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5458989a0e
The six following functions have become simple single-line fonctions that do not have much added value anymore: - allow_read_from_user() - allow_write_to_user() - allow_read_write_user() - prevent_read_from_user() - prevent_write_to_user() - prevent_read_write_user() Directly call allow_user_access() and prevent_user_access(), it doesn't reduce the readability and it removes unnecessary middle functions. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com> Link: https://patch.msgid.link/70971f0ba81eab742a120e5bfdeff6b42d08fd98.1766574657.git.chleroy@kernel.org
137 lines
3.0 KiB
C
137 lines
3.0 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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#ifndef __ASSEMBLER__
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#include <linux/types.h>
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static __always_inline bool kuap_is_disabled(void);
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#endif
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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
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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 __ASSEMBLER__
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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 /* !__ASSEMBLER__ */
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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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static __always_inline bool kuap_is_disabled(void)
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{
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return !mmu_has_feature(MMU_FTR_KUAP);
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}
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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 __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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return false;
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}
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static __always_inline void kuap_user_restore(struct pt_regs *regs) { }
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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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* 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 __always_inline void allow_user_access(void __user *to, unsigned long dir) { }
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static __always_inline void prevent_user_access(unsigned long dir) { }
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static __always_inline unsigned long prevent_user_access_return(void) { return 0UL; }
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static __always_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_lock(void)
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{
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#ifdef __kuap_lock
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if (kuap_is_disabled())
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return;
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__kuap_lock();
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#endif
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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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#ifdef __kuap_save_and_lock
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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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#endif
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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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#ifdef __kuap_get_and_assert_locked
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if (!kuap_is_disabled())
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return __kuap_get_and_assert_locked();
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#endif
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return 0;
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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 (IS_ENABLED(CONFIG_PPC_KUAP_DEBUG))
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kuap_get_and_assert_locked();
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}
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#endif /* !__ASSEMBLER__ */
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#endif /* _ASM_POWERPC_KUAP_H_ */
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