[PATCH 5.8 12/70] io-wq: fix use-after-free in io_wq_worker_running

Greg Kroah-Hartman
2020-10-31T11:40:28Z

From: Hillf Danton <hdanton@sina.com>

commit c4068bf898ddaef791049a366828d9b84b467bda upstream.

The smart syzbot has found a reproducer for the following issue:

==================================================================
BUG: KASAN: use-after-free in instrument_atomic_write include/linux/instrumented.h:71 [inline]
BUG: KASAN: use-after-free in atomic_inc include/asm-generic/atomic-instrumented.h:240 [inline]
BUG: KASAN: use-after-free in io_wqe_inc_running fs/io-wq.c:301 [inline]
BUG: KASAN: use-after-free in io_wq_worker_running+0xde/0x110 fs/io-wq.c:613
Write of size 4 at addr ffff8882183db08c by task io_wqe_worker-0/7771

CPU: 0 PID: 7771 Comm: io_wqe_worker-0 Not tainted 5.9.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x198/0x1fd lib/dump_stack.c:118
print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383
__kasan_report mm/kasan/report.c:513 [inline]
kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
check_memory_region_inline mm/kasan/generic.c:186 [inline]
check_memory_region+0x13d/0x180 mm/kasan/generic.c:192
instrument_atomic_write include/linux/instrumented.h:71 [inline]
atomic_inc include/asm-generic/atomic-instrumented.h:240 [inline]
io_wqe_inc_running fs/io-wq.c:301 [inline]
io_wq_worker_running+0xde/0x110 fs/io-wq.c:613
schedule_timeout+0x148/0x250 kernel/time/timer.c:1879
io_wqe_worker+0x517/0x10e0 fs/io-wq.c:580
kthread+0x3b5/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Allocated by task 7768:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
kasan_set_track mm/kasan/common.c:56 [inline]
__kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461
kmem_cache_alloc_node_trace+0x17b/0x3f0 mm/slab.c:3594
kmalloc_node include/linux/slab.h:572 [inline]
kzalloc_node include/linux/slab.h:677 [inline]
io_wq_create+0x57b/0xa10 fs/io-wq.c:1064
io_init_wq_offload fs/io_uring.c:7432 [inline]
io_sq_offload_start fs/io_uring.c:7504 [inline]
io_uring_create fs/io_uring.c:8625 [inline]
io_uring_setup+0x1836/0x28e0 fs/io_uring.c:8694
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 21:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
kasan_set_track+0x1c/0x30 mm/kasan/common.c:56
kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355
__kasan_slab_free+0xd8/0x120 mm/kasan/common.c:422
__cache_free mm/slab.c:3418 [inline]
kfree+0x10e/0x2b0 mm/slab.c:3756
__io_wq_destroy fs/io-wq.c:1138 [inline]
io_wq_destroy+0x2af/0x460 fs/io-wq.c:1146
io_finish_async fs/io_uring.c:6836 [inline]
io_ring_ctx_free fs/io_uring.c:7870 [inline]
io_ring_exit_work+0x1e4/0x6d0 fs/io_uring.c:7954
process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
kthread+0x3b5/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

The buggy address belongs to the object at ffff8882183db000
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 140 bytes inside of
1024-byte region [ffff8882183db000, ffff8882183db400)
The buggy address belongs to the page:
page:000000009bada22b refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2183db
flags: 0x57ffe0000000200(slab)
raw: 057ffe0000000200 ffffea0008604c48 ffffea00086a8648 ffff8880aa040700
raw: 0000000000000000 ffff8882183db000 0000000100000002 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
ffff8882183daf80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff8882183db000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8882183db080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8882183db100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8882183db180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

which is down to the comment below,

/* all workers gone, wq exit can proceed */
if (!nr_workers && refcount_dec_and_test(&wqe->wq->refs))
complete(&wqe->wq->done);

because there might be multiple cases of wqe in a wq and we would wait
for every worker in every wqe to go home before releasing wq's resources
on destroying.

To that end, rework wq's refcount by making it independent of the tracking
of workers because after all they are two different things, and keeping
it balanced when workers come and go. Note the manager kthread, like
other workers, now holds a grab to wq during its lifetime.

Finally to help destroy wq, check IO_WQ_BIT_EXIT upon creating worker
and do nothing for exiting wq.

Cc: stable@vger.kernel.org # v5.5+
Reported-by: syzbot+45fa0a195b941764e0f0@syzkaller.appspotmail.com
Reported-by: syzbot+9af99580130003da82b1@syzkaller.appspotmail.com
Cc: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Hillf Danton <hdanton@sina.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/io-wq.c | 116 ++++++++++++++++++++++++++++++-------------------------------
1 file changed, 58 insertions(+), 58 deletions(-)

--- a/fs/io-wq.c
+++ b/fs/io-wq.c
@@ -202,7 +202,6 @@ static void io_worker_exit(struct io_wor
{
struct io_wqe *wqe = worker->wqe;
struct io_wqe_acct *acct = io_wqe_get_acct(wqe, worker);
- unsigned nr_workers;

/*
* If we're not at zero, someone else is holding a brief reference
@@ -230,15 +229,11 @@ static void io_worker_exit(struct io_wor
raw_spin_lock_irq(&wqe->lock);
}
acct->nr_workers--;
- nr_workers = wqe->acct[IO_WQ_ACCT_BOUND].nr_workers +
- wqe->acct[IO_WQ_ACCT_UNBOUND].nr_workers;
raw_spin_unlock_irq(&wqe->lock);

