From nobody Sat Feb 7 15:09:42 2026 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.9]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C7E5415ECCC; Mon, 25 Mar 2024 06:40:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.9 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711348860; cv=none; b=PFQ1l2KdkmU39PbFjzsEAlelshSWacjh6Cce4TXBYRbli2OgrSbvIKngkmgZxQ2Qlcpwe2uMt7SUvKgWuKogzsy0cVQ1TaDw8WEdOJV4Q5qsrsnomB6bYTezIY30bcOQSfWg/viIl4C8c57vIKoyDyUv4XOKFvPKmjAQqTgXPq0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711348860; c=relaxed/simple; bh=bS1S2X2CJjfZI9Wdu/gKC/PtojbjfoojrJoco+YT8K0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=FONK/Qc9G2oRRUFRsK6T4xFLA0OJjRbzn6Tvha7tgxjWP+GqVXo70yhQxf7VFPsoShkolB+SEmDT4tGOntWGsv7bA0aYZOg3A9HeadTglGO/bTCCw30Ia535SNBV2WXYzH/DvSzxMv0kaPI0i1ssQ4kQNuFhOPONP/5lOyBO0ok= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=iCvUAqM+; arc=none smtp.client-ip=192.198.163.9 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="iCvUAqM+" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1711348858; x=1742884858; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=bS1S2X2CJjfZI9Wdu/gKC/PtojbjfoojrJoco+YT8K0=; b=iCvUAqM+P763FFkqvP9fbv69XTONy7MqqfFgwaGSej2T5t05KuRiZri/ HGqhHtZ+8zYRtnnMf/OEQk7iHFCZWOhPSAlt0yyhH/u5ydovpU+lym2Ct BDZ0LWQXMWylXc2l3AAIUXhqhT1zSzACUpRzgxgNGKBnLDtAHGpIv38CH ZVlHp0T2Oj2N9tmaCWN/eYT9lsayUYIBkf6Zz9y0Lsq17KMp4OK2Y/LIi C+UNSAKpaDaXMTe3VizOlPvo5OTBF006bn9sd0eD8edmcoG9LOl7hi/Hz jzgYhRapenVRCnafneDk38xovJOaJ75Z/P7CtKy7ZejDv4CWQgHemnTMA w==; X-IronPort-AV: E=McAfee;i="6600,9927,11023"; a="17065130" X-IronPort-AV: E=Sophos;i="6.07,152,1708416000"; d="scan'208";a="17065130" Received: from fmviesa002.fm.intel.com ([10.60.135.142]) by fmvoesa103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Mar 2024 23:40:58 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.07,152,1708416000"; d="scan'208";a="38629577" Received: from ahunter6-mobl1.ger.corp.intel.com (HELO ahunter-VirtualBox.home\044ger.corp.intel.com) ([10.251.211.155]) by fmviesa002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Mar 2024 23:40:52 -0700 From: Adrian Hunter To: Thomas Gleixner Cc: Michael Ellerman , Nicholas Piggin , Christophe Leroy , "Aneesh Kumar K.V" , "Naveen N. Rao" , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Andy Lutomirski , Vincenzo Frascino , John Stultz , Stephen Boyd , Peter Zijlstra , Randy Dunlap , Bjorn Helgaas , Arnd Bergmann , Anna-Maria Behnsen , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Subject: [PATCH V2 03/19] vdso: Add CONFIG_GENERIC_VDSO_OVERFLOW_PROTECT Date: Mon, 25 Mar 2024 08:40:07 +0200 Message-Id: <20240325064023.2997-4-adrian.hunter@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240325064023.2997-1-adrian.hunter@intel.com> References: <20240325064023.2997-1-adrian.hunter@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Organization: Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki, Business Identity Code: 0357606 - 4, Domiciled in Helsinki Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add CONFIG_GENERIC_VDSO_OVERFLOW_PROTECT in preparation to add multiplication overflow protection to the VDSO time getter functions. Suggested-by: Thomas Gleixner Signed-off-by: Adrian Hunter --- lib/vdso/Kconfig | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/lib/vdso/Kconfig b/lib/vdso/Kconfig index d883ac299508..c46c2300517c 100644 --- a/lib/vdso/Kconfig +++ b/lib/vdso/Kconfig @@ -30,4 +30,11 @@ config GENERIC_VDSO_TIME_NS Selected by architectures which support time namespaces in the VDSO =20 +config GENERIC_VDSO_OVERFLOW_PROTECT + bool + help + Select to add multiplication overflow protection to the VDSO + time getter functions for the price of an extra conditional + in the hotpath. + endif --=20 2.34.1