Approach 2:
Launch constraints are evaluated and enforced before the process actually launches. The kernel checks constraints during the launch request phase, preventing unauthorized processes from executing in the first place. This preliminary action ensures security is established proactively rather than reactively.
2Reliability
If launch constraints are enforced, then unauthorized process execution is prevented, but process launch time increases
Solution Approach 1:
Constraints are evaluated during the launch request phase before the actual process execution begins. This timing ensures that security checks are performed in advance, allowing legitimate launches to proceed without delays during execution while blocking unauthorized launches before they consume resources.
Solution Approach 2:
The patent replaces traditional mechanical process launch mechanisms with a constraint-based evaluation system. Instead of relying solely on parent-child process relationships and environment inheritance, the system uses explicit constraint checking that can be evaluated efficiently by the kernel without requiring complex mechanical coordination.
3Adaptability or versatility
If environment inheritance is allowed, then process functionality is improved, but security vulnerabilities increase
Solution Approach 1:
The kernel acts as an intermediary between the parent process environment and the child process. Instead of directly inheriting the parent's environment, the child process receives a filtered and validated environment through the kernel's constraint enforcement mechanism. This intermediary role allows necessary environment passing while blocking malicious manipulations.
Solution Approach 2:
Different aspects of environment inheritance are treated differently based on their security implications. The system allows beneficial environment variables and settings to be inherited while blocking potentially harmful elements. This selective approach maintains process functionality where safe while preventing security vulnerabilities.
Data Source
AI summary
A kernel of an operating system receives a request from a parent process (e.g., an exec or spawn system call) to launch a child process that executes a binary. The kernel identifies a process-specific launch constraint, which is a precondition for launching the child process. The kernel evaluates the constraint, which can match against any type of system state or variable, including the process's location on disk, protection on disk, and how the process is to be launched. The kernel can then determine whether to launch the child process, thus permitting the child process to be scheduled for execution by the operating system. Launch constraints can be used both for a child process to impose preconditions on the parent process, and vice versa. Launch constraints can be included in the launch request, embedded in the binary, or located elsewhere, such as in a trust cache in kernel memory.