From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from m16.mail.163.com (m16.mail.163.com [220.197.31.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5E2BF3DA7C8; Sun, 20 Sep 2026 06:35:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.31.2 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789886156; cv=none; b=knVn+iov5egBfaa9NEzWlPECtUmDW5FEgcGCmjk2Cr6HXYvq7/hYRSQzesYNo82cUZVMKw4PxA2IU9w8eKqe7KQNBsAHW2bTAXf5voMZiyg+xgDX33bpxhVCWhkfIVgctPLJf2nXGULq54+nR+WRGUMoIBs6d/i/fUalvvmoE3s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789886156; c=relaxed/simple; bh=f3kEV6qCWROIy4is1IzV6l2A5scYFq8hQZHNNsWqp/M=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=SBwStihdFAApyW7poW1UXnKVM4MYrEH/LGIrgFJNGJ99aOBwbOuHVS0StPRIE9yQns+9iGCZPYO/qJ2PmGsDZrRb8dz4k/XLAY+9KWq8wwfQnX0JMsZDOXwDKNqjZYaJw5emUJo1BsjNOeTCpRllXxH8SDv8PywyOQy9SbUEUbY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=LbO4g6Mp; arc=none smtp.client-ip=220.197.31.2 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="LbO4g6Mp" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=h+ Xk56gXA8V+uCWJm4Hp2x1B0l2K4jdoVWRG3XTXLjw=; b=LbO4g6MpuPBhySYxtq KYjGy6U1rl3Rlm8BJ06V/jgw6oWEe09AcqwYO6Yq3R4pyW2ILslcOUQNs4dsNKJi ATIgk8x3oPQXzHYBumlgFvI82M+caoiId7gR1c3r6ZI3wRmQV7DMSn9qP6CTVk1V 0O1jksZrIjiMIjgylAH/nE5xI= Received: from localhost.localdomain (unknown []) by gzga-smtp-mtada-g1-4 (Coremail) with SMTP id _____wD3F8OCfq9qG42sBw--.49698S3; Sun, 20 Sep 2026 14:34:44 +0800 (CST) From: Feng Yang To: kpsingh@kernel.org, matt@bobrowski.net, song@kernel.org, jolsa@kernel.org, ihor.solodrai@linux.dev, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, eddyz87@gmail.com, memxor@gmail.com, martin.lau@linux.dev, yonghong.song@linux.dev, emil@etsalapatis.com, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH bpf-next 2/2] selftests/bpf: Check bpf_skb_output() tracing restrictions Date: Sun, 20 Sep 2026 14:34:42 +0800 Message-Id: <20260920063442.499577-2-yangfeng59949@163.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260920063442.499577-1-yangfeng59949@163.com> References: <20260920063442.499577-1-yangfeng59949@163.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID:_____wD3F8OCfq9qG42sBw--.49698S3 X-Coremail-Antispam: 1Uf129KBjvJXoW7ZFy5JrW5AF48KF4rur45ZFb_yoW8uw13p3 Wkt39xKrykXF42gw4fAa1xZwnIqa1kZrWYvr4Sqw1ayr43Xrs7XF1IkF4Ygw1fZr4UuryF vrW2gFW7Aw4kAF7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x07j12NtUUUUU= X-CM-SenderInfo: p1dqww5hqjkmqzuzqiywtou0bp/xtbC8gVHv2qvfoWOSgAA31 From: Feng Yang Add verifier coverage for the bpf_skb_output() tracing policy. Verify that an fentry program can still use the helper, while the equivalent fexit program is rejected at load time. Signed-off-by: Yun Lu Signed-off-by: Feng Yang --- .../bpf/progs/verifier_helper_restricted.c | 32 +++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/tools/testing/selftests/bpf/progs/verifier_helper_restricted.c b/tools/testing/selftests/bpf/progs/verifier_helper_restricted.c index 889c9b78b912..058e71927cd5 100644 --- a/tools/testing/selftests/bpf/progs/verifier_helper_restricted.c +++ b/tools/testing/selftests/bpf/progs/verifier_helper_restricted.c @@ -3,6 +3,7 @@ #include #include +#include #include "bpf_misc.h" struct val { @@ -17,6 +18,13 @@ struct { __type(value, struct val); } map_spin_lock SEC(".maps"); +struct { + __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); + __uint(max_entries, 1); + __type(key, __u32); + __type(value, __u32); +} perf_event_map SEC(".maps"); + SEC("kprobe") __description("bpf_ktime_get_coarse_ns is forbidden in BPF_PROG_TYPE_KPROBE") __failure __msg("program of this type cannot use helper bpf_ktime_get_coarse_ns") @@ -165,4 +173,28 @@ l0_%=: exit; \ : __clobber_all); } +SEC("fentry/skb_tx_error") +__description("bpf_skb_output is allowed in BPF_TRACE_FENTRY") +__success +int BPF_PROG(skb_output_fentry, void *skb) +{ + __u64 meta = 0; + + bpf_skb_output(skb, &perf_event_map, BPF_F_CURRENT_CPU, + &meta, sizeof(meta)); + return 0; +} + +SEC("fexit/skb_tx_error") +__description("bpf_skb_output is forbidden in BPF_TRACE_FEXIT") +__failure __msg("program of this type cannot use helper bpf_skb_output") +int BPF_PROG(skb_output_fexit, void *skb) +{ + __u64 meta = 0; + + bpf_skb_output(skb, &perf_event_map, BPF_F_CURRENT_CPU, + &meta, sizeof(meta)); + return 0; +} + char _license[] SEC("license") = "GPL"; -- 2.43.0