From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <owner-linux-mm@kvack.org>
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 A4628C433EF
	for <linux-mm@archiver.kernel.org>; Sun, 20 Mar 2022 21:12:24 +0000 (UTC)
Received: by kanga.kvack.org (Postfix)
	id 30B7B6B0072; Sun, 20 Mar 2022 17:12:24 -0400 (EDT)
Received: by kanga.kvack.org (Postfix, from userid 40)
	id 2BB996B0073; Sun, 20 Mar 2022 17:12:24 -0400 (EDT)
X-Delivered-To: int-list-linux-mm@kvack.org
Received: by kanga.kvack.org (Postfix, from userid 63042)
	id 182376B0074; Sun, 20 Mar 2022 17:12:24 -0400 (EDT)
X-Delivered-To: linux-mm@kvack.org
Received: from relay.hostedemail.com (relay.hostedemail.com [64.99.140.28])
	by kanga.kvack.org (Postfix) with ESMTP id 06CF76B0072
	for <linux-mm@kvack.org>; Sun, 20 Mar 2022 17:12:24 -0400 (EDT)
Received: from smtpin08.hostedemail.com (a10.router.float.18 [10.200.18.1])
	by unirelay11.hostedemail.com (Postfix) with ESMTP id CF1ED80CB3
	for <linux-mm@kvack.org>; Sun, 20 Mar 2022 21:12:23 +0000 (UTC)
X-FDA: 79266012966.08.DDB95E3
Received: from mail-io1-f51.google.com (mail-io1-f51.google.com [209.85.166.51])
	by imf17.hostedemail.com (Postfix) with ESMTP id 710F340007
	for <linux-mm@kvack.org>; Sun, 20 Mar 2022 21:12:23 +0000 (UTC)
Received: by mail-io1-f51.google.com with SMTP id r2so14852493iod.9
        for <linux-mm@kvack.org>; Sun, 20 Mar 2022 14:12:23 -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=Yzq93xtEK5Ypv1Cyb7lhCiwNr/P453Ucxb4rl4WdV38=;
        b=ElcsB4TYJb9n+5lEitobm3ZSjG3fkDFL4FH2b5LtN5EuGK2YoxHWRIyBVXcRbZqTrh
         OQ1EpTA2na4VWdB9XKHqjKsdyCgN6tePkJ6dc7+GxsO7mMmhIVxsCRwKMK+N9NOQ/HNV
         LlS7PghQOViEjUvwusdHtnhkqHXSt0cmZy1CSD+vcurd6bAoHGKk7wf7wRv0Q6+/N7rx
         ewyFg2p6sbedUSmXPqhA7f3W3q8FgrOJzoBzG5jctH9CBGYycpNNOXuUOG5Eu3luxfhf
         CqWoVvlwQe1WFMoawM2J6/gj/1Lv85tVrvFfC/+4TkuStWniZ9LXb5oV3bl3q8XjD1Ji
         ZVIw==
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=Yzq93xtEK5Ypv1Cyb7lhCiwNr/P453Ucxb4rl4WdV38=;
        b=5qQFWU6Aqvm2nLFAaoyfuUE5u2dqIQFZklAW9cGTK0cnA4HrKHNRlb+qPQtnEnWQZ0
         yPsXpl38Fm1YRJy6nv5vVugzCCqRnLd3fBga31wTWki5yL80SGWU7zUL+ppk5c2bYW0a
         ps42ngcEudR4A0+qXU4ezQmzSfyR1QZHLEEaLhj3TTweZv/VAyG+Vh0vChWEIwU7eQ9e
         8rjzghfOjEYmidLquHQDVeIGTNbUwCtN2gEuBopIsrWwlNOYtaTK+qCQWXCHZB3pngFS
         1Lz2cAb4jLCm6P49234ypKVktVPzmj6J049y35iQVqF3cnk/XSY2oonUgSeTEWJkbmsT
         7P4Q==
X-Gm-Message-State: AOAM533EXcj7K68ZZOaZjs2/Zg6a3qQjKNCDOfsPlmEd/bcUlfprRgy9
	2ZKLPpLD+EP/WgMu+d/gDUHDc+oDKMeTMbckUvc=
