diff --git a/arch/powerpc/include/asm/mmu_context.h b/arch/powerpc/include/asm/mmu_context.h index df9bf3ed025b408a85385a406e335a8c51878a90..4eaab40e3ade3663b13dcd155ed9258d276534a0 100644 --- a/arch/powerpc/include/asm/mmu_context.h +++ b/arch/powerpc/include/asm/mmu_context.h @@ -149,7 +149,7 @@ static inline void arch_bprm_mm_init(struct mm_struct *mm, } static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, - bool write, bool foreign) + bool write, bool execute, bool foreign) { /* by default, allow everything */ return true; diff --git a/arch/s390/include/asm/mmu_context.h b/arch/s390/include/asm/mmu_context.h index 8906600922ce916add497a7cf659c987d29e7364..fa66b6dfa97a6c896a7235cf1cabdf2e29382dd9 100644 --- a/arch/s390/include/asm/mmu_context.h +++ b/arch/s390/include/asm/mmu_context.h @@ -131,7 +131,7 @@ static inline void arch_bprm_mm_init(struct mm_struct *mm, } static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, - bool write, bool foreign) + bool write, bool execute, bool foreign) { /* by default, allow everything */ return true; diff --git a/arch/x86/include/asm/mmu_context.h b/arch/x86/include/asm/mmu_context.h index b4d939a17e609ec771f5579c9b7350f68e8cb0f6..6572b949cbca61bbe37ceba849a84695067ef866 100644 --- a/arch/x86/include/asm/mmu_context.h +++ b/arch/x86/include/asm/mmu_context.h @@ -323,8 +323,11 @@ static inline bool vma_is_foreign(struct vm_area_struct *vma) } static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, - bool write, bool foreign) + bool write, bool execute, bool foreign) { + /* pkeys never affect instruction fetches */ + if (execute) + return true; /* allow access if the VMA is not one from this process */ if (foreign || vma_is_foreign(vma)) return true; diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index 68ecdffe284e64cc932e754774fb4072eb093017..d81744e6f39f24d3dc36c50f550cebf977533c9c 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -908,7 +908,8 @@ static inline bool bad_area_access_from_pkeys(unsigned long error_code, if (error_code & PF_PK) return true; /* this checks permission keys on the VMA: */ - if (!arch_vma_access_permitted(vma, (error_code & PF_WRITE), foreign)) + if (!arch_vma_access_permitted(vma, (error_code & PF_WRITE), + (error_code & PF_INSTR), foreign)) return true; return false; } @@ -1112,7 +1113,8 @@ access_error(unsigned long error_code, struct vm_area_struct *vma) * faults just to hit a PF_PK as soon as we fill in a * page. */ - if (!arch_vma_access_permitted(vma, (error_code & PF_WRITE), foreign)) + if (!arch_vma_access_permitted(vma, (error_code & PF_WRITE), + (error_code & PF_INSTR), foreign)) return 1; if (error_code & PF_WRITE) { @@ -1267,6 +1269,8 @@ __do_page_fault(struct pt_regs *regs, unsigned long error_code, if (error_code & PF_WRITE) flags |= FAULT_FLAG_WRITE; + if (error_code & PF_INSTR) + flags |= FAULT_FLAG_INSTRUCTION; /* * When running in the kernel we expect faults to occur only to diff --git a/include/asm-generic/mm_hooks.h b/include/asm-generic/mm_hooks.h index d5c9633bd9558acece222238299e9c7fcb34e7d3..cc5d9a1405df925c43ec62a03be03c30ae921f56 100644 --- a/include/asm-generic/mm_hooks.h +++ b/include/asm-generic/mm_hooks.h @@ -27,7 +27,7 @@ static inline void arch_bprm_mm_init(struct mm_struct *mm, } static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, - bool write, bool foreign) + bool write, bool execute, bool foreign) { /* by default, allow everything */ return true; diff --git a/include/linux/mm.h b/include/linux/mm.h index 2aaa0f0d67ea07559d4de6a3899639a0c7adf539..7955c3eb83dbf663f9aa8ebe2c719e9267b79425 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -252,6 +252,7 @@ extern pgprot_t protection_map[16]; #define FAULT_FLAG_TRIED 0x20 /* Second try */ #define FAULT_FLAG_USER 0x40 /* The fault originated in userspace */ #define FAULT_FLAG_REMOTE 0x80 /* faulting for non current tsk/mm */ +#define FAULT_FLAG_INSTRUCTION 0x100 /* The fault was during an instruction fetch */ /* * vm_fault is filled by the the pagefault handler and passed to the vma's diff --git a/mm/gup.c b/mm/gup.c index d276760163b3384c8d54d65c1ed81caa46c4931d..7f1c4fb77cfa5e9c6ca4fd4c04c83e01a9b273b1 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -449,7 +449,11 @@ static int check_vma_flags(struct vm_area_struct *vma, unsigned long gup_flags) if (!(vm_flags & VM_MAYREAD)) return -EFAULT; } - if (!arch_vma_access_permitted(vma, write, foreign)) + /* + * gups are always data accesses, not instruction + * fetches, so execute=false here + */ + if (!arch_vma_access_permitted(vma, write, false, foreign)) return -EFAULT; return 0; } @@ -629,8 +633,11 @@ bool vma_permits_fault(struct vm_area_struct *vma, unsigned int fault_flags) /* * The architecture might have a hardware protection * mechanism other than read/write that can deny access. + * + * gup always represents data access, not instruction + * fetches, so execute=false here: */ - if (!arch_vma_access_permitted(vma, write, foreign)) + if (!arch_vma_access_permitted(vma, write, false, foreign)) return false; return true; diff --git a/mm/memory.c b/mm/memory.c index 76c44e5dffa2b6c0a157f4af6e640323084a7388..99e9f928264ac30190aacb712cca42357ff56daa 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3380,6 +3380,7 @@ static int __handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma, pte_t *pte; if (!arch_vma_access_permitted(vma, flags & FAULT_FLAG_WRITE, + flags & FAULT_FLAG_INSTRUCTION, flags & FAULT_FLAG_REMOTE)) return VM_FAULT_SIGSEGV;