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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id i20-20020a170902e49400b00168dadc7354sm6231569ple.78.2022.12.02.18.53.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 Dec 2022 18:53:00 -0800 (PST) Date: Fri, 2 Dec 2022 18:52:59 -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 v4 32/39] x86: Expose thread features in /proc/$PID/status Message-ID: <202212021852.0EC80A46@keescook> References: <20221203003606.6838-1-rick.p.edgecombe@intel.com> <20221203003606.6838-33-rick.p.edgecombe@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20221203003606.6838-33-rick.p.edgecombe@intel.com> X-Stat-Signature: mby3ib6cqyask8rgibwy5r6bpqqu9fy3 X-Rspam-User: X-Spamd-Result: default: False [6.08 / 9.00]; SORBS_IRL_BL(3.00)[209.85.215.175:from]; SUSPICIOUS_RECIPS(1.50)[]; SUBJECT_HAS_CURRENCY(1.00)[]; MID_RHS_NOT_FQDN(0.50)[]; MIME_GOOD(-0.10)[text/plain]; RCVD_NO_TLS_LAST(0.10)[]; BAD_REP_POLICIES(0.10)[]; BAYES_HAM(-0.02)[48.61%]; R_DKIM_ALLOW(0.00)[chromium.org:s=google]; PREVIOUSLY_DELIVERED(0.00)[linux-mm@kvack.org]; FROM_EQ_ENVFROM(0.00)[]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; RCPT_COUNT_TWELVE(0.00)[38]; TAGGED_RCPT(0.00)[]; DMARC_POLICY_ALLOW(0.00)[chromium.org,none]; TO_MATCH_ENVRCPT_SOME(0.00)[]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(0.00)[+ip4:209.85.128.0/17]; DKIM_TRACE(0.00)[chromium.org:+]; ARC_SIGNED(0.00)[hostedemail.com:s=arc-20220608:i=1]; RCVD_COUNT_THREE(0.00)[3]; FROM_HAS_DN(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[] X-Rspamd-Queue-Id: DBE0E180010 X-Rspamd-Server: rspam06 X-HE-Tag: 1670035981-196196 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Dec 02, 2022 at 04:35:59PM -0800, Rick Edgecombe wrote: > Applications and loaders can have logic to decide whether to enable > shadow stack. They usually don't report whether shadow stack has been > enabled or not, so there is no way to verify whether an application > actually is protected by shadow stack. > > Add two lines in /proc/$PID/status to report enabled and locked features. > > Since, this involves referring to arch specific defines in asm/prctl.h, > implement an arch breakout to emit the feature lines. > > Tested-by: Pengfei Xu > Tested-by: John Allen > Signed-off-by: Kirill A. Shutemov Reviewed-by: Kees Cook -- Kees Cook