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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 f91ff5b9ff ("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 9940516259 ("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>
This commit is contained in:
Daniel Borkmann 2016-03-31 02:13:18 +02:00 committed by David S. Miller
parent 79f4223257
commit 5a5abb1fa3
3 changed files with 30 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/net/tun.c
View File

@ -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;

4
include/linux/filter.h
View File

@ -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);

33
net/core/filter.c
View File

@ -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)