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    Subject[Patch 5/7] integrity: mtime patch for mmap files
    mmaped files are hashed and hmac'ed properly by EVM after being modified
    when the file's mtime is updated correctly. Peter Staubach's 'memory
    mapped files not updating timestamps v2' patch properly updates the
    mmapped file's mtime. In those cases when an application does not
    first msync the file before calling munmap, the mtime is eventually
    updated, but not before file_close is called. This patch forces the
    mtime for mmaped files to be updated in a timely manner.

    signed-off-by: Mimi Zohar <>
    Index: linux-2.6.21-rc4-mm1/mm/mmap.c
    --- linux-2.6.21-rc4-mm1.orig/mm/mmap.c
    +++ linux-2.6.21-rc4-mm1/mm/mmap.c
    @@ -1790,6 +1790,7 @@ int do_munmap(struct mm_struct *mm, unsi
    unsigned long end;
    struct vm_area_struct *vma, *prev, *last;
    + struct file *file;

    if ((start & ~PAGE_MASK) || start > TASK_SIZE || len > TASK_SIZE-start)
    return -EINVAL;
    @@ -1808,6 +1809,10 @@ int do_munmap(struct mm_struct *mm, unsi
    if (vma->vm_start >= end)
    return 0;

    + file = vma->vm_file;
    + if (file && test_and_clear_bit(AS_MCTIME, &file->f_mapping->flags))
    + file_update_time(file);
    * If we need to split any vma, do it now to save pain later.

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      Last update: 2007-03-23 17:17    [W:0.021 / U:2.636 seconds]
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