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Mon, 13 Oct 2025 14:56:14 -0700 (PDT) Received: from debug.ba.rivosinc.com ([64.71.180.162]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-33b626bb49esm13143212a91.12.2025.10.13.14.56.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 13 Oct 2025 14:56:13 -0700 (PDT) From: Deepak Gupta Date: Mon, 13 Oct 2025 14:55:59 -0700 Subject: [PATCH v20 07/28] riscv/mm: manufacture shadow stack pte MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20251013-v5_user_cfi_series-v20-7-b9de4be9912e@rivosinc.com> References: <20251013-v5_user_cfi_series-v20-0-b9de4be9912e@rivosinc.com> In-Reply-To: <20251013-v5_user_cfi_series-v20-0-b9de4be9912e@rivosinc.com> To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Lorenzo Stoakes , Paul Walmsley , Palmer Dabbelt , Albert Ou , Conor Dooley , Rob Herring , Krzysztof Kozlowski , Arnd Bergmann , Christian Brauner , Peter Zijlstra , Oleg Nesterov , Eric Biederman , Kees Cook , Jonathan Corbet , Shuah Khan , Jann Horn , Conor Dooley , Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Andreas Hindborg , Alice Ryhl , Trevor Gross , Benno Lossin Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, alistair.francis@wdc.com, richard.henderson@linaro.org, jim.shu@sifive.com, andybnac@gmail.com, kito.cheng@sifive.com, charlie@rivosinc.com, atishp@rivosinc.com, evan@rivosinc.com, cleger@rivosinc.com, alexghiti@rivosinc.com, samitolvanen@google.com, broonie@kernel.org, rick.p.edgecombe@intel.com, rust-for-linux@vger.kernel.org, Zong Li , Deepak Gupta X-Mailer: b4 0.13.0 X-Stat-Signature: qe58wu11xbcf65fksbbuxayahw3i3xuu X-Rspamd-Queue-Id: 59868100007 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1760392575-298731 X-HE-Meta: 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 hdJSO0UU 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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: This patch implements creating shadow stack pte (on riscv). Creating shadow stack PTE on riscv means that clearing RWX and then setting W=1. Reviewed-by: Alexandre Ghiti Reviewed-by: Zong Li Signed-off-by: Deepak Gupta --- arch/riscv/include/asm/pgtable.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index 4c4057a2550e..e4eb4657e1b6 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -425,6 +425,11 @@ static inline pte_t pte_mkwrite_novma(pte_t pte) return __pte(pte_val(pte) | _PAGE_WRITE); } +static inline pte_t pte_mkwrite_shstk(pte_t pte) +{ + return __pte((pte_val(pte) & ~(_PAGE_LEAF)) | _PAGE_WRITE); +} + /* static inline pte_t pte_mkexec(pte_t pte) */ static inline pte_t pte_mkdirty(pte_t pte) @@ -765,6 +770,11 @@ static inline pmd_t pmd_mkwrite_novma(pmd_t pmd) return pte_pmd(pte_mkwrite_novma(pmd_pte(pmd))); } +static inline pmd_t pmd_mkwrite_shstk(pmd_t pte) +{ + return __pmd((pmd_val(pte) & ~(_PAGE_LEAF)) | _PAGE_WRITE); +} + static inline pmd_t pmd_wrprotect(pmd_t pmd) { return pte_pmd(pte_wrprotect(pmd_pte(pmd))); -- 2.43.0