1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_POWERPC_KUP_H_
3 #define _ASM_POWERPC_KUP_H_
7 #define KUAP_READ_WRITE (KUAP_READ | KUAP_WRITE)
9 * For prevent_user_access() only.
10 * Use the current saved situation instead of the to/from/size params.
13 #define KUAP_CURRENT_READ 4
14 #define KUAP_CURRENT_WRITE 8
15 #define KUAP_CURRENT (KUAP_CURRENT_READ | KUAP_CURRENT_WRITE)
18 #include <asm/book3s/64/kup-radix.h>
21 #include <asm/nohash/32/kup-8xx.h>
23 #ifdef CONFIG_PPC_BOOK3S_32
24 #include <asm/book3s/32/kup.h>
28 #ifndef CONFIG_PPC_KUAP
29 .macro kuap_save_and_lock sp, thread, gpr1, gpr2, gpr3
32 .macro kuap_restore sp, current, gpr1, gpr2, gpr3
35 .macro kuap_check current, gpr
40 #else /* !__ASSEMBLY__ */
42 #include <linux/pgtable.h>
46 #ifdef CONFIG_PPC_KUEP
47 void setup_kuep(bool disabled);
49 static inline void setup_kuep(bool disabled) { }
50 #endif /* CONFIG_PPC_KUEP */
52 #ifdef CONFIG_PPC_KUAP
53 void setup_kuap(bool disabled);
55 static inline void setup_kuap(bool disabled) { }
56 static inline void allow_user_access(void __user *to, const void __user *from,
57 unsigned long size, unsigned long dir) { }
58 static inline void prevent_user_access(void __user *to, const void __user *from,
59 unsigned long size, unsigned long dir) { }
60 static inline unsigned long prevent_user_access_return(void) { return 0UL; }
61 static inline void restore_user_access(unsigned long flags) { }
63 bad_kuap_fault(struct pt_regs *regs, unsigned long address, bool is_write)
67 #endif /* CONFIG_PPC_KUAP */
69 static inline void allow_read_from_user(const void __user *from, unsigned long size)
71 allow_user_access(NULL, from, size, KUAP_READ);
74 static inline void allow_write_to_user(void __user *to, unsigned long size)
76 allow_user_access(to, NULL, size, KUAP_WRITE);
79 static inline void allow_read_write_user(void __user *to, const void __user *from,
82 allow_user_access(to, from, size, KUAP_READ_WRITE);
85 static inline void prevent_read_from_user(const void __user *from, unsigned long size)
87 prevent_user_access(NULL, from, size, KUAP_READ);
90 static inline void prevent_write_to_user(void __user *to, unsigned long size)
92 prevent_user_access(to, NULL, size, KUAP_WRITE);
95 static inline void prevent_read_write_user(void __user *to, const void __user *from,
98 prevent_user_access(to, from, size, KUAP_READ_WRITE);
101 static inline void prevent_current_access_user(void)
103 prevent_user_access(NULL, NULL, ~0UL, KUAP_CURRENT);
106 static inline void prevent_current_read_from_user(void)
108 prevent_user_access(NULL, NULL, ~0UL, KUAP_CURRENT_READ);
111 static inline void prevent_current_write_to_user(void)
113 prevent_user_access(NULL, NULL, ~0UL, KUAP_CURRENT_WRITE);
116 #endif /* !__ASSEMBLY__ */
118 #endif /* _ASM_POWERPC_KUAP_H_ */