From patchwork Thu Jul 4 06:48:04 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geliang Tang X-Patchwork-Id: 13723312 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 1B5AB1BC4E; Thu, 4 Jul 2024 06:48:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720075725; cv=none; b=U7l3SkVTBZE+wSrykS1xvxFfGQQpOXO9UcrwJdrV/LPaGOya6ayPnky99v0tXlUl1aHY1dcWrqnM+E/c+zc6FFinPeB/8sI77JCdGTcV8iw+2ly1TywOG5ygYG1Zbob1cJudDNVcNu0cCdXALuOSx0GJ+57mJam9wvjMnCjVj0Q= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720075725; c=relaxed/simple; bh=Mb8k4zWoJ3BhIpD2KKINFF2veb6v9T7oCfAwzClcDKQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hT8U5m3xzW/PTH9ieVhTVNORSoqQIFnkBzi4l0iGV871wQp5PHnINrNv9Go9ElX6lp5y9trR//fouCaeQJNeGcMLp5BgT+eWiKXSEZ2EcdnO5kzC3nc2j8lBeDloS8Q7nipQtJyxS6PnUgbMNwMuu24/AYV3wCPJR+GT6m1PXgQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Nw3zmwCo; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Nw3zmwCo" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8E76AC3277B; Thu, 4 Jul 2024 06:48:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1720075724; bh=Mb8k4zWoJ3BhIpD2KKINFF2veb6v9T7oCfAwzClcDKQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Nw3zmwCoPdWbH9zM9j2+iyf0n9tgDm9uVm4PbW3frlBvPTvyTGeseaF0+wfeQmFT1 lGk8bHut8dSDLbz8kGJN3VPDv+vuKF/o9vu7Z8Da+NeZrsrZ91P3tlXV7Frvm2b5F6 Bt3Tli5tW1/ONktSKBwwJ6nHI7zpACJ+rq0zUcLiSyoLfA1ozev5tHSpEzq45T7TIZ NItuH3vdFtt7DYtoOhzdQsEizM/cJTsVlGc7zehgCM2AUHRZT5Z7sQoMHVSlcg6VNv /CR0Oh78anHe6a8pFfDoYk/HIrNDaPcOdGtaYnb/kEwNN7m8p1wUeOtwFL1W59T1lP RNSs7rFBfcbmQ== From: Geliang Tang To: Andrii Nakryiko , Eduard Zingerman , Mykola Lysenko , Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Shuah Khan Cc: Geliang Tang , bpf@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH 4/6] selftests/bpf: Null checks for link in bpf_tcp_ca Date: Thu, 4 Jul 2024 14:48:04 +0800 Message-ID: X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Geliang Tang Run bpf_tcp_ca selftests (./test_progs -t bpf_tcp_ca) on a Loongarch platform, some "Segmentation fault" errors occur: ''' test_dctcp:PASS:bpf_dctcp__open_and_load 0 nsec test_dctcp:FAIL:bpf_map__attach_struct_ops unexpected error: -524 #29/1 bpf_tcp_ca/dctcp:FAIL test_cubic:PASS:bpf_cubic__open_and_load 0 nsec test_cubic:FAIL:bpf_map__attach_struct_ops unexpected error: -524 #29/2 bpf_tcp_ca/cubic:FAIL test_dctcp_fallback:PASS:dctcp_skel 0 nsec test_dctcp_fallback:PASS:bpf_dctcp__load 0 nsec test_dctcp_fallback:FAIL:dctcp link unexpected error: -524 #29/4 bpf_tcp_ca/dctcp_fallback:FAIL test_write_sk_pacing:PASS:open_and_load 0 nsec test_write_sk_pacing:FAIL:attach_struct_ops unexpected error: -524 #29/6 bpf_tcp_ca/write_sk_pacing:FAIL test_update_ca:PASS:open 0 nsec test_update_ca:FAIL:attach_struct_ops unexpected error: -524 settcpca:FAIL:setsockopt unexpected setsockopt: \ actual -1 == expected -1 (network_helpers.c:99: errno: No such file or directory) \ Failed to call post_socket_cb start_test:FAIL:start_server_str unexpected start_server_str: \ actual -1 == expected -1 test_update_ca:FAIL:ca1_ca1_cnt unexpected ca1_ca1_cnt: \ actual 0 <= expected 0 #29/9 bpf_tcp_ca/update_ca:FAIL #29 bpf_tcp_ca:FAIL Caught signal #11! Stack trace: ./test_progs(crash_handler+0x28)[0x5555567ed91c] linux-vdso.so.1(__vdso_rt_sigreturn+0x0)[0x7ffffee408b0] ./test_progs(bpf_link__update_map+0x80)[0x555556824a78] ./test_progs(+0x94d68)[0x5555564c4d68] ./test_progs(test_bpf_tcp_ca+0xe8)[0x5555564c6a88] ./test_progs(+0x3bde54)[0x5555567ede54] ./test_progs(main+0x61c)[0x5555567efd54] /usr/lib64/libc.so.6(+0x22208)[0x7ffff2aaa208] /usr/lib64/libc.so.6(__libc_start_main+0xac)[0x7ffff2aaa30c] ./test_progs(_start+0x48)[0x55555646bca8] Segmentation fault ''' This is because "link" returned by bpf_map__attach_struct_ops() is NULL in this case. test_progs crashs when this NULL link passes to bpf_link__update_map(). This patch adds NULL checks for all links in bpf_tcp_ca to fix these errors. If "link" is NULL, goto the newly added label "err" to destroy the skel. v2: - use "goto err" instead of "return" as Eduard suggested. Signed-off-by: Geliang Tang --- .../selftests/bpf/prog_tests/bpf_tcp_ca.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c b/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c index fa2efb246d3b..45a21a064437 100644 --- a/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c +++ b/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c @@ -407,7 +407,8 @@ static void test_update_ca(void) return; link = bpf_map__attach_struct_ops(skel->maps.ca_update_1); - ASSERT_OK_PTR(link, "attach_struct_ops"); + if (!ASSERT_OK_PTR(link, "attach_struct_ops")) + goto err; do_test(&opts); saved_ca1_cnt = skel->bss->ca1_cnt; @@ -421,6 +422,7 @@ static void test_update_ca(void) ASSERT_GT(skel->bss->ca2_cnt, 0, "ca2_ca2_cnt"); bpf_link__destroy(link); +err: tcp_ca_update__destroy(skel); } @@ -443,7 +445,8 @@ static void test_update_wrong(void) return; link = bpf_map__attach_struct_ops(skel->maps.ca_update_1); - ASSERT_OK_PTR(link, "attach_struct_ops"); + if (!ASSERT_OK_PTR(link, "attach_struct_ops")) + goto err; do_test(&opts); saved_ca1_cnt = skel->bss->ca1_cnt; @@ -456,6 +459,7 @@ static void test_update_wrong(void) ASSERT_GT(skel->bss->ca1_cnt, saved_ca1_cnt, "ca2_ca1_cnt"); bpf_link__destroy(link); +err: tcp_ca_update__destroy(skel); } @@ -480,7 +484,8 @@ static void test_mixed_links(void) ASSERT_OK_PTR(link_nl, "attach_struct_ops_nl"); link = bpf_map__attach_struct_ops(skel->maps.ca_update_1); - ASSERT_OK_PTR(link, "attach_struct_ops"); + if (!ASSERT_OK_PTR(link, "attach_struct_ops")) + goto err; do_test(&opts); ASSERT_GT(skel->bss->ca1_cnt, 0, "ca1_ca1_cnt"); @@ -489,6 +494,7 @@ static void test_mixed_links(void) ASSERT_ERR(err, "update_map"); bpf_link__destroy(link); +err: bpf_link__destroy(link_nl); tcp_ca_update__destroy(skel); } @@ -532,7 +538,8 @@ static void test_link_replace(void) bpf_link__destroy(link); link = bpf_map__attach_struct_ops(skel->maps.ca_update_2); - ASSERT_OK_PTR(link, "attach_struct_ops_2nd"); + if (!ASSERT_OK_PTR(link, "attach_struct_ops_2nd")) + goto err; /* BPF_F_REPLACE with a wrong old map Fd. It should fail! * @@ -555,6 +562,7 @@ static void test_link_replace(void) bpf_link__destroy(link); +err: tcp_ca_update__destroy(skel); }