netdev - [PATCH bpf-next 01/15] selftests/bpf: Fix the u64_offset_to_skb

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Date: Wed, 20 Dec 2023 23:39:59 +0200
From: Maxim Mikityanskiy <maxtram95@...il.com>
To: Eduard Zingerman <eddyz87@...il.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>
Cc: John Fastabend <john.fastabend@...il.com>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...gle.com>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Mykola Lysenko <mykolal@...com>,
	Shuah Khan <shuah@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	bpf@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	netdev@...r.kernel.org,
	Maxim Mikityanskiy <maxim@...valent.com>
Subject: [PATCH bpf-next 01/15] selftests/bpf: Fix the u64_offset_to_skb_data test

From: Maxim Mikityanskiy <maxim@...valent.com>

The u64_offset_to_skb_data test is supposed to make a 64-bit fill, but
instead makes a 16-bit one. Fix the test according to its intention. The
16-bit fill is covered by u16_offset_to_skb_data.

Signed-off-by: Maxim Mikityanskiy <maxim@...valent.com>
---
 tools/testing/selftests/bpf/progs/verifier_spill_fill.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/bpf/progs/verifier_spill_fill.c b/tools/testing/selftests/bpf/progs/verifier_spill_fill.c
index 39fe3372e0e0..84eccab36582 100644
--- a/tools/testing/selftests/bpf/progs/verifier_spill_fill.c
+++ b/tools/testing/selftests/bpf/progs/verifier_spill_fill.c
@@ -243,7 +243,7 @@ l0_%=:	r0 = 0;						\
 
 SEC("tc")
 __description("Spill u32 const scalars.  Refill as u64.  Offset to skb->data")
-__failure __msg("invalid access to packet")
+__failure __msg("math between pkt pointer and register with unbounded min value is not allowed")
 __naked void u64_offset_to_skb_data(void)
 {
 	asm volatile ("					\
@@ -253,7 +253,7 @@ __naked void u64_offset_to_skb_data(void)
 	w7 = 20;					\
 	*(u32*)(r10 - 4) = r6;				\
 	*(u32*)(r10 - 8) = r7;				\
-	r4 = *(u16*)(r10 - 8);				\
+	r4 = *(u64*)(r10 - 8);				\
 	r0 = r2;					\
 	/* r0 += r4 R0=pkt R2=pkt R3=pkt_end R4=umax=65535 */\
 	r0 += r4;					\
-- 
2.42.1