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Subject[PATCH 4.19 209/211] fuse: fix deadlock with aio poll and fuse_iqueue::waitq.lock
Date
From: Eric Biggers <ebiggers@google.com>

[ Upstream commit 76e43c8ccaa35c30d5df853013561145a0f750a5 ]

When IOCB_CMD_POLL is used on the FUSE device, aio_poll() disables IRQs
and takes kioctx::ctx_lock, then fuse_iqueue::waitq.lock.

This may have to wait for fuse_iqueue::waitq.lock to be released by one
of many places that take it with IRQs enabled. Since the IRQ handler
may take kioctx::ctx_lock, lockdep reports that a deadlock is possible.

Fix it by protecting the state of struct fuse_iqueue with a separate
spinlock, and only accessing fuse_iqueue::waitq using the versions of
the waitqueue functions which do IRQ-safe locking internally.

Reproducer:

#include <fcntl.h>
#include <stdio.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <unistd.h>
#include <linux/aio_abi.h>

int main()
{
char opts[128];
int fd = open("/dev/fuse", O_RDWR);
aio_context_t ctx = 0;
struct iocb cb = { .aio_lio_opcode = IOCB_CMD_POLL, .aio_fildes = fd };
struct iocb *cbp = &cb;

sprintf(opts, "fd=%d,rootmode=040000,user_id=0,group_id=0", fd);
mkdir("mnt", 0700);
mount("foo", "mnt", "fuse", 0, opts);
syscall(__NR_io_setup, 1, &ctx);
syscall(__NR_io_submit, ctx, 1, &cbp);
}

Beginning of lockdep output:

=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
5.3.0-rc5 #9 Not tainted
-----------------------------------------------------
syz_fuse/135 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
000000003590ceda (&fiq->waitq){+.+.}, at: spin_lock include/linux/spinlock.h:338 [inline]
000000003590ceda (&fiq->waitq){+.+.}, at: aio_poll fs/aio.c:1751 [inline]
000000003590ceda (&fiq->waitq){+.+.}, at: __io_submit_one.constprop.0+0x203/0x5b0 fs/aio.c:1825

and this task is already holding:
0000000075037284 (&(&ctx->ctx_lock)->rlock){..-.}, at: spin_lock_irq include/linux/spinlock.h:363 [inline]
0000000075037284 (&(&ctx->ctx_lock)->rlock){..-.}, at: aio_poll fs/aio.c:1749 [inline]
0000000075037284 (&(&ctx->ctx_lock)->rlock){..-.}, at: __io_submit_one.constprop.0+0x1f4/0x5b0 fs/aio.c:1825
which would create a new lock dependency:
(&(&ctx->ctx_lock)->rlock){..-.} -> (&fiq->waitq){+.+.}

but this new dependency connects a SOFTIRQ-irq-safe lock:
(&(&ctx->ctx_lock)->rlock){..-.}

[...]

Reported-by: syzbot+af05535bb79520f95431@syzkaller.appspotmail.com
Reported-by: syzbot+d86c4426a01f60feddc7@syzkaller.appspotmail.com
Fixes: bfe4037e722e ("aio: implement IOCB_CMD_POLL")
Cc: <stable@vger.kernel.org> # v4.19+
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/fuse/dev.c | 89 +++++++++++++++++++++++++-----------------------
fs/fuse/fuse_i.h | 3 ++
fs/fuse/inode.c | 1 +
3 files changed, 50 insertions(+), 43 deletions(-)

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 6ee471b72a34d..c0d59a86ada2e 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -331,7 +331,7 @@ static void queue_request(struct fuse_iqueue *fiq, struct fuse_req *req)
req->in.h.len = sizeof(struct fuse_in_header) +
len_args(req->in.numargs, (struct fuse_arg *) req->in.args);
list_add_tail(&req->list, &fiq->pending);
- wake_up_locked(&fiq->waitq);
+ wake_up(&fiq->waitq);
kill_fasync(&fiq->fasync, SIGIO, POLL_IN);
}

