linux-kernel - Re: [PATCH] bpf: Ensure BPF programs testing skb context initialization

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Message-ID: <20240715181339.2489649-1-michal.switala@infogain.com>
Date: Mon, 15 Jul 2024 20:13:39 +0200
From: Michal Switala <michal.switala@...ogain.com>
To: alexei.starovoitov@...il.com
Cc: bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	michal.switala@...ogain.com,
	netdev@...r.kernel.org,
	revest@...gle.com,
	syzbot+cca39e6e84a367a7e6f6@...kaller.appspotmail.com
Subject: Re: [PATCH] bpf: Ensure BPF programs testing skb context initialization

Hi,

The reproducer calls the methods bpf_prog_test_run_xdp and
bpf_prog_test_run_skb. Both lead to the invocation of dev_map_enqueue, in the
case of the former, the backtrace is recorded in its entirety, whereas for the
latter it is not. I think the bug might be incorrectly reported on syzkaller, as
during GDB debugging, the problem occurred in functions called from
bpf_prog_test_run_skb. I also ran testing of my patch on syzkaller and the tests
passed.

Regards
Michal