CVE-2024-44949

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> parisc: fix a possible DMA corruption<br /> <br /> ARCH_DMA_MINALIGN was defined as 16 - this is too small - it may be<br /> possible that two unrelated 16-byte allocations share a cache line. If<br /> one of these allocations is written using DMA and the other is written<br /> using cached write, the value that was written with DMA may be<br /> corrupted.<br /> <br /> This commit changes ARCH_DMA_MINALIGN to be 128 on PA20 and 32 on PA1.1 -<br /> that&amp;#39;s the largest possible cache line size.<br /> <br /> As different parisc microarchitectures have different cache line size, we<br /> define arch_slab_minalign(), cache_line_size() and<br /> dma_get_cache_alignment() so that the kernel may tune slab cache<br /> parameters dynamically, based on the detected cache line size.