1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_POWERPC_KUP_H_ 3 #define _ASM_POWERPC_KUP_H_ 4 5 #define KUAP_READ 1 6 #define KUAP_WRITE 2 7 #define KUAP_READ_WRITE (KUAP_READ | KUAP_WRITE) 8 /* 9 * For prevent_user_access() only. 10 * Use the current saved situation instead of the to/from/size params. 11 * Used on book3s/32 12 */ 13 #define KUAP_CURRENT_READ 4 14 #define KUAP_CURRENT_WRITE 8 15 #define KUAP_CURRENT (KUAP_CURRENT_READ | KUAP_CURRENT_WRITE) 16 17 #ifdef CONFIG_PPC_BOOK3S_64 18 #include <asm/book3s/64/kup.h> 19 #endif 20 21 #ifdef CONFIG_PPC_8xx 22 #include <asm/nohash/32/kup-8xx.h> 23 #endif 24 25 #ifdef CONFIG_PPC_BOOK3S_32 26 #include <asm/book3s/32/kup.h> 27 #endif 28 29 #ifdef __ASSEMBLY__ 30 #ifndef CONFIG_PPC_KUAP 31 .macro kuap_save_and_lock sp, thread, gpr1, gpr2, gpr3 32 .endm 33 34 .macro kuap_restore sp, current, gpr1, gpr2, gpr3 35 .endm 36 37 .macro kuap_check current, gpr 38 .endm 39 40 .macro kuap_check_amr gpr1, gpr2 41 .endm 42 43 #endif 44 45 #else /* !__ASSEMBLY__ */ 46 47 #include <linux/pgtable.h> 48 49 void setup_kup(void); 50 51 #ifdef CONFIG_PPC_KUEP 52 void setup_kuep(bool disabled); 53 #else 54 static inline void setup_kuep(bool disabled) { } 55 #endif /* CONFIG_PPC_KUEP */ 56 57 #ifdef CONFIG_PPC_KUAP 58 void setup_kuap(bool disabled); 59 #else 60 static inline void setup_kuap(bool disabled) { } 61 62 static inline bool bad_kuap_fault(struct pt_regs *regs, unsigned long address, 63 bool is_write, unsigned long error_code) 64 { 65 return false; 66 } 67 68 static inline void kuap_check_amr(void) { } 69 70 /* 71 * book3s/64/kup-radix.h defines these functions for the !KUAP case to flush 72 * the L1D cache after user accesses. Only include the empty stubs for other 73 * platforms. 74 */ 75 #ifndef CONFIG_PPC_BOOK3S_64 76 static inline void allow_user_access(void __user *to, const void __user *from, 77 unsigned long size, unsigned long dir) { } 78 static inline void prevent_user_access(void __user *to, const void __user *from, 79 unsigned long size, unsigned long dir) { } 80 static inline unsigned long prevent_user_access_return(void) { return 0UL; } 81 static inline void restore_user_access(unsigned long flags) { } 82 #endif /* CONFIG_PPC_BOOK3S_64 */ 83 #endif /* CONFIG_PPC_KUAP */ 84 85 static inline void allow_read_from_user(const void __user *from, unsigned long size) 86 { 87 allow_user_access(NULL, from, size, KUAP_READ); 88 } 89 90 static inline void allow_write_to_user(void __user *to, unsigned long size) 91 { 92 allow_user_access(to, NULL, size, KUAP_WRITE); 93 } 94 95 static inline void allow_read_write_user(void __user *to, const void __user *from, 96 unsigned long size) 97 { 98 allow_user_access(to, from, size, KUAP_READ_WRITE); 99 } 100 101 static inline void prevent_read_from_user(const void __user *from, unsigned long size) 102 { 103 prevent_user_access(NULL, from, size, KUAP_READ); 104 } 105 106 static inline void prevent_write_to_user(void __user *to, unsigned long size) 107 { 108 prevent_user_access(to, NULL, size, KUAP_WRITE); 109 } 110 111 static inline void prevent_read_write_user(void __user *to, const void __user *from, 112 unsigned long size) 113 { 114 prevent_user_access(to, from, size, KUAP_READ_WRITE); 115 } 116 117 static inline void prevent_current_access_user(void) 118 { 119 prevent_user_access(NULL, NULL, ~0UL, KUAP_CURRENT); 120 } 121 122 static inline void prevent_current_read_from_user(void) 123 { 124 prevent_user_access(NULL, NULL, ~0UL, KUAP_CURRENT_READ); 125 } 126 127 static inline void prevent_current_write_to_user(void) 128 { 129 prevent_user_access(NULL, NULL, ~0UL, KUAP_CURRENT_WRITE); 130 } 131 132 #endif /* !__ASSEMBLY__ */ 133 134 #endif /* _ASM_POWERPC_KUAP_H_ */ 135