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Tue, 04 Feb 2025 17:22:07 -0800 (PST) From: Deepak Gupta Date: Tue, 04 Feb 2025 17:21:54 -0800 Subject: [PATCH v9 07/26] riscv mm: manufacture shadow stack pte MIME-Version: 1.0 Message-Id: <20250204-v5_user_cfi_series-v9-7-b37a49c5205c@rivosinc.com> References: <20250204-v5_user_cfi_series-v9-0-b37a49c5205c@rivosinc.com> In-Reply-To: <20250204-v5_user_cfi_series-v9-0-b37a49c5205c@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 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, Deepak Gupta X-Mailer: b4 0.14.0 X-Stat-Signature: tcjcq9mpkf8pgckygmno6emonrexkd9o X-Rspam-User: X-Rspamd-Queue-Id: 80DFD140005 X-Rspamd-Server: rspam03 X-HE-Tag: 1738718528-308365 X-HE-Meta: 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 DZqsfGGm 219XFLO+993yKumhjmhdhfyyGeu+zKlsMCkWFrNTzarwDNeOM3Jke/G/eDY20M/D6N5IVHgQzmkgb07EN9XQ5CUwJmOp2ryxVzzrAOP7l/4fAAG8rsLLJ236mjeG04g8yC938I8GZb0jwKDTDwtnzUs8HdkPCdQv8SMLeY9qdUUtk9pbYJ++3YqEEGXocj3L24fMRTVA8u2UUEjEBNvucCWIjfzi1kmBlzCBLsqL0MbHWgd3BzK1PDjdaegmPPHOygjOitmbXnjvbtPqRjJPjgEMFRxISn4/9JFUkBKmKwjY4p7vUVLCFwYKRcVjlL0b2jS0pulfgsZBhMWDfX0ccWFTmdvikCHbMHIabNyrcKj2ZkDpcLUoiFc8Uk6E3ked0tzs0C7ZXG+/TkOiaOVGe69eOfYwhjGETtSgPSBfUAwdcg2DEgGOpQuThjLYlQd3kjBKtk/bRXfY2dgM= 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. Signed-off-by: Deepak Gupta Reviewed-by: Alexandre Ghiti --- 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 8c528cd7347a..ede43185ffdf 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -421,6 +421,11 @@ 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) @@ -749,6 +754,11 @@ 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)));