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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id z26-20020aa79f9a000000b0058da92f7c8dsm8566394pfr.17.2023.01.19.17.08.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 19 Jan 2023 17:08:30 -0800 (PST) Date: Thu, 19 Jan 2023 17:08:29 -0800 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 , Weijiang Yang , "Kirill A . Shutemov" , John Allen , kcc@google.com, eranian@google.com, rppt@kernel.org, jamorris@linux.microsoft.com, dethoma@microsoft.com, akpm@linux-foundation.org, Andrew.Cooper3@citrix.com, christina.schimpe@intel.com Subject: Re: [PATCH v5 39/39] x86/shstk: Add ARCH_SHSTK_STATUS Message-ID: <202301191708.9E60F837@keescook> References: <20230119212317.8324-1-rick.p.edgecombe@intel.com> <20230119212317.8324-40-rick.p.edgecombe@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230119212317.8324-40-rick.p.edgecombe@intel.com> X-Rspamd-Queue-Id: B5CFC40009 X-Stat-Signature: yjfzmjwkg6rmio3tauxshze4x9oy8rz9 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1674176911-526950 X-HE-Meta: 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 I7Xg5gdN 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 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, Jan 19, 2023 at 01:23:17PM -0800, Rick Edgecombe wrote: > CRIU and GDB need to get the current shadow stack and WRSS enablement > status. This information is already available via /proc/pid/status, but > this is inconvenient for CRIU because it involves parsing the text output > in an area of the code where this is difficult. Provide a status > arch_prctl(), ARCH_SHSTK_STATUS for retrieving the status. Have arg2 be a > userspace address, and make the new arch_prctl simply copy the features > out to userspace. > > Tested-by: Pengfei Xu > Suggested-by: Mike Rapoport > Signed-off-by: Rick Edgecombe Reviewed-by: Kees Cook -- Kees Cook