- /* all workers gone, wq exit can proceed */
- if (!nr_workers && refcount_dec_and_test(&wqe->wq->refs))
- complete(&wqe->wq->done);
-
kfree_rcu(worker, rcu);
+ if (refcount_dec_and_test(&wqe->wq->refs))
+ complete(&wqe->wq->done);
}

static inline bool io_wqe_run_queue(struct io_wqe *wqe)
@@ -644,7 +639,7 @@ void io_wq_worker_sleeping(struct task_s

static bool create_io_worker(struct io_wq *wq, struct io_wqe *wqe, int index)
{
- struct io_wqe_acct *acct =&wqe->acct[index];
+ struct io_wqe_acct *acct = &wqe->acct[index];
struct io_worker *worker;

worker = kzalloc_node(sizeof(*worker), GFP_KERNEL, wqe->node);
@@ -677,6 +672,7 @@ static bool create_io_worker(struct io_w
if (index == IO_WQ_ACCT_UNBOUND)
atomic_inc(&wq->user->processes);

+ refcount_inc(&wq->refs);
wake_up_process(worker->task);
return true;
}
@@ -692,28 +688,63 @@ static inline bool io_wqe_need_worker(st
return acct->nr_workers < acct->max_workers;
}

+static bool io_wqe_worker_send_sig(struct io_worker *worker, void *data)
+{
+ send_sig(SIGINT, worker->task, 1);
+ return false;
+}
+
+/*
+ * Iterate the passed in list and call the specific function for each
+ * worker that isn't exiting
+ */
+static bool io_wq_for_each_worker(struct io_wqe *wqe,
+ bool (*func)(struct io_worker *, void *),
+ void *data)
+{
+ struct io_worker *worker;
+ bool ret = false;
+
+ list_for_each_entry_rcu(worker, &wqe->all_list, all_list) {
+ if (io_worker_get(worker)) {
+ /* no task if node is/was offline */
+ if (worker->task)
+ ret = func(worker, data);
+ io_worker_release(worker);
+ if (ret)
+ break;
+ }
+ }
+
+ return ret;
+}
+
+static bool io_wq_worker_wake(struct io_worker *worker, void *data)
+{
+ wake_up_process(worker->task);
+ return false;
+}
+
/*
* Manager thread. Tasked with creating new workers, if we need them.
*/
static int io_wq_manager(void *data)
{
struct io_wq *wq = data;
- int workers_to_create = num_possible_nodes();
int node;

/* create fixed workers */
- refcount_set(&wq->refs, workers_to_create);
+ refcount_set(&wq->refs, 1);
for_each_node(node) {
if (!node_online(node))
continue;
- if (!create_io_worker(wq, wq->wqes[node], IO_WQ_ACCT_BOUND))
- goto err;
- workers_to_create--;
+ if (create_io_worker(wq, wq->wqes[node], IO_WQ_ACCT_BOUND))
+ continue;
+ set_bit(IO_WQ_BIT_ERROR, &wq->state);
+ set_bit(IO_WQ_BIT_EXIT, &wq->state);
+ goto out;
}

- while (workers_to_create--)
- refcount_dec(&wq->refs);
-
complete(&wq->done);

while (!kthread_should_stop()) {
@@ -745,12 +776,18 @@ static int io_wq_manager(void *data)
if (current->task_works)
task_work_run();

- return 0;
-err:
- set_bit(IO_WQ_BIT_ERROR, &wq->state);
- set_bit(IO_WQ_BIT_EXIT, &wq->state);
- if (refcount_sub_and_test(workers_to_create, &wq->refs))
+out:
+ if (refcount_dec_and_test(&wq->refs)) {
complete(&wq->done);
+ return 0;
+ }
+ /* if ERROR is set and we get here, we have workers to wake */
+ if (test_bit(IO_WQ_BIT_ERROR, &wq->state)) {
+ rcu_read_lock();
+ for_each_node(node)
+ io_wq_for_each_worker(wq->wqes[node], io_wq_worker_wake, NULL);
+ rcu_read_unlock();
+ }
return 0;
}

@@ -858,37 +895,6 @@ void io_wq_hash_work(struct io_wq_work *
work->flags |= (IO_WQ_WORK_HASHED | (bit << IO_WQ_HASH_SHIFT));
}

-static bool io_wqe_worker_send_sig(struct io_worker *worker, void *data)
-{
- send_sig(SIGINT, worker->task, 1);
- return false;
-}
-
-/*
- * Iterate the passed in list and call the specific function for each
- * worker that isn't exiting
- */
-static bool io_wq_for_each_worker(struct io_wqe *wqe,
- bool (*func)(struct io_worker *, void *),
- void *data)
-{
- struct io_worker *worker;
- bool ret = false;
-
- list_for_each_entry_rcu(worker, &wqe->all_list, all_list) {
- if (io_worker_get(worker)) {
- /* no task if node is/was offline */
- if (worker->task)
- ret = func(worker, data);
- io_worker_release(worker);
- if (ret)
- break;
- }
- }
-
- return ret;
-}
-
void io_wq_cancel_all(struct io_wq *wq)
{
int node;
@@ -1121,12 +1127,6 @@ bool io_wq_get(struct io_wq *wq, struct
return refcount_inc_not_zero(&wq->use_refs);
}

-static bool io_wq_worker_wake(struct io_worker *worker, void *data)
-{
- wake_up_process(worker->task);
- return false;
-}
-
static void __io_wq_destroy(struct io_wq *wq)
{
int node;