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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
This commit is contained in:
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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7
arch/alpha/kernel/pci-sysfs.c
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@@ -11,6 +11,7 @@
*/
#include <linux/sched.h>
#include <linux/security.h>
#include <linux/stat.h>
#include <linux/slab.h>
#include <linux/pci.h>
@@ -71,7 +72,11 @@ static int pci_mmap_resource(struct kobject *kobj,
struct resource *res = attr->private;
enum pci_mmap_state mmap_type;
struct pci_bus_region bar;
int i;
int i, ret;
ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
if (ret)
return ret;
for (i = 0; i < PCI_STD_NUM_BARS; i++)
if (res == &pdev->resource[i])