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[2003:cb:c70a:4d00:b968:9e7a:af8b:adf7]) by smtp.gmail.com with ESMTPSA id bp9-20020a5d5a89000000b0033b4796641asm9321521wrb.22.2024.02.13.02.35.00 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 13 Feb 2024 02:35:03 -0800 (PST) Message-ID: <45d5b98c-bad8-471d-a285-47f47c5b50bb@redhat.com> Date: Tue, 13 Feb 2024 11:34:59 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH v1 09/28] mm: abstract shadow stack vma behind `arch_is_shadow_stack` To: Deepak Gupta Cc: rick.p.edgecombe@intel.com, broonie@kernel.org, Szabolcs.Nagy@arm.com, kito.cheng@sifive.com, keescook@chromium.org, ajones@ventanamicro.com, paul.walmsley@sifive.com, palmer@dabbelt.com, conor.dooley@microchip.com, cleger@rivosinc.com, atishp@atishpatra.org, alex@ghiti.fr, bjorn@rivosinc.com, alexghiti@rivosinc.com, corbet@lwn.net, aou@eecs.berkeley.edu, oleg@redhat.com, akpm@linux-foundation.org, arnd@arndb.de, ebiederm@xmission.com, shuah@kernel.org, brauner@kernel.org, guoren@kernel.org, samitolvanen@google.com, evan@rivosinc.com, xiao.w.wang@intel.com, apatel@ventanamicro.com, mchitale@ventanamicro.com, waylingii@gmail.com, greentime.hu@sifive.com, heiko@sntech.de, jszhang@kernel.org, shikemeng@huaweicloud.com, charlie@rivosinc.com, panqinglin2020@iscas.ac.cn, willy@infradead.org, vincent.chen@sifive.com, andy.chiu@sifive.com, gerg@kernel.org, jeeheng.sia@starfivetech.com, mason.huo@starfivetech.com, ancientmodern4@gmail.com, mathis.salmen@matsal.de, cuiyunhui@bytedance.com, bhe@redhat.com, chenjiahao16@huawei.com, ruscur@russell.cc, bgray@linux.ibm.com, alx@kernel.org, baruch@tkos.co.il, zhangqing@loongson.cn, catalin.marinas@arm.com, revest@chromium.org, josh@joshtriplett.org, joey.gouly@arm.com, shr@devkernel.io, omosnace@redhat.com, ojeda@kernel.org, jhubbard@nvidia.com, linux-doc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-kselftest@vger.kernel.org References: <20240125062739.1339782-1-debug@rivosinc.com> <20240125062739.1339782-10-debug@rivosinc.com> <2f34f6aa-99fa-4545-b706-a1d50864f9e9@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 278C6C001E X-Stat-Signature: 5ujyk3z4pnkcztkjqowsjbqfu5ekxash X-Rspam-User: X-HE-Tag: 1707820508-839029 X-HE-Meta: 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 ArfFWbkn 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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: List-Subscribe: List-Unsubscribe: On 25.01.24 18:07, Deepak Gupta wrote: > On Thu, Jan 25, 2024 at 09:18:07AM +0100, David Hildenbrand wrote: >> On 25.01.24 07:21, debug@rivosinc.com wrote: >>> From: Deepak Gupta >>> >>> x86 has used VM_SHADOW_STACK (alias to VM_HIGH_ARCH_5) to encode shadow >>> stack VMA. VM_SHADOW_STACK is thus not possible on 32bit. Some arches may >>> need a way to encode shadow stack on 32bit and 64bit both and they may >>> encode this information differently in VMAs. >>> >>> This patch changes checks of VM_SHADOW_STACK flag in generic code to call >>> to a function `arch_is_shadow_stack` which will return true if arch >>> supports shadow stack and vma is shadow stack else stub returns false. >>> >>> There was a suggestion to name it as `vma_is_shadow_stack`. I preferred to >>> keep `arch` prefix in there because it's each arch specific. >>> >>> Signed-off-by: Deepak Gupta >>> --- >>> include/linux/mm.h | 18 +++++++++++++++++- >>> mm/gup.c | 5 +++-- >>> mm/internal.h | 2 +- >>> 3 files changed, 21 insertions(+), 4 deletions(-) >>> >>> diff --git a/include/linux/mm.h b/include/linux/mm.h >>> index dfe0e8118669..15c70fc677a3 100644 >>> --- a/include/linux/mm.h >>> +++ b/include/linux/mm.h >>> @@ -352,6 +352,10 @@ extern unsigned int kobjsize(const void *objp); >>> * for more details on the guard size. >>> */ >>> # define VM_SHADOW_STACK VM_HIGH_ARCH_5 >>> +static inline bool arch_is_shadow_stack(vm_flags_t vm_flags) >>> +{ >>> + return (vm_flags & VM_SHADOW_STACK); >>> +} >>> #endif >>> #ifdef CONFIG_RISCV_USER_CFI >>> @@ -362,10 +366,22 @@ extern unsigned int kobjsize(const void *objp); >>> * with VM_SHARED. >>> */ >>> #define VM_SHADOW_STACK VM_WRITE >>> + >>> +static inline bool arch_is_shadow_stack(vm_flags_t vm_flags) >>> +{ >>> + return ((vm_flags & (VM_WRITE | VM_READ | VM_EXEC)) == VM_WRITE); >>> +} >>> + >> >> Please no such hacks just to work around the 32bit vmflags limitation. > > As I said in another response. Noted. > And if there're no takers for 32bit on riscv (which highly likely is the case) > This will go away in next version of patchsets. Sorry for the (unusually for me) late reply. Simplifying to riscv64 sounds great. Alternatively, maybe VM_SHADOW_STACK is not even required at all on riscv if we can teach all code to only stare at arch_is_shadow_stack() instead. ... but, just using the same VM_SHADOW_STACK will it all much cleaner. Eventually, we can just stop playing arch-specific games with arch_is_shadow_stack and VM_SHADOW_STACK. -- Cheers, David / dhildenb