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[108.214.96.168]) by smtp.gmail.com with ESMTPSA id 956f58d0204a3-64e65a3bedcsm5250551d50.1.2026.03.16.00.34.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 16 Mar 2026 00:34:21 -0700 (PDT) From: Sun Jian To: bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Cc: andrii@kernel.org, eddyz87@gmail.com, ast@kernel.org, daniel@iogearbox.net, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, shuah@kernel.org, Sun Jian Subject: [PATCH] selftests/bpf: restrict ns_current_pid_tgid updates to target task Date: Mon, 16 Mar 2026 15:34:09 +0800 Message-ID: <20260316073409.4040-1-sun.jian.kdev@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit ns_current_pid_tgid uses a shared syscall tracepoint for current_pid_tgid tracepoint subtests. When selftests run in parallel, unrelated tasks can trigger the same hook and overwrite BSS results, causing false failures. Store the expected pid/tgid in BSS and update user_pid/user_tgid only when bpf_get_ns_current_pid_tgid() returns values matching the target task. This prevents unrelated tasks from interfering with the test, allows dropping the serial-only restriction, and removes the obsolete TODO comment. Tested: ./test_progs -t current_pid_tgid ./test_progs -j$(nproc) -t current_pid_tgid Signed-off-by: Sun Jian --- .../testing/selftests/bpf/prog_tests/ns_current_pid_tgid.c | 5 +++-- .../testing/selftests/bpf/progs/test_ns_current_pid_tgid.c | 7 +++++++ 2 files changed, 10 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/bpf/prog_tests/ns_current_pid_tgid.c b/tools/testing/selftests/bpf/prog_tests/ns_current_pid_tgid.c index 99c953f2be21..e3938bb48151 100644 --- a/tools/testing/selftests/bpf/prog_tests/ns_current_pid_tgid.c +++ b/tools/testing/selftests/bpf/prog_tests/ns_current_pid_tgid.c @@ -34,6 +34,8 @@ static int get_pid_tgid(pid_t *pid, pid_t *tgid, bss->ino = st.st_ino; bss->user_pid = 0; bss->user_tgid = 0; + bss->expected_pid = *pid; + bss->expected_tgid = *tgid; return 0; } @@ -200,8 +202,7 @@ static void test_ns_current_pid_tgid_new_ns(int (*fn)(void *), void *arg) return; } -/* TODO: use a different tracepoint */ -void serial_test_current_pid_tgid(void) +void test_current_pid_tgid(void) { if (test__start_subtest("root_ns_tp")) test_current_pid_tgid_tp(NULL); diff --git a/tools/testing/selftests/bpf/progs/test_ns_current_pid_tgid.c b/tools/testing/selftests/bpf/progs/test_ns_current_pid_tgid.c index 386315afad65..d02c182a7100 100644 --- a/tools/testing/selftests/bpf/progs/test_ns_current_pid_tgid.c +++ b/tools/testing/selftests/bpf/progs/test_ns_current_pid_tgid.c @@ -14,6 +14,8 @@ struct { __u64 user_pid = 0; __u64 user_tgid = 0; +__u64 expected_pid = 0; +__u64 expected_tgid = 0; __u64 dev = 0; __u64 ino = 0; @@ -24,6 +26,11 @@ static void get_pid_tgid(void) if (bpf_get_ns_current_pid_tgid(dev, ino, &nsdata, sizeof(struct bpf_pidns_info))) return; + if (expected_pid && nsdata.pid != expected_pid) + return; + if (expected_tgid && nsdata.tgid != expected_tgid) + return; + user_pid = nsdata.pid; user_tgid = nsdata.tgid; } base-commit: f338e77383789c0cae23ca3d48adcc5e9e137e3c -- 2.43.0