From: Esther Shimanovich eshimanovich@chromium.org
[ Upstream commit 3b96b895127b7c0aed63d82c974b46340e8466c1 ]
Some computers with CPUs that lack Thunderbolt features use discrete Thunderbolt chips to add Thunderbolt functionality. These Thunderbolt chips are located within the chassis; between the Root Port labeled ExternalFacingPort and the USB-C port.
These Thunderbolt PCIe devices should be labeled as fixed and trusted, as they are built into the computer. Otherwise, security policies that rely on those flags may have unintended results, such as preventing USB-C ports from enumerating.
Detect the above scenario through the process of elimination.
1) Integrated Thunderbolt host controllers already have Thunderbolt implemented, so anything outside their external facing Root Port is removable and untrusted.
Detect them using the following properties:
- Most integrated host controllers have the "usb4-host-interface" ACPI property, as described here:
https://learn.microsoft.com/en-us/windows-hardware/drivers/pci/dsd-for-pcie-...
- Integrated Thunderbolt PCIe Root Ports before Alder Lake do not have the "usb4-host-interface" ACPI property. Identify those by their PCI IDs instead.
2) If a Root Port does not have integrated Thunderbolt capabilities, but has the "ExternalFacingPort" ACPI property, that means the manufacturer has opted to use a discrete Thunderbolt host controller that is built into the computer.
This host controller can be identified by virtue of being located directly below an external-facing Root Port that lacks integrated Thunderbolt. Label it as trusted and fixed.
Everything downstream from it is untrusted and removable.
The "ExternalFacingPort" ACPI property is described here: https://learn.microsoft.com/en-us/windows-hardware/drivers/pci/dsd-for-pcie-...
Link: https://lore.kernel.org/r/20240910-trust-tbt-fix-v5-1-7a7a42a5f496@chromium.... Suggested-by: Mika Westerberg mika.westerberg@linux.intel.com Signed-off-by: Esther Shimanovich eshimanovich@chromium.org Signed-off-by: Bjorn Helgaas bhelgaas@google.com Tested-by: Mika Westerberg mika.westerberg@linux.intel.com Tested-by: Mario Limonciello mario.limonciello@amd.com Reviewed-by: Mika Westerberg mika.westerberg@linux.intel.com Reviewed-by: Mario Limonciello mario.limonciello@amd.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/x86/pci/acpi.c | 119 ++++++++++++++++++++++++++++++++++++++++++++ drivers/pci/probe.c | 30 ++++++++--- include/linux/pci.h | 6 +++ 3 files changed, 148 insertions(+), 7 deletions(-)
diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c index 55c4b07ec1f63..0c316bae1726e 100644 --- a/arch/x86/pci/acpi.c +++ b/arch/x86/pci/acpi.c @@ -250,6 +250,125 @@ void __init pci_acpi_crs_quirks(void) pr_info("Please notify linux-pci@vger.kernel.org so future kernels can do this automatically\n"); }
+/* + * Check if pdev is part of a PCIe switch that is directly below the + * specified bridge. + */ +static bool pcie_switch_directly_under(struct pci_dev *bridge, + struct pci_dev *pdev) +{ + struct pci_dev *parent = pci_upstream_bridge(pdev); + + /* If the device doesn't have a parent, it's not under anything */ + if (!parent) + return false; + + /* + * If the device has a PCIe type, check if it is below the + * corresponding PCIe switch components (if applicable). Then check + * if its upstream port is directly beneath the specified bridge. + */ + switch (pci_pcie_type(pdev)) { + case PCI_EXP_TYPE_UPSTREAM: + return parent == bridge; + + case PCI_EXP_TYPE_DOWNSTREAM: + if (pci_pcie_type(parent) != PCI_EXP_TYPE_UPSTREAM) + return false; + parent = pci_upstream_bridge(parent); + return parent == bridge; + + case PCI_EXP_TYPE_ENDPOINT: + if (pci_pcie_type(parent) != PCI_EXP_TYPE_DOWNSTREAM) + return false; + parent = pci_upstream_bridge(parent); + if (!parent || pci_pcie_type(parent) != PCI_EXP_TYPE_UPSTREAM) + return false; + parent = pci_upstream_bridge(parent); + return parent == bridge; + } + + return false; +} + +static bool pcie_has_usb4_host_interface(struct pci_dev *pdev) +{ + struct fwnode_handle *fwnode; + + /* + * For USB4, the tunneled PCIe Root or Downstream Ports are marked + * with the "usb4-host-interface" ACPI property, so we look for + * that first. This