tun, bpf: fix suspicious RCU usage in tun_{attach, detach}_filter

Sasha Levin reported a suspicious rcu_dereference_protected() warning
found while fuzzing with trinity that is similar to this one:

  [   52.765684] net/core/filter.c:2262 suspicious rcu_dereference_protected() usage!
  [   52.765688] other info that might help us debug this:
  [   52.765695] rcu_scheduler_active = 1, debug_locks = 1
  [   52.765701] 1 lock held by a.out/1525:
  [   52.765704]  #0:  (rtnl_mutex){+.+.+.}, at: [<ffffffff816a64b7>] rtnl_lock+0x17/0x20
  [   52.765721] stack backtrace:
  [   52.765728] CPU: 1 PID: 1525 Comm: a.out Not tainted 4.5.0+ #264
  [...]
  [   52.765768] Call Trace:
  [   52.765775]  [<ffffffff813e488d>] dump_stack+0x85/0xc8
  [   52.765784]  [<ffffffff810f2fa5>] lockdep_rcu_suspicious+0xd5/0x110
  [   52.765792]  [<ffffffff816afdc2>] sk_detach_filter+0x82/0x90
  [   52.765801]  [<ffffffffa0883425>] tun_detach_filter+0x35/0x90 [tun]
  [   52.765810]  [<ffffffffa0884ed4>] __tun_chr_ioctl+0x354/0x1130 [tun]
  [   52.765818]  [<ffffffff8136fed0>] ? selinux_file_ioctl+0x130/0x210
  [   52.765827]  [<ffffffffa0885ce3>] tun_chr_ioctl+0x13/0x20 [tun]
  [   52.765834]  [<ffffffff81260ea6>] do_vfs_ioctl+0x96/0x690
  [   52.765843]  [<ffffffff81364af3>] ? security_file_ioctl+0x43/0x60
  [   52.765850]  [<ffffffff81261519>] SyS_ioctl+0x79/0x90
  [   52.765858]  [<ffffffff81003ba2>] do_syscall_64+0x62/0x140
  [   52.765866]  [<ffffffff817d563f>] entry_SYSCALL64_slow_path+0x25/0x25

Same can be triggered with PROVE_RCU (+ PROVE_RCU_REPEATEDLY) enabled
from tun_attach_filter() when user space calls ioctl(tun_fd, TUN{ATTACH,
DETACH}FILTER, ...) for adding/removing a BPF filter on tap devices.

Since the fix in f91ff5b9ff52 ("net: sk_{detach|attach}_filter() rcu
fixes") sk_attach_filter()/sk_detach_filter() now dereferences the
filter with rcu_dereference_protected(), checking whether socket lock
is held in control path.

Since its introduction in 994051625981 ("tun: socket filter support"),
tap filters are managed under RTNL lock from __tun_chr_ioctl(). Thus the
sock_owned_by_user(sk) doesn't apply in this specific case and therefore
triggers the false positive.

Extend the BPF API with __sk_attach_filter()/__sk_detach_filter() pair
that is used by tap filters and pass in lockdep_rtnl_is_held() for the
rcu_dereference_protected() checks instead.

Reported-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index afdf950..510e90a 100644 (file)
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -622,7 +622,8 @@ static int tun_attach(struct tun_struct *tun, struct file *file, bool skip_filte
 
        /* Re-attach the filter to persist device */
        if (!skip_filter && (tun->filter_attached == true)) {
-               err = sk_attach_filter(&tun->fprog, tfile->socket.sk);
+               err = __sk_attach_filter(&tun->fprog, tfile->socket.sk,
+                                        lockdep_rtnl_is_held());
                if (!err)
                        goto out;
        }
@@ -1822,7 +1823,7 @@ static void tun_detach_filter(struct tun_struct *tun, int n)
 
        for (i = 0; i < n; i++) {
                tfile = rtnl_dereference(tun->tfiles[i]);
-               sk_detach_filter(tfile->socket.sk);
+               __sk_detach_filter(tfile->socket.sk, lockdep_rtnl_is_held());
        }
 
        tun->filter_attached = false;
@@ -1835,7 +1836,8 @@ static int tun_attach_filter(struct tun_struct *tun)
 
        for (i = 0; i < tun->numqueues; i++) {
                tfile = rtnl_dereference(tun->tfiles[i]);
-               ret = sk_attach_filter(&tun->fprog, tfile->socket.sk);
+               ret = __sk_attach_filter(&tun->fprog, tfile->socket.sk,
+                                        lockdep_rtnl_is_held());
                if (ret) {
                        tun_detach_filter(tun, i);
                        return ret;

