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Thu, 21 Dec 2023 14:26:45 -0800 (PST) Received: from localhost ([2804:14d:7e39:8470:3fbf:ac2c:7273:55a3]) by smtp.gmail.com with ESMTPSA id ff21-20020a056a002f5500b006cef5c09ca3sm2163914pfb.147.2023.12.21.14.26.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Dec 2023 14:26:45 -0800 (PST) References: User-agent: mu4e 1.10.8; emacs 29.1 To: "Schimpe, Christina" Cc: gdb@sourceware.org Subject: Shadow stack command to host related subcommands (was Re: Shadow stack backtrace command name) In-reply-to: Date: Thu, 21 Dec 2023 19:26:42 -0300 Message-ID: <87h6kbfazh.fsf@linaro.org> MIME-Version: 1.0 Content-Type: text/plain X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gdb@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Thiago Jung Bauermann via Gdb Reply-To: Thiago Jung Bauermann Errors-To: gdb-bounces+public-inbox=simark.ca@sourceware.org Sender: "Gdb" Hello again, This isn't about backtrace, but still related to your proposal I think. "Schimpe, Christina via Gdb" writes: > It is configurable using "print symbol-filename" and COUNT. > The command can be called by the following names: > - "info shadow-stack bt", "info shadow-stack backtrace" > > From my perspective, the command name has the following pros and cons: > (+) Easy to understand by just looking at the command name. > (-) Rather long syntax As I mentioned yesterday, I like the "bt -shadow" proposal but I'd also like to have an "info shadow-stack" command (or just "shadow-stack" as suggested by Guinevere) to hang a couple of GCS subcommands onto, e.g.: info shadow-stack enabled info shadow-stack locked which would get/set the GCS features that are enabled or locked. These correspond to a couple of entries in the structure returned by ptrace's NT_ARM_GCS regset in Linux: struct user_gcs { uint64_t features_enabled; uint64_t features_locked; uint64_t gcspr_el0; }; Initially I thought of exposing them as pseudo-registers, but this way seems more straightforward. What do you think? Would this be useful for Intel CET as well? -- Thiago