should cover most cases. + */ + fwnode = fwnode_find_reference(dev_fwnode(&pdev->dev), + "usb4-host-interface", 0); + if (!IS_ERR(fwnode)) { + fwnode_handle_put(fwnode); + return true; + } + + /* + * Any integrated Thunderbolt 3/4 PCIe Root Ports from Intel + * before Alder Lake do not have the "usb4-host-interface" + * property so we use their PCI IDs instead. All these are + * tunneled. This list is not expected to grow. + */ + if (pdev->vendor == PCI_VENDOR_ID_INTEL) { + switch (pdev->device) { + /* Ice Lake Thunderbolt 3 PCIe Root Ports */ + case 0x8a1d: + case 0x8a1f: + case 0x8a21: + case 0x8a23: + /* Tiger Lake-LP Thunderbolt 4 PCIe Root Ports */ + case 0x9a23: + case 0x9a25: + case 0x9a27: + case 0x9a29: + /* Tiger Lake-H Thunderbolt 4 PCIe Root Ports */ + case 0x9a2b: + case 0x9a2d: + case 0x9a2f: + case 0x9a31: + return true; + } + } + + return false; +} + +bool arch_pci_dev_is_removable(struct pci_dev *pdev) +{ + struct pci_dev *parent, *root; + + /* pdev without a parent or Root Port is never tunneled */ + parent = pci_upstream_bridge(pdev); + if (!parent) + return false; + root = pcie_find_root_port(pdev); + if (!root) + return false; + + /* Internal PCIe devices are not tunneled */ + if (!root->external_facing) + return false; + + /* Anything directly behind a "usb4-host-interface" is tunneled */ + if (pcie_has_usb4_host_interface(parent)) + return true; + + /* + * Check if this is a discrete Thunderbolt/USB4 controller that is + * directly behind the non-USB4 PCIe Root Port marked as + * "ExternalFacingPort". Those are not behind a PCIe tunnel. + */ + if (pcie_switch_directly_under(root, pdev)) + return false; + + /* PCIe devices after the discrete chip are tunneled */ + return true; +} + #ifdef CONFIG_PCI_MMCONFIG static int check_segment(u16 seg, struct device *dev, char *estr) { diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index d203e23b75620..6f5e4fa854f78 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1631,23 +1631,33 @@ static void set_pcie_thunderbolt(struct pci_dev *dev)
static void set_pcie_untrusted(struct pci_dev *dev) { - struct pci_dev *parent; + struct pci_dev *parent = pci_upstream_bridge(dev);
+ if (!parent) + return; /* - * If the upstream bridge is untrusted we treat this device + * If the upstream bridge is untrusted we treat this device as * untrusted as well. */ - parent = pci_upstream_bridge(dev); - if (parent && (parent->untrusted || parent->external_facing)) + if (parent->untrusted) { + dev->untrusted = true; + return; + } + + if (arch_pci_dev_is_removable(dev)) { + pci_dbg(dev, "marking as untrusted\n"); dev->untrusted = true; + } }
static void pci_set_removable(struct pci_dev *dev) { struct pci_dev *parent = pci_upstream_bridge(dev);
+ if (!parent) + return; /* - * We (only) consider everything downstream from an external_facing + * We (only) consider everything tunneled below an external_facing * device to be removable by the user. We're mainly concerned with * consumer platforms with user accessible thunderbolt ports that are * vulnerable to DMA attacks, and we expect those ports to be marked by @@ -1657,9 +1667,15 @@ static void pci_set_removable(struct pci_dev *dev) * accessible to user / may not be removed by end user, and thus not * exposed as "removable" to userspace. */ - if (parent && - (parent->external_facing || dev_is_removable(&parent->dev))) + if (dev_is_removable(&parent->dev)) { + dev_set_removable(&dev->dev, DEVICE_REMOVABLE); + return; + } + + if (arch_pci_dev_is_removable(dev)) { + pci_dbg(dev, "marking as removable\n"); dev_set_removable(&dev->dev, DEVICE_REMOVABLE); + } }
/** diff --git a/include/linux/pci.h b/include/linux/pci.h index 37d97bef060f9..3eea098a47865 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -2602,6 +2602,12 @@ pci_host_bridge_acpi_msi_domain(struct pci_bus *bus) { return NULL; } static inline bool pci_pr3_present(struct pci_dev *pdev) { return false; } #endif
+#if defined(CONFIG_X86) && defined(CONFIG_ACPI) +bool arch_pci_dev_is_removable(struct pci_dev *pdev); +#else +static inline bool arch_pci_dev_is_removable(struct pci_dev *pdev) { return false; } +#endif + #ifdef CONFIG_EEH static inline struct eeh_dev *pci_dev_to_eeh_dev(struct pci_dev *pdev) {