Vulnerability in Kernel: objtool: Mark __ubsan_handle_builtin_unreachable() as noreturn
Summary
GSD-2022-1002540: objtool: Mark __ubsan_handle_builtin_unreachable() as noreturn. Affects Kernel versions < b5cd416def441befd75c39bfa516a4eb4b3c7ff9. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that provides core functionality and interfaces with hardware devices. It is responsible for managing system resources, executing processes, and facilitating communication between software and hardware. The vulnerability in question affects the objtool utility within the Kernel. objtool is a tool used for validating and analyzing object files generated during the compilation process. It ensures that the object files adhere to certain rules and guidelines, improving code quality and security. However, a flaw in objtool allows an attacker to exploit the __ubsan_handle_builtin_unreachable() function, potentially leading to security breaches and unauthorized access to sensitive information.
Vulnerability Detail
The vulnerability arises from the failure to mark the __ubsan_handle_builtin_unreachable() function as noreturn. This attribute informs the compiler that the function does not return control to the caller. Without this attribute, the compiler may generate incorrect code optimizations, resulting in potential security vulnerabilities. An attacker could leverage this vulnerability to execute arbitrary code or cause a denial-of-service (DoS) condition. The impact and attack plausibility of this vulnerability have not been proven yet, but it is crucial to address it to maintain the security and integrity of the system.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability. However, it is strongly advised to apply the recommended fix by updating the Linux Kernel to the latest version available.
Conclusion
The vulnerability in the Kernel's objtool utility poses a potential security risk, allowing attackers to exploit the __ubsan_handle_builtin_unreachable() function. To mitigate this vulnerability, it is crucial to update the Linux Kernel to version v5.18.4 or later. This update includes the necessary fix to mark the function as noreturn, preventing potential code optimizations that could lead to security breaches. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The Kernel is a critical component of the Linux operating system that provides core functionality and interfaces with hardware devices. It manages system resources, executes processes, and facilitates communication between software and hardware.
objtool is a utility within the Kernel used for validating and analyzing object files generated during the compilation process. It ensures that the object files adhere to certain rules and guidelines, improving code quality and security.
__ubsan_handle_builtin_unreachable() is a function within objtool that handles built-in unreachable code. It is called when the compiler detects code that is guaranteed to be unreachable during execution.
If exploited, this vulnerability could allow an attacker to execute arbitrary code or cause a denial-of-service (DoS) condition. However, the actual impact and attack plausibility have not been proven yet.
To protect your system, it is recommended to update the Linux Kernel to version v5.18.4 or later. This update includes the necessary fix to address the vulnerability.
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