From patchwork Wed Sep 11 03:37:19 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Philo Lu X-Patchwork-Id: 13799644 Received: from out30-118.freemail.mail.aliyun.com (out30-118.freemail.mail.aliyun.com [115.124.30.118]) (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 3C9F64D8D0; Wed, 11 Sep 2024 03:37:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.118 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726025853; cv=none; b=R53uyECQFg94Cw3LOKslH4BBl39ozn78iXKNvzmQpQLwjDE/H1/kHGFpdMrkIl3J8UHIo+1YoUclAFZJKOK8QGhpiWtjdNiAhEuxq2/pURjnEXXG7EEzzH0UJ7QK0EoGp1iCPQjGUd0/r/nTFPAmO0UWR/Y43K+iYPS+mzvN8rc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726025853; c=relaxed/simple; bh=fQA4ZmvJjUsqFOFX7s+On/lT0lNIldNAFmE9GyYmXH4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=V0bYsW6pzp6QCxTL7CHm5otLTV4QW6FsikCSHvW5O6AkOq5IGOvsqtht0j7x+yythnfm/E7Zlu0aNf/OVSgpaBPnj1N1Xb3WYbrxP4a7JBr3aPj55Qohn1PEuhdSiB+zf138ofP7/EA/66PZbhoMZoi21J4Vz0oNgA/1w5LFor4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=eY88Uns3; arc=none smtp.client-ip=115.124.30.118 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="eY88Uns3" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1726025849; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=kt0hxrOo2gJqVz1HQLnyjblcCFmCzmyTJPG3om2eI2M=; b=eY88Uns37ojjTnGt4S10fZDjIUyfsiTGgqdEKL22BL9tFoxbOozZMdqPjjN5IADeoISgrQ6adDINp924ZtUZ4kiUkj1/3UVz39Hekc6smbqZtsG5odMU2aptMb7nGUNHc3OwPbHkavOxMjvikB+LSaWB4oRGdKKMlqseNCDNR18= Received: from localhost(mailfrom:lulie@linux.alibaba.com fp:SMTPD_---0WEmDPhO_1726025847) by smtp.aliyun-inc.com; Wed, 11 Sep 2024 11:37:27 +0800 From: Philo Lu To: bpf@vger.kernel.org Cc: edumazet@google.com, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, martin.lau@linux.dev, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, eddyz87@gmail.com, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, davem@davemloft.net, kuba@kernel.org, pabeni@redhat.com, mykolal@fb.com, shuah@kernel.org, mcoquelin.stm32@gmail.com, alexandre.torgue@foss.st.com, thinker.li@gmail.com, juntong.deng@outlook.com, jrife@google.com, alan.maguire@oracle.com, davemarchevsky@fb.com, dxu@dxuuu.xyz, vmalik@redhat.com, cupertino.miranda@oracle.com, mattbobrowski@google.com, xuanzhuo@linux.alibaba.com, netdev@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH bpf-next v3 5/5] selftests/bpf: Expand skb dynptr selftests for tp_btf Date: Wed, 11 Sep 2024 11:37:19 +0800 Message-Id: <20240911033719.91468-6-lulie@linux.alibaba.com> X-Mailer: git-send-email 2.32.0.3.g01195cf9f In-Reply-To: <20240911033719.91468-1-lulie@linux.alibaba.com> References: <20240911033719.91468-1-lulie@linux.alibaba.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add 3 test cases for skb dynptr used in tp_btf: - test_dynptr_skb_tp_btf: use skb dynptr in tp_btf and make sure it is read-only. - skb_invalid_ctx_fentry/skb_invalid_ctx_fexit: bpf_dynptr_from_skb should fail in fentry/fexit. In test_dynptr_skb_tp_btf, to trigger the tracepoint in kfree_skb, test_pkt_access is used for its test_run, as in kfree_skb.c. Because the test process is different from others, a new setup type is defined, i.e., SETUP_SKB_PROG_TP. The result is like: $ ./test_progs -t 'dynptr/test_dynptr_skb_tp_btf' #84/14 dynptr/test_dynptr_skb_tp_btf:OK #84 dynptr:OK #127 kfunc_dynptr_param:OK Summary: 2/1 PASSED, 0 SKIPPED, 0 FAILED $ ./test_progs -t 'dynptr/skb_invalid_ctx_f' #84/85 dynptr/skb_invalid_ctx_fentry:OK #84/86 dynptr/skb_invalid_ctx_fexit:OK #84 dynptr:OK #127 kfunc_dynptr_param:OK Summary: 2/2 PASSED, 0 SKIPPED, 0 FAILED Also fix two coding style nits (change spaces to tabs). Signed-off-by: Philo Lu --- .../testing/selftests/bpf/prog_tests/dynptr.c | 36 +++++++++++++++++-- .../testing/selftests/bpf/progs/dynptr_fail.c | 25 +++++++++++++ .../selftests/bpf/progs/dynptr_success.c | 23 ++++++++++++ 3 files changed, 82 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/bpf/prog_tests/dynptr.c b/tools/testing/selftests/bpf/prog_tests/dynptr.c