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    Subject[patch 18/88] x86, PAT, PCI: Change vma prot in pci_mmap to reflect inherited prot
    2.6.28-stable review patch.  If anyone has any objections, please let us know.


    From: Venkatesh Pallipadi <>

    upstream commit: 9cdec049389ce2c324fd1ec508a71528a27d4a07

    While looking at the issue in the thread:

    noticed a bug in pci PAT code and memory type setting.

    PCI mmap code did not set the proper protection in vma, when it
    inherited protection in reserve_memtype. This bug only affects
    the case where there exists a WC mapping before X does an mmap
    with /proc or /sys pci interface. This will cause X userlevel
    mmap from /proc or /sysfs to fail on fork.

    Reported-by: Kevin Winchester <>
    Signed-off-by: Venkatesh Pallipadi <>
    Signed-off-by: Suresh Siddha <>
    Cc: Jesse Barnes <>
    Cc: Dave Airlie <>
    LKML-Reference: <>
    Signed-off-by: Ingo Molnar <>
    Signed-off-by: Chris Wright <>
    Signed-off-by: Greg Kroah-Hartman <>
    arch/x86/pci/i386.c | 3 +++
    1 file changed, 3 insertions(+)

    --- a/arch/x86/pci/i386.c
    +++ b/arch/x86/pci/i386.c
    @@ -329,6 +329,9 @@ int pci_mmap_page_range(struct pci_dev *
    return -EINVAL;
    flags = new_flags;
    + vma->vm_page_prot = __pgprot(
    + (pgprot_val(vma->vm_page_prot) & ~_PAGE_CACHE_MASK) |
    + flags);

    if (((vma->vm_pgoff < max_low_pfn_mapped) ||

     \ /
      Last update: 2009-04-30 19:17    [W:0.020 / U:2.180 seconds]
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