Messages in this thread Patch in this message | | | From | Seunggyun Lee <> | Subject | [PATCH] pci/mmap: add pci device EBUSY check | Date | Tue, 7 Feb 2023 20:39:49 +0900 |
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When using a pci device through the vfio-pci driver, other software was also able to access the pci device memory through sysfs.
To prevent this, when mmap is performed through sysfs, a process of checking whether the device is in use is added.
Signed-off-by: Seunggyun Lee <sglee97@dankook.ac.kr> --- drivers/pci/mmap.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/pci/mmap.c b/drivers/pci/mmap.c index 4504039056d1..4c9df2e23e03 100644 --- a/drivers/pci/mmap.c +++ b/drivers/pci/mmap.c @@ -25,6 +25,8 @@ int pci_mmap_resource_range(struct pci_dev *pdev, int bar, { unsigned long size; int ret; + if (pdev->driver) + return -1; size = ((pci_resource_len(pdev, bar) - 1) >> PAGE_SHIFT) + 1; if (vma->vm_pgoff + vma_pages(vma) > size) -- 2.25.1
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