s390/kvm: fix deadlock when killed by oom

commit 306d6c49ac9ded11114cb53b0925da52f2c2ada1 upstream.

When the oom killer kills a userspace process in the page fault handler
while in guest context, the fault handler fails to release the mm_sem
if the FAULT_FLAG_RETRY_NOWAIT option is set. This leads to a deadlock
when tearing down the mm when the process terminates. This bug can only
happen when pfault is enabled, so only KVM clients are affected.

The problem arises in the rare cases in which handle_mm_fault does not
release the mm_sem. This patch fixes the issue by manually releasing
the mm_sem when needed.

Fixes: 24eb3a824c4f3 ("KVM: s390: Add FAULT_FLAG_RETRY_NOWAIT for guest fault")
Cc: <stable@vger.kernel.org> # 3.15+
Signed-off-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index fbe8f2cf924589c3f0e6e31e1619562e55e92586..eecd61bdc0d9664246798a4292a567437787687a 100644 (file)
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -494,6 +494,8 @@ retry:
        /* No reason to continue if interrupted by SIGKILL. */
        if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current)) {
                fault = VM_FAULT_SIGNAL;
+               if (flags & FAULT_FLAG_RETRY_NOWAIT)
+                       goto out_up;
                goto out;
        }
        if (unlikely(fault & VM_FAULT_ERROR))