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Fri, 02 May 2025 16:31:01 -0700 (PDT) From: Deepak Gupta Date: Fri, 02 May 2025 16:30:38 -0700 Subject: [PATCH v15 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: <20250502-v5_user_cfi_series-v15-7-914966471885@rivosinc.com> References: <20250502-v5_user_cfi_series-v15-0-914966471885@rivosinc.com> In-Reply-To: <20250502-v5_user_cfi_series-v15-0-914966471885@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?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross 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: 9jaz583bgix7a6g879urf8fi3hen3c79 X-Rspamd-Queue-Id: 285D9180007 X-Rspam-User: X-Rspamd-Server: rspam05 X-HE-Tag: 1746228662-915931 X-HE-Meta: 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 5rFXp6LI 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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 dba257cc4e2d..f21c888f59eb 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -433,6 +433,11 @@ 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) @@ -778,6 +783,11 @@ 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