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Tue, 04 Feb 2025 17:22:37 -0800 (PST) From: Deepak Gupta Date: Tue, 04 Feb 2025 17:22:10 -0800 Subject: [PATCH v9 23/26] riscv: create a config for shadow stack and landing pad instr support MIME-Version: 1.0 Message-Id: <20250204-v5_user_cfi_series-v9-23-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-Rspamd-Queue-Id: C682A180003 X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: drx3irg1duyjwrd5epasubj5kugjo66t X-HE-Tag: 1738718558-648296 X-HE-Meta: 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 xSxrorpi SDpkmstjigWWLje8iQMKGNiwWHtEnfpRP6vReOy2m/7XAr5ADQXAumPiAg+WxQUUtzCbrHglT234hJAc9sdjdgJS8rN3QsSsARY+csiMRPjWeGDhlxkPMEhaoBFu96XFxQPCu+CtDXPU6WdeV/2jbTWFfwI3tCUBq0CaqP1bYW7PFXqcwiDRIsOYov/aQmYUH2JaPj9dMToBSMuxqm9oKJ0wkSazSRhU9BibXHY6XLnBVgs8jJj8RT9vsrKnOWjz115/6u5g37C/WNf93PFLiRIl7676ooYIYv8BSZnxsmP4RAfQ/6mnOH39toXSgiHHAmGloPi4BSeSrjdogBMI2c010E8sWe2TzJomq8YJwHXVUnpivoMSoMkX0d4PqBsrFUxvhuzwvfvRqhnx3XppypzbdtQnPPgFfJxO/410JTAtTwquOuOC4oRD0Oi81MS2MesdRquofu5z+vZkhN8GvVGFRseAaF7MEKuGHa6yuSXu4CF0= 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. 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