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Wed, 15 Oct 2025 11:13:58 -0700 (PDT) From: Deepak Gupta Date: Wed, 15 Oct 2025 11:13:39 -0700 Subject: [PATCH v21 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: <20251015-v5_user_cfi_series-v21-7-6a07856e90e7@rivosinc.com> References: <20251015-v5_user_cfi_series-v21-0-6a07856e90e7@rivosinc.com> In-Reply-To: <20251015-v5_user_cfi_series-v21-0-6a07856e90e7@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-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 4FE751C000A X-Stat-Signature: 8r6gq8hkgt1opt6unay31d7jtzdtdron X-Rspam-User: X-HE-Tag: 1760552040-623325 X-HE-Meta: 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 PxrS2Iju 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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