6.6-stable patches

added patches:
	io_uring-sqpoll-do-not-put-cpumask-on-stack.patch

diff --git a/queue-6.6/io_uring-sqpoll-do-not-put-cpumask-on-stack.patch b/queue-6.6/io_uring-sqpoll-do-not-put-cpumask-on-stack.patch
new file mode 100644 (file)
index 0000000..644bd07
--- /dev/null
+++ b/queue-6.6/io_uring-sqpoll-do-not-put-cpumask-on-stack.patch
@@ -0,0 +1,50 @@
+From 7f44beadcc11adb98220556d2ddbe9c97aa6d42d Mon Sep 17 00:00:00 2001
+From: Felix Moessbauer <felix.moessbauer@siemens.com>
+Date: Mon, 16 Sep 2024 13:11:50 +0200
+Subject: io_uring/sqpoll: do not put cpumask on stack
+
+From: Felix Moessbauer <felix.moessbauer@siemens.com>
+
+commit 7f44beadcc11adb98220556d2ddbe9c97aa6d42d upstream.
+
+Putting the cpumask on the stack is deprecated for a long time (since
+2d3854a37e8), as these can be big. Given that, change the on-stack
+allocation of allowed_mask to be dynamically allocated.
+
+Fixes: f011c9cf04c0 ("io_uring/sqpoll: do not allow pinning outside of cpuset")
+Signed-off-by: Felix Moessbauer <felix.moessbauer@siemens.com>
+Link: https://lore.kernel.org/r/20240916111150.1266191-1-felix.moessbauer@siemens.com
+Signed-off-by: Jens Axboe <axboe@kernel.dk>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ io_uring/sqpoll.c |   13 ++++++++++---
+ 1 file changed, 10 insertions(+), 3 deletions(-)
+
+--- a/io_uring/sqpoll.c
++++ b/io_uring/sqpoll.c
+@@ -402,15 +402,22 @@ __cold int io_sq_offload_create(struct i
+                       return 0;
+ 
+               if (p->flags & IORING_SETUP_SQ_AFF) {
+-                      struct cpumask allowed_mask;
++                      cpumask_var_t allowed_mask;
+                       int cpu = p->sq_thread_cpu;
+ 
+                       ret = -EINVAL;
+                       if (cpu >= nr_cpu_ids || !cpu_online(cpu))
+                               goto err_sqpoll;
+-                      cpuset_cpus_allowed(current, &allowed_mask);
+-                      if (!cpumask_test_cpu(cpu, &allowed_mask))
++                      ret = -ENOMEM;
++                      if (!alloc_cpumask_var(&allowed_mask, GFP_KERNEL))
+                               goto err_sqpoll;
++                      ret = -EINVAL;
++                      cpuset_cpus_allowed(current, allowed_mask);
++                      if (!cpumask_test_cpu(cpu, allowed_mask)) {
++                              free_cpumask_var(allowed_mask);
++                              goto err_sqpoll;
++                      }
++                      free_cpumask_var(allowed_mask);
+                       sqd->sq_cpu = cpu;
+               } else {
+                       sqd->sq_cpu = -1;

diff --git a/queue-6.6/series b/queue-6.6/series
index 63cc1b5e6c04b3b2281dc6c77d866eb1665fb1e3..14aa813118b7a8bee8ef0fa1dc9fd3f751fc2d2e 100644 (file)
--- a/queue-6.6/series
+++ b/queue-6.6/series
@@ -395,3 +395,4 @@ revert-net-libwx-fix-alloc-msix-vectors-failed.patch
 xen-move-checks-for-e820-conflicts-further-up.patch
 xen-allow-mapping-acpi-data-using-a-different-physical-address.patch
 io_uring-sqpoll-retain-test-for-whether-the-cpu-is-valid.patch
+io_uring-sqpoll-do-not-put-cpumask-on-stack.patch