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Thu, 6 Jul 2023 13:14:54 +0000 Date: Thu, 6 Jul 2023 14:14:40 +0100 From: "szabolcs.nagy@arm.com" To: Mark Brown , "Edgecombe, Rick P" Cc: "Xu, Pengfei" , "tglx@linutronix.de" , "linux-arch@vger.kernel.org" , "kcc@google.com" , "Lutomirski, Andy" , "nadav.amit@gmail.com" , "david@redhat.com" , "kirill.shutemov@linux.intel.com" , "Schimpe, Christina" , "linux-doc@vger.kernel.org" , "peterz@infradead.org" , "corbet@lwn.net" , "nd@arm.com" , "linux-kernel@vger.kernel.org" , "dethoma@microsoft.com" , "jannh@google.com" , "debug@rivosinc.com" , "mike.kravetz@oracle.com" , "bp@alien8.de" , "rdunlap@infradead.org" , "linux-api@vger.kernel.org" , "john.allen@amd.com" , "jamorris@linux.microsoft.com" , "arnd@arndb.de" , "rppt@kernel.org" , "bsingharora@gmail.com" , "x86@kernel.org" , "pavel@ucw.cz" , "andrew.cooper3@citrix.com" , "oleg@redhat.com" , "keescook@chromium.org" , "gorcunov@gmail.com" , "fweimer@redhat.com" , "Yu, Yu-cheng" , "hpa@zytor.com" , "mingo@redhat.com" , "hjl.tools@gmail.com" , "linux-mm@kvack.org" , "Syromiatnikov, Eugene" , "Torvalds, Linus" , "akpm@linux-foundation.org" , "dave.hansen@linux.intel.com" , "Yang, Weijiang" , "Eranian, Stephane" Subject: Re: [PATCH v9 23/42] Documentation/x86: Add CET shadow stack description Message-ID: References: <2a30ac58-d970-45c3-87d2-55396c0a83f9@sirena.org.uk> <0a9ade13b989ea881fd43fabbe5de1d248cf4218.camel@intel.com> Content-Type: text/plain; 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So which features is glibc > > planning to use? (probably more of a question for Szabolcs). Are push > > and pop controllable separately? > > Push and pop are one control, you get both or neither. > > I'll defer to Szabolcs on glibc plans. gcspopm is always available (esentially *ssp++, this is used for longjmp). i haven't planned anything yet for other modes (i dont know anything where writable shadow stack is better than just turning the feature off, so i expect we at most have a glibc tunable env var to enable it but it will not affect glibc behaviour otherwise).