From nobody Thu Apr 2 22:00:52 2026 Received: from mail-qt1-f181.google.com (mail-qt1-f181.google.com [209.85.160.181]) (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 658AC406281 for ; Thu, 26 Mar 2026 16:39:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.181 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774543191; cv=none; b=FBzF6W9HadE4rd9NK3gJDS5Amqs3CiJfS+70NkzjZNyoCyTluxG0NjaBOL7GZBMtKqyCztrLx/wUmfKNMA1q6qLBvUs9rPlIR4xP8HsJONzswhddpLMvzkJzTcJmFKZ2pgllkTPIg/EVnwwEcZlMsV3GZrhRh7XJGnv6dKOgNew= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774543191; c=relaxed/simple; bh=GBazXh/uUV+veTugAXj7FLLeItvlURuuxUNZwTmoUrY=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=dPNfNTmQmXPcjmAHPx5tZWslOo6a8y5czhyXbJ81VoqmOZo8/hLR8p8OZW694X8sHUTim6+fdiazip288Gx0/HLehcNbWo93OcEcVXX+6/crH4+mzNK5H7m+/ghn2RYupfSlHM0qu/9zD/KFAgdeIF+mfoovjYJeOMYEhK9CqLo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=soleen.com; spf=pass smtp.mailfrom=soleen.com; dkim=pass (2048-bit key) header.d=soleen.com header.i=@soleen.com header.b=Ds8KrWBO; arc=none smtp.client-ip=209.85.160.181 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=soleen.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=soleen.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=soleen.com header.i=@soleen.com header.b="Ds8KrWBO" Received: by mail-qt1-f181.google.com with SMTP id d75a77b69052e-50b29c4e554so14988881cf.0 for ; Thu, 26 Mar 2026 09:39:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=soleen.com; s=google; t=1774543188; x=1775147988; darn=vger.kernel.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=Ds8KrWBOU9GXh5edQu2VDbmKEgosBYsKe79AxCi2LjUaRSKXQi4gn0D/Q3u8AcmN76 tcYB5FOpvfCHdyOXaDzLihUFY0WtyVf3inqKMmbXL694fuOdtDi0XnpSzbBqwJBxs7z4 v1RNieDVLtk5rXOH3MqrAHT/Dtxb/OCrCEOXQEaZK95MF/qolTN/yeRsPv6GX2HG3xtj lv7Ti895wvUkXixdYs+kFpmH+UNHq/cNbTT5i0tTL42LslpsWJ00TCxw1pqbyex9bdp8 Y9e2yDHkEhLM6b/D0Ehi3II5YOU/HBAtACdQiLICheNtKYYb3QeatqibVn3L6FpNmp3X /zUA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1774543188; x=1775147988; 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=X4ZGd4T1kRgbBojv5z7tN/J9bwTRceASxAjI0UHHw0UuPi4y0HzUWrdhuTF18X4OFQ OuA3qN+0ur5tQQa/lbSEHc+d8kIJI6gocu8iOjCowJjS8KEXADRoswstGSr92ACI8Y77 jT/YY5pdCrF+myNLKeyOHo2V9731XcnOo4r8GZONGlsaHWRjiyc6BUEngzr/tGwILWfF 8PfFFlBbblWmXR8y1bEmRjrzFjnDj1xb2Vs92IvhbgZZJugeKHFFxa94RDpbHMW4ligk Z5jts02QUTZa5p+Nwtnm3bgmX2lUCcne9/QZhACcg6tb4vG+D0ZpxuIMMAVIyxli2Tjz ITJg== X-Forwarded-Encrypted: i=1; AJvYcCU2eJKOTdCNdGb7TzD5p++Sshq828gDyg820NingFykrhY3yq4dZu8/HvD475Up1U+HL1INkJjv0KNEyTY=@vger.kernel.org X-Gm-Message-State: AOJu0YxmmfhEtRCUfxJv7HH4Y30Cqb+GSCYx7b4tywwg4nKBTyvA4Bha bnbjbBOGJbJJcHRKDcuOSDRtgeb9/LHHU/CGCV0Em8Sr52kI7H4SbnBhg7k345tpn3I= X-Gm-Gg: ATEYQzy+ale53sLaszCslDkIrro9nftFjcKBc4kJikD0pmXEeh6az5PXXxkxTkDLHJr WlGYA2y8TaZorlIO9ole4dj7m8tYl14cZAuP5XW7fUEEPFJgIVfSmsjjyrZBEDAkhx1zDgT5HlX lerzcJzOrpeZHYPdA/8Fa+P9sQ5y2FISykDAsp7PVHNrit2q6wp06B1HDjnieA8+iRCSF9IA4vE 0eZ5NkIWZT3a2g8M514n1MmWkyRRLGghiYXkXaWRJu8G//pQQUHBVeZesxKiYH2SJCFqGvb5aHz BEozUYseazbC5bRuVi+57QriWIvwcfv8gNWLlDrFtJ+Wovm37I5CUEWYUYoYbOLllKjxl3TCHue JwsrFONnNx1jL5LkqV9e4X7UpmUGXzzZxuvana+Hm4O1Fu3NlpLRgk5LZoEtyNge6NPfKRl6CTP HjCAuwV7XBOVrtGk6pTrLUp899ELPvwnzKwBF7TVxpF4suS7ziV5aDeqFIRdAu/abZQA== X-Received: by 2002:a05:622a:251a:b0:508:faa5:4512 with SMTP id d75a77b69052e-50b80e5418dmr113877081cf.50.1774543188330; Thu, 26 Mar 2026 09:39:48 -0700 (PDT) Received: from plex.localdomain ([71.181.43.54]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-50b920f77cfsm28238251cf.6.2026.03.26.09.39.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Mar 2026 09:39:47 -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 v4 3/3] selftests: liveupdate: add test for double preservation Date: Thu, 26 Mar 2026 16:39:43 +0000 Message-ID: <20260326163943.574070-4-pasha.tatashin@soleen.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260326163943.574070-1-pasha.tatashin@soleen.com> References: <20260326163943.574070-1-pasha.tatashin@soleen.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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/testin= g/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); } =20 +/* + * Test Case: Prevent Double Preservation + * + * Verifies that a file (memfd) can only be preserved once across all acti= ve + * 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 =3D open(LIVEUPDATE_DEV, O_RDWR); + if (self->fd1 < 0 && errno =3D=3D ENOENT) + SKIP(return, "%s does not exist", LIVEUPDATE_DEV); + ASSERT_GE(self->fd1, 0); + + session_fd1 =3D create_session(self->fd1, "double-preserve-session-1"); + ASSERT_GE(session_fd1, 0); + session_fd2 =3D create_session(self->fd1, "double-preserve-session-2"); + ASSERT_GE(session_fd2, 0); + + mem_fd =3D 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 =3D preserve_fd(session_fd2, mem_fd, 0x2222); + EXPECT_EQ(ret, -EBUSY); + + /* Second preservation in the same session (different token) should fail = with EBUSY */ + ret =3D 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 --=20 2.43.0