index 7cfac53c0d58d..ba40be8b1c4ef 100644 --- a/tools/testing/selftests/bpf/prog_tests/dynptr.c +++ b/tools/testing/selftests/bpf/prog_tests/dynptr.c @@ -9,6 +9,7 @@ enum test_setup_type { SETUP_SYSCALL_SLEEP, SETUP_SKB_PROG, + SETUP_SKB_PROG_TP, }; static struct { @@ -28,6 +29,7 @@ static struct { {"test_dynptr_clone", SETUP_SKB_PROG}, {"test_dynptr_skb_no_buff", SETUP_SKB_PROG}, {"test_dynptr_skb_strcmp", SETUP_SKB_PROG}, + {"test_dynptr_skb_tp_btf", SETUP_SKB_PROG_TP}, }; static void verify_success(const char *prog_name, enum test_setup_type setup_type) @@ -35,7 +37,7 @@ static void verify_success(const char *prog_name, enum test_setup_type setup_typ struct dynptr_success *skel; struct bpf_program *prog; struct bpf_link *link; - int err; + int err; skel = dynptr_success__open(); if (!ASSERT_OK_PTR(skel, "dynptr_success__open")) @@ -47,7 +49,7 @@ static void verify_success(const char *prog_name, enum test_setup_type setup_typ if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name")) goto cleanup; - bpf_program__set_autoload(prog, true); + bpf_program__set_autoload(prog, true); err = dynptr_success__load(skel); if (!ASSERT_OK(err, "dynptr_success__load")) @@ -87,6 +89,36 @@ static void verify_success(const char *prog_name, enum test_setup_type setup_typ break; } + case SETUP_SKB_PROG_TP: + { + struct __sk_buff skb = {}; + struct bpf_object *obj; + int aux_prog_fd; + + /* Just use its test_run to trigger kfree_skb tracepoint */ + err = bpf_prog_test_load("./test_pkt_access.bpf.o", BPF_PROG_TYPE_SCHED_CLS, + &obj, &aux_prog_fd); + if (!ASSERT_OK(err, "prog_load sched cls")) + goto cleanup; + + LIBBPF_OPTS(bpf_test_run_opts, topts, + .data_in = &pkt_v4, + .data_size_in = sizeof(pkt_v4), + .ctx_in = &skb, + .ctx_size_in = sizeof(skb), + ); + + link = bpf_program__attach(prog); + if (!ASSERT_OK_PTR(link, "bpf_program__attach")) + goto cleanup; + + err = bpf_prog_test_run_opts(aux_prog_fd, &topts); + + if (!ASSERT_OK(err, "test_run")) + goto cleanup; + + break; + } } ASSERT_EQ(skel->bss->err, 0, "err"); diff --git a/tools/testing/selftests/bpf/progs/dynptr_fail.c b/tools/testing/selftests/bpf/progs/dynptr_fail.c index 68b8c6eca5083..8f36c9de75915 100644 --- a/tools/testing/selftests/bpf/progs/dynptr_fail.c +++ b/tools/testing/selftests/bpf/progs/dynptr_fail.c @@ -6,6 +6,7 @@ #include #include #include +#include #include #include "bpf_misc.h" #include "bpf_kfuncs.h" @@ -1254,6 +1255,30 @@ int skb_invalid_ctx(void *ctx) return 0; } +SEC("fentry/skb_tx_error") +__failure __msg("must be referenced or trusted") +int BPF_PROG(skb_invalid_ctx_fentry, void *skb) +{ + struct bpf_dynptr ptr; + + /* this should fail */ + bpf_dynptr_from_skb(skb, 0, &ptr); + + return 0; +} + +SEC("fexit/skb_tx_error") +__failure __msg("must be referenced or trusted") +int BPF_PROG(skb_invalid_ctx_fexit, void *skb) +{ + struct bpf_dynptr ptr; + + /* this should fail */ + bpf_dynptr_from_skb(skb, 0, &ptr); + + return 0; +} + /* Reject writes to dynptr slot for uninit arg */ SEC("?raw_tp") __failure __msg("potential write to dynptr at off=-16") diff --git a/tools/testing/selftests/bpf/progs/dynptr_success.c b/tools/testing/selftests/bpf/progs/dynptr_success.c index 5985920d162e7..bfcc85686cf04 100644 --- a/tools/testing/selftests/bpf/progs/dynptr_success.c +++ b/tools/testing/selftests/bpf/progs/dynptr_success.c @@ -5,6 +5,7 @@ #include #include #include +#include #include "bpf_misc.h" #include "bpf_kfuncs.h" #include "errno.h" @@ -544,3 +545,25 @@ int test_dynptr_skb_strcmp(struct __sk_buff *skb) return 1; } + +SEC("tp_btf/kfree_skb") +int BPF_PROG(test_dynptr_skb_tp_btf, void *skb, void *location) +{ + __u8 write_data[2] = {1, 2}; + struct bpf_dynptr ptr; + int ret; + + if (bpf_dynptr_from_skb(skb, 0, &ptr)) { + err = 1; + return 1; + } + + /* since tp_btf skbs are read only, writes should fail */ + ret = bpf_dynptr_write(&ptr, 0, write_data, sizeof(write_data), 0); + if (ret != -EINVAL) { + err = 2; + return 1; + } + + return 1; +}