lkml.org 
[lkml]   [2021]   [May]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[tip: locking/urgent] Revert 337f13046ff0 ("futex: Allow FUTEX_CLOCK_REALTIME with FUTEX_WAIT op")
The following commit has been merged into the locking/urgent branch of tip:

Commit-ID: 4fbf5d6837bf81fd7a27d771358f4ee6c4f243f8
Gitweb: https://git.kernel.org/tip/4fbf5d6837bf81fd7a27d771358f4ee6c4f243f8
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Thu, 22 Apr 2021 21:44:18 +02:00
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Thu, 06 May 2021 20:12:40 +02:00

Revert 337f13046ff0 ("futex: Allow FUTEX_CLOCK_REALTIME with FUTEX_WAIT op")

The FUTEX_WAIT operand has historically a relative timeout which means that
the clock id is irrelevant as relative timeouts on CLOCK_REALTIME are not
subject to wall clock changes and therefore are mapped by the kernel to
CLOCK_MONOTONIC for simplicity.

If a caller would set FUTEX_CLOCK_REALTIME for FUTEX_WAIT the timeout is
still treated relative vs. CLOCK_MONOTONIC and then the wait arms that
timeout based on CLOCK_REALTIME which is broken and obviously has never
been used or even tested.

Reject any attempt to use FUTEX_CLOCK_REALTIME with FUTEX_WAIT again.

The desired functionality can be achieved with FUTEX_WAIT_BITSET and a
FUTEX_BITSET_MATCH_ANY argument.

Fixes: 337f13046ff0 ("futex: Allow FUTEX_CLOCK_REALTIME with FUTEX_WAIT op")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210422194704.834797921@linutronix.de

---
kernel/futex.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/futex.c b/kernel/futex.c
index c98b825..4740200 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -3710,8 +3710,7 @@ long do_futex(u32 __user *uaddr, int op, u32 val, ktime_t *timeout,

if (op & FUTEX_CLOCK_REALTIME) {
flags |= FLAGS_CLOCKRT;
- if (cmd != FUTEX_WAIT && cmd != FUTEX_WAIT_BITSET && \
- cmd != FUTEX_WAIT_REQUEUE_PI)
+ if (cmd != FUTEX_WAIT_BITSET && cmd != FUTEX_WAIT_REQUEUE_PI)
return -ENOSYS;
}

\
 
 \ /
  Last update: 2021-05-06 20:15    [W:0.146 / U:0.040 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site