#VU96884 Improper neutralization of directives in statically saved code (\'static code injection\') in Linux kernel - CVE-2024-44949

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

In the Linux kernel, the following vulnerability has been resolved: parisc: fix a possible DMA corruption ARCH_DMA_MINALIGN was defined as 16 - this is too small - it may be possible that 2 unrelated 16-byte allocations share a cache line. If 1 of these allocations is written using DMA and the other is written using cached write, the value that was written with DMA may be corrupted. This commit changes ARCH_DMA_MINALIGN to be 128 on PA20 and 32 on PA1.1 - that is the largest possible cache line size. As different parisc microarchitectures have different cache line size, we define arch_slab_minalign(), cache_line_size() and dma_get_cache_alignment() so that the kernel may tune slab cache parameters dynamically, based on the detected cache line size.

Remediation

External links

• https://git.kernel.org/stable/c/642a0b7453daff0295310774016fcb56d1f5bc7f
• https://git.kernel.org/stable/c/533de2f470baac40d3bf622fe631f15231a03c9f
• https://git.kernel.org/stable/c/7ae04ba36b381bffe2471eff3a93edced843240f
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.174
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.175
• https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.119
• https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.10.5
• https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.11
• https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.46