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bh=/wySlLcFxyDfrl0GPIpZt6WlXLvmG1lRYtyeR3mEFyQ=; b=pVrC/7LWu2a92wP58dP2VvZsO5A7IYNizU6tInwVCRzP6TqqmtG25MqwhYJ2QGd+t1ahsG BcA31wWyy9MvtRQCyTysrlytgPj31f9zRxEbchzqLHAwOwc3P2fFXBQTXd9bw+3GrQiCBw PPwMDJaTbXKSMAbxentDI5rmA57VS3o= Date: Fri, 10 Mar 2023 21:26:59 +0100 From: Borislav Petkov To: "Edgecombe, Rick P" Cc: "david@redhat.com" , "bsingharora@gmail.com" , "hpa@zytor.com" , "Syromiatnikov, Eugene" , "peterz@infradead.org" , "rdunlap@infradead.org" , "keescook@chromium.org" , "Eranian, Stephane" , "kirill.shutemov@linux.intel.com" , "dave.hansen@linux.intel.com" , "linux-mm@kvack.org" , "fweimer@redhat.com" , "nadav.amit@gmail.com" , "jannh@google.com" , "dethoma@microsoft.com" , "kcc@google.com" , "linux-arch@vger.kernel.org" , "pavel@ucw.cz" , "oleg@redhat.com" , "hjl.tools@gmail.com" , "akpm@linux-foundation.org" , "Yang, Weijiang" , "Lutomirski, Andy" , "jamorris@linux.microsoft.com" , "arnd@arndb.de" , "tglx@linutronix.de" , "Schimpe, Christina" , "mike.kravetz@oracle.com" , "debug@rivosinc.com" , "linux-doc@vger.kernel.org" , "x86@kernel.org" , "andrew.cooper3@citrix.com" , "john.allen@amd.com" , "rppt@kernel.org" , "mingo@redhat.com" , "corbet@lwn.net" , "linux-kernel@vger.kernel.org" , "linux-api@vger.kernel.org" , "gorcunov@gmail.com" Subject: Re: [PATCH v7 33/41] x86/shstk: Introduce map_shadow_stack syscall Message-ID: <20230310202659.GEZAuSk5bD+PKcaJ/m@fat_crate.local> References: <20230227222957.24501-1-rick.p.edgecombe@intel.com> <20230227222957.24501-34-rick.p.edgecombe@intel.com> <20230310200519.GDZAuNf+bvYjGtazqv@fat_crate.local> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: X-Stat-Signature: zu3e8g3txyrxb5eettnknw8yh7f6dge1 X-Rspam-User: X-Rspamd-Queue-Id: C4A722001C X-Rspamd-Server: rspam06 X-HE-Tag: 1678480025-544804 X-HE-Meta: U2FsdGVkX18ZNb+RqZXdLL7Q+FH8IBEMxASOcy6QIOQuZ1sZcUpFZDvI/qjCgfSw7QiwUY1znpIHmznCcn63uqQKZ3OR8H3QDwB+JIcgNBg+VlMyPpY5LcTBI1247iunzisssxRA7GZiYPtK2P6jPrzu4EnuIpFb0W6AJTB2grbBGwFxTjyVr9A8O3btn2lON+bf1epnJdhw9vWarEmjsljSwBVa4laOleipr4lrNZwu3ckxC5AZ5vXqTyjrAlP6Y5meEQ5AMq1uwosQWiuiGrBf2ytD5Qs70EvEPpP3+NAF+UExuwwSTHMSw9vPUINVimq+s4RwiIfokTtXvC8M8L3im6FP0jLIs7WNemIa1ckf45dH6tU1qwkRsxBDSPrBpzJ2Quv1unIgDHoXzutrMzqaWYUtVyrdCGpbm1h0q1mmlmTyY3nWDSGz3O3sfMIlm1mf7BIrbOYVq50cW9q6LE+qereaRHp1joTllJ1zBWnY1f7te+lFwpldc+WDy30CVUbmrVccOuXZphBINGM+2rDXlS2NOs2hoSnuhzhaa6EJUmunl6pzSKznEKtNM8whGRJFWcji+2a8G5SPyYt0kiYveYWhy6r0yI7oafwr/wdEW2gg9May6ZuC2R7Ni5z36+AbuxZaKrL+K0PeOl5YMXrXoMjyzrZd5HKzsNq7R/XWLWRbhnhnTxWd1l9g9tAkqG6fNaYBSAqU5Df1zBnSvA/U3LD4TYPOVFPPa8XDCvLtLku0BDL/ErPh38o+quUhiJMRQwoPVYCOXB47pHxHDiPaoW7fwM40hc+vnCKhXWu5sNmQuDRdHsLIpYKtnMKPWWPLIcmKw5Jkc257XYeTElQ9R9r62FQdG4z02cTcGXzMmo2E7EOMuGfQsjE9dWY+R4lyLz0muZHEbGn48ztUhlFTyflzrz98rNT1gIMicMAUvz0QcZp3X0rI1KGD8G6IJyBsDwLrI0njPEr30dT C2bEO94t JDvTcniTthEH724aSgkkecTrRSp362odQpFZ6zk5WzoA+3xje2X9mb21A7eiucu4pRLuhLorO2341QhCB0qLEyKqT2iq2HbUTfeZ5N23kbjZq2c5xbtegeQoE+/0B+w/DnZ074rj8pYPSQagn8jD1Y2v6Of+5G5k7i3RWj7ETDRPG3ncDOh34flZYUOAdexxM+MnevJ0TY8j+f9JH+1je7kaYU61C/De950dRubOF1gIW1LfPpV1pHyVi1ghhd9RWOmTEm0qkso79J7Z5VdBCv6TIT9vxvHDgZLo7pg/GL64rjl3TnpRy1h5fSoBFeBI4tbaWWbcXTlzyKQp5Mg/FaB2Eqgtd9n0tTLxBoGUILtXiXSqtKIULgHNtKg== 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, Mar 10, 2023 at 08:19:46PM +0000, Edgecombe, Rick P wrote: > I was thinking ERANGE would be for the 4GB limit. This is the weird 32 > bit limiting thing. So if someone hit it they could look up in the docs > what is going on. The size-big-enough-for-a-token check could be > ENOSPC? Then each reason could have a different error code. Yah, makes perfect sense to me. Thx. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette