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| author | Ingo Molnar <mingo@elte.hu> | 2008-10-10 09:25:29 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-10-10 09:25:29 +0200 |
| commit | 8eb95f28f66b1a5461fdbcc9a1ee9068fb2cf2b6 (patch) | |
| tree | e42d0e004b07f86d38de930fc163f3ca7d121f9c /drivers/pci/pci-sysfs.c | |
| parent | d7451fca18e2ec62641ae4bbfe946069f13765a3 (diff) | |
| parent | 3fa8749e584b55f1180411ab1b51117190bac1e5 (diff) | |
Merge commit 'v2.6.27' into timers/hpet
Diffstat (limited to 'drivers/pci/pci-sysfs.c')
| -rw-r--r-- | drivers/pci/pci-sysfs.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index 9c718583a23..77baff022f7 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -16,6 +16,7 @@ #include <linux/kernel.h> +#include <linux/sched.h> #include <linux/pci.h> #include <linux/stat.h> #include <linux/topology.h> @@ -484,6 +485,21 @@ pci_mmap_legacy_mem(struct kobject *kobj, struct bin_attribute *attr, #endif /* HAVE_PCI_LEGACY */ #ifdef HAVE_PCI_MMAP + +static int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma) +{ + unsigned long nr, start, size; + + nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; + start = vma->vm_pgoff; + size = pci_resource_len(pdev, resno) >> PAGE_SHIFT; + if (start < size && size - start >= nr) + 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; +} + /** * pci_mmap_resource - map a PCI resource into user memory space * @kobj: kobject for mapping @@ -510,6 +526,9 @@ pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr, if (i >= PCI_ROM_RESOURCE) return -ENODEV; + if (!pci_mmap_fits(pdev, i, vma)) + 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 * different from the resource itself, arch will do necessary fixup. |