From: Jakub Kicinski <kuba@kernel.org>
To: Eduard Zingerman <eddyz87@gmail.com>
Cc: syzbot <syzbot+291100dcb32190ec02a8@syzkaller.appspotmail.com>,
andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org,
daniel@iogearbox.net, davem@davemloft.net, haoluo@google.com,
hawk@kernel.org, john.fastabend@gmail.com, jolsa@kernel.org,
kpsingh@kernel.org, linux-kernel@vger.kernel.org,
martin.lau@linux.dev, netdev@vger.kernel.org, sdf@google.com,
song@kernel.org, syzkaller-bugs@googlegroups.com,
yonghong.song@linux.dev
Subject: Re: [syzbot] [bpf?] general protection fault in bpf_prog_offload_verifier_prep
Date: Wed, 6 Sep 2023 07:57:30 -0700 [thread overview]
Message-ID: <20230906075730.6d61420a@kernel.org> (raw)
In-Reply-To: <f3eacce9566d14141cb591dc8364123b809841cb.camel@gmail.com>
On Wed, 06 Sep 2023 16:50:23 +0300 Eduard Zingerman wrote:
> diff --git a/kernel/bpf/offload.c b/kernel/bpf/offload.c
> index 3e4f2ec1af06..302e38bffffa 100644
> --- a/kernel/bpf/offload.c
> +++ b/kernel/bpf/offload.c
> @@ -199,12 +199,11 @@ static int __bpf_prog_dev_bound_init(struct bpf_prog *prog, struct net_device *n
> offload->netdev = netdev;
>
> ondev = bpf_offload_find_netdev(offload->netdev);
> + if (bpf_prog_is_offloaded(prog->aux) && (!ondev || !ondev->offdev)) {
> + err = -EINVAL;
> + goto err_free;
> + }
> if (!ondev) {
> - if (bpf_prog_is_offloaded(prog->aux)) {
> - err = -EINVAL;
> - goto err_free;
> - }
> -
> /* When only binding to the device, explicitly
> * create an entry in the hashtable.
> */
LGTM, FWIW.
> With the following reasoning: for offloaded programs offload device
> should exist and it should not be a fake device create in !ondev branch.
>
> Stanislav, could you please take a look? I think this is related to commit:
> 2b3486bc2d23 ("bpf: Introduce device-bound XDP programs")
next prev parent reply other threads:[~2023-09-06 14:57 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-03 19:55 [syzbot] [bpf?] general protection fault in bpf_prog_offload_verifier_prep syzbot
2023-09-06 12:40 ` Eduard Zingerman
2023-09-06 13:50 ` Eduard Zingerman
2023-09-06 13:54 ` Daniel Borkmann
2023-09-06 14:57 ` Jakub Kicinski [this message]
2023-09-06 18:00 ` Eduard Zingerman
2023-09-06 18:34 ` Stanislav Fomichev
2023-09-09 16:12 ` syzbot
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