[PATCH 0/4] return EINVAL for illegal user memory range

[Wupeng Ma]

From: Ma Wupeng <mawupeng1@xxxxxxxxxx>

While testing mlock, we have a problem if the len of mlock is ULONG_MAX.
The return value of mlock is zero. But nothing will be locked since the
len in do_mlock overflows to zero due to the following code in mlock:

  len = PAGE_ALIGN(len + (offset_in_page(start)));

However this problem appear in multiple syscalls.

Since TASK_SIZE is the maximum user space address. The start or len of
mlock shouldn't be bigger than this. Function access_ok can be used to
check this issue, so return -EINVAL if bigger.

Ma Wupeng (4):
  mm/mlock: return EINVAL for illegal user memory range in mlock
  mm/mempolicy: return EINVAL for illegal user memory range for
    set_mempolicy_home_node
  mm/mempolicy: return EINVAL for illegal user memory range for mbind
  mm/msync: return EINVAL for illegal user memory range for msync

 mm/mempolicy.c | 7 +++++++
 mm/mlock.c     | 6 ++++++
 mm/msync.c     | 2 ++
 3 files changed, 15 insertions(+)

-- 
2.25.1