From: Deepak Gupta <debug@rivosinc.com> To: paul.walmsley@sifive.com, rick.p.edgecombe@intel.com, broonie@kernel.org, Szabolcs.Nagy@arm.com, kito.cheng@sifive.com, keescook@chromium.org, ajones@ventanamicro.com, conor.dooley@microchip.com, cleger@rivosinc.com, atishp@atishpatra.org, alex@ghiti.fr, bjorn@rivosinc.com, alexghiti@rivosinc.com, samuel.holland@sifive.com, conor@kernel.org Cc: linux-doc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-kselftest@vger.kernel.org, corbet@lwn.net, 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, Mike Rapoport <rppt@kernel.org> Subject: [PATCH v3 09/29] mm: abstract shadow stack vma behind `vma_is_shadow_stack` Date: Wed, 3 Apr 2024 16:34:57 -0700 [thread overview] Message-ID: <20240403234054.2020347-10-debug@rivosinc.com> (raw) In-Reply-To: <20240403234054.2020347-1-debug@rivosinc.com> VM_SHADOW_STACK (alias to VM_HIGH_ARCH_5) to encode shadow stack VMA. This patch changes checks of VM_SHADOW_STACK flag in generic code to call to a function `vma_is_shadow_stack` which will return true if its a shadow stack vma and default stub (when support doesnt exist) returns false. Signed-off-by: Deepak Gupta <debug@rivosinc.com> Suggested-by: Mike Rapoport <rppt@kernel.org> --- include/linux/mm.h | 13 ++++++++++++- mm/gup.c | 5 +++-- mm/internal.h | 2 +- 3 files changed, 16 insertions(+), 4 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 64109f6c70f5..9952937be659 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -363,8 +363,19 @@ extern unsigned int kobjsize(const void *objp); #ifndef VM_SHADOW_STACK # define VM_SHADOW_STACK VM_NONE + +static inline bool vma_is_shadow_stack(vm_flags_t vm_flags) +{ + return false; +} +#else +static inline bool vma_is_shadow_stack(vm_flags_t vm_flags) +{ + return (vm_flags & VM_SHADOW_STACK); +} #endif + #if defined(CONFIG_X86) # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */ #elif defined(CONFIG_PPC) @@ -3473,7 +3484,7 @@ static inline unsigned long stack_guard_start_gap(struct vm_area_struct *vma) return stack_guard_gap; /* See reasoning around the VM_SHADOW_STACK definition */ - if (vma->vm_flags & VM_SHADOW_STACK) + if (vma->vm_flags && vma_is_shadow_stack(vma->vm_flags)) return PAGE_SIZE; return 0; diff --git a/mm/gup.c b/mm/gup.c index df83182ec72d..a7a02eb0a6b3 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -1053,7 +1053,7 @@ static int check_vma_flags(struct vm_area_struct *vma, unsigned long gup_flags) !writable_file_mapping_allowed(vma, gup_flags)) return -EFAULT; - if (!(vm_flags & VM_WRITE) || (vm_flags & VM_SHADOW_STACK)) { + if (!(vm_flags & VM_WRITE) || vma_is_shadow_stack(vm_flags)) { if (!(gup_flags & FOLL_FORCE)) return -EFAULT; /* hugetlb does not support FOLL_FORCE|FOLL_WRITE. */ @@ -1071,7 +1071,8 @@ static int check_vma_flags(struct vm_area_struct *vma, unsigned long gup_flags) if (!is_cow_mapping(vm_flags)) return -EFAULT; } - } else if (!(vm_flags & VM_READ)) { + } else if (!