drivers: char: mem: Check for address space wraparound with mmap()

commit b299cde245b0b76c977f4291162cf668e087b408 upstream.

/dev/mem currently allows mmap() mappings that wrap around the end of
the physical address space, which should probably be illegal. It
circumvents the existing STRICT_DEVMEM permission check because the loop
immediately terminates (as the start address is already higher than the
end address). On the x86_64 architecture it will then cause a panic
(from the BUG(start >= end) in arch/x86/mm/pat.c:reserve_memtype()).

This patch adds an explicit check to make sure offset + size will not
wrap around in the physical address type.

Signed-off-by: Julius Werner <jwerner@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index b1ac8d4..1c8cfa6 100644 (file)
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -322,6 +322,11 @@ static const struct vm_operations_struct mmap_mem_ops = {
 static int mmap_mem(struct file *file, struct vm_area_struct *vma)
 {
        size_t size = vma->vm_end - vma->vm_start;
+       phys_addr_t offset = (phys_addr_t)vma->vm_pgoff << PAGE_SHIFT;
+
+       /* It's illegal to wrap around the end of the physical address space. */
+       if (offset + (phys_addr_t)size < offset)
+               return -EINVAL;
 
        if (!valid_mmap_phys_addr_range(vma->vm_pgoff, size))
                return -EINVAL;