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Message-ID: <20240108205209.838365-2-maxtram95@gmail.com>
Date: Mon, 8 Jan 2024 22:51:55 +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>,
Shung-Hsi Yu <shung-hsi.yu@...e.com>
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 v2 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 and
update the comments accordingly (umax is no longer 0xffff). The 16-bit
fill is covered by u16_offset_to_skb_data.
Signed-off-by: Maxim Mikityanskiy <maxim@...valent.com>
Acked-by: Eduard Zingerman <eddyz87@...il.com>
---
tools/testing/selftests/bpf/progs/verifier_spill_fill.c | 8 +++-----
1 file changed, 3 insertions(+), 5 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..848f2930f599 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 (" \
@@ -253,13 +253,11 @@ __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 R0=pkt R2=pkt R3=pkt_end R4= */ \
r0 += r4; \
- /* if (r0 > r3) R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=umax=65535 */\
if r0 > r3 goto l0_%=; \
- /* r0 = *(u32 *)r2 R0=pkt,umax=65535 R2=pkt R3=pkt_end R4=20 */\
r0 = *(u32*)(r2 + 0); \
l0_%=: r0 = 0; \
exit; \
--
2.43.0
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