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Mon, 20 Oct 2025 13:22:52 -0700 (PDT) From: Deepak Gupta Date: Mon, 20 Oct 2025 13:22:36 -0700 Subject: [PATCH v22 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: <20251020-v5_user_cfi_series-v22-7-66732256ad8f@rivosinc.com> References: <20251020-v5_user_cfi_series-v22-0-66732256ad8f@rivosinc.com> In-Reply-To: <20251020-v5_user_cfi_series-v22-0-66732256ad8f@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-Rspam-User: X-Rspamd-Queue-Id: 68D072000F X-Rspamd-Server: rspam02 X-Stat-Signature: j8aztefde96tkibyo8t77yug9kmk6got X-HE-Tag: 1760991774-652188 X-HE-Meta: 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 dLr6NpTN hevfAOfta+lA8PqG12ECLIK5HT+vFpAfiJUg7R0KCMd62u8fauPS4imU67Sflj4r7yB04O2M2Sp3d+YNu3bnqFoObXaGc8ZRmXhDw 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))); -- 2.45.0