From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-yw1-f176.google.com (mail-yw1-f176.google.com [209.85.128.176]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 72EE74CA79E for ; Mon, 5 Oct 2026 15:10:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.176 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791213005; cv=none; b=UNsCfRCfo5sRTVwBqgYQwmJFFs5vQ/Wie+sxpPulW7876ETrei54KWIPfsg1uPdmOspqNyQBiyLRtX6+bG/zJx4RPWTYSYxNrsMPLkQsZYrDuKCy0mDusDq70JWdPl2kY728XUGbv1nkiZy4rQ3/K5f7631ni3HcmhPdkZYT4jE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791213005; c=relaxed/simple; bh=sj6IvvpiH4G5HeXtQ/w8rgZEYm6Vebo2GQ/VGeptjoQ=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=ioCNLj27J4FS3CjCxeiGUQhfvm2/36YgOIKnxqCH4AiNMVK8e1icy2KTU3bDFT8UDjMyUvT1vjU346qkhp9R20BwyXNOj9r7C1ownjyaSbfh1DyobbOfKGJcnibqbsLJtiY/4wJ4KmcVkNYWIme4WybNf/xqHRIcN8QtzfGwEuI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=amutable.com; spf=pass smtp.mailfrom=amutable.com; dkim=pass (2048-bit key) header.d=amutable-com.20251104.gappssmtp.com header.i=@amutable-com.20251104.gappssmtp.com header.b=00kxn9kE; arc=none smtp.client-ip=209.85.128.176 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=amutable.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=amutable.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=amutable-com.20251104.gappssmtp.com header.i=@amutable-com.20251104.gappssmtp.com header.b="00kxn9kE" Received: by mail-yw1-f176.google.com with SMTP id 00721157ae682-8abd68b3937so16924337b3.2 for ; Mon, 05 Oct 2026 08:10:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amutable-com.20251104.gappssmtp.com; s=20251104; t=1791212999; x=1791817799; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :content-type:mime-version:subject:date:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=OiZ06e1bwcFWfpqrqmzoNBYBcxZ/+ZVmZd6FQIzN/qM=; b=00kxn9kE3vGTHtl3bKE8JrlY8b1mc/tt6MK3NzlWUmXSjEwgMtwbmTrv8kmJf3fzEb U7wuDL1ptAf6j3Ea+P/peJnhnXRzK/IbPIFNVvRJEd/7PlEg/A5C1rddBp3t6UCIUKtu X5BFR5C8lkP2VjvAg38calf5QJD70Cb2/0mDa9xyhgRfB38NZRqbKjXVQG7ViVE+Vr8l 62psLmdkXu1b8miz5uNvIBGibmsi+ul6v5uU6nQAwGXU5xjCLLFiWAheUkYCp/ti1wCv zBqd8opwdrJuDrvOUODIPx4zc+R6+VhM0qj0MV2seu/Q+wAVXyZwfYDIcTtUzcBjx+zm KGTQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1791212999; x=1791817799; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :content-type:mime-version:subject:date:from:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=OiZ06e1bwcFWfpqrqmzoNBYBcxZ/+ZVmZd6FQIzN/qM=; b=hGGjLrh25kUhUKGFkK+9sNx90+qLsqd7TfovzwxoBLgoBj8GzDZnMfjMJQ6T+kSFk2 Q+GHZwsXU/ZStKKboUuUWWTQt12J2UHm3KSRBTD+qAuwSmqW/TvmvAXQhz7CjKnnv0s5 