@@ -343,16 +343,16 @@ void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget,
forget->forget_one.nodeid = nodeid;
forget->forget_one.nlookup = nlookup;

- spin_lock(&fiq->waitq.lock);
+ spin_lock(&fiq->lock);
if (fiq->connected) {
fiq->forget_list_tail->next = forget;
fiq->forget_list_tail = forget;
- wake_up_locked(&fiq->waitq);
+ wake_up(&fiq->waitq);
kill_fasync(&fiq->fasync, SIGIO, POLL_IN);
} else {
kfree(forget);
}
- spin_unlock(&fiq->waitq.lock);
+ spin_unlock(&fiq->lock);
}

static void flush_bg_queue(struct fuse_conn *fc)
@@ -365,10 +365,10 @@ static void flush_bg_queue(struct fuse_conn *fc)
req = list_entry(fc->bg_queue.next, struct fuse_req, list);
list_del(&req->list);
fc->active_background++;
- spin_lock(&fiq->waitq.lock);
+ spin_lock(&fiq->lock);
req->in.h.unique = fuse_get_unique(fiq);
queue_request(fiq, req);
- spin_unlock(&fiq->waitq.lock);
+ spin_unlock(&fiq->lock);
}
}

@@ -387,9 +387,9 @@ static void request_end(struct fuse_conn *fc, struct fuse_req *req)
if (test_and_set_bit(FR_FINISHED, &req->flags))
goto put_request;

- spin_lock(&fiq->waitq.lock);
+ spin_lock(&fiq->lock);
list_del_init(&req->intr_entry);
- spin_unlock(&fiq->waitq.lock);
+ spin_unlock(&fiq->lock);
WARN_ON(test_bit(FR_PENDING, &req->flags));
WARN_ON(test_bit(FR_SENT, &req->flags));
if (test_bit(FR_BACKGROUND, &req->flags)) {
@@ -427,16 +427,16 @@ static void request_end(struct fuse_conn *fc, struct fuse_req *req)

static void queue_interrupt(struct fuse_iqueue *fiq, struct fuse_req *req)
{
- spin_lock(&fiq->waitq.lock);
+ spin_lock(&fiq->lock);
if (test_bit(FR_FINISHED, &req->flags)) {
- spin_unlock(&fiq->waitq.lock);
+ spin_unlock(&fiq->lock);
return;
}
if (list_empty(&req->intr_entry)) {
list_add_tail(&req->intr_entry, &fiq->interrupts);
wake_up_locked(&fiq->waitq);
}
- spin_unlock(&fiq->waitq.lock);
+ spin_unlock(&fiq->lock);
kill_fasync(&fiq->fasync, SIGIO, POLL_IN);
}

@@ -466,16 +466,16 @@ static void request_wait_answer(struct fuse_conn *fc, struct fuse_req *req)
if (!err)
return;

- spin_lock(&fiq->waitq.lock);
+ spin_lock(&fiq->lock);
/* Request is not yet in userspace, bail out */
if (test_bit(FR_PENDING, &req->flags)) {
list_del(&req->list);
- spin_unlock(&fiq->waitq.lock);
+ spin_unlock(&fiq->lock);
__fuse_put_request(req);
req->out.h.error = -EINTR;
return;
}
- spin_unlock(&fiq->waitq.lock);
+ spin_unlock(&fiq->lock);
}

/*
@@ -490,9 +490,9 @@ static void __fuse_request_send(struct fuse_conn *fc, struct fuse_req *req)
struct fuse_iqueue *fiq = &fc->iq;

BUG_ON(test_bit(FR_BACKGROUND, &req->flags));
- spin_lock(&fiq->waitq.lock);
+ spin_lock(&fiq->lock);
if (!fiq->connected) {
- spin_unlock(&fiq->waitq.lock);
+ spin_unlock(&fiq->lock);
req->out.h.error = -ENOTCONN;
} else {
req->in.h.unique = fuse_get_unique(fiq);
@@ -500,7 +500,7 @@ static void __fuse_request_send(struct fuse_conn *fc, struct fuse_req *req)
/* acquire extra reference, since request is still needed
after request_end() */
__fuse_get_request(req);
- spin_unlock(&fiq->waitq.lock);
+ spin_unlock(&fiq->lock);

request_wait_answer(fc, req);
/* Pairs with smp_wmb() in request_end() */
@@ -633,12 +633,12 @@ static int fuse_request_send_notify_reply(struct fuse_conn *fc,

