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tun: Assign missing bpf_net_context.

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During the introduction of struct bpf_net_context handling for
XDP-redirect, the tun driver has been missed.
Jakub also pointed out that there is another call chain to
do_xdp_generic() originating from netif_receive_skb() and drivers may
use it outside from the NAPI context.

Set the bpf_net_context before invoking BPF XDP program within the TUN
driver. Set the bpf_net_context also in do_xdp_generic() if a xdp
program is available.

Reported-by: syzbot+0b5c75599f1d872bea6f@syzkaller.appspotmail.com
Reported-by: syzbot+5ae46b237278e2369cac@syzkaller.appspotmail.com
Reported-by: syzbot+c1e04a422bbc0f0f2921@syzkaller.appspotmail.com
Fixes: 401cb7dae8 ("net: Reference bpf_redirect_info via task_struct on PREEMPT_RT.")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://patch.msgid.link/20240704144815.j8xQda5r@linutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Sebastian Andrzej Siewior
2024-07-04 16:48:15 +02:00
committed by Jakub Kicinski
parent 3b2aef9922
commit fecef4cd42
2 changed files with 12 additions and 0 deletions
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5
net/core/dev.c
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@@ -5126,11 +5126,14 @@ static DEFINE_STATIC_KEY_FALSE(generic_xdp_needed_key);
int do_xdp_generic(struct bpf_prog *xdp_prog, struct sk_buff **pskb)
{
struct bpf_net_context __bpf_net_ctx, *bpf_net_ctx;
if (xdp_prog) {
struct xdp_buff xdp;
u32 act;
int err;
bpf_net_ctx = bpf_net_ctx_set(&__bpf_net_ctx);
act = netif_receive_generic_xdp(pskb, &xdp, xdp_prog);
if (act != XDP_PASS) {
switch (act) {
@@ -5144,11 +5147,13 @@ int do_xdp_generic(struct bpf_prog *xdp_prog, struct sk_buff **pskb)
generic_xdp_tx(*pskb, xdp_prog);
break;
}
bpf_net_ctx_clear(bpf_net_ctx);
return XDP_DROP;
}
}
return XDP_PASS;
out_redir:
bpf_net_ctx_clear(bpf_net_ctx);
kfree_skb_reason(*pskb, SKB_DROP_REASON_XDP);
return XDP_DROP;
}