ipmi: Move remove_work to dedicated workqueue

commit 1d49eb91e86e8c1c1614c72e3e958b6b7e2472a9 upstream.

Currently when removing an ipmi_user the removal is deferred as a work on
the system's workqueue. Although this guarantees the free operation will
occur in non atomic context, it can race with the ipmi_msghandler module
removal (see [1]) . In case a remove_user work is scheduled for removal
and shortly after ipmi_msghandler module is removed we can end up in a
situation where the module is removed fist and when the work is executed
the system crashes with :
BUG: unable to handle page fault for address: ffffffffc05c3450
PF: supervisor instruction fetch in kernel mode
PF: error_code(0x0010) - not-present page
because the pages of the module are gone. In cleanup_ipmi() there is no
easy way to detect if there are any pending works to flush them before
removing the module. This patch creates a separate workqueue and schedules
the remove_work works on it. When removing the module the workqueue is
drained when destroyed to avoid the race.

[1] https://bugs.launchpad.net/bugs/1950666

Cc: stable@vger.kernel.org # 5.1
Fixes: 3b9a907223d7 (ipmi: fix sleep-in-atomic in free_user at cleanup SRCU user->release_barrier)
Signed-off-by: Ioanna Alifieraki <ioanna-maria.alifieraki@canonical.com>
Message-Id: <20211115131645.25116-1-ioanna-maria.alifieraki@canonical.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
index a08f53f..f3a2f22 100644 (file)
--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -191,6 +191,8 @@ struct ipmi_user {
        struct work_struct remove_work;
 };
 
+struct workqueue_struct *remove_work_wq;
+
 static struct ipmi_user *acquire_ipmi_user(struct ipmi_user *user, int *index)
        __acquires(user->release_barrier)
 {
@@ -1261,7 +1263,7 @@ static void free_user(struct kref *ref)
        struct ipmi_user *user = container_of(ref, struct ipmi_user, refcount);
 
        /* SRCU cleanup must happen in task context. */
-       schedule_work(&user->remove_work);
+       queue_work(remove_work_wq, &user->remove_work);
 }
 
 static void _ipmi_destroy_user(struct ipmi_user *user)
@@ -5153,6 +5155,13 @@ static int ipmi_init_msghandler(void)
 
        atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
 
+       remove_work_wq = create_singlethread_workqueue("ipmi-msghandler-remove-wq");
+       if (!remove_work_wq) {
+               pr_err("unable to create ipmi-msghandler-remove-wq workqueue");
+               rv = -ENOMEM;
+               goto out;
+       }
+
        initialized = true;
 
 out:
@@ -5178,6 +5187,8 @@ static void __exit cleanup_ipmi(void)
        int count;
 
        if (initialized) {
+               destroy_workqueue(remove_work_wq);
+
                atomic_notifier_chain_unregister(&panic_notifier_list,
                                                 &panic_block);