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]) by smtp.lore.kernel.org (Postfix) with ESMTP id C8223C433EF for ; Tue, 29 Mar 2022 18:36:42 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 1E0778D0003; Tue, 29 Mar 2022 14:36:42 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 18C648D0001; Tue, 29 Mar 2022 14:36:42 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 054378D0003; Tue, 29 Mar 2022 14:36:42 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0095.hostedemail.com [216.40.44.95]) by kanga.kvack.org (Postfix) with ESMTP id EA7858D0001 for ; Tue, 29 Mar 2022 14:36:41 -0400 (EDT) Received: from smtpin23.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 9ECDA1828A7FE for ; Tue, 29 Mar 2022 18:36:41 +0000 (UTC) X-FDA: 79298279802.23.CE2B6AD Received: from mail-il1-f174.google.com (mail-il1-f174.google.com [209.85.166.174]) by imf24.hostedemail.com (Postfix) with ESMTP id 30441180009 for ; Tue, 29 Mar 2022 18:36:40 +0000 (UTC) Received: by mail-il1-f174.google.com with SMTP id 14so8307139ily.11 for ; Tue, 29 Mar 2022 11:36:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=5BCw6nbHB1HhY9C/SvU0SfIcx4iHjYcssyIjUbMoR1g=; b=pS1aGCcGSgnivTPCc+Il/56orxKx1GRGqaqXURoaGtCJJizQNsPh4IxTyQcze5fi8+ 56p8uP51n7/s/VVInLARqXwsvRQePbpi67+umg11D/g1Lppxv4xmiaSd38XfckQ+KfWw dK0qfPW8NCjDwSo+OK1e1VpOJVU3PU8nedbZ1FWU0AcqBBtaGsBvM7qbzjlluLVnWAJ+ OrO9e0wnAxF3rWJGEnLkweq0YJNg860Dx8x/czKBdsvJKzfIjtraMEquEpNx1UdcvFCy mOvlJal56W7OqLZspczniHMcUJNevVGK/1EVRQQlV8pfKoBkD/53/gBEuTfL+P0tnMi0 WXMA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=5BCw6nbHB1HhY9C/SvU0SfIcx4iHjYcssyIjUbMoR1g=; b=FyLEmvn/KjF4t+qH8MpRPRI3KRmW9Dat9RgjX9HNP9VxoqTE3SUTcnIqurAOqilb+o 1aorQJzKBcgKuo3p4xvxrwLoYiwKbK+Y9Ljim3fn6FeMfLS6KDSmwy0m+EQeQB/5M6se x+Vzbm080l1sb0uiWFtKzLcpvP2D6NT5KLtw4E2agf/FVthyI3sLoOnsql2vDuZ74OoP NUIn8oqHU8de0HBglc252bPFDcnzSUr1x5a08jNmfMs5UmaPCCImGhD/hvmPXwHakdI3 s0/dls2zpqEOJTW6sV6Ac0ZEvYAVom1uK+En5Ie5M0ME1m1bNlED2o3u1gx1gtDPiXI8 etAA== X-Gm-Message-State: AOAM531ZZE4uBEbgt6txQtO6h+IlJKL8He7nL7q79g8qwfRkZQtT/cVg CHN5Pk4xjmtiU2o06hra0ErY2g0UMkRfCPnCpeI= X-Google-Smtp-Source: ABdhPJzAm+MEvlNtDTnmWisD3LBrjjfAOpYyxgIRIGE0iqWfov1hWQH7t/sgDi7qOlP/TE9Sfe5z60tm9LH77djx/vE= X-Received: by 2002:a05:6e02:1a43:b0:2c9:8e7c:ed98 with SMTP id u3-20020a056e021a4300b002c98e7ced98mr9055749ilv.235.1648579000098; Tue, 29 Mar 2022 11:36:40 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Andrey Konovalov Date: Tue, 29 Mar 2022 20:36:29 +0200 Message-ID: Subject: Re: [PATCH v2 0/4] kasan, arm64, scs, stacktrace: collect stack traces from Shadow Call Stack To: Marco Elver Cc: andrey.konovalov@linux.dev, Alexander Potapenko , Catalin Marinas , Will Deacon , Andrew Morton , Dmitry Vyukov , Andrey Ryabinin , kasan-dev , Mark Rutland , Vincenzo Frascino , Sami Tolvanen , Peter Collingbourne , Evgenii Stepanov , Florian Mayer , Linux Memory Management List , LKML , Andrey Konovalov Content-Type: text/plain; charset="UTF-8" Authentication-Results: imf24.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=pS1aGCcG; spf=pass (imf24.hostedemail.com: domain of andreyknvl@gmail.com designates 209.85.166.174 as permitted sender) smtp.mailfrom=andreyknvl@gmail.com; dmarc=pass (policy=none) header.from=gmail.com X-Stat-Signature: ht66ddkatrp87wsi9j9hrjjypsb84b9m X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 30441180009 X-HE-Tag: 1648579000-771511 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Mar 28, 2022 at 2:36 PM Marco Elver wrote: > > > Changes v1->v2: > > - Provide a kernel-wide stack_trace_save_shadow() interface for collecting > > stack traces from shadow stack. > > - Use ptrauth_strip_insn_pac() and READ_ONCE_NOCHECK, see the comments. > > - Get SCS pointer from x18, as per-task value is meant to save the SCS > > value on CPU switches. > > - Collect stack frames from SDEI and IRQ contexts. > > Do any of these new changes introduce new (noticeable) overhead (in > particular patch 2)? I'll measure the overheads and include the results into v3. Thanks!