From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id F1981109C056 for ; Wed, 25 Mar 2026 18:20:36 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id EE19D6B008A; Wed, 25 Mar 2026 14:20:34 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id DF5256B008C; Wed, 25 Mar 2026 14:20:34 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CBBED6B0092; Wed, 25 Mar 2026 14:20:34 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id BBD1D6B008A for ; Wed, 25 Mar 2026 14:20:34 -0400 (EDT) Received: from smtpin13.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 820A6E0F16 for ; Wed, 25 Mar 2026 18:20:34 +0000 (UTC) X-FDA: 84585400788.13.B388CF1 Received: from mail-qk1-f181.google.com (mail-qk1-f181.google.com [209.85.222.181]) by imf14.hostedemail.com (Postfix) with ESMTP id A4D4D10000B for ; Wed, 25 Mar 2026 18:20:32 +0000 (UTC) Authentication-Results: imf14.hostedemail.com; dkim=pass header.d=soleen.com header.s=google header.b=AsPymY1z; dmarc=pass (policy=reject) header.from=soleen.com; spf=pass (imf14.hostedemail.com: domain of pasha.tatashin@soleen.com designates 209.85.222.181 as permitted sender) smtp.mailfrom=pasha.tatashin@soleen.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1774462832; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:mime-version:mime-version:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=PHul+QGmCaYYH+cSj7r6hzl0Za0NZYfxsHk+JlDRO+k=; b=wbfUmHZZgocgLUlFgO0DtBpOaR5ursLG5Qdg87m3O5WJCH6GuogB9epyU1QWbzFjwSw4JB 5+XLiDkOHVhvdxYjEm7fH59elmfuNlhZC1qkAWdMjoBAC928/CA2Yryn6PVcRMTx3LFfJS 43lXZJnVPbqOnirrutKXxBVUT1Wqx8E= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1774462832; a=rsa-sha256; cv=none; b=qVJnquEGwn2iDdp3lmGBqm6kxYTyhbO+h6BUnce6S0LeffBX2hfitKv353tKyCAlZiMX3p x0wuEZkNjWoosYSLDNpjQq+Ht8HQIyusko0xrhfPDbxuwVJ8PbVhm+tmz7wpZV5pI4QuiY 6n7AjHB2z8RhZR6Qh5BV6aW7gY67usk= ARC-Authentication-Results: i=1; imf14.hostedemail.com; dkim=pass header.d=soleen.com header.s=google header.b=AsPymY1z; dmarc=pass (policy=reject) header.from=soleen.com; spf=pass (imf14.hostedemail.com: domain of pasha.tatashin@soleen.com designates 209.85.222.181 as permitted sender) smtp.mailfrom=pasha.tatashin@soleen.com Received: by mail-qk1-f181.google.com with SMTP id af79cd13be357-8cfbbdbaf3cso8281985a.0 for ; Wed, 25 Mar 2026 11:20:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=soleen.com; s=google; t=1774462832; x=1775067632; darn=kvack.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=PHul+QGmCaYYH+cSj7r6hzl0Za0NZYfxsHk+JlDRO+k=; b=AsPymY1zFTGMfDB1njbDT4dTr/GYl8qeQDcaaLkjzKppQed5/dTu51cGKDQ7d+WiHg J3vaWtSEv1H+7/73Vp4YiS5Qu7m/IRXMIdQtd9XPrgUsc+Be2rLqoujnO21QX6qSgUGC 52s1vpcPJUn25Th4lFmHSZRoeUPrs5fszIW6CgKEUAuLCGnupMZsjfBuosTE5MqWTn8Y fTU6EiEuQCCRc5A2EolkLcE5UPQBFB6chwa1I2dFQ0Y4L5nyCFX8eqTmMva743qsTMc4 5LIj7TWWqx/WpAf1I6Pi5yF0rE6BuRoFJygyBokfsALEhhz5vxA0M+kSkciU6MwNe/5h BAZg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1774462832; x=1775067632; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-gg:x-gm-message-state:from:to :cc:subject:date:message-id:reply-to; bh=PHul+QGmCaYYH+cSj7r6hzl0Za0NZYfxsHk+JlDRO+k=; b=KT1uZ7r31d87eZJpi7s774GZeaC6BXQO1UlKlVyxQn572B4wPA00CP3BL8zR4L01Kg qxlfhIH1d9rR4mSNqp3BGEGh4Omf1EH7nGF6byQwxpXu0Lt2GlhOaoZwJwz1CKw4y8vg AXn+OlAd6cw6UQpD7GpuOe9nNnS4Sex1Lakt8gSNMBom23DPgKCjnSk+iX3QQpAxdHE/ x+gEtBAWqMU1kP6I6snTk51yOWJ/7+yypURFrGUvySXMTLQPbqsY/ooSa7dRNNTFdNTA OiPzl8+Bnw1tkec5H6blSD1huRb8AAtReGL4hqi4N9UpvZFHcLvI0TIbKAnfgBu11QtI UR2w== X-Forwarded-Encrypted: i=1; AJvYcCWBRfA8EI0Ig/8a87yCr2CV4KMq+i/xLjv1uK67yfW+3D16zx5Os4h7BIqDC5/Q5O5Mh3mUhzyFNQ==@kvack.org X-Gm-Message-State: AOJu0Yyszf51J5Xz/+tijff3U4SWA6cUL8TXppoTubXT1K/UnTzV1GR6 JcwadIds0MW9r+Zjw8HC12cQCe/fR7Agn48B9g1tvPhCuEsR8jlnnSnfkZQ4xk+jydw= X-Gm-Gg: ATEYQzyNVB5SMNx1q7SBxlT8z49wgSIh15OhPmMwyTcRhSkoD3FslU9QS1J5ip7qTWk EAcvhIUqU0k/FblBlMSCAkZrFoKKbOUrJXPfmyoWAKP/VvYsbaqvHOlwNXYOenmZgRwIlslVQ+h DWMViFHXQDk/SGwLyaXv9rM6Zw7FosKeEYg9w9Ba01Cg/RlJQX0xvdqZa7cMzJi4MWKOd2/c2+o 50P/CiH50gE61FHyv2YkXMksQlHmVh544LvfEnRho4wpDw6OOB5CkcUuLq84M9fK3G0ojBUS+ll brZHeD2bSKXGm9C8l6TmJAcNm0SvyI1klrImgY60cdNfP3DPlzZBRjU1vKThQDDiW8pDt/+5JOT y01MuzzsLs1MVIFixygN2oVelHTwG47pOjmKg81iAtlHpAZX1akHSX7tWd4zNwTi8uPhUMwQsJe lYRkBpxIeRQSJbnS33punfkKN4XobOQRWww97WzdPgxGanCEqtFuaWI1VKqQYKocyRMvGikgwOt JN4 X-Received: by 2002:a05:620a:488d:b0:8cf:cc59:c0a0 with SMTP id af79cd13be357-8d0005ab522mr599385885a.27.1774462831645; Wed, 25 Mar 2026 11:20:31 -0700 (PDT) Received: from plex.localdomain ([71.181.43.54]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8d00e250556sm64225385a.0.2026.03.25.11.20.