| /* 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_READ 4 |
| #define KUAP_CURRENT_WRITE 8 |
| #define KUAP_CURRENT (KUAP_CURRENT_READ | KUAP_CURRENT_WRITE) |
| |
| #ifdef CONFIG_PPC_BOOK3S_64 |
| #include <asm/book3s/64/kup.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 |
| |
| .macro kuap_check_amr gpr1, gpr2 |
| .endm |
| |
| #endif |
| |
| #else /* !__ASSEMBLY__ */ |
| |
| extern bool disable_kuep; |
| extern bool disable_kuap; |
| |
| #include <linux/pgtable.h> |
| |
| #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 bool |
| bad_kuap_fault(struct pt_regs *regs, unsigned long address, bool is_write) |
| { |
| return false; |
| } |
| |
| static inline void kuap_check_amr(void) { } |
| |
| /* |
| * book3s/64/kup-radix.h defines these functions for the !KUAP case to flush |
| * the L1D cache after user accesses. Only include the empty stubs for other |
| * platforms. |
| */ |
| #ifndef CONFIG_PPC_BOOK3S_64 |
| 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) { } |
| #endif /* CONFIG_PPC_BOOK3S_64 */ |
| #endif /* CONFIG_PPC_KUAP */ |
| |
| static __always_inline void setup_kup(void) |
| { |
| setup_kuep(disable_kuep); |
| setup_kuap(disable_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); |
| } |
| |
| static inline void prevent_current_read_from_user(void) |
| { |
| prevent_user_access(NULL, NULL, ~0UL, KUAP_CURRENT_READ); |
| } |
| |
| static inline void prevent_current_write_to_user(void) |
| { |
| prevent_user_access(NULL, NULL, ~0UL, KUAP_CURRENT_WRITE); |
| } |
| |
| #endif /* !__ASSEMBLY__ */ |
| |
| #endif /* _ASM_POWERPC_KUAP_H_ */ |