216 lines
4.8 KiB
C
216 lines
4.8 KiB
C
/* 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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#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_BOOKE_OR_40x
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#include <asm/nohash/kup-booke.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_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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void setup_kup(void);
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void setup_kuep(bool disabled);
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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 __always_inline bool kuap_is_disabled(void) { return true; }
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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_lock(void) { }
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static inline void __kuap_save_and_lock(struct pt_regs *regs) { }
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static inline void kuap_user_restore(struct pt_regs *regs) { }
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static inline void __kuap_kernel_restore(struct pt_regs *regs, unsigned long amr) { }
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static inline unsigned long __kuap_get_and_assert_locked(void)
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{
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return 0;
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}
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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(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 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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if (kuap_is_disabled())
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return false;
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return __bad_kuap_fault(regs, address, is_write);
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}
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static __always_inline void kuap_assert_locked(void)
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{
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if (kuap_is_disabled())
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return;
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if (IS_ENABLED(CONFIG_PPC_KUAP_DEBUG))
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__kuap_get_and_assert_locked();
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}
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static __always_inline void kuap_lock(void)
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{
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if (kuap_is_disabled())
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return;
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__kuap_lock();
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}
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static __always_inline void kuap_save_and_lock(struct pt_regs *regs)
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{
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if (kuap_is_disabled())
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return;
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__kuap_save_and_lock(regs);
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}
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static __always_inline void kuap_kernel_restore(struct pt_regs *regs, unsigned long amr)
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{
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if (kuap_is_disabled())
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return;
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__kuap_kernel_restore(regs, amr);
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}
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static __always_inline unsigned long kuap_get_and_assert_locked(void)
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{
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if (kuap_is_disabled())
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return 0;
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return __kuap_get_and_assert_locked();
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}
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#ifndef CONFIG_PPC_BOOK3S_64
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static __always_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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{
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if (kuap_is_disabled())
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return;
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__allow_user_access(to, from, size, dir);
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}
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static __always_inline void prevent_user_access(unsigned long dir)
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{
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if (kuap_is_disabled())
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return;
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__prevent_user_access(dir);
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}
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static __always_inline unsigned long prevent_user_access_return(void)
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{
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if (kuap_is_disabled())
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return 0;
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return __prevent_user_access_return();
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}
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static __always_inline void restore_user_access(unsigned long flags)
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{
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if (kuap_is_disabled())
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return;
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__restore_user_access(flags);
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}
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#endif /* CONFIG_PPC_BOOK3S_64 */
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static __always_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 __always_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 __always_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 __always_inline void prevent_read_from_user(const void __user *from, unsigned long size)
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{
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prevent_user_access(KUAP_READ);
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}
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static __always_inline void prevent_write_to_user(void __user *to, unsigned long size)
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{
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prevent_user_access(KUAP_WRITE);
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}
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static __always_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(KUAP_READ_WRITE);
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}
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static __always_inline void prevent_current_access_user(void)
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{
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prevent_user_access(KUAP_READ_WRITE);
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}
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static __always_inline void prevent_current_read_from_user(void)
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{
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prevent_user_access(KUAP_READ);
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}
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static __always_inline void prevent_current_write_to_user(void)
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{
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prevent_user_access(KUAP_WRITE);
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}
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#endif /* !__ASSEMBLY__ */
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#endif /* _ASM_POWERPC_KUAP_H_ */
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