sevki
c9e1dba412
setup CI/CD for kernel development - added CodeQL for code scanning - every pr is built as an image and is available for 30days on https://oklinux.dev - tagged and released on github for now Signed-off-by: sevki <s@sevki.io>
112 lines
2.3 KiB
C
112 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _ASM_POWERPC_KUP_BOOKE_H_
|
|
#define _ASM_POWERPC_KUP_BOOKE_H_
|
|
|
|
#include <asm/bug.h>
|
|
#include <asm/mmu.h>
|
|
|
|
#ifdef CONFIG_PPC_KUAP
|
|
|
|
#ifdef __ASSEMBLY__
|
|
|
|
.macro kuap_check_amr gpr1, gpr2
|
|
.endm
|
|
|
|
#else
|
|
|
|
#include <linux/sched.h>
|
|
|
|
#include <asm/reg.h>
|
|
|
|
static __always_inline void __kuap_lock(void)
|
|
{
|
|
mtspr(SPRN_PID, 0);
|
|
isync();
|
|
}
|
|
#define __kuap_lock __kuap_lock
|
|
|
|
static __always_inline void __kuap_save_and_lock(struct pt_regs *regs)
|
|
{
|
|
regs->kuap = mfspr(SPRN_PID);
|
|
mtspr(SPRN_PID, 0);
|
|
isync();
|
|
}
|
|
#define __kuap_save_and_lock __kuap_save_and_lock
|
|
|
|
static __always_inline void kuap_user_restore(struct pt_regs *regs)
|
|
{
|
|
if (kuap_is_disabled())
|
|
return;
|
|
|
|
mtspr(SPRN_PID, current->thread.pid);
|
|
|
|
/* Context synchronisation is performed by rfi */
|
|
}
|
|
|
|
static __always_inline void __kuap_kernel_restore(struct pt_regs *regs, unsigned long kuap)
|
|
{
|
|
if (regs->kuap)
|
|
mtspr(SPRN_PID, current->thread.pid);
|
|
|
|
/* Context synchronisation is performed by rfi */
|
|
}
|
|
|
|
#ifdef CONFIG_PPC_KUAP_DEBUG
|
|
static __always_inline unsigned long __kuap_get_and_assert_locked(void)
|
|
{
|
|
WARN_ON_ONCE(mfspr(SPRN_PID));
|
|
|
|
return 0;
|
|
}
|
|
#define __kuap_get_and_assert_locked __kuap_get_and_assert_locked
|
|
#endif
|
|
|
|
static __always_inline void uaccess_begin_booke(unsigned long val)
|
|
{
|
|
asm(ASM_MMU_FTR_IFSET("mtspr %0, %1; isync", "", %2) : :
|
|
"i"(SPRN_PID), "r"(val), "i"(MMU_FTR_KUAP) : "memory");
|
|
}
|
|
|
|
static __always_inline void uaccess_end_booke(void)
|
|
{
|
|
asm(ASM_MMU_FTR_IFSET("mtspr %0, %1; isync", "", %2) : :
|
|
"i"(SPRN_PID), "r"(0), "i"(MMU_FTR_KUAP) : "memory");
|
|
}
|
|
|
|
static __always_inline void allow_user_access(void __user *to, const void __user *from,
|
|
unsigned long size, unsigned long dir)
|
|
{
|
|
uaccess_begin_booke(current->thread.pid);
|
|
}
|
|
|
|
static __always_inline void prevent_user_access(unsigned long dir)
|
|
{
|
|
uaccess_end_booke();
|
|
}
|
|
|
|
static __always_inline unsigned long prevent_user_access_return(void)
|
|
{
|
|
unsigned long flags = mfspr(SPRN_PID);
|
|
|
|
uaccess_end_booke();
|
|
|
|
return flags;
|
|
}
|
|
|
|
static __always_inline void restore_user_access(unsigned long flags)
|
|
{
|
|
if (flags)
|
|
uaccess_begin_booke(current->thread.pid);
|
|
}
|
|
|
|
static __always_inline bool
|
|
__bad_kuap_fault(struct pt_regs *regs, unsigned long address, bool is_write)
|
|
{
|
|
return !regs->kuap;
|
|
}
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
#endif /* CONFIG_PPC_KUAP */
|
|
|
|
#endif /* _ASM_POWERPC_KUP_BOOKE_H_ */
|