gQYiDsv8oQtgGlqAZF9GmFDqKyp0VQByfOizQzcZqdXc6dXkWreSOpxBT0qa9SaonzIm 48y9VV0fxeIo8agK8/cGoivl/SOjZ7YcA/e1d5BP+LIx2Mz+A2gU3+FjEXvDBzBp4n0h clkM4Wb92izTs9FXrZKPw4Icd9+H5IF2SjhE2fEcwfblPh1qdCvTJBCAHbG3eoandbEM AV1Q== X-Forwarded-Encrypted: i=1; AKwUvBynSeFDkTBRh5hFRN3onUhO3lbQlxxYQznVeroiA0h4kgWCeRPKYVoP7kPbFjY7QDBWwYGhpsk=@vger.kernel.org X-Gm-Message-State: AFq9FYJk9iHNTTLucYHLydu+8cVeK/Qo9CnHUuQlvJDCUNSQ5kfnit2A IBnn/w41+sx5yLUTmzaGYDP0UnZCJjva9c0S+BF1bf5dMNZTdcMkt8kJIkbuj8axey98 X-Gm-Gg: AYBFou1dw0R+kluI7WFPNUWZh/V9HC0p+mze4nEgf9IEr8pDBedgKkI/3aX6P+09XK0 MHoPrtmGsGF0I2EgCdUmnQsW2HaSgfmtQ92fMzbQMA6+waLKUc0MEDVfI7NSbw//SueHjPa5it2 tq+H63CD8WsdeD1/OyFs5l++uFA90vTN3J2mZNOhnOIupqiAWHMa75FxEjeisAisN2nn+httoQQ tec15s5ABVvnDSyFSqJhZiQtcq8ymyN1TjgFZ5Z97GdVsGasup6o5g5espiBOdR2x8PXojz25Iv ucvKudL/Q8/iC+34iPccORiKFxoJviR+8OdFAQK3qDNrt5BD4pdfHn17fwZiNQXw+mevqn1UNkz PbuJJQMfN8JyJvMB49jkalWugDr5b+uFHYiIFcMwjBWpYnzBlpykHcogq9Q4xQp2+6ororZbO9N Vb+5inpBkUr28Axq2HtwMRB+PnDTRQqXsk/WKwTrhzIJJyKOi8L524MTzp0LFf5Y/78h/4VftNU xr4spMl/T928uW3s9aG7ZQuysJh7/zRAjGtsmBwq752Y2cTdQNkpWaq X-Received: by 2002:a05:690c:4d49:b0:8ac:46ff:d3a5 with SMTP id 00721157ae682-8ae959d6dc1mr29681427b3.64.1791212998716; Mon, 05 Oct 2026 08:09:58 -0700 (PDT) Received: from [192.168.1.110] (104-53-165-62.lightspeed.stlsmo.sbcglobal.net. [104.53.165.62]) by smtp.gmail.com with ESMTPSA id 00721157ae682-8ae33fe81fdsm41210467b3.47.2026.10.05.08.09.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 05 Oct 2026 08:09:58 -0700 (PDT) From: Andrew Halaney Date: Mon, 05 Oct 2026 10:09:38 -0500 Subject: [PATCH v4 08/10] selftests/net: SO_PEERPIDFD_THREAD Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261005-work-unix-passpidfd-v4-8-350183b6e02a@amutable.com> References: <20261005-work-unix-passpidfd-v4-0-350183b6e02a@amutable.com> In-Reply-To: <20261005-work-unix-passpidfd-v4-0-350183b6e02a@amutable.com> To: Jakub Kicinski , Kuniyuki Iwashima , Oleg Nesterov Cc: "David S. Miller" , Paolo Abeni , Simon Horman , Willem de Bruijn , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Alexander Viro , Jan Kara , linux-fsdevel@vger.kernel.org, Alexander Mikhalitsyn , "Christian Brauner (Amutable)" , Andrew Halaney , Eric Dumazet , Alexander Mikhalitsyn X-Mailer: b4 0.14.3 From: Christian Brauner Add tests for SO_PEERPIDFD_THREAD. Signed-off-by: Christian Brauner (Amutable) Reviewed-by: Alexander Mikhalitsyn Signed-off-by: Andrew Halaney --- tools/testing/selftests/net/af_unix/scm_pidfd.c | 97 +++++++++++++++++++++++++ 1 file changed, 97 insertions(+) diff --git a/tools/testing/selftests/net/af_unix/scm_pidfd.c b/tools/testing/selftests/net/af_unix/scm_pidfd.c index d73ae9d27a48..cbe53fab44fc 