From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=209.85.215.176 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794673610; b=xsAnOg4v8fk5kOdHAU4FkJZUh0YjH68mv43wgAxBIqPmxXrXhG4FLWGTPJpfLMiHltfI IKa3k4hHYX6a+sH9k2+/LjU2qv8+/Xv6G24B6QOdBcpQec4XNoXC8rXNKMfq/ajCsyTMO xeKGOScPnehjqFB/B3xx25xc53wJzmuSfxDQwggFWyidLCznaQJkExSOMLkbTXfL4d09u 0crxM7T8jO6ylwl6msiID4rTKq6zMjkovngH9JM9NH3n8/nDrgf+VnwzbPWRJ621U5N5M /JHkg2S2pIUdHnF3q8vQyabV3x1sLS0slqiiIAHbldpT0BLWXYIxTGVjF7bkmRSo27A== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794673610; h=DMARC-Filter:Received:DKIM-Signature:X-Google-DKIM-Signature: X-Forwarded-Encrypted:X-Gm-Message-State:X-Gm-Gg:X-Received:Received: From:To:Cc:Subject:Date:Message-ID:X-Mailer:In-Reply-To:References: MIME-Version:Content-Transfer-Encoding; bh=soJ4jjpDPBCnxqBMue7ymudhbAVotnUPrgSAUa7XWXo=; b=S03D4gNkk49+dWEXaQOrB+wRetkAoEOZhUBKBpw3RJBqrsjfb9ajQmgymPLvrrpPUmXc WcjpTP7DoCW29tbkVuyD6dOmdfafTxoa/OyOP4XKtuJ5hwt8DAYBNZKSmHaRVGL1QCxqH HtLN0zhGCDWNTWkk7lIfWeOGFizvFM5FoF26+o3obNQCODbme7tg6wSvuI381pxwZmbrf mqA+1aMVY+8NJUBwTatg+qCRFTpk2nlWgVbVQdAfkoiATHi2/FQSH9SG0rh/QCfrbn5iD ncAuijHIZKfbECHV9LwYn+Kx5Pm8wgxYl1D9Ujv3kiu397xsdzgHvfX2BTmZdLG+Hlg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20260707 header.b=0PE367vk; arc=none smtp.remote-ip=209.85.215.176 Received: from mail-pg1-f176.google.com (mail-pg1-f176.google.com [209.85.215.176]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 26A31606A8A8 for ; Sat, 14 Nov 2026 16:26:50 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 26A31606A8A8 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20260707 header.b=0PE367vk Received: by mail-pg1-f176.google.com with SMTP id 41be03b00d2f7-cdb2893531bso1764762a12.1 for ; Sat, 14 Nov 2026 08:26:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20260707; t=1794673609; x=1795278409; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=soJ4jjpDPBCnxqBMue7ymudhbAVotnUPrgSAUa7XWXo=; b=0PE367vkhMov64BmEHF86qirTh/Zmd0NSzk3nADN94n23tbjdGS+qcKsgD5PGI3qnx yWS8iMxIyoa7AAlQ/E37sXKWDZ0+MS9yIZjfrfdMjNC0Thf3pkkl97FYGRClRhuBLLzg rXhivnz0kCOlq35pKwouKf2g6hOCQSXTAqM5Y/YWkXGv5wB0VXPgv86XY1C/3vkGX1C3 UayUE200nbgk91Nfnq/GPSxl/SWuSLMWf7Goo0bAmUTk0fUHufyu5eWQF61zNx+lw+uN Ar/i/zGogt3DIeWHK4PF2jWmZNM/Jrz4VMNNfHsc+sOwaN0k9om0F8t0CLzw2J38YpEm ZmQg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1794673609; x=1795278409; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=soJ4jjpDPBCnxqBMue7ymudhbAVotnUPrgSAUa7XWXo=; b=peo+6ARxjtpUBPz01aPeDbXa3jcMP6yfuguD5oxAfTDyFQ+Tp2Z8mZwazpGOvJVySJ 