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a=rsa-sha256; c=relaxed/relaxed; d=samsung.com; s=mail20170921; t=1680603122; bh=MG/snmrhqE3ZleiVI4HF15G4FxK/yccdFI4iwAmf/kg=; h=Subject:Reply-To:From:To:CC:In-Reply-To:Date:References:From; b=PBrNDC1jdSG5Z0yFc0dUKtwwu1h5+une4WSmJBEGCfnew06M3jcIPIQ77I4JMop/b 4V7aUMEV1nWVwdwnzdgfQZEq5j6PDbKE7tLNA9vv9N4UH2+HrhaV1Z8vsRwmbLJaN0 0yLkadT25QaxrT084h3EAxF/joI3feEtzb9ARH54= Received: from epsnrtp4.localdomain (unknown [182.195.42.165]) by epcas1p1.samsung.com (KnoxPortal) with ESMTP id 20230404101201epcas1p199b9e0e73099f091309d3d245286d0b4~Ss6KfGWjb1703417034epcas1p1H; Tue, 4 Apr 2023 10:12:01 +0000 (GMT) Received: from epsmges1p2.samsung.com (unknown [182.195.38.243]) by epsnrtp4.localdomain (Postfix) with ESMTP id 4PrNpn4V0Rz4x9Pq; Tue, 4 Apr 2023 10:12:01 +0000 (GMT) X-AuditID: b6c32a36-bfdff70000023112-8e-642bf7f1a854 Received: from epcas1p3.samsung.com ( [182.195.41.47]) by epsmges1p2.samsung.com (Symantec Messaging Gateway) with SMTP id BE.40.12562.1F7FB246; Tue, 4 Apr 2023 19:12:01 +0900 (KST) Mime-Version: 1.0 Subject: RE: [RFC] vsprintf: compile error on %09pK Reply-To: jaewon31.kim@samsung.com From: Jaewon Kim To: David Laight , 'Jaewon Kim' , Petr Mladek CC: Jaewon Kim , "senozhatsky@chromium.org" , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , GyeongHwan Hong X-Priority: 3 X-Content-Kind-Code: NORMAL In-Reply-To: <694722c9409b43808cfbc1fc9e495016@AcuMS.aculab.com> X-Drm-Type: N,general X-Msg-Generator: Mail X-Msg-Type: PERSONAL X-Reply-Demand: N Message-ID: <20230404101201epcms1p615a6365e64fc6e0a0fa203d41404940c@epcms1p6> Date: Tue, 04 Apr 2023 19:12:01 +0900 X-CMS-MailID: 20230404101201epcms1p615a6365e64fc6e0a0fa203d41404940c Content-Transfer-Encoding: 7bit Content-Type: text/plain; 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So I thought I could use %pK for that purpose. And the physical >> address is not that long. I wanted to make that length short like 9 hex. > >Isn't that is the wrong format for physical addresses anyway? >They can be larger than virtual ones (eg x86 with PAE). Yeah, correct. I just used %pK to hide physical address, I thought it could be leak in security perspective. Could you give me advice how I can hide the address by default and look the address if kptr_restrict allow it? Jaewon Kim > > David