CVE-2024-58006

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.)

• https://git.kernel.org/stable/c/3229c15d6267de8e704b4085df8a82a5af2d63ebPatch
• https://git.kernel.org/stable/c/3708acbd5f169ebafe1faa519cb28adc56295546Patch
• https://git.kernel.org/stable/c/b5cacfd067060c75088363ed3e19779078be2755Patch

Published

Feb 27, 2025

Last Modified

Aug 4, 2026

Status

Modified

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