On 2018/05/28 11:24, Jason Wang wrote:
> On 2018年05月25日 21:43, Toshiaki Makita wrote:
>
> [...]
>
@@ -1917,16 +1923,22 @@ static ssize_t tun_get_user(struct
tun_struct *tun, struct tun_file *tfile,
struct bpf_prog *xdp_prog;
int ret;
+ local_bh_
On 2018年05月25日 21:43, Toshiaki Makita wrote:
[...]
@@ -1917,16 +1923,22 @@ static ssize_t tun_get_user(struct
tun_struct *tun, struct tun_file *tfile,
struct bpf_prog *xdp_prog;
int ret;
+ local_bh_disable();
+ preempt_disable();
rcu_read_lock();
On 18/05/25 (金) 18:59, Jason Wang wrote:
On 2018年05月25日 12:32, Toshiaki Makita wrote:
Calling XDP redirection requires preempt/bh disabled. Especially softirq
can call another XDP function and redirection functions, then percpu
value ri->map can be overwritten to NULL.
This is a generic XDP cas
On 2018年05月25日 12:32, Toshiaki Makita wrote:
Calling XDP redirection requires preempt/bh disabled. Especially softirq
can call another XDP function and redirection functions, then percpu
value ri->map can be overwritten to NULL.
This is a generic XDP case called from tun.
[ 3535.736058] BUG:
Calling XDP redirection requires preempt/bh disabled. Especially softirq
can call another XDP function and redirection functions, then percpu
value ri->map can be overwritten to NULL.
This is a generic XDP case called from tun.
[ 3535.736058] BUG: unable to handle kernel NULL pointer dereference