__clear_bit(FR_ISREPLY, &req->flags);
req->in.h.unique = unique;
- spin_lock(&fiq->waitq.lock);
+ spin_lock(&fiq->lock);
if (fiq->connected) {
queue_request(fiq, req);
err = 0;
}
- spin_unlock(&fiq->waitq.lock);
+ spin_unlock(&fiq->lock);

return err;
}
@@ -1082,12 +1082,12 @@ static int request_pending(struct fuse_iqueue *fiq)
* Unlike other requests this is assembled on demand, without a need
* to allocate a separate fuse_req structure.
*
- * Called with fiq->waitq.lock held, releases it
+ * Called with fiq->lock held, releases it
*/
static int fuse_read_interrupt(struct fuse_iqueue *fiq,
struct fuse_copy_state *cs,
size_t nbytes, struct fuse_req *req)
-__releases(fiq->waitq.lock)
+__releases(fiq->lock)
{
struct fuse_in_header ih;
struct fuse_interrupt_in arg;
@@ -1103,7 +1103,7 @@ __releases(fiq->waitq.lock)
ih.unique = req->intr_unique;
arg.unique = req->in.h.unique;

- spin_unlock(&fiq->waitq.lock);
+ spin_unlock(&fiq->lock);
if (nbytes < reqsize)
return -EINVAL;

@@ -1140,7 +1140,7 @@ static struct fuse_forget_link *dequeue_forget(struct fuse_iqueue *fiq,
static int fuse_read_single_forget(struct fuse_iqueue *fiq,
struct fuse_copy_state *cs,
size_t nbytes)
-__releases(fiq->waitq.lock)
+__releases(fiq->lock)
{
int err;
struct fuse_forget_link *forget = dequeue_forget(fiq, 1, NULL);
@@ -1154,7 +1154,7 @@ __releases(fiq->waitq.lock)
.len = sizeof(ih) + sizeof(arg),
};

- spin_unlock(&fiq->waitq.lock);
+ spin_unlock(&fiq->lock);
kfree(forget);
if (nbytes < ih.len)
return -EINVAL;
@@ -1172,7 +1172,7 @@ __releases(fiq->waitq.lock)

static int fuse_read_batch_forget(struct fuse_iqueue *fiq,
struct fuse_copy_state *cs, size_t nbytes)
-__releases(fiq->waitq.lock)
+__releases(fiq->lock)
{
int err;
unsigned max_forgets;
@@ -1186,13 +1186,13 @@ __releases(fiq->waitq.lock)
};

if (nbytes < ih.len) {
- spin_unlock(&fiq->waitq.lock);
+ spin_unlock(&fiq->lock);
return -EINVAL;
}

max_forgets = (nbytes - ih.len) / sizeof(struct fuse_forget_one);
head = dequeue_forget(fiq, max_forgets, &count);
- spin_unlock(&fiq->waitq.lock);
+ spin_unlock(&fiq->lock);

arg.count = count;
ih.len += count * sizeof(struct fuse_forget_one);
@@ -1222,7 +1222,7 @@ __releases(fiq->waitq.lock)
static int fuse_read_forget(struct fuse_conn *fc, struct fuse_iqueue *fiq,
struct fuse_copy_state *cs,
size_t nbytes)
-__releases(fiq->waitq.lock)
+__releases(fiq->lock)
{
if (fc->minor < 16 || fiq->forget_list_head.next->next == NULL)
return fuse_read_single_forget(fiq, cs, nbytes);
@@ -1251,16 +1251,19 @@ static ssize_t fuse_dev_do_read(struct fuse_dev *fud, struct file *file,
unsigned reqsize;

restart:
- spin_lock(&fiq->waitq.lock);
- err = -EAGAIN;
- if ((file->f_flags & O_NONBLOCK) && fiq->connected &&
- !request_pending(fiq))
- goto err_unlock;
+ for (;;) {
+ spin_lock(&fiq->lock);
+ if (!fiq->connected || request_pending(fiq))
+ break;
+ spin_unlock(&fiq->lock);

