With Chris Wright <chrisw@osdl.org>

struct task_struct.comm is defined to be 16 chars, but
arch/x86_64/sys_ia32.c:sys32_ni_syscall() and sys32_vm86_warning() copy it
into a static 8 byte buffer, which will surely cause problems.  This patch
makes lastcomm[] the right size, and makes sure it can't be overrun.  Since
the code also goes to the effort of getting a local copy of current in "me",
we may as well use it for printing the message.
Signed-off-by: Chris Wright <chrisw@osdl.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>