X-Google-Smtp-Source: ABdhPJxXUF1MDgaHESvndGgNAfueV5hDhUmlQZXL2rsHzov3A69R7SKlyP5c9fE1iCLMyjpZiFZXIz4EviVnVZvBtDo=
X-Received: by 2002:a05:6638:1351:b0:31a:299b:6d87 with SMTP id
 u17-20020a056638135100b0031a299b6d87mr9859261jad.22.1647810742908; Sun, 20
 Mar 2022 14:12:22 -0700 (PDT)
MIME-Version: 1.0
References: <57133fafc4d74377a4a08d98e276d58fe4a127dc.1647115974.git.andreyknvl@google.com>
 <CA+fCnZe-zj8Xqi5ACz0FjRX92b5KnnP=qKCjEck0=mAjV0nohA@mail.gmail.com> <CANpmjNN-UPGOwkYWiOWX5DeSBWnYcobWb+M1ZyWMuSbzJQcFsg@mail.gmail.com>
In-Reply-To: <CANpmjNN-UPGOwkYWiOWX5DeSBWnYcobWb+M1ZyWMuSbzJQcFsg@mail.gmail.com>
From: Andrey Konovalov <andreyknvl@gmail.com>
Date: Sun, 20 Mar 2022 22:12:12 +0100
Message-ID: <CA+fCnZc5Kz5AdttmbzC_Jj8=Q_yNz_iOoa9Jiu7trK8tVm+w4g@mail.gmail.com>
Subject: Re: [PATCH] kasan, scs: collect stack traces from shadow stack
To: Marco Elver <elver@google.com>
Cc: andrey.konovalov@linux.dev, Alexander Potapenko <glider@google.com>, 
	Andrew Morton <akpm@linux-foundation.org>, Dmitry Vyukov <dvyukov@google.com>, 
	Andrey Ryabinin <ryabinin.a.a@gmail.com>, kasan-dev <kasan-dev@googlegroups.com>, 
	Vincenzo Frascino <vincenzo.frascino@arm.com>, Catalin Marinas <catalin.marinas@arm.com>, 
	Will Deacon <will@kernel.org>, Mark Rutland <mark.rutland@arm.com>, 
	Sami Tolvanen <samitolvanen@google.com>, Peter Collingbourne <pcc@google.com>, 
	Evgenii Stepanov <eugenis@google.com>, Linux Memory Management List <linux-mm@kvack.org>, 
	LKML <linux-kernel@vger.kernel.org>, Andrey Konovalov <andreyknvl@google.com>, 
	Florian Mayer <fmayer@google.com>
Content-Type: text/plain; charset="UTF-8"
X-Rspamd-Server: rspam01
X-Rspamd-Queue-Id: 710F340007
X-Stat-Signature: grdkmcmrqrc5cus1z3sucbaseozkwzjn
Authentication-Results: imf17.hostedemail.com;
	dkim=pass header.d=gmail.com header.s=20210112 header.b=ElcsB4TY;
	dmarc=pass (policy=none) header.from=gmail.com;
	spf=pass (imf17.hostedemail.com: domain of andreyknvl@gmail.com designates 209.85.166.51 as permitted sender) smtp.mailfrom=andreyknvl@gmail.com
X-Rspam-User: 
X-HE-Tag: 1647810743-793056
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: <linux-mm.kvack.org>

On Mon, Mar 14, 2022 at 9:57 AM Marco Elver <elver@google.com> wrote:
>
> > Another option here is to instruct stack depot to get the stack from
> > the Shadow Call Stack. This would avoid copying the frames twice.
>
> Yes, I think a stack_depot_save_shadow() would be appropriate if it
> saves a copy.

Sounds good, will do in v2.