جزئیات آسیب‌پذیری

In the Linux kernel, the following vulnerability has been resolved: iommu/arm-smmu-v3-iommufd: Require exactly one Stream ID for a vDEVICE arm_vsmmu_vsid_to_sid() maps a guest's vSID to a single physical Stream ID taken from master->streams[0], assuming a device has exactly one stream. A device with several streams gets only its first one mapped, so a guest vSID invalidation cannot reach the others' ATC and IOTLB entries; a device with none makes master->streams a ZERO_SIZE_PTR, read out of bounds. Add an arm_vsmmu_vdevice_init() op to reject the vDEVICE with -EOPNOTSUPP when master->num_streams is not one, rather than mapping it silently.

• https://git.kernel.org/stable/c/3808bab5d95ae79e333e11f6a73d178e084c645d
• https://git.kernel.org/stable/c/0acbc621341aca4eb94d9c2f43e1ab273ff088f0
• https://git.kernel.org/stable/c/c3b8ee84a965058b41275069d4696f37a8b14bf6