(vm_flags & VM_READ) && !vma_is_shadow_stack(vm_flags)) { + /* reads allowed if its shadow stack vma */ if (!(gup_flags & FOLL_FORCE)) return -EFAULT; /* diff --git a/mm/internal.h b/mm/internal.h index f309a010d50f..5035b5a58df0 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -572,7 +572,7 @@ static inline bool is_exec_mapping(vm_flags_t flags) */ static inline bool is_stack_mapping(vm_flags_t flags) { - return ((flags & VM_STACK) == VM_STACK) || (flags & VM_SHADOW_STACK); + return ((flags & VM_STACK) == VM_STACK) || vma_is_shadow_stack(flags); } /* -- 2.43.2
WARNING: multiple messages have this Message-ID (diff)
From: Deepak Gupta <debug@rivosinc.com> To: paul.walmsley@sifive.com, rick.p.edgecombe@intel.com, broonie@kernel.org, Szabolcs.Nagy@arm.com, kito.cheng@sifive.com, keescook@chromium.org, ajones@ventanamicro.com, conor.dooley@microchip.com, cleger@rivosinc.com, atishp@atishpatra.org, alex@ghiti.fr, bjorn@rivosinc.com, alexghiti@rivosinc.com, samuel.holland@sifive.com, conor@kernel.org Cc: linux-doc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-kselftest@vger.kernel.org, corbet@lwn.net, 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, Mike Rapoport <rppt@kernel.org> Subject: [PATCH v3 09/29] mm: abstract shadow stack vma behind `vma_is_shadow_stack` Date: Wed, 3 Apr 2024 16:34:57 -0700 [thread overview] Message-ID: <20240403234054.2020347-10-debug@rivosinc.com> (raw) In-Reply-To: <20240403234054.2020347-1-debug@rivosinc.com> VM_SHADOW_STACK (alias to VM_HIGH_ARCH_5) to encode shadow stack VMA. This patch changes checks of VM_SHADOW_STACK flag in generic code to call to a function `vma_is_shadow_stack` which will return true if its a shadow stack vma and default stub (when support doesnt exist) returns false. Signed-off-by: Deepak Gupta <debug@rivosinc.com> Suggested-by: Mike Rapoport <rppt@kernel.org> --- include/linux/mm.h | 13 ++++++++++++- mm/gup.c | 5 +++-- mm/internal.h | 2 +- 3 files changed, 16 insertions(+), 4 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 64109f6c70f5..9952937be659 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -363,8 +363,19 @@ extern unsigned int kobjsize(const void *objp); #ifndef VM_SHADOW_STACK # define VM_SHADOW_STACK VM_NONE + +static inline bool vma_is_shadow_stack(vm_flags_t vm_flags) +{ + return false; +} +#else +static inline bool vma_is_shadow_stack(vm_flags_t vm_flags) +{ + return (vm_flags & VM_SHADOW_STACK); +} #endif + #if defined(CONFIG_X86) # define VM_PAT VM_ARCH_1 /* PAT reserves whole VMA at once (x86) */ #elif defined(CONFIG_PPC) @@ -3473,7 +3484,7 @@ static inline unsigned long stack_guard_start_gap(struct vm_area_struct *vma) return stack_guard_gap; /* See reasoning around the VM_SHADOW_STACK definition */ - if (vma->vm_flags & VM_SHADOW_STACK) + if (vma->vm_flags && vma_is_shadow_stack(vma->vm_flags)) return PAGE_SIZE; return 0; diff --git a/mm/gup.c b/mm/gup.c index df83182ec72d..a7a02eb0a6b3 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -1053,7 +1053,7 @@ static int check_vma_flags(struct vm_area_struct *vma, unsigned long gup_flags) !writable_file_mapping_allowed(vma, gup_flags)) return -EFAULT; - if (!