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