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 Subject: [PATCH v3 13/29] riscv mmu: write protect and shadow stack Date: Wed, 3 Apr 2024 16:35:01 -0700 [thread overview] Message-ID: <20240403234054.2020347-14-debug@rivosinc.com> (raw) In-Reply-To: <20240403234054.2020347-1-debug@rivosinc.com> `fork` implements copy on write (COW) by making pages readonly in child and parent both. ptep_set_wrprotect and pte_wrprotect clears _PAGE_WRITE in PTE. Assumption is that page is readable and on fault copy on write happens. To implement COW on such pages, clearing up W bit makes them XWR = 000. This will result in wrong PTE setting which says no perms but V=1 and PFN field pointing to final page. Instead desired behavior is to turn it into a readable page, take an access (load/store) fault on sspush/sspop (shadow stack) and then perform COW on such pages. This way regular reads would still be allowed and not lead to COW maintaining current behavior of COW on non-shadow stack but writeable memory. On the other hand it doesn't interfere with existing COW for read-write memory. Assumption is always that _PAGE_READ must have been set and thus setting _PAGE_READ is harmless. Signed-off-by: Deepak Gupta <debug@rivosinc.com> --- arch/riscv/include/asm/pgtable.h | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index 9b837239d3e8..7a1c2a98d272 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -398,7 +398,7 @@ static inline int pte_special(pte_t pte) static inline pte_t pte_wrprotect(pte_t pte) { - return __pte(pte_val(pte) & ~(_PAGE_WRITE)); + return __pte((pte_val(pte) & ~(_PAGE_WRITE)) | (_PAGE_READ)); } /* static inline pte_t pte_mkread(pte_t pte) */ @@ -581,7 +581,15 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm, static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep) { - atomic_long_and(~(unsigned long)_PAGE_WRITE, (atomic_long_t *)ptep); + volatile pte_t read_pte = *ptep; + /* + * ptep_set_wrprotect can be called for shadow stack ranges too. + * shadow stack memory is XWR = 010 and thus clearing _PAGE_WRITE will lead to + * encoding 000b which is wrong encoding with V = 1. This should lead to page fault + * but we dont want this wrong configuration to be set in page tables. + */ + atomic_long_set((atomic_long_t *)ptep, + ((pte_val(read_pte) & ~(unsigned long)_PAGE_WRITE) | _PAGE_READ)); } #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH -- 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 Subject: [PATCH v3 13/29] riscv mmu: write protect and shadow stack Date: Wed, 3 Apr 2024 16:35:01 -0700 [thread overview] Message-ID: <20240403234054.2020347-14-debug@rivosinc.com> (raw) In-Reply-To: <20240403234054.2020347-1-debug@rivosinc.com> `fork` implements copy on write (COW) by making pages readonly in child and parent both. ptep_set_wrprotect and pte_wrprotect clears _PAGE_WRITE in PTE. Assumption is that page is readable and on fault copy on write happens. To implement COW on such pages, clearing up W bit makes them XWR = 000. This will result in wrong PTE setting which says no perms but V=1 and PFN field pointing to final page. Instead desired behavior is to turn it into a readable page, take an access (load/store) fault on sspush/sspop (shadow stack) and then perform COW on such pages. This way regular reads would still be allowed and not lead to COW maintaining current behavior of COW on non-shadow stack but writeable memory. On the other hand it doesn't interfere with existing COW for read-write memory. Assumption is always that _PAGE_READ must have been set and thus setting _PAGE_READ is harmless. Signed-off-by: Deepak Gupta <debug@rivosinc.com> --- arch/riscv/include/asm/pgtable.h | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index 9b837239d3e8..7a1c2a98d272 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -398,7 +398,7 @@ static inline int pte_special(pte_t pte) static inline pte_t pte_wrprotect(pte_t pte) { - return __pte(pte_val(pte) & ~(_PAGE_WRITE)); + return __pte((pte_val(pte) & ~(_PAGE_WRITE)) | (_PAGE_READ)); } /* static inline pte_t pte_mkread(pte_t pte) */ @@ -581,7 +581,15 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm, static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep) { - atomic_long_and(~(unsigned long)_PAGE_WRITE, (atomic_long_t *)ptep); + volatile pte_t read_pte = *ptep; + /* + * ptep_set_wrprotect can be called for shadow stack ranges too. + * shadow stack memory is XWR = 010 and thus clearing _PAGE_WRITE will lead to + * encoding 000b which is wrong encoding with V = 1. This should lead to page fault + * but we dont want this wrong configuration to be set in page tables. + */ + atomic_long_set((atomic_long_t *)ptep, + ((pte_val(read_pte) & ~(unsigned long)_PAGE_WRITE) | _PAGE_READ)); } #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH -- 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 23:42 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 ` [PATCH v3 09/29] mm: abstract shadow stack vma behind `vma_is_shadow_stack` Deepak Gupta 2024-04-03 23:34 ` 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 ` Deepak Gupta [this message] 2024-04-03 23:35 ` [PATCH v3 13/29] riscv mmu: write protect and shadow stack 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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