PCI: fix size checks for mmap() on /proc/bus/pci files

commit 3b519e4ea618b6943a82931630872907f9ac2c2b upstream.

The checks for valid mmaps of PCI resources made through /proc/bus/pci files
that were introduced in 9eff02e2042f96fb2aedd02e032eca1c5333d767 have several
problems:

1. mmap() calls on /proc/bus/pci files are made with real file offsets > 0,
whereas under /sys/bus/pci/devices, the start of the resource corresponds
to offset 0. This may lead to false negatives in pci_mmap_fits(), which
implicitly assumes the /sys/bus/pci/devices layout.

2. The loop in proc_bus_pci_mmap doesn't skip empty resouces. This leads
to false positives, because pci_mmap_fits() doesn't treat empty resources
correctly (the calculated size is 1 << (8*sizeof(resource_size_t)-PAGE_SHIFT)
in this case!).

3. If a user maps resources with BAR > 0, pci_mmap_fits will emit bogus
WARNINGS for the first resources that don't fit until the correct one is found.

On many controllers the first 2-4 BARs are used, and the others are empty.
In this case, an mmap attempt will first fail on the non-empty BARs
(including the "right" BAR because of 1.) and emit bogus WARNINGS because
of 3., and finally succeed on the first empty BAR because of 2.
This is certainly not the intended behaviour.

This patch addresses all 3 issues.
Updated with an enum type for the additional parameter for pci_mmap_fits().

Signed-off-by: Martin Wilck <martin.wilck@ts.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index b5a7d9bfcb24a70523a33793e60d217475fc9a91..25accc9dda3b983625b1d2725347e219efd2c2fc 100644 (file)
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -705,17 +705,21 @@ void pci_remove_legacy_files(struct pci_bus *b)
 
 #ifdef HAVE_PCI_MMAP
 
-int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma)
+int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
+                 enum pci_mmap_api mmap_api)
 {
-       unsigned long nr, start, size;
+       unsigned long nr, start, size, pci_start;
 
+       if (pci_resource_len(pdev, resno) == 0)
+               return 0;
        nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
        start = vma->vm_pgoff;
        size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
-       if (start < size && size - start >= nr)
+       pci_start = (mmap_api == PCI_MMAP_SYSFS) ?
+                       pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
+       if (start >= pci_start && start < pci_start + size &&
+                       start + nr <= pci_start + size)
                return 1;
-       WARN(1, "process \"%s\" tried to map 0x%08lx-0x%08lx on %s BAR %d (size 0x%08lx)\n",
-               current->comm, start, start+nr, pci_name(pdev), resno, size);
        return 0;
 }
 
@@ -745,8 +749,14 @@ pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
        if (i >= PCI_ROM_RESOURCE)
                return -ENODEV;
 
-       if (!pci_mmap_fits(pdev, i, vma))
+       if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
+               WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
+                       "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
+                       current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
+                       pci_name(pdev), i,
+                       pci_resource_start(pdev, i), pci_resource_len(pdev, i));
                return -EINVAL;
+       }
 
        /* pci_mmap_page_range() expects the same kind of entry as coming
         * from /proc/bus/pci/ which is a "user visible" value. If this is

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 6beb11b617a92973f7a32cc47a7343a759218d6e..1001b1d7e0416a9352520933f824e1155f5c5457 100644 (file)
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -22,8 +22,13 @@ extern void pci_remove_firmware_label_files(struct pci_dev *pdev);
 #endif
 extern void pci_cleanup_rom(struct pci_dev *dev);
 #ifdef HAVE_PCI_MMAP
+enum pci_mmap_api {
+       PCI_MMAP_SYSFS, /* mmap on /sys/bus/pci/devices/<BDF>/resource<N> */
+       PCI_MMAP_PROCFS /* mmap on /proc/bus/pci/<BDF> */
+};
 extern int pci_mmap_fits(struct pci_dev *pdev, int resno,
-                        struct vm_area_struct *vma);
+                        struct vm_area_struct *vmai,
+                        enum pci_mmap_api mmap_api);
 #endif
 int pci_probe_reset_function(struct pci_dev *dev);
 

diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c
index 01f0306525a504a7ed2a9f954f7376e06170c57e..4aae016c79d011c475dfc9a739f05734d5ca3fb2 100644 (file)
--- a/drivers/pci/proc.c
+++ b/drivers/pci/proc.c
@@ -260,7 +260,7 @@ static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
 
        /* Make sure the caller is mapping a real resource for this device */
        for (i = 0; i < PCI_ROM_RESOURCE; i++) {
-               if (pci_mmap_fits(dev, i, vma))
+               if (pci_mmap_fits(dev, i, vma,  PCI_MMAP_PROCFS))
                        break;
        }