On Mon, 2014-11-03 at 16:06 -0800, Dave Hansen wrote: > From: Dave Hansen <[email protected]> > > This is a highly-contrived scenario. But, a single shmdt() call > can be induced in to unmapping memory from mulitple shm segments. > Example code is here: > > http://www.sr71.net/~dave/intel/shmfun.c > > The fix is pretty simple: Record the 'struct file' for the first > VMA we encounter and then stick to it. Decline to unmap anything > not from the same file and thus the same segment. > > I found this by inspection and the odds of anyone hitting this in > practice are pretty darn small. > > Lightly tested, but it's a pretty small patch.
Passed shmdt ltp tests, fwiw. > Signed-off-by: Dave Hansen <[email protected]> Reviewed-by: Davidlohr Bueso <[email protected]> -- 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/
