3.8.13.27 -stable review patch. If anyone has any objections, please let me know.
------------------ From: Bin Wang <[email protected]> commit ddb09754e6c7239e302c7b675df9bbd415f8de5d upstream. the vma range size is always page size aligned in mmap, while the real io space range may not be page aligned, thus leading to range check failure in the uio_mmap_physical(). for example, in a case of io range size "mem->size == 1KB", and we have (vma->vm_end - vma->vm_start) == 4KB, due to "len" is aligned to page size in do_mmap_pgoff(). now fix this issue by align mem->size to page size in the check. Signed-off-by: Bin Wang <[email protected]> Signed-off-by: Nobuhiro Iwamatsu <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> Signed-off-by: Kamal Mostafa <[email protected]> --- drivers/uio/uio.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c index 9981b9b..354c095 100644 --- a/drivers/uio/uio.c +++ b/drivers/uio/uio.c @@ -657,7 +657,7 @@ static int uio_mmap_physical(struct vm_area_struct *vma) if (mem->addr & ~PAGE_MASK) return -ENODEV; - if (vma->vm_end - vma->vm_start > mem->size) + if (vma->vm_end - vma->vm_start > PAGE_ALIGN(mem->size)) return -EINVAL; vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