100644 --- a/tools/testing/selftests/net/af_unix/scm_pidfd.c +++ b/tools/testing/selftests/net/af_unix/scm_pidfd.c @@ -36,6 +36,10 @@ #define SO_PASSPIDFD_THREAD 86 #endif +#ifndef SO_PEERPIDFD_THREAD +#define SO_PEERPIDFD_THREAD 87 +#endif + #define CHILD_EXIT_CODE_OK 123 static void child_die() @@ -1058,4 +1062,97 @@ TEST(scm_pidfd_thread_creds) EXPECT_EQ(msg.ids.pid, msg.thread_info.tgid); } +static void *peer_connect_thread(void *arg) +{ + struct sock_addr *sa = arg; + struct thread_ids ids = { + .pid = getpid(), + .tid = gettid(), + }; + int fd; + char sync; + + fd = socket(AF_UNIX, SOCK_STREAM, 0); + if (fd < 0) + return (void *)1; + + if (connect(fd, (struct sockaddr *)&sa->listen_addr, sa->addrlen)) + return (void *)1; + + if (send(fd, &ids, sizeof(ids), 0) != sizeof(ids)) + return (void *)1; + + /* stay alive until the server has looked at our pidfd */ + if (read(fd, &sync, 1) != 1) + return (void *)1; + + close(fd); + return NULL; +} + +static int peer_pidfd_info(int fd, int optname, struct pidfd_info *info) +{ + int pidfd; + socklen_t len = sizeof(pidfd); + + if (getsockopt(fd, SOL_SOCKET, optname, &pidfd, &len)) { + log_err("getsockopt(SO_PEERPIDFD*)"); + return -1; + } + + info->mask = PIDFD_INFO_PID; + if (ioctl(pidfd, PIDFD_GET_INFO, info)) { + log_err("ioctl(PIDFD_GET_INFO)"); + close(pidfd); + return -1; + } + + close(pidfd); + return 0; +} + +/* SO_PEERPIDFD_THREAD returns a pidfd for the peer's connecting thread. */ +TEST(so_peerpidfd_thread) +{ + struct sock_addr sa; + struct thread_ids ids; + struct pidfd_info info; + pthread_t thread; + void *tret; + int server, cfd; + + server = socket(AF_UNIX, SOCK_STREAM, 0); + ASSERT_LE(0, server); + + fill_sockaddr(&sa, true); + ASSERT_EQ(0, bind(server, (struct sockaddr *)&sa.listen_addr, sa.addrlen)); + ASSERT_EQ(0, listen(server, 1)); + + ASSERT_EQ(0, pthread_create(&thread, NULL, peer_connect_thread, &sa)); + + cfd = accept(server, NULL, NULL); + ASSERT_LE(0, cfd); + + ASSERT_EQ(sizeof(ids), recv(cfd, &ids, sizeof(ids), MSG_WAITALL)); + ASSERT_NE(ids.pid, ids.tid); + + /* SO_PEERPIDFD refers to the peer's thread-group. */ + ASSERT_EQ(0, peer_pidfd_info(cfd, SO_PEERPIDFD, &info)); + EXPECT_EQ(ids.pid, info.pid); + EXPECT_EQ(ids.pid, info.tgid); + + /* SO_PEERPIDFD_THREAD refers to the connecting thread. */ + ASSERT_EQ(0, peer_pidfd_info(cfd, SO_PEERPIDFD_THREAD, &info)); + EXPECT_EQ(ids.tid, info.pid); + EXPECT_EQ(ids.pid, info.tgid); + + /* release the connecting thread */ + ASSERT_EQ(1, write(cfd, "x", 1)); + ASSERT_EQ(0, pthread_join(thread, &tret)); + ASSERT_EQ(NULL, tret); + + close(cfd); + close(server); +} + TEST_HARNESS_MAIN -- 2.55.0