mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2025-01-09 23:34:42 +08:00
240efd717c
All KUAP helpers defined in asm/kup.h are single line functions that should be inlined. But on book3s/32 build, we get many instances of <prevent_write_to_user.constprop.0>. Force inlining of those helpers. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/8479a862e165a57a855292d47e24c259a578f5a0.1622711627.git.christophe.leroy@csgroup.eu
139 lines
3.3 KiB
C
139 lines
3.3 KiB
C
/* 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)
|
|
|
|
#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_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 */
|
|
|
|
#ifndef CONFIG_PPC_BOOK3S_32
|
|
static inline void kuep_lock(void) { }
|
|
static inline void kuep_unlock(void) { }
|
|
#endif
|
|
|
|
#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_assert_locked(void) { }
|
|
static inline void kuap_save_and_lock(struct pt_regs *regs) { }
|
|
static inline void kuap_user_restore(struct pt_regs *regs) { }
|
|
static inline void kuap_kernel_restore(struct pt_regs *regs, unsigned long amr) { }
|
|
|
|
static inline unsigned long kuap_get_and_assert_locked(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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(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 __always_inline void allow_read_from_user(const void __user *from, unsigned long size)
|
|
{
|
|
barrier_nospec();
|
|
allow_user_access(NULL, from, size, KUAP_READ);
|
|
}
|
|
|
|
static __always_inline void allow_write_to_user(void __user *to, unsigned long size)
|
|
{
|
|
allow_user_access(to, NULL, size, KUAP_WRITE);
|
|
}
|
|
|
|
static __always_inline void allow_read_write_user(void __user *to, const void __user *from,
|
|
unsigned long size)
|
|
{
|
|
barrier_nospec();
|
|
allow_user_access(to, from, size, KUAP_READ_WRITE);
|
|
}
|
|
|
|
static __always_inline void prevent_read_from_user(const void __user *from, unsigned long size)
|
|
{
|
|
prevent_user_access(KUAP_READ);
|
|
}
|
|
|
|
static __always_inline void prevent_write_to_user(void __user *to, unsigned long size)
|
|
{
|
|
prevent_user_access(KUAP_WRITE);
|
|
}
|
|
|
|
static __always_inline void prevent_read_write_user(void __user *to, const void __user *from,
|
|
unsigned long size)
|
|
{
|
|
prevent_user_access(KUAP_READ_WRITE);
|
|
}
|
|
|
|
static __always_inline void prevent_current_access_user(void)
|
|
{
|
|
prevent_user_access(KUAP_READ_WRITE);
|
|
}
|
|
|
|
static __always_inline void prevent_current_read_from_user(void)
|
|
{
|
|
prevent_user_access(KUAP_READ);
|
|
}
|
|
|
|
static __always_inline void prevent_current_write_to_user(void)
|
|
{
|
|
prevent_user_access(KUAP_WRITE);
|
|
}
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
#endif /* _ASM_POWERPC_KUAP_H_ */
|