diff --git a/include/linux/filter.h b/include/linux/filter.h
index 43aa1f8..a51a536 100644 (file)
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -465,10 +465,14 @@ int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog,
 void bpf_prog_destroy(struct bpf_prog *fp);
 
 int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk);
+int __sk_attach_filter(struct sock_fprog *fprog, struct sock *sk,
+                      bool locked);
 int sk_attach_bpf(u32 ufd, struct sock *sk);
 int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk);
 int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk);
 int sk_detach_filter(struct sock *sk);
+int __sk_detach_filter(struct sock *sk, bool locked);
+
 int sk_get_filter(struct sock *sk, struct sock_filter __user *filter,
                  unsigned int len);
 

diff --git a/net/core/filter.c b/net/core/filter.c
index 4b81b71..ca7f832 100644 (file)
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -1149,7 +1149,8 @@ void bpf_prog_destroy(struct bpf_prog *fp)
 }
 EXPORT_SYMBOL_GPL(bpf_prog_destroy);
 
-static int __sk_attach_prog(struct bpf_prog *prog, struct sock *sk)
+static int __sk_attach_prog(struct bpf_prog *prog, struct sock *sk,
+                           bool locked)
 {
        struct sk_filter *fp, *old_fp;
 
@@ -1165,10 +1166,8 @@ static int __sk_attach_prog(struct bpf_prog *prog, struct sock *sk)
                return -ENOMEM;
        }
 
-       old_fp = rcu_dereference_protected(sk->sk_filter,
-                                          sock_owned_by_user(sk));
+       old_fp = rcu_dereference_protected(sk->sk_filter, locked);
        rcu_assign_pointer(sk->sk_filter, fp);
-
        if (old_fp)
                sk_filter_uncharge(sk, old_fp);
 
@@ -1247,7 +1246,8 @@ struct bpf_prog *__get_filter(struct sock_fprog *fprog, struct sock *sk)
  * occurs or there is insufficient memory for the filter a negative
  * errno code is returned. On success the return is zero.
  */
-int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk)
+int __sk_attach_filter(struct sock_fprog *fprog, struct sock *sk,
+                      bool locked)
 {
        struct bpf_prog *prog = __get_filter(fprog, sk);
        int err;
@@ -1255,7 +1255,7 @@ int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk)
        if (IS_ERR(prog))
                return PTR_ERR(prog);
 
-       err = __sk_attach_prog(prog, sk);
+       err = __sk_attach_prog(prog, sk, locked);
        if (err < 0) {
                __bpf_prog_release(prog);
                return err;
@@ -1263,7 +1263,12 @@ int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk)
 
        return 0;
 }
-EXPORT_SYMBOL_GPL(sk_attach_filter);
+EXPORT_SYMBOL_GPL(__sk_attach_filter);
+
+int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk)
+{
+       return __sk_attach_filter(fprog, sk, sock_owned_by_user(sk));
+}
 
 int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk)
 {
@@ -1309,7 +1314,7 @@ int sk_attach_bpf(u32 ufd, struct sock *sk)
        if (IS_ERR(prog))
                return PTR_ERR(prog);
 
-       err = __sk_attach_prog(prog, sk);
+       err = __sk_attach_prog(prog, sk, sock_owned_by_user(sk));
        if (err < 0) {
                bpf_prog_put(prog);
                return err;
@@ -2250,7 +2255,7 @@ static int __init register_sk_filter_ops(void)
 }
 late_initcall(register_sk_filter_ops);
 
-int sk_detach_filter(struct sock *sk)
+int __sk_detach_filter(struct sock *sk, bool locked)
 {
        int ret = -ENOENT;
        struct sk_filter *filter;
@@ -2258,8 +2263,7 @@ int sk_detach_filter(struct sock *sk)
        if (sock_flag(sk, SOCK_FILTER_LOCKED))
                return -EPERM;
 
-       filter = rcu_dereference_protected(sk->sk_filter,
-                                          sock_owned_by_user(sk));
+       filter = rcu_dereference_protected(sk->sk_filter, locked);
        if (filter) {
                RCU_INIT_POINTER(sk->sk_filter, NULL);
                sk_filter_uncharge(sk, filter);
@@ -2268,7 +2272,12 @@ int sk_detach_filter(struct sock *sk)
 
        return ret;
 }
-EXPORT_SYMBOL_GPL(sk_detach_filter);
+EXPORT_SYMBOL_GPL(__sk_detach_filter);
+
+int sk_detach_filter(struct sock *sk)
+{
+       return __sk_detach_filter(sk, sock_owned_by_user(sk));
+}
 
 int sk_get_filter(struct sock *sk, struct sock_filter __user *ubuf,
                  unsigned int len)