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Wed, 22 Oct 2025 16:29:52 -0700 (PDT) From: Deepak Gupta Date: Wed, 22 Oct 2025 16:29:33 -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: <20251022-v5_user_cfi_series-v22-7-fdaa7e4022aa@rivosinc.com> References: <20251022-v5_user_cfi_series-v22-0-fdaa7e4022aa@rivosinc.com> In-Reply-To: <20251022-v5_user_cfi_series-v22-0-fdaa7e4022aa@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: 0FDBC1C0009 X-Rspamd-Server: rspam02 X-Stat-Signature: 5jsyopzfknq56to1dkckrtya9nbg813t X-HE-Tag: 1761175793-628954 X-HE-Meta: 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 d2L9W2Xo 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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