- err = wait_event_interruptible_exclusive_locked(fiq->waitq,
+ if (file->f_flags & O_NONBLOCK)
+ return -EAGAIN;
+ err = wait_event_interruptible_exclusive(fiq->waitq,
!fiq->connected || request_pending(fiq));
- if (err)
- goto err_unlock;
+ if (err)
+ return err;
+ }

if (!fiq->connected) {
err = (fc->aborted && fc->abort_err) ? -ECONNABORTED : -ENODEV;
@@ -1284,7 +1287,7 @@ static ssize_t fuse_dev_do_read(struct fuse_dev *fud, struct file *file,
req = list_entry(fiq->pending.next, struct fuse_req, list);
clear_bit(FR_PENDING, &req->flags);
list_del_init(&req->list);
- spin_unlock(&fiq->waitq.lock);
+ spin_unlock(&fiq->lock);

in = &req->in;
reqsize = in->h.len;
@@ -1341,7 +1344,7 @@ static ssize_t fuse_dev_do_read(struct fuse_dev *fud, struct file *file,
return err;

err_unlock:
- spin_unlock(&fiq->waitq.lock);
+ spin_unlock(&fiq->lock);
return err;
}

@@ -2054,12 +2057,12 @@ static __poll_t fuse_dev_poll(struct file *file, poll_table *wait)
fiq = &fud->fc->iq;
poll_wait(file, &fiq->waitq, wait);

- spin_lock(&fiq->waitq.lock);
+ spin_lock(&fiq->lock);
if (!fiq->connected)
mask = EPOLLERR;
else if (request_pending(fiq))
mask |= EPOLLIN | EPOLLRDNORM;
- spin_unlock(&fiq->waitq.lock);
+ spin_unlock(&fiq->lock);

return mask;
}
@@ -2150,15 +2153,15 @@ void fuse_abort_conn(struct fuse_conn *fc, bool is_abort)
fc->max_background = UINT_MAX;
flush_bg_queue(fc);

- spin_lock(&fiq->waitq.lock);
+ spin_lock(&fiq->lock);
fiq->connected = 0;
list_for_each_entry(req, &fiq->pending, list)
clear_bit(FR_PENDING, &req->flags);
list_splice_tail_init(&fiq->pending, &to_end);
while (forget_pending(fiq))
kfree(dequeue_forget(fiq, 1, NULL));
- wake_up_all_locked(&fiq->waitq);
- spin_unlock(&fiq->waitq.lock);
+ wake_up_all(&fiq->waitq);
+ spin_unlock(&fiq->lock);
kill_fasync(&fiq->fasync, SIGIO, POLL_IN);
end_polls(fc);
wake_up_all(&fc->blocked_waitq);
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index cec8b8e749695..900bdcf79bfc0 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -388,6 +388,9 @@ struct fuse_iqueue {
/** Connection established */
unsigned connected;

+ /** Lock protecting accesses to members of this structure */
+ spinlock_t lock;
+
/** Readers of the connection are waiting on this */
wait_queue_head_t waitq;

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index db9e60b7eb691..cb018315ecaf5 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -585,6 +585,7 @@ static int fuse_show_options(struct seq_file *m, struct dentry *root)
static void fuse_iqueue_init(struct fuse_iqueue *fiq)
{
memset(fiq, 0, sizeof(struct fuse_iqueue));
+ spin_lock_init(&fiq->lock);
init_waitqueue_head(&fiq->waitq);
INIT_LIST_HEAD(&fiq->pending);
INIT_LIST_HEAD(&fiq->interrupts);
--
2.20.1


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