CVE-2024-44949 Information

Description

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 two unrelated 16-byte allocations share a cache line. If one 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’s 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.

Reference

https://git.kernel.org/stable/c/642a0b7453daff0295310774016fcb56d1f5bc7f https://git.kernel.org/stable/c/533de2f470baac40d3bf622fe631f15231a03c9f https://git.kernel.org/stable/c/7ae04ba36b381bffe2471eff3a93edced843240f