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ipmi: Move remove_work to dedicated workqueue

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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: 3b9a907223 (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>
This commit is contained in:
Ioanna Alifieraki 2021-11-15 15:16:45 +02:00 committed by Corey Minyard
parent 5833291ab6
commit 1d49eb91e8
1 changed files with 12 additions and 1 deletions
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13
drivers/char/ipmi/ipmi_msghandler.c
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@ -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)
{
@ -1297,7 +1299,7 @@ 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)
@ -5383,6 +5385,13 @@ 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:
@ -5408,6 +5417,8 @@ static void __exit cleanup_ipmi(void)
int count;
if (initialized) {
destroy_workqueue(remove_work_wq);
atomic_notifier_chain_unregister(&panic_notifier_list,
&panic_block);