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Fri, 11 Jul 2025 12:46:35 -0700 (PDT) From: Deepak Gupta Date: Fri, 11 Jul 2025 12:46:12 -0700 Subject: [PATCH v18 07/27] riscv/mm: manufacture shadow stack pte MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20250711-v5_user_cfi_series-v18-7-a8ee62f9f38e@rivosinc.com> References: <20250711-v5_user_cfi_series-v18-0-a8ee62f9f38e@rivosinc.com> In-Reply-To: <20250711-v5_user_cfi_series-v18-0-a8ee62f9f38e@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: rspam10 X-Rspamd-Queue-Id: 8E46E1C0012 X-Stat-Signature: 3znruix3m6t6yq1m44rn3zjg6pqs1p3p X-Rspam-User: X-HE-Tag: 1752263196-720619 X-HE-Meta: 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 9SyF3VEJ 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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 c0d7e67c67ff..792cb9792e8f 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -431,6 +431,11 @@ 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) @@ -776,6 +781,11 @@ 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