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Mar 2026 11:20:31 -0700 (PDT) From: Pasha Tatashin To: linux-kselftest@vger.kernel.org, rppt@kernel.org, shuah@kernel.org, akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, pasha.tatashin@soleen.com, dmatlack@google.com, pratyush@kernel.org, skhawaja@google.com Subject: [PATCH v3 2/2] selftests: liveupdate: add test for double preservation Date: Wed, 25 Mar 2026 18:20:26 +0000 Message-ID: <20260325182026.467307-3-pasha.tatashin@soleen.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260325182026.467307-1-pasha.tatashin@soleen.com> References: <20260325182026.467307-1-pasha.tatashin@soleen.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: A4D4D10000B X-Stat-Signature: 1u57377sy9eewzahzogey6ickqigstm4 X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1774462832-672399 X-HE-Meta: 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 w1p09buA cavRNJXvQ+oGK9GLgiZFCkwHOclyXvIrSgm1NXPfHdoAyJuC4EqV/M4sLuSemBu4VE320aSrqqpVliWoQNP3ESlwquJsHetPOnUN7TGbvmaTVkztRmB+5ThjZZUKKa6q+6NKCVO/sfJzUWdqGHGu3DKgYrC0lcgJGdDvbWp/OygnDVLs6LrXcdIyENsWtC6Q0xRfyAswtgbmMbzNLrguflW2QGJGoXkZG+0BLwxAg0CeIDesBZsqmSrhrX21UsF2IcBTcdCQhFWOgKe8NJjY5ym2XK7R6mKfk9vdKLV97FOH+BYNU8avSgHB6O/BO5oTeDz1o+3BtR0ayzbjknRDQ5C13ZEf6Y9080tTMH5j2RPfgzo88ItRZPM+FgQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Verify that a file can only be preserved once across all active sessions. Attempting to preserve it a second time, whether in the same or a different session, should fail with EBUSY. Reviewed-by: Mike Rapoport (Microsoft) Reviewed-by: Samiullah Khawaja Signed-off-by: Pasha Tatashin --- .../testing/selftests/liveupdate/liveupdate.c | 41 +++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/tools/testing/selftests/liveupdate/liveupdate.c b/tools/testing/selftests/liveupdate/liveupdate.c index c2878e3d5ef9..37c808fbe1e9 100644 --- a/tools/testing/selftests/liveupdate/liveupdate.c +++ b/tools/testing/selftests/liveupdate/liveupdate.c @@ -345,4 +345,45 @@ TEST_F(liveupdate_device, preserve_unsupported_fd) ASSERT_EQ(close(session_fd), 0); } +/* + * Test Case: Prevent Double Preservation + * + * Verifies that a file (memfd) can only be preserved once across all active + * sessions. Attempting to preserve it a second time, whether in the same or + * a different session, should fail with EBUSY. + */ +TEST_F(liveupdate_device, prevent_double_preservation) +{ + int session_fd1, session_fd2, mem_fd; + int ret; + + self->fd1 = open(LIVEUPDATE_DEV, O_RDWR); + if (self->fd1 < 0 && errno == ENOENT) + SKIP(return, "%s does not exist", LIVEUPDATE_DEV); + ASSERT_GE(self->fd1, 0); + + session_fd1 = create_session(self->fd1, "double-preserve-session-1"); + ASSERT_GE(session_fd1, 0); + session_fd2 = create_session(self->fd1, "double-preserve-session-2"); + ASSERT_GE(session_fd2, 0); + + mem_fd = memfd_create("test-memfd", 0); + ASSERT_GE(mem_fd, 0); + + /* First preservation should succeed */ + ASSERT_EQ(preserve_fd(session_fd1, mem_fd, 0x1111), 0); + + /* Second preservation in a different session should fail with EBUSY */ + ret = preserve_fd(session_fd2, mem_fd, 0x2222); + EXPECT_EQ(ret, -EBUSY); + + /* Second preservation in the same session (different token) should fail with EBUSY */ + ret = preserve_fd(session_fd1, mem_fd, 0x3333); + EXPECT_EQ(ret, -EBUSY); + + ASSERT_EQ(close(mem_fd), 0); + ASSERT_EQ(close(session_fd1), 0); + ASSERT_EQ(close(session_fd2), 0); +} + TEST_HARNESS_MAIN -- 2.43.0