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Thu, 12 Sep 2024 16:19:03 -0700 (PDT) From: Deepak Gupta To: paul.walmsley@sifive.com, palmer@sifive.com, conor@kernel.org, linux-doc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: corbet@lwn.net, palmer@dabbelt.com, aou@eecs.berkeley.edu, robh@kernel.org, krzk+dt@kernel.org, oleg@redhat.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, peterz@infradead.org, akpm@linux-foundation.org, arnd@arndb.de, ebiederm@xmission.com, kees@kernel.org, Liam.Howlett@oracle.com, vbabka@suse.cz, lorenzo.stoakes@oracle.com, shuah@kernel.org, brauner@kernel.org, samuel.holland@sifive.com, debug@rivosinc.com, andy.chiu@sifive.com, jerry.shih@sifive.com, greentime.hu@sifive.com, charlie@rivosinc.com, evan@rivosinc.com, cleger@rivosinc.com, xiao.w.wang@intel.com, ajones@ventanamicro.com, anup@brainfault.org, mchitale@ventanamicro.com, atishp@rivosinc.com, sameo@rivosinc.com, bjorn@rivosinc.com, alexghiti@rivosinc.com, david@redhat.com, libang.li@antgroup.com, jszhang@kernel.org, leobras@redhat.com, guoren@kernel.org, samitolvanen@google.com, songshuaishuai@tinylab.org, costa.shul@redhat.com, bhe@redhat.com, zong.li@sifive.com, puranjay@kernel.org, namcaov@gmail.com, antonb@tenstorrent.com, sorear@fastmail.com, quic_bjorande@quicinc.com, ancientmodern4@gmail.com, ben.dooks@codethink.co.uk, quic_zhonhan@quicinc.com, cuiyunhui@bytedance.com, yang.lee@linux.alibaba.com, ke.zhao@shingroup.cn, sunilvl@ventanamicro.com, tanzhasanwork@gmail.com, schwab@suse.de, dawei.li@shingroup.cn, rppt@kernel.org, willy@infradead.org, usama.anjum@collabora.com, osalvador@suse.de, ryan.roberts@arm.com, andrii@kernel.org, alx@kernel.org, catalin.marinas@arm.com, broonie@kernel.org, revest@chromium.org, bgray@linux.ibm.com, deller@gmx.de, zev@bewilderbeest.net Subject: [PATCH v4 27/30] riscv: create a config for shadow stack and landing pad instr support Date: Thu, 12 Sep 2024 16:16:46 -0700 Message-ID: <20240912231650.3740732-28-debug@rivosinc.com> X-Mailer: git-send-email 2.45.0 In-Reply-To: <20240912231650.3740732-1-debug@rivosinc.com> References: <20240912231650.3740732-1-debug@rivosinc.com> MIME-Version: 1.0 X-Rspam-User: X-Rspamd-Queue-Id: 6C68C10000B X-Rspamd-Server: rspam01 X-Stat-Signature: 1znf1bau1or18g1b17ty7raj9hdf7zz6 X-HE-Tag: 1726183145-532798 X-HE-Meta: U2FsdGVkX1/RWZGj9WuS+5a2aSrD0ZuHB7Nmy6j9Am8L3UX54f9EwnoQ3jt84pQjYXXDEFCrxsP+cypT+9mh+RaXZE+QwXDClRKyqEysIc2WYAwuS7GLmOXzD3Pc2n84/w9uqAiqsbFXnehzn/mDjTxyPdBdNNmqtW865zUYs29BUqPDn0dJfxIZW87x0g2FHiUjF+nH5fYLUMqumXU84AzwD9Y2IT2KImTCwAtjMkiz/7LEz3iK8mk/KtTxPOJFrd7qFxNjQ9LeAiiqVU8EWnIp++yQoESl32YkMcoSjMkiYsRUAgoEefilsYjWRRwyUX2/flPr5X5HIkGgO/UwW4TzGkt9UgrU59ejPnG+g3LwaLV9iZwn7DBK+8glhX8ZyF2JxU9oTjfmWOdNkM86NSW5w1TW9LSLBwslZk5Lswer0ReOzMG72u0Fd0IK7HuOkYG7H1Qd9tJq3qVL4WO2b5mVYwjXcraDlLE5GyjZbQOJFs4n71YMUQ1IgvQ72Tm9afiOUcsYL1cKb8WGsiu8Yddj2jQSxG9KF2Jk6bgt1jjcQJuG8mjqGBQaDPaAam0FvhksC0iHfdQRyer79xSzIUVSBI6aWZLcMQ70PN2wawBk+U/3S2vFB03rzf4lS5Y1hpGe4m/RhO4JbruCryVd5BkCJdxuFF+KuKd7N2wa2imfNbD+dgpTtNPWe02xaTpALZJn3CcZUTHHRF1PmOnJzQuLw1YU/dlmKFIcHzmc1siYrI+cn5znCgFPLv3yG5avt9ZkTDo3iGPIeS8+ku4hHvrKPVSmfFRFdKRBjdaI4j0nNMskXZMpjC+kdsMUYrdhTaiD/3VpwY1/yJC+k9zsZ91jYzhK+ENmLmrUTkdQMfwDUD9wYPVNyVVP+3xyxgR+7gpUQme3STB5oKCo2s2Q/jSSI3UhsQMZR08sJ7JJ1fg8ZoMyNxKEtkToCEdQUwJTkrZcsIMrQtrMCz1UnP4 vB7rCnLx ILdYalUqQJgcyrV3MjCYvYOKtOXLy9eubCWQujYTfOT7c+pD07Co+ca3yWkiNMuGOaevh6/ZpbQnc6VeGaGr/MmeHP03Imvy/vlU+vtP+2EK8/pHRVcrWY7mX0OpgsWZsVjYE+fyldnAOo+jV7VDOYmzcE1hPERnnU3xKAWPyXIOHRc8pEQg+D9BocHSIxFcuv0Wr5CoBSmQ7FEzPnCu474rkpGKsuax/QaM1h5ZHkXNiDA2h6aP84o1DOaiE0kGNmAL6qGeM9At2ctqG4qboZADw8URzoGQZo1QYBKRxkj0WBMj4QoWySbDh/d40b5TEmz3u6XSOWNJNol6V8YnAFxqDeV0WZWzDFECvYFbNTIZgWfD5QUeEJ+WVZ6tWchqsu19rtiN6eMb9j7jJBmjg6DsrecU8Qx/8bOaMruoJi4ihPNRgnwfIzE6BZ8kycxkp0e8SVdFNlYTdNHt4yfY7bqwUQA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.024304, 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` and `ARCH_HAS_USER_SHADOW_STACK` for riscv. Signed-off-by: Deepak Gupta --- arch/riscv/Kconfig | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index d1d629a3eb91..24bf08c905d2 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -231,6 +231,25 @@ 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 + 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