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Shutemov" To: Yu-cheng Yu 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 , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Peter Zijlstra , Randy Dunlap , "Ravi V. Shankar" , Vedvyas Shanbhogue , Dave Martin , Weijiang Yang , Pengfei Xu , Haitao Huang , "Kirill A . Shutemov" Subject: Re: [PATCH v24 13/30] mm: Introduce VM_SHADOW_STACK for shadow stack memory Message-ID: <20210409151010.d6r3qazmuw53qnqu@box.shutemov.name> References: <20210401221104.31584-1-yu-cheng.yu@intel.com> <20210401221104.31584-14-yu-cheng.yu@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210401221104.31584-14-yu-cheng.yu@intel.com> X-Rspamd-Queue-Id: 52095C0007E3 X-Stat-Signature: q9gtqja8865mzwfoyepd6671jhmon9b9 X-Rspamd-Server: rspam02 Received-SPF: none (shutemov.name>: No applicable sender policy available) receiver=imf03; identity=mailfrom; envelope-from=""; helo=mail-lf1-f42.google.com; client-ip=209.85.167.42 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1617981010-302355 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, Apr 01, 2021 at 03:10:47PM -0700, Yu-cheng Yu wrote: > A shadow stack PTE must be read-only and have _PAGE_DIRTY set. However, > read-only and Dirty PTEs also exist for copy-on-write (COW) pages. These > two cases are handled differently for page faults. Introduce > VM_SHADOW_STACK to track shadow stack VMAs. > > Signed-off-by: Yu-cheng Yu > Cc: Kees Cook Reviewed-by: Kirill A. Shutemov -- Kirill A. Shutemov