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Thu, 24 Apr 2025 00:21:44 -0700 (PDT) From: Deepak Gupta Date: Thu, 24 Apr 2025 00:20:40 -0700 Subject: [PATCH v13 25/28] riscv: create a config for shadow stack and landing pad instr support MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20250424-v5_user_cfi_series-v13-25-971437de586a@rivosinc.com> References: <20250424-v5_user_cfi_series-v13-0-971437de586a@rivosinc.com> In-Reply-To: <20250424-v5_user_cfi_series-v13-0-971437de586a@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-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 11E1540005 X-Stat-Signature: szeorrxhwf3pjy5n9qgkm6may3c9zndu X-Rspam-User: X-HE-Tag: 1745479305-272777 X-HE-Meta: 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 LaXuC2L3 HTZFIdJskdj6UAwGbSZJZ0X6vrq8i262LGE2i3se/uThKQp2DAJmjaUA5tuNHQBHR+1PpnOYcvYxVBFK+PP/YL1WS4T9Lt15HYJW5qzF/V8lDeqk= 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 creates a config for shadow stack support and landing pad instr support. Shadow stack support and landing instr support can be enabled by selecting `CONFIG_RISCV_USER_CFI`. Selecting `CONFIG_RISCV_USER_CFI` wires up path to enumerate CPU support and if cpu support exists, kernel will support cpu assisted user mode cfi. If CONFIG_RISCV_USER_CFI is selected, select `ARCH_USES_HIGH_VMA_FLAGS`, `ARCH_HAS_USER_SHADOW_STACK` and DYNAMIC_SIGFRAME for riscv. Reviewed-by: Zong Li Signed-off-by: Deepak Gupta --- arch/riscv/Kconfig | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 7612c52e9b1e..0a2e50f056e8 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -250,6 +250,26 @@ config ARCH_HAS_BROKEN_DWARF5 # https://github.com/llvm/llvm-project/commit/7ffabb61a5569444b5ac9322e22e5471cc5e4a77 depends on LD_IS_LLD && LLD_VERSION < 180000 +config RISCV_USER_CFI + def_bool y + bool "riscv userspace control flow integrity" + depends on 64BIT && $(cc-option,-mabi=lp64 -march=rv64ima_zicfiss) + depends on RISCV_ALTERNATIVE + select ARCH_HAS_USER_SHADOW_STACK + select ARCH_USES_HIGH_VMA_FLAGS + select DYNAMIC_SIGFRAME + help + Provides CPU assisted control flow integrity to userspace tasks. + Control flow integrity is provided by implementing shadow stack for + backward edge and indirect branch tracking for forward edge in program. + Shadow stack protection is a hardware feature that detects function + return address corruption. This helps mitigate ROP attacks. + Indirect branch tracking enforces that all indirect branches must land + on a landing pad instruction else CPU will fault. This mitigates against + JOP / COP attacks. Applications must be enabled to use it, and old user- + space does not get protection "for free". + default y + config ARCH_MMAP_RND_BITS_MIN default 18 if 64BIT default 8 -- 2.43.0