lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20240911033719.91468-4-lulie@linux.alibaba.com>
Date: Wed, 11 Sep 2024 11:37:17 +0800
From: Philo Lu <lulie@...ux.alibaba.com>
To: bpf@...r.kernel.org
Cc: edumazet@...gle.com,
	rostedt@...dmis.org,
	mhiramat@...nel.org,
	mathieu.desnoyers@...icios.com,
	martin.lau@...ux.dev,
	ast@...nel.org,
	daniel@...earbox.net,
	andrii@...nel.org,
	eddyz87@...il.com,
	song@...nel.org,
	yonghong.song@...ux.dev,
	john.fastabend@...il.com,
	kpsingh@...nel.org,
	sdf@...ichev.me,
	haoluo@...gle.com,
	jolsa@...nel.org,
	davem@...emloft.net,
	kuba@...nel.org,
	pabeni@...hat.com,
	mykolal@...com,
	shuah@...nel.org,
	mcoquelin.stm32@...il.com,
	alexandre.torgue@...s.st.com,
	thinker.li@...il.com,
	juntong.deng@...look.com,
	jrife@...gle.com,
	alan.maguire@...cle.com,
	davemarchevsky@...com,
	dxu@...uu.xyz,
	vmalik@...hat.com,
	cupertino.miranda@...cle.com,
	mattbobrowski@...gle.com,
	xuanzhuo@...ux.alibaba.com,
	netdev@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org
Subject: [PATCH bpf-next v3 3/5] tcp: Use skb__nullable in trace_tcp_send_reset

Replace skb with skb__nullable as the argument name. The suffix tells
bpf verifier through btf that the arg could be NULL and should be
checked in tp_btf prog.

For now, this is the only nullable argument in tcp tracepoints.

Signed-off-by: Philo Lu <lulie@...ux.alibaba.com>
Acked-by: Jakub Kicinski <kuba@...nel.org>
---
 include/trace/events/tcp.h | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/include/trace/events/tcp.h b/include/trace/events/tcp.h
index 1c8bd8e186b89..a27c4b619dffd 100644
--- a/include/trace/events/tcp.h
+++ b/include/trace/events/tcp.h
@@ -91,10 +91,10 @@ DEFINE_RST_REASON(FN, FN)
 TRACE_EVENT(tcp_send_reset,
 
 	TP_PROTO(const struct sock *sk,
-		 const struct sk_buff *skb,
+		 const struct sk_buff *skb__nullable,
 		 const enum sk_rst_reason reason),
 
-	TP_ARGS(sk, skb, reason),
+	TP_ARGS(sk, skb__nullable, reason),
 
 	TP_STRUCT__entry(
 		__field(const void *, skbaddr)
@@ -106,7 +106,7 @@ TRACE_EVENT(tcp_send_reset,
 	),
 
 	TP_fast_assign(
-		__entry->skbaddr = skb;
+		__entry->skbaddr = skb__nullable;
 		__entry->skaddr = sk;
 		/* Zero means unknown state. */
 		__entry->state = sk ? sk->sk_state : 0;
@@ -118,13 +118,13 @@ TRACE_EVENT(tcp_send_reset,
 			const struct inet_sock *inet = inet_sk(sk);
 
 			TP_STORE_ADDR_PORTS(__entry, inet, sk);
-		} else if (skb) {
-			const struct tcphdr *th = (const struct tcphdr *)skb->data;
+		} else if (skb__nullable) {
+			const struct tcphdr *th = (const struct tcphdr *)skb__nullable->data;
 			/*
 			 * We should reverse the 4-tuple of skb, so later
 			 * it can print the right flow direction of rst.
 			 */
-			TP_STORE_ADDR_PORTS_SKB(skb, th, entry->daddr, entry->saddr);
+			TP_STORE_ADDR_PORTS_SKB(skb__nullable, th, entry->daddr, entry->saddr);
 		}
 		__entry->reason = reason;
 	),
-- 
2.32.0.3.g01195cf9f


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