diff options
| author | Hyunwoo Kim <v4bel@theori.io> | 2023-12-09 13:05:38 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-12-20 19:01:48 +0300 |
| commit | 63caa51833e8701248a8a89d83effe96f30e4c80 (patch) | |
| tree | 48a7f9cbf86e36968d806b47081ad4889a6c2835 /net | |
| parent | 531fd46f92895bcdc41bedd12533266c397196da (diff) | |
| download | linux-63caa51833e8701248a8a89d83effe96f30e4c80.tar.xz | |
net/rose: Fix Use-After-Free in rose_ioctl
[ Upstream commit 810c38a369a0a0ce625b5c12169abce1dd9ccd53 ]
Because rose_ioctl() accesses sk->sk_receive_queue
without holding a sk->sk_receive_queue.lock, it can
cause a race with rose_accept().
A use-after-free for skb occurs with the following flow.
```
rose_ioctl() -> skb_peek()
rose_accept() -> skb_dequeue() -> kfree_skb()
```
Add sk->sk_receive_queue.lock to rose_ioctl() to fix this issue.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Hyunwoo Kim <v4bel@theori.io>
Link: https://lore.kernel.org/r/20231209100538.GA407321@v4bel-B760M-AORUS-ELITE-AX
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/rose/af_rose.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/net/rose/af_rose.c b/net/rose/af_rose.c index 49dafe9ac72f..4a5c2dc8dd7a 100644 --- a/net/rose/af_rose.c +++ b/net/rose/af_rose.c @@ -1315,9 +1315,11 @@ static int rose_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) case TIOCINQ: { struct sk_buff *skb; long amount = 0L; - /* These two are safe on a single CPU system as only user tasks fiddle here */ + + spin_lock_irq(&sk->sk_receive_queue.lock); if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) amount = skb->len; + spin_unlock_irq(&sk->sk_receive_queue.lock); return put_user(amount, (unsigned int __user *) argp); } |