Add SEEK_MAX and use it to validate lseek arguments from userspace.
Signed-off-by: NChris Snook <csnook@redhat.com>
Acked-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>