powerpc64/bpf: Limit 'ldbrx' to processors compliant with ISA v2.06
Summary
GSD-2022-1000198: powerpc64/bpf: Limit 'ldbrx' to processors compliant with ISA v2.06. Affects Kernel versions >= 156d0e290e969caba25f1851c52417c14d141b24, < 129c71829d7f46423d95c19e8d87ce956d4c6e1c. No fix is published. How to fix ↓
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Background
The powerpc64/bpf package is a component of the Linux Kernel, which is responsible for handling Berkeley Packet Filter (BPF) instructions on powerpc64 processors. BPF is a virtual machine that allows user-defined programs to be executed in the kernel, primarily used for packet filtering and network analysis. The 'ldbrx' instruction is used to load a doubleword from memory into a register, but it is limited to processors compliant with ISA v2.06.
Vulnerability Detail
The vulnerability in powerpc64/bpf arises from the unrestricted usage of the 'ldbrx' instruction across all powerpc64 processors, regardless of their compliance with ISA v2.06. This can lead to compatibility issues and potential security vulnerabilities on processors that do not support this instruction. An attacker could exploit this vulnerability to execute arbitrary code or cause a denial-of-service condition. The vulnerability was introduced in Linux Kernel version v4.8 and has been fixed in version v5.10.96.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no known workaround for this vulnerability. It is essential to update the Linux Kernel to the fixed version to mitigate the risk.
Conclusion
The powerpc64/bpf vulnerability, which allows unrestricted usage of the 'ldbrx' instruction on all powerpc64 processors, poses a potential security risk. It is crucial to update the Linux Kernel to version v5.10.96 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
powerpc64/bpf is a component of the Linux Kernel that handles Berkeley Packet Filter (BPF) instructions on powerpc64 processors.
The 'ldbrx' instruction is used to load a doubleword from memory into a register.
ISA v2.06 refers to the Instruction Set Architecture version 2.06, which defines the supported instructions and features of powerpc64 processors.
This vulnerability can lead to compatibility issues and potential security vulnerabilities on powerpc64 processors that do not support the 'ldbrx' instruction. Attackers could exploit this vulnerability to execute arbitrary code or cause a denial-of-service condition.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.10.96 or later.
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