Merge tag 'io_uring-7.3-20261002' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linuxgrafted

Pull io_uring fixes from Jens Axboe:

 - Fix a task_work add use-after-free with SQPOLL.

   The sqpoll thread could pop and complete the last request while
   io_req_normal_work_add() was still looking at them after the mpscq
   push.

   Use the same approach as DEFER_TASKRUN to protect from that, holding
   an RCU read lock across the add, and have exit wait for an RCU grace
   period for SQPOLL rings as well.

 - CQE32 ring fixes: correct the free entry check for 32b CQEs, zero the
   big_cqe for aux CQEs, and only post the dummy skip CQE on CQE_MIXED
   rings

 - Mark the source filter table as COW when cloning bpf filters, so
   registering another filter on the source doesn't modify the shared
   table in place

 - Initialize the task context before running the BPF loop

 - Requeue zcrx multishot receives stopped by a local resource

 - End a TX_TIMESTAMP multishot cmd when the CQ is full (lollipopkit)

* tag 'io_uring-7.3-20261002' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux:
  io_uring: fix task_work add use-after-free with SQPOLL
  io_uring/cmd_net: end TX_TIMESTAMP multishot when the CQ is full
  io_uring/zcrx: requeue multishot receives stopped by a local resource
  io_uring: initialize task context before running the BPF loop
  io_uring: zero big_cqe for aux CQEs on CQE32 rings
  io_uring: fix free entry check for 32b CQEs on CQE32 rings
  io_uring: only post the dummy skip CQE on CQE_MIXED rings
  io_uring/bpf_filter: mark source as COW when cloning filters

1 files changed, 81 insertions, 0 deletions

diff --git a/scripts/coccinelle/locks/flags.cocci b/scripts/coccinelle/locks/flags.cocci
new file mode 100644
index 000000000..44acf20a9
--- /dev/null
+++ b/scripts/coccinelle/locks/flags.cocci
@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/// Find nested lock+irqsave functions that use the same flags variables
+///
+// Confidence: High
+// Copyright: (C) 2010-2012 Nicolas Palix.
+// Copyright: (C) 2010-2012 Julia Lawall, INRIA/LIP6.
+// Copyright: (C) 2010-2012 Gilles Muller, INRIA/LiP6.
+// URL: https://coccinelle.gitlabpages.inria.fr/website
+// Comments:
+// Options: --no-includes --include-headers
+
+virtual context
+virtual org
+virtual report
+
+@r exists@
+expression lock1,lock2,flags;
+position p1,p2;
+@@
+
+(
+spin_lock_irqsave@p1(lock1,flags)
+|
+read_lock_irqsave@p1(lock1,flags)
+|
+write_lock_irqsave@p1(lock1,flags)
+)
+... when != flags
+(
+spin_lock_irqsave(lock1,flags)
+|
+read_lock_irqsave(lock1,flags)
+|
+write_lock_irqsave(lock1,flags)
+|
+spin_lock_irqsave@p2(lock2,flags)
+|
+read_lock_irqsave@p2(lock2,flags)
+|
+write_lock_irqsave@p2(lock2,flags)
+)
+
+@d exists@
+expression f <= r.flags;
+expression lock1,lock2,flags;
+position r.p1, r.p2;
+@@
+
+(
+*spin_lock_irqsave@p1(lock1,flags)
+|
+*read_lock_irqsave@p1(lock1,flags)
+|
+*write_lock_irqsave@p1(lock1,flags)
+)
+... when != f
+(
+*spin_lock_irqsave@p2(lock2,flags)
+|
+*read_lock_irqsave@p2(lock2,flags)
+|
+*write_lock_irqsave@p2(lock2,flags)
+)
+
+// ----------------------------------------------------------------------
+
+@script:python depends on d && org@
+p1 << r.p1;
+p2 << r.p2;
+@@
+
+cocci.print_main("original lock",p1)
+cocci.print_secs("nested lock+irqsave that reuses flags",p2)
+
+@script:python depends on d && report@
+p1 << r.p1;
+p2 << r.p2;
+@@
+
+msg="ERROR: nested lock+irqsave that reuses flags from line %s." % (p1[0].line)
+coccilib.report.print_report(p2[0], msg)