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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id a15-20020a170902b58f00b0017849a2b56asm7513913pls.46.2022.10.03.11.11.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Oct 2022 11:11:46 -0700 (PDT) Date: Mon, 3 Oct 2022 11:11:45 -0700 From: Kees Cook To: Rick Edgecombe Cc: x86@kernel.org, "H . Peter Anvin" , Thomas Gleixner , Ingo Molnar , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, Arnd Bergmann , Andy Lutomirski , Balbir Singh , Borislav Petkov , Cyrill Gorcunov , Dave Hansen , Eugene Syromiatnikov , Florian Weimer , "H . J . Lu" , Jann Horn , Jonathan Corbet , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Peter Zijlstra , Randy Dunlap , "Ravi V . Shankar" , Weijiang Yang , "Kirill A . Shutemov" , joao.moreira@intel.com, John Allen , kcc@google.com, eranian@google.com, rppt@kernel.org, jamorris@linux.microsoft.com, dethoma@microsoft.com, Yu-cheng Yu , Peter Xu Subject: Re: [PATCH v2 13/39] mm: Move VM_UFFD_MINOR_BIT from 37 to 38 Message-ID: <202210031111.01D879A@keescook> References: <20220929222936.14584-1-rick.p.edgecombe@intel.com> <20220929222936.14584-14-rick.p.edgecombe@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220929222936.14584-14-rick.p.edgecombe@intel.com> ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1664820707; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=zRpyaE88IPezVOhw7iDOjlsRbtSXUjPIrXfaa3Vd3zo=; b=DVNH4qFs6qynLusA+KPbmodspmV0zeluCmPbqLEBNPiS5h6cxeSTF1eh0UW2RVYwhoaaXI hLwa9twZ6WOlxDz3iCv9NO3ZF18axOlurDUQqduTXwiknNgULf1zVsxXkq4qeAAwahU6O+ PVG93fQPim/iwzHoNn78T3SrG9IzqrE= ARC-Authentication-Results: i=1; imf04.hostedemail.com; dkim=pass header.d=chromium.org header.s=google header.b=PWArMU3a; spf=pass (imf04.hostedemail.com: domain of keescook@chromium.org designates 209.85.214.170 as permitted sender) smtp.mailfrom=keescook@chromium.org; dmarc=pass (policy=none) header.from=chromium.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1664820707; a=rsa-sha256; cv=none; b=fKg+myv2a3dUZhY32Cqm8OtJOeN0euMP8QUJYRTs3JpgvhYd+Ymn/aqk/+wwxbVpkTZJng xoE91v2GEB1AnCYhIPXHPZQfer+Nsr1e3QGww1pqxOv4JRnMaTfwjmYK0Dv6AyVQrUMEpS vbc+V2EH3T84NmoRQUjrGp3EO+Y+5EQ= X-Stat-Signature: 4os8xbbo31ra85aczcyepb8z1b6ez9hj X-Rspamd-Queue-Id: C2D514001B Authentication-Results: imf04.hostedemail.com; dkim=pass header.d=chromium.org header.s=google header.b=PWArMU3a; spf=pass (imf04.hostedemail.com: domain of keescook@chromium.org designates 209.85.214.170 as permitted sender) smtp.mailfrom=keescook@chromium.org; dmarc=pass (policy=none) header.from=chromium.org X-Rspamd-Server: rspam07 X-Rspam-User: X-HE-Tag: 1664820707-499743 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 Thu, Sep 29, 2022 at 03:29:10PM -0700, Rick Edgecombe wrote: > From: Yu-cheng Yu > > To introduce VM_SHADOW_STACK as VM_HIGH_ARCH_BIT (37), and make all > VM_HIGH_ARCH_BITs stay together, move VM_UFFD_MINOR_BIT from 37 to 38. > > Signed-off-by: Yu-cheng Yu Reviewed-by: Kees Cook -- Kees Cook