7TGSxeoIpD03wqpsLMAWVMujTrwT82uQUmYsJIK17COsOfWkPove6+pTLqZVh2fo3M6Z 0MGZfzFCtGyH3dSe96V8Zy317k63+o1Llx8nNG++n/8pf1lZdvcwPOg643fP95GWvaio rk9raTHo0dwts7Y02APt9lrDt7el5OvHjyie0h3exH6TDq6aA3kM1xHrX9OUBXQgoWTD peU1jJHtXdT6txolgfdxh2iMkLTF1GT+IiB84y7lwDmh9q5xeJTYk4zUJGWxHIquqOgC W2hQ== X-Forwarded-Encrypted: i=1; AL+hErE3S+2y4IlX6x9+PRkAGQwcryJrNr3Ac59gDbqgXNCKyplFPNwnf+LfL/RPRknSpGROt9LpG7+36DBO/Xo=@vger.kernel.org X-Gm-Message-State: APuU4Z/XCEqTiuNZBMgsNJoZwkE1/Y0q4x7x6xqsZTZqg5Q3r0/f8r38 LaIiSSv47/GYl0WhHcKPlkIJVZo9jPW/ePTAKDIyJvYverrAUvx5SOEf X-Gm-Gg: AYBFou3f+zi/7PEoUJ0sL44YXi88WyPwAJO8Kv8LCugfDx4Z4rbpeW5yNDRYPv916EG 6DmEoD/xlMcDCoofRfc5Tsh87CmFqzpadkAPYMs8u0F7JpUgea+eVRAjJRzVBureUVsKzi4D2sI J6RHzYGShN+KjyNGhbuRFrhoNp4aFgNKW+5Gh/BWG9U5Gt/0gWYXxg+kIM8+vorly8djDQ4L2gj BF99j5WShWMbgPvD7OJZQhd9TGL+2Ja3KfI5rPl02E4T5AAl6X4+JxII/sRkJc96ouSFshXkC/D A4J2wjSphU0ua0IrMQOu3XNyvMmVCbAW6cEY+UFgujKMQWXSG340B985CzzRZC0Ynv4MPaWcv2t SdFXX8tg2L5Db+mxrOuAwSPSRMB16HNriI46J69Du1MEMY0hKUjLnofZLCpEtqsM2eo6M9MUn8i a8as5PHwCopcpy93zpx6qWzxHf8uQ9w6s7qBb0yI1pYJiSpbyGdhzwpFGWoGrYciRRduQAGXWMe ppXQRiBsZ9hQabGaM6W2BknMe2pyhrTZc3i4m1R9e8RlL+AIM2tzZlWXeebSnpVkwumOcGuCudv qVDRXsrawexsF0OUo4U/AUYlXJ+Bj+HXNKPn4ffBxaHSbJ5JVozEaTndmUaBA4UBzB719+segtw cxi6c9+7zMxzOqP0EJ/sA959AESiNrYs1UA0Zy3ppkZHb4XRleTFPHrJr4VfqY/7CJ0m+qshqGK gzetmnwTF0Nzk5T1E8BDGifVyWxIAiIKh8xrWL3dhf X-Received: by 2002:a17:90a:d2cf:b0:3aa:fdad:7d6e with SMTP id 98e67ed59e1d1-3b1b0b669d6mr5757395a91.10.1794673609429; Sat, 14 Nov 2026 08:26:49 -0800 (PST) Received: from sid-dev-env.cgrhrlrrq2nuffriizdlnb1x4b.xx.internal.cloudapp.net ([4.155.54.158]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3b1aec622b6sm10229142a91.11.2026.11.14.08.26.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 14 Nov 2026 08:26:49 -0800 (PST) From: Siddharth Chintamaneni To: Kuniyuki Iwashima , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: Simon Horman , Shuah Khan , Kirill Tkhai , apais@microsoft.com, hargar@linux.microsoft.com, rlmenge@gmail.com, egoriluk@gmail.com, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Siddharth Chintamaneni Subject: [PATCH net v3 2/2] selftest: af_unix: Test scm_fds on dgram disconnect. Date: Sat, 14 Nov 2026 16:26:32 +0000 Message-ID: <20261114162632.16346-3-sidchintamaneni@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261114162632.16346-1-sidchintamaneni@gmail.com> References: <20261114162632.16346-1-sidchintamaneni@gmail.