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.

Affected Products 3

References 5

• git.kernel.org https://git.kernel.org/stable/c/00baca74fb5879e5f9034b6156671301f500f8ee
• git.kernel.org https://git.kernel.org/stable/c/533de2f470baac40d3bf622fe631f15231a03c9f
  Patch
• git.kernel.org https://git.kernel.org/stable/c/642a0b7453daff0295310774016fcb56d1f5bc7f
  Patch
• git.kernel.org https://git.kernel.org/stable/c/7ae04ba36b381bffe2471eff3a93edced843240f
  Patch
• lists.debian.org https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

Remediation

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