alpha/PCI: Add security_locked_down() check to pci_mmap_resource()

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Currently, Alpha's pci_mmap_resource() does not check
security_locked_down(LOCKDOWN_PCI_ACCESS) before allowing userspace to mmap
PCI BARs.

The generic version has had this check since commit eb627e1772 ("PCI:
Lock down BAR access when the kernel is locked down") to prevent DMA
attacks when the kernel is locked down.

Add the same check to Alpha's pci_mmap_resource().

Fixes: eb627e1772 ("PCI: Lock down BAR access when the kernel is locked down")
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Magnus Lindholm <linmag7@gmail.com>
Tested-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Acked-by: Magnus Lindholm <linmag7@gmail.com>
Link: https://patch.msgid.link/20260508043543.217179-12-kwilczynski@kernel.org

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Krzysztof Wilczyński 2026-05-08 04:35:30 +00:00 • committed by Bjorn Helgaas

parent 4eee7eef23

commit 78a228f0aa

1 changed files with 6 additions and 1 deletions

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arch/alpha/kernel/pci-sysfs.c

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