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palmer@dabbelt.com, aou@eecs.berkeley.edu, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, oleg@redhat.com, akpm@linux-foundation.org, arnd@arndb.de, ebiederm@xmission.com, Liam.Howlett@oracle.com, vbabka@suse.cz, lstoakes@gmail.com, shuah@kernel.org, brauner@kernel.org, debug@rivosinc.com, andy.chiu@sifive.com, jerry.shih@sifive.com, hankuan.chen@sifive.com, greentime.hu@sifive.com, evan@rivosinc.com, xiao.w.wang@intel.com, charlie@rivosinc.com, apatel@ventanamicro.com, mchitale@ventanamicro.com, dbarboza@ventanamicro.com, sameo@rivosinc.com, shikemeng@huaweicloud.com, willy@infradead.org, vincent.chen@sifive.com, guoren@kernel.org, samitolvanen@google.com, songshuaishuai@tinylab.org, gerg@kernel.org, heiko@sntech.de, bhe@redhat.com, jeeheng.sia@starfivetech.com, cyy@cyyself.name, maskray@google.com, ancientmodern4@gmail.com, mathis.salmen@matsal.de, cuiyunhui@bytedance.com, bgray@linux.ibm.com, mpe@ellerman.id.au, baruch@tkos.co.il, alx@kernel.org, david@redhat.com, catalin.marinas@arm.com, revest@chromium.org, josh@joshtriplett.org, shr@devkernel.io, deller@gmx.de, omosnace@redhat.com, ojeda@kernel.org, jhubbard@nvidia.com Subject: [PATCH v2 07/27] mm: Define VM_SHADOW_STACK for RISC-V Date: Thu, 28 Mar 2024 21:44:39 -0700 Message-Id: <20240329044459.3990638-8-debug@rivosinc.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240329044459.3990638-1-debug@rivosinc.com> References: <20240329044459.3990638-1-debug@rivosinc.com> MIME-Version: 1.0 X-Rspamd-Queue-Id: 92482C0009 X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: 94tq6uqd59wm5d3sybxa8wgnr7rxjcb4 X-HE-Tag: 1711687571-609144 X-HE-Meta: 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same path https://lore.kernel.org/lkml/20231009-arm64-gcs-v6-12-78e55deaa4dd@kernel.org/#r To keep things simple, RISC-V follows the same. Signed-off-by: Deepak Gupta --- include/linux/mm.h | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index f5a97dec5169..225af437ecba 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -352,7 +352,25 @@ extern unsigned int kobjsize(const void *objp); * for more details on the guard size. */ # define VM_SHADOW_STACK VM_HIGH_ARCH_5 -#else +#endif + +#ifdef CONFIG_RISCV_USER_CFI +/* + * On RISC-V pte encodings for shadow stack is R=0, W=1, X=0 and thus RISCV + * choosing to use similar mechanism on vm_flags where VM_WRITE only means + * VM_SHADOW_STACK. RISCV as well doesn't support VM_SHADOW_STACK to be set + * with VM_SHARED. + */ +#define VM_SHADOW_STACK VM_HIGH_ARCH_5 + +static inline bool arch_is_shadow_stack(vm_flags_t vm_flags) +{ + return (vm_flags & VM_SHADOW_STACK); +} + +#endif + +#ifndef VM_SHADOW_STACK # define VM_SHADOW_STACK VM_NONE #endif