Description
In the Linux kernel, the following vulnerability has been resolved: PCI: dwc: ep: Prevent changing BAR size/flags in pci_epc_set_bar() In commit 4284c88fff0e ("PCI: designware-ep: Allow pci_epc_set_bar() update inbound map address") set_bar() was modified to support dynamically changing the backing physical address of a BAR that was already configured. This means that set_bar() can be called twice, without ever calling clear_bar() (as calling clear_bar() would clear the BAR's PCI address assigned by the host). This can only be done if the new BAR size/flags does not differ from the existing BAR configuration. Add these missing checks. If we allow set_bar() to set e.g. a new BAR size that differs from the existing BAR size, the new address translation range will be smaller than the BAR size already determined by the host, which would mean that a read past the new BAR size would pass the iATU untranslated, which could allow the host to read memory not belonging to the new struct pci_epf_bar. While at it, add comments which clarifies the support for dynamically changing the physical address of a BAR. (Which was also missing.)
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
4284c88fff0efc4e418abb53d78e02dc4f099d6c to < 01aaa7935af3050fd1e1e7de50001247c75baeabaffected4284c88fff0efc4e418abb53d78e02dc4f099d6c to < b5cacfd067060c75088363ed3e19779078be2755affected4284c88fff0efc4e418abb53d78e02dc4f099d6c to < 3229c15d6267de8e704b4085df8a82a5af2d63ebaffected4284c88fff0efc4e418abb53d78e02dc4f099d6c to < 3708acbd5f169ebafe1faa519cb28adc56295546affected
Linux Linux
Default version status: affected
6.0affected0 to < 6.0unaffected6.6.160 to ≤ 6.6.*unaffected6.12.14 to ≤ 6.12.*unaffected6.13.3 to ≤ 6.13.*unaffected6.14 to ≤ *unaffected