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143 lines
3.4 KiB
143 lines
3.4 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_POWERPC_KUP_H_ |
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#define _ASM_POWERPC_KUP_H_ |
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#define KUAP_READ 1 |
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#define KUAP_WRITE 2 |
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#define KUAP_READ_WRITE (KUAP_READ | KUAP_WRITE) |
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/* |
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* For prevent_user_access() only. |
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* Use the current saved situation instead of the to/from/size params. |
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* Used on book3s/32 |
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*/ |
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#define KUAP_CURRENT_READ 4 |
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#define KUAP_CURRENT_WRITE 8 |
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#define KUAP_CURRENT (KUAP_CURRENT_READ | KUAP_CURRENT_WRITE) |
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#ifdef CONFIG_PPC_BOOK3S_64 |
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#include <asm/book3s/64/kup.h> |
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#endif |
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#ifdef CONFIG_PPC_8xx |
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#include <asm/nohash/32/kup-8xx.h> |
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#endif |
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#ifdef CONFIG_PPC_BOOK3S_32 |
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#include <asm/book3s/32/kup.h> |
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#endif |
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#ifdef __ASSEMBLY__ |
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#ifndef CONFIG_PPC_KUAP |
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.macro kuap_save_and_lock sp, thread, gpr1, gpr2, gpr3 |
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.endm |
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.macro kuap_restore sp, current, gpr1, gpr2, gpr3 |
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.endm |
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.macro kuap_check current, gpr |
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.endm |
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.macro kuap_check_amr gpr1, gpr2 |
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.endm |
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#endif |
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#else /* !__ASSEMBLY__ */ |
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extern bool disable_kuep; |
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extern bool disable_kuap; |
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#include <linux/pgtable.h> |
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#ifdef CONFIG_PPC_KUEP |
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void setup_kuep(bool disabled); |
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#else |
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static inline void setup_kuep(bool disabled) { } |
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#endif /* CONFIG_PPC_KUEP */ |
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#ifdef CONFIG_PPC_KUAP |
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void setup_kuap(bool disabled); |
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#else |
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static inline void setup_kuap(bool disabled) { } |
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static inline bool |
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bad_kuap_fault(struct pt_regs *regs, unsigned long address, bool is_write) |
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{ |
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return false; |
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} |
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static inline void kuap_check_amr(void) { } |
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/* |
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* book3s/64/kup-radix.h defines these functions for the !KUAP case to flush |
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* the L1D cache after user accesses. Only include the empty stubs for other |
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* platforms. |
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*/ |
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#ifndef CONFIG_PPC_BOOK3S_64 |
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static inline void allow_user_access(void __user *to, const void __user *from, |
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unsigned long size, unsigned long dir) { } |
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static inline void prevent_user_access(void __user *to, const void __user *from, |
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unsigned long size, unsigned long dir) { } |
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static inline unsigned long prevent_user_access_return(void) { return 0UL; } |
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static inline void restore_user_access(unsigned long flags) { } |
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#endif /* CONFIG_PPC_BOOK3S_64 */ |
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#endif /* CONFIG_PPC_KUAP */ |
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static __always_inline void setup_kup(void) |
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{ |
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setup_kuep(disable_kuep); |
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setup_kuap(disable_kuap); |
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} |
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static inline void allow_read_from_user(const void __user *from, unsigned long size) |
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{ |
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barrier_nospec(); |
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allow_user_access(NULL, from, size, KUAP_READ); |
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} |
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static inline void allow_write_to_user(void __user *to, unsigned long size) |
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{ |
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allow_user_access(to, NULL, size, KUAP_WRITE); |
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} |
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static inline void allow_read_write_user(void __user *to, const void __user *from, |
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unsigned long size) |
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{ |
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barrier_nospec(); |
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allow_user_access(to, from, size, KUAP_READ_WRITE); |
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} |
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static inline void prevent_read_from_user(const void __user *from, unsigned long size) |
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{ |
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prevent_user_access(NULL, from, size, KUAP_READ); |
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} |
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static inline void prevent_write_to_user(void __user *to, unsigned long size) |
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{ |
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prevent_user_access(to, NULL, size, KUAP_WRITE); |
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} |
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static inline void prevent_read_write_user(void __user *to, const void __user *from, |
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unsigned long size) |
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{ |
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prevent_user_access(to, from, size, KUAP_READ_WRITE); |
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} |
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static inline void prevent_current_access_user(void) |
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{ |
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prevent_user_access(NULL, NULL, ~0UL, KUAP_CURRENT); |
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} |
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static inline void prevent_current_read_from_user(void) |
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{ |
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prevent_user_access(NULL, NULL, ~0UL, KUAP_CURRENT_READ); |
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} |
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static inline void prevent_current_write_to_user(void) |
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{ |
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prevent_user_access(NULL, NULL, ~0UL, KUAP_CURRENT_WRITE); |
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} |
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#endif /* !__ASSEMBLY__ */ |
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#endif /* _ASM_POWERPC_KUAP_H_ */
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