(vm_flags & VM_WRITE) || (vm_flags & VM_SHADOW_STACK)) { + if (!(vm_flags & VM_WRITE) || vma_is_shadow_stack(vm_flags)) { if (!(gup_flags & FOLL_FORCE)) return -EFAULT; /* hugetlb does not support FOLL_FORCE|FOLL_WRITE. */ @@ -1071,7 +1071,8 @@ static int check_vma_flags(struct vm_area_struct *vma, unsigned long gup_flags) if (!is_cow_mapping(vm_flags)) return -EFAULT; } - } else if (!(vm_flags & VM_READ)) { + } else if (!(vm_flags & VM_READ) && !vma_is_shadow_stack(vm_flags)) { + /* reads allowed if its shadow stack vma */ if (!(gup_flags & FOLL_FORCE)) return -EFAULT; /* diff --git a/mm/internal.h b/mm/internal.h index f309a010d50f..5035b5a58df0 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -572,7 +572,7 @@ static inline bool is_exec_mapping(vm_flags_t flags) */ static inline bool is_stack_mapping(vm_flags_t flags) { - return ((flags & VM_STACK) == VM_STACK) || (flags & VM_SHADOW_STACK); + return ((flags & VM_STACK) == VM_STACK) || vma_is_shadow_stack(flags); } /* -- 2.43.2 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv
next prev parent reply other threads:[~2024-04-03 23:41 UTC|newest] Thread overview: 156+ messages / expand[flat|nested] mbox.gz Atom feed top 2024-04-03 23:34 [PATCH v3 00/29] riscv control-flow integrity for usermode Deepak Gupta 2024-04-03 23:34 ` Deepak Gupta 2024-04-03 23:34 ` [PATCH v3 01/29] riscv: envcfg save and restore on task switching Deepak Gupta 2024-04-03 23:34 ` Deepak Gupta 2024-05-09 0:10 ` Charlie Jenkins 2024-05-09 0:10 ` Charlie Jenkins 2024-05-09 19:00 ` Deepak Gupta 2024-05-09 19:00 ` Deepak Gupta 2024-04-03 23:34 ` [PATCH v3 02/29] riscv: define default value for envcfg for task Deepak Gupta 2024-04-03 23:34 ` Deepak Gupta 2024-05-10 22:33 ` Charlie Jenkins 2024-05-10 22:33 ` Charlie Jenkins 2024-05-13 18:33 ` Deepak Gupta 2024-05-13 18:33 ` Deepak Gupta 2024-04-03 23:34 ` [PATCH v3 03/29] riscv/Kconfig: enable HAVE_EXIT_THREAD for riscv Deepak Gupta 2024-04-03 23:34 ` Deepak Gupta 2024-05-10 22:36 ` Charlie Jenkins 2024-05-10 22:36 ` Charlie Jenkins 2024-04-03 23:34 ` [PATCH v3 04/29] riscv: zicfilp / zicfiss in dt-bindings (extensions.yaml) Deepak Gupta 2024-04-03 23:34 ` Deepak Gupta 2024-04-10 11:58 ` Rob Herring 2024-04-10 11:58 ` Rob Herring 2024-04-10 21:37 ` Deepak Gupta 2024-04-10 21:37 ` Deepak Gupta 2024-04-15 19:41 ` Rob Herring 2024-04-15 19:41 ` Rob Herring 2024-04-16 15:44 ` Deepak Gupta 2024-04-16 15:44 ` Deepak Gupta 2024-05-09 18:14 ` Conor Dooley 2024-05-09 18:14 ` Conor Dooley 2024-05-09 18:46 ` Deepak Gupta 2024-05-09 18:46 ` Deepak Gupta 2024-05-09 20:32 ` Conor Dooley 2024-05-09 20:32 ` Conor Dooley 2024-05-09 23:26 ` Deepak Gupta 2024-05-09 23:26 ` Deepak Gupta 2024-04-03 