Description
In the Linux kernel, the following vulnerability has been resolved: iommu/s390: Fix memory corruption when using identity domain zpci_get_iommu_ctrs() returns counter information to be reported as part of device statistics; these counters are stored as part of the s390_domain. The problem, however, is that the identity domain is not backed by an s390_domain and so the conversion via to_s390_domain() yields a bad address that is zero'd initially and read on-demand later via a sysfs read. These counters aren't necessary for the identity domain; just return NULL in this case. This issue was discovered via KASAN with reports that look like: BUG: KASAN: global-out-of-bounds in zpci_fmb_enable_device when using the identity domain for a device on s390.
Product status
64af12c6ec3afd7d44bc8b2044eee59f98059087 before 17a58caf3863163c4a84a218a9649be2c8061443
64af12c6ec3afd7d44bc8b2044eee59f98059087 before b3506e9bcc777ed6af2ab631c86a9990ed97b474
6.15
Any version before 6.15
6.16.9
6.17
References
git.kernel.org/...c/17a58caf3863163c4a84a218a9649be2c8061443
git.kernel.org/...c/b3506e9bcc777ed6af2ab631c86a9990ed97b474
