linux-kernel - [tip:locking/urgent] futex: Fix OWNER

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Date:   Wed, 24 Jan 2018 02:37:55 -0800
From:   tip-bot for Peter Zijlstra <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     peterz@...radead.org, hpa@...or.com, geert@...ux-m68k.org,
        tglx@...utronix.de, akpm@...ux-foundation.org, mingo@...nel.org,
        paulmck@...ibm.com, linux-kernel@...r.kernel.org,
        torvalds@...ux-foundation.org, davej@...emonkey.org.uk
Subject: [tip:locking/urgent] futex: Fix OWNER_DEAD fixup

Commit-ID:  a97cb0e7b3f4c6297fd857055ae8e895f402f501
Gitweb:     https://git.kernel.org/tip/a97cb0e7b3f4c6297fd857055ae8e895f402f501
Author:     Peter Zijlstra <peterz@...radead.org>
AuthorDate: Mon, 22 Jan 2018 11:39:47 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 24 Jan 2018 09:58:18 +0100

futex: Fix OWNER_DEAD fixup

Both Geert and DaveJ reported that the recent futex commit:

  c1e2f0eaf015 ("futex: Avoid violating the 10th rule of futex")

introduced a problem with setting OWNER_DEAD. We set the bit on an
uninitialized variable and then entirely optimize it away as a
dead-store.

Move the setting of the bit to where it is more useful.

Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
Reported-by: Dave Jones <davej@...emonkey.org.uk>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Paul E. McKenney <paulmck@...ibm.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Fixes: c1e2f0eaf015 ("futex: Avoid violating the 10th rule of futex")
Link: http://lkml.kernel.org/r/20180122103947.GD2228@hirez.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/futex.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/futex.c b/kernel/futex.c
index 8c5424d..7f719d1 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -2311,9 +2311,6 @@ static int fixup_pi_state_owner(u32 __user *uaddr, struct futex_q *q,
 	raw_spin_lock_irq(&pi_state->pi_mutex.wait_lock);
 
 	oldowner = pi_state->owner;
-	/* Owner died? */
-	if (!pi_state->owner)
-		newtid |= FUTEX_OWNER_DIED;
 
 	/*
 	 * We are here because either:
@@ -2374,6 +2371,9 @@ retry:
 	}
 
 	newtid = task_pid_vnr(newowner) | FUTEX_WAITERS;
+	/* Owner died? */
+	if (!pi_state->owner)
+		newtid |= FUTEX_OWNER_DIED;
 
 	if (get_futex_value_locked(&uval, uaddr))
 		goto handle_fault;