23:34 ` [PATCH v3 05/29] riscv: zicfiss / zicfilp enumeration Deepak Gupta 2024-04-03 23:34 ` Deepak Gupta 2024-05-09 0:00 ` Andy Chiu 2024-05-09 0:00 ` Andy Chiu 2024-05-09 0:07 ` Charlie Jenkins 2024-05-09 0:07 ` Charlie Jenkins 2024-04-03 23:34 ` [PATCH v3 06/29] riscv: zicfiss / zicfilp extension csr and bit definitions Deepak Gupta 2024-04-03 23:34 ` Deepak Gupta 2024-05-10 22:37 ` Charlie Jenkins 2024-05-10 22:37 ` Charlie Jenkins 2024-04-03 23:34 ` [PATCH v3 07/29] riscv: usercfi state for task and save/restore of CSR_SSP on trap entry/exit Deepak Gupta 2024-04-03 23:34 ` Deepak Gupta 2024-05-10 22:51 ` Charlie Jenkins 2024-05-10 22:51 ` Charlie Jenkins 2024-04-03 23:34 ` [PATCH v3 08/29] mm: Define VM_SHADOW_STACK for RISC-V Deepak Gupta 2024-04-03 23:34 ` Deepak Gupta 2024-04-04 18:58 ` David Hildenbrand 2024-04-04 18:58 ` David Hildenbrand 2024-04-04 19:04 ` Mark Brown 2024-04-04 19:04 ` Mark Brown 2024-04-04 19:15 ` David Hildenbrand 2024-04-04 19:15 ` David Hildenbrand 2024-04-04 19:21 ` Deepak Gupta 2024-04-04 19:21 ` Deepak Gupta 2024-04-03 23:34 ` Deepak Gupta [this message] 2024-04-03 23:34 ` [PATCH v3 09/29] mm: abstract shadow stack vma behind `vma_is_shadow_stack` Deepak Gupta 2024-04-04 19:02 ` David Hildenbrand 2024-04-04 19:02 ` David Hildenbrand 2024-04-04 21:39 ` Deepak Gupta 2024-04-04 21:39 ` Deepak Gupta 2024-04-03 23:34 ` [PATCH v3 10/29] riscv/mm : ensure PROT_WRITE leads to VM_READ | VM_WRITE Deepak Gupta 2024-04-03 23:34 ` Deepak Gupta 2024-05-10 21:02 ` Charlie Jenkins 2024-05-10 21:02 ` Charlie Jenkins 2024-05-13 17:47 ` Deepak Gupta 2024-05-13 17:47 ` Deepak Gupta 2024-05-13 18:36 ` Charlie Jenkins 2024-05-13 18:36 ` Charlie Jenkins 2024-05-13 18:41 ` Deepak Gupta 2024-05-13 18:41 ` Deepak Gupta 2024-05-13 21:26 ` Charlie Jenkins 2024-05-13 21:26 ` Charlie Jenkins 2024-05-12 16:24 ` Alexandre Ghiti 2024-05-12 16:24 ` Alexandre Ghiti 2024-05-13 18:29 ` Deepak Gupta 2024-05-13 18:29 ` Deepak Gupta 2024-04-03 23:34 ` [PATCH v3 11/29] riscv mm: manufacture shadow stack pte Deepak Gupta 2024-04-03 23:34 ` Deepak Gupta 2024-05-12 16:26 ` Alexandre Ghiti 2024-05-12 16:26 ` Alexandre Ghiti 2024-04-03 23:35 ` [PATCH v3 12/29] riscv mmu: teach pte_mkwrite to manufacture shadow stack PTEs Deepak Gupta 2024-04-03 23:35 ` Deepak Gupta 2024-05-12 16:28 ` Alexandre Ghiti 2024-05-12 16:28 ` Alexandre Ghiti 2024-05-13 17:33 ` Deepak Gupta 2024-05-13 17:33 ` Deepak Gupta 2024-04-03 23:35 ` [PATCH v3 13/29] riscv mmu: write protect and shadow stack Deepak Gupta 2024-04-03 23:35 ` Deepak Gupta 2024-05-12 16:31 ` Alexandre Ghiti 2024-05-12 16:31 ` Alexandre Ghiti 2024-05-13 17:32 ` Deepak Gupta 2024-05-13 17:32 ` Deepak Gupta 2024-04-03 23:35 ` [PATCH v3 14/29] riscv/mm: Implement map_shadow_stack() syscall Deepak Gupta 2024-04-03 23:35 ` Deepak Gupta 2024-05-12 16:50 ` Alexandre Ghiti 2024-05-12 16:50 ` Alexandre Ghiti 2024-05-13 17:25 ` Deepak Gupta 2024-05-13 17:25 ` Deepak Gupta 2024-04-03 23:35 ` [PATCH v3 15/29] riscv/shstk: If needed allocate a new shadow stack on clone Deepak Gupta 2024-04-03 23:35 ` Deepak Gupta 2024-05-12 17:05 ` Alexandre Ghiti 2024-05-12 17:05 ` Alexandre Ghiti 2024-05-13 17:10 ` Deepak Gupta 2024-05-13 17:10 ` Deepak Gupta 2024-04-03 23:35 ` [PATCH v3 16/29] prctl: arch-agnostic prctl for shadow stack Deepak Gupta 2024-04-03 23:35 ` Deepak Gupta 2024-04-03 23:35 ` [PATCH v3 17/29] prctl: arch-agnostic prctl for indirect branch tracking Deepak Gupta 2024-04-03 23:35 ` Deepak Gupta 2024-05-10 23:29 ` Charlie Jenkins 2024-05-10 23:29 ` Charlie Jenkins 2024-05-13 18:31 ` Deepak Gupta 2024-05-13 18:31 ` Deepak Gupta 2024-04-03 23:35 ` [PATCH v3 18/29] riscv: Implements arch agnostic shadow stack prctls Deepak Gupta 2024-04-03 23:35 ` Deepak Gupta 2024-04-03 23:35 ` [PATCH v3 19/29] riscv: Implements arch agnostic indirect branch tracking prctls Deepak Gupta 2024-04-03 23:35 ` Deepak Gupta 2024-04-03 23:35 ` [PATCH v3 20/29] riscv/kernel: update __show_regs to print shadow stack register Deepak Gupta 2024-04-03 23:35 ` Deepak Gupta 2024-05-12 17:10 ` Alexandre Ghiti 2024-05-12 17:10 ` Alexandre Ghiti 2024-04-03 23:35 ` [PATCH v3 21/29] riscv/traps: Introduce software check exception Deepak Gupta 2024-04-03 23:35 ` Deepak Gupta 2024-04-03 23:35 ` [PATCH v3 22/29] riscv sigcontext: adding cfi state field in sigcontext Deepak Gupta 2024-04-03 23:35 ` Deepak Gupta 2024-04-03 23:35 ` [PATCH v3 23/29] riscv signal: Save and restore of shadow stack for signal Deepak Gupta 2024-04-03 23:35 ` Deepak Gupta 2024-04-03 23:35 ` [PATCH v3 24/29] riscv/ptrace: riscv cfi status and state via ptrace and in core files Deepak Gupta 2024-04-03 23:35 ` Deepak Gupta 2024-04-03 23:35 ` [PATCH v3 25/29] riscv/hwprobe: zicfilp / zicfiss enumeration in hwprobe Deepak Gupta 2024-04-03 23:35 ` Deepak Gupta 2024-04-03 23:35 ` [PATCH v3 26/29] riscv: create a config for shadow stack and landing pad instr support Deepak Gupta 2024-04-03 23:35 ` Deepak Gupta 2024-04-03 23:35 ` [PATCH v3 27/29] riscv: Documentation for landing pad / indirect branch tracking Deepak Gupta 2024-04-03 23:35 ` Deepak Gupta 2024-05-10 20:30 ` Charlie Jenkins 2024-05-10 20:30 ` Charlie Jenkins 2024-05-13 17:07 ` Deepak Gupta 2024-05-13 17:07 ` Deepak Gupta 2024-04-03 23:35 ` [PATCH v3 28/29] riscv: Documentation for shadow stack on riscv Deepak Gupta 2024-04-03 23:35 ` Deepak Gupta 2024-04-03 23:35 ` [PATCH v3 29/29] kselftest/riscv: kselftest for user mode cfi Deepak Gupta 2024-04-03 23:35 ` Deepak Gupta 2024-05-09 18:21 ` Charlie Jenkins 2024-05-09 18:21 ` Charlie Jenkins 2024-05-09 19:16 ` Deepak Gupta 2024-05-09 19:16 ` Deepak Gupta 2024-05-10 1:20 ` Charlie Jenkins 2024-05-10 1:20 ` Charlie Jenkins 2024-05-09 0:33 ` [PATCH v3 00/29] riscv control-flow integrity for usermode Charlie Jenkins 2024-05-09 0:33 ` Charlie Jenkins
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