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add dgram_disconnect_fdinfo in scm_rights.c verifying that scm_fds in /proc/self/fdinfo/ returns to 0 when a connected SOCK_DGRAM socket with queued SCM_RIGHTS datagrams disconnects via connect(AF_UNSPEC) or observes a dead peer in send(). Signed-off-by: Siddharth Chintamaneni --- .../selftests/net/af_unix/scm_rights.c | 75 +++++++++++++++++++ 1 file changed, 75 insertions(+) diff --git a/tools/testing/selftests/net/af_unix/scm_rights.c b/tools/testing/selftests/net/af_unix/scm_rights.c index c165f250220a..19aa26c60f3b 100644 --- a/tools/testing/selftests/net/af_unix/scm_rights.c +++ b/tools/testing/selftests/net/af_unix/scm_rights.c @@ -395,4 +395,79 @@ TEST_F(scm_rights, mixed_lowpoint) close_sockets(6); } +static int count_scm_fds(struct __test_metadata *_metadata, int fd) +{ + char path[64], *line = NULL; + int scm_fds = -1, ret; + size_t unused = 0; + FILE *f; + + snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd); + + f = fopen(path, "r"); + ASSERT_NE(NULL, f); + + while (getline(&line, &unused, f) != -1) { + if (strncmp(line, "scm_fds:", 8)) + continue; + + ret = sscanf(line + 8, "%d", &scm_fds); + ASSERT_EQ(1, ret); + + break; + } + + free(line); + + ret = fclose(f); + ASSERT_EQ(0, ret); + + return scm_fds; +} + +TEST(dgram_disconnect_fdinfo) +{ + const FIXTURE_VARIANT(scm_rights) variant = { + .name = "UNIX ", + .type = SOCK_DGRAM, + }; + FIXTURE_DATA(scm_rights) self = {}; + struct sockaddr addr = { + .sa_family = AF_UNSPEC, + }; + int ret; + + ret = unshare(CLONE_NEWNET); + ASSERT_EQ(0, ret); + + create_socketpairs(_metadata, &self, &variant, 2); + + /* 1. Disconnect via connect(AF_UNSPEC) */ + __send_fd(_metadata, &self, &variant, 0, 0); + ASSERT_EQ(2, count_scm_fds(_metadata, self.fd[0])); + + ret = connect(self.fd[0], &addr, sizeof(addr.sa_family)); + ASSERT_EQ(0, ret); + ASSERT_EQ(0, count_scm_fds(_metadata, self.fd[0])); + + /* 2. Dead-peer disconnect via send() */ + __send_fd(_metadata, &self, &variant, 1, 1); + ASSERT_EQ(2, count_scm_fds(_metadata, self.fd[2])); + + ret = close(self.fd[3]); + ASSERT_EQ(0, ret); + + ret = send(self.fd[2], "x", 1, 0); + ASSERT_EQ(-1, ret); + ASSERT_EQ(ECONNREFUSED, errno); + ASSERT_EQ(0, count_scm_fds(_metadata, self.fd[2])); + + ret = close(self.fd[0]); + ASSERT_EQ(0, ret); + ret = close(self.fd[1]); + ASSERT_EQ(0, ret); + ret = close(self.fd[2]); + ASSERT_EQ(0, ret); +} + TEST_HARNESS_MAIN -- 2.43.0