Messages in this thread Patch in this message | | | Subject | [Patch 5/7] integrity: mtime patch for mmap files | From | Mimi Zohar <> | Date | Fri, 23 Mar 2007 12:09:58 -0400 |
| |
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 <zohar@us.ibm.com> ---- 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. *
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |