摘要:

In the Linux kernel, the following vulnerability has been resolved:iommu: Don t reserve 0-length IOVA regionWhen the bootloader/firmware doesn t setup the framebuffers, theiraddress and size are 0 in iommu-addresses property. If IOVA region isreserved with 0 length, then it ends up corrupting the IOVA rbtree withan entry which has pfn_hi < pfn_lo.If we intend to use display driver in kernel without framebuffer thenit s causing the display IOMMU mappings to fail as entire valid IOVAspace is reserved when address and length are passed as 0.An ideal solution would be firmware removing the iommu-addresses property and corresponding memory-region if display is not present.But the kernel should be able to handle this by checking for size ofIOVA region and skipping the IOVA reservation if size is 0. Also, adda warning if firmware is requesting 0-length IOVA region reservation.

安全等级: Low

公告ID: KylinSec-SA-2024-2242

发布日期: 2024年5月27日

关联CVE: CVE-2023-52455