Vulnerability in Linux Kernel: mmc: jz4740: Apply DMA engine limits to maximum segment size
Summary
GSD-2022-1003774: mmc: jz4740: Apply DMA engine limits to maximum segment size. Affects Kernel versions < 7923f95997a79cef2ad161a2facae64c25a0bca0. No fix is published. How to fix ↓
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Background
The Linux Kernel is a widely used open-source operating system kernel that serves as the foundation for various Linux distributions. It provides essential functionality for managing hardware resources, memory, and system processes. The mmc (MultiMediaCard) subsystem within the Linux Kernel is responsible for handling communication with SD and MMC storage devices.
The vulnerability identified in the mmc subsystem affects the jz4740 driver. This driver is specific to the Ingenic JZ4740 SoC (System-on-Chip) family, commonly used in embedded systems. The vulnerability relates to the handling of DMA (Direct Memory Access) operations and the maximum segment size.
DMA operations allow data to be transferred directly between devices and memory without involving the CPU. However, if not properly controlled, DMA operations can lead to security vulnerabilities, such as buffer overflows or data corruption. This vulnerability specifically impacts the maximum segment size used by the DMA engine in the jz4740 driver.
Vulnerability Detail
The vulnerability arises from a failure to apply DMA engine limits to the maximum segment size in the jz4740 driver of the Linux Kernel's mmc subsystem. By exploiting this vulnerability, an attacker could potentially manipulate DMA operations to exceed the intended segment size, leading to buffer overflows or data corruption. The exact impact and attack plausibility have not been proven yet.
It is important to note that this vulnerability has been addressed in the Linux Kernel version v5.4.198 by commit 7923f95997a79cef2ad161a2facae64c25a0bca0. Upgrading to this version or any subsequent version that includes the mentioned commit will mitigate the vulnerability.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As this vulnerability has been fixed in the Linux Kernel, there is no specific workaround available. The recommended course of action is to upgrade to the patched version of the Linux Kernel.
Conclusion
The vulnerability in the Linux Kernel's mmc subsystem, specifically in the jz4740 driver, has been addressed in version v5.4.198 and later versions. Upgrading to the patched version of the Linux Kernel is the recommended solution. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The Linux Kernel is an open-source operating system kernel that forms the core of various Linux distributions. It provides essential functionality for managing hardware resources, memory, and system processes.
The mmc (MultiMediaCard) subsystem is responsible for handling communication with SD and MMC storage devices in the Linux Kernel. It provides the necessary drivers and protocols for interacting with these storage devices.
The jz4740 driver is specific to the Ingenic JZ4740 SoC (System-on-Chip) family, commonly used in embedded systems. It enables communication between the Linux Kernel and the hardware components of devices based on the Ingenic JZ4740 SoC.
DMA (Direct Memory Access) operations allow data to be transferred directly between devices and memory without involving the CPU. This can improve performance by offloading data transfer tasks from the CPU.
If exploited, this vulnerability could lead to buffer overflows or data corruption. However, the exact impact and attack plausibility have not been proven yet.
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