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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 | /* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_POWERPC_KUP_H_ #define _ASM_POWERPC_KUP_H_ #define KUAP_READ 1 #define KUAP_WRITE 2 #define KUAP_READ_WRITE (KUAP_READ | KUAP_WRITE) /* * For prevent_user_access() only. * Use the current saved situation instead of the to/from/size params. * Used on book3s/32 */ #define KUAP_CURRENT 4 #ifdef CONFIG_PPC64 #include <asm/book3s/64/kup-radix.h> #endif #ifdef CONFIG_PPC_8xx #include <asm/nohash/32/kup-8xx.h> #endif #ifdef CONFIG_PPC_BOOK3S_32 #include <asm/book3s/32/kup.h> #endif #ifdef __ASSEMBLY__ #ifndef CONFIG_PPC_KUAP .macro kuap_save_and_lock sp, thread, gpr1, gpr2, gpr3 .endm .macro kuap_restore sp, current, gpr1, gpr2, gpr3 .endm .macro kuap_check current, gpr .endm #endif #else /* !__ASSEMBLY__ */ #include <asm/pgtable.h> void setup_kup(void); #ifdef CONFIG_PPC_KUEP void setup_kuep(bool disabled); #else static inline void setup_kuep(bool disabled) { } #endif /* CONFIG_PPC_KUEP */ #ifdef CONFIG_PPC_KUAP void setup_kuap(bool disabled); #else static inline void setup_kuap(bool disabled) { } static inline void allow_user_access(void __user *to, const void __user *from, unsigned long size, unsigned long dir) { } static inline void prevent_user_access(void __user *to, const void __user *from, unsigned long size, unsigned long dir) { } static inline unsigned long prevent_user_access_return(void) { return 0UL; } static inline void restore_user_access(unsigned long flags) { } static inline bool bad_kuap_fault(struct pt_regs *regs, unsigned long address, bool is_write) { return false; } #endif /* CONFIG_PPC_KUAP */ static inline void allow_read_from_user(const void __user *from, unsigned long size) { allow_user_access(NULL, from, size, KUAP_READ); } static inline void allow_write_to_user(void __user *to, unsigned long size) { allow_user_access(to, NULL, size, KUAP_WRITE); } static inline void allow_read_write_user(void __user *to, const void __user *from, unsigned long size) { allow_user_access(to, from, size, KUAP_READ_WRITE); } static inline void prevent_read_from_user(const void __user *from, unsigned long size) { prevent_user_access(NULL, from, size, KUAP_READ); } static inline void prevent_write_to_user(void __user *to, unsigned long size) { prevent_user_access(to, NULL, size, KUAP_WRITE); } static inline void prevent_read_write_user(void __user *to, const void __user *from, unsigned long size) { prevent_user_access(to, from, size, KUAP_READ_WRITE); } static inline void prevent_current_access_user(void) { prevent_user_access(NULL, NULL, ~0UL, KUAP_CURRENT); } #endif /* !__ASSEMBLY__ */ #endif /* _ASM_POWERPC_KUAP_H_ */ |