Patch "locking/rwsem-spinlock: Fix EINTR branch in __down_write_common()" has been added to the 4.12-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    locking/rwsem-spinlock: Fix EINTR branch in __down_write_common()

to the 4.12-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     locking-rwsem-spinlock-fix-eintr-branch-in-__down_write_common.patch
and it can be found in the queue-4.12 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From a0c4acd2c220376b4e9690e75782d0c0afdaab9f Mon Sep 17 00:00:00 2001
From: Kirill Tkhai <ktkhai@virtuozzo.com>
Date: Fri, 16 Jun 2017 16:44:34 +0300
Subject: locking/rwsem-spinlock: Fix EINTR branch in __down_write_common()

From: Kirill Tkhai <ktkhai@virtuozzo.com>

commit a0c4acd2c220376b4e9690e75782d0c0afdaab9f upstream.

If a writer could been woken up, the above branch

	if (sem->count == 0)
		break;

would have moved us to taking the sem. So, it's
not the time to wake a writer now, and only readers
are allowed now. Thus, 0 must be passed to __rwsem_do_wake().

Next, __rwsem_do_wake() wakes readers unconditionally.
But we mustn't do that if the sem is owned by writer
in the moment. Otherwise, writer and reader own the sem
the same time, which leads to memory corruption in
callers.

rwsem-xadd.c does not need that, as:

  1) the similar check is made lockless there,
  2) in __rwsem_mark_wake::try_reader_grant we test,

that sem is not owned by writer.

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Niklas Cassel <niklas.cassel@axis.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: 17fcbd590d0c "locking/rwsem: Fix down_write_killable() for CONFIG_RWSEM_GENERIC_SPINLOCK=y"
Link: http://lkml.kernel.org/r/149762063282.19811.9129615532201147826.stgit@localhost.localdomain
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 kernel/locking/rwsem-spinlock.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/kernel/locking/rwsem-spinlock.c
+++ b/kernel/locking/rwsem-spinlock.c
@@ -231,8 +231,8 @@ int __sched __down_write_common(struct r
 
 out_nolock:
 	list_del(&waiter.list);
-	if (!list_empty(&sem->wait_list))
-		__rwsem_do_wake(sem, 1);
+	if (!list_empty(&sem->wait_list) && sem->count >= 0)
+		__rwsem_do_wake(sem, 0);
 	raw_spin_unlock_irqrestore(&sem->wait_lock, flags);
 
 	return -EINTR;


Patches currently in stable-queue which might be from ktkhai@virtuozzo.com are

queue-4.12/locking-rwsem-spinlock-fix-eintr-branch-in-__down_write_common.patch