]>
git.ipfire.org Git - thirdparty/linux.git/blob - arch/arm64/include/asm/pointer_auth.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ASM_POINTER_AUTH_H
3 #define __ASM_POINTER_AUTH_H
5 #include <linux/bitops.h>
6 #include <linux/random.h>
8 #include <asm/cpufeature.h>
9 #include <asm/memory.h>
10 #include <asm/sysreg.h>
12 #ifdef CONFIG_ARM64_PTR_AUTH
14 * Each key is a 128-bit quantity which is split across a pair of 64-bit
15 * registers (Lo and Hi).
22 * We give each process its own keys, which are shared by all threads. The keys
23 * are inherited upon fork(), and reinitialised upon exec*().
25 struct ptrauth_keys_user
{
26 struct ptrauth_key apia
;
27 struct ptrauth_key apib
;
28 struct ptrauth_key apda
;
29 struct ptrauth_key apdb
;
30 struct ptrauth_key apga
;
33 struct ptrauth_keys_kernel
{
34 struct ptrauth_key apia
;
37 static inline void ptrauth_keys_init_user(struct ptrauth_keys_user
*keys
)
39 if (system_supports_address_auth()) {
40 get_random_bytes(&keys
->apia
, sizeof(keys
->apia
));
41 get_random_bytes(&keys
->apib
, sizeof(keys
->apib
));
42 get_random_bytes(&keys
->apda
, sizeof(keys
->apda
));
43 get_random_bytes(&keys
->apdb
, sizeof(keys
->apdb
));
46 if (system_supports_generic_auth())
47 get_random_bytes(&keys
->apga
, sizeof(keys
->apga
));
50 #define __ptrauth_key_install(k, v) \
52 struct ptrauth_key __pki_v = (v); \
53 write_sysreg_s(__pki_v.lo, SYS_ ## k ## KEYLO_EL1); \
54 write_sysreg_s(__pki_v.hi, SYS_ ## k ## KEYHI_EL1); \
57 static __always_inline
void ptrauth_keys_init_kernel(struct ptrauth_keys_kernel
*keys
)
59 if (system_supports_address_auth())
60 get_random_bytes(&keys
->apia
, sizeof(keys
->apia
));
63 static __always_inline
void ptrauth_keys_switch_kernel(struct ptrauth_keys_kernel
*keys
)
65 if (system_supports_address_auth())
66 __ptrauth_key_install(APIA
, keys
->apia
);
69 extern int ptrauth_prctl_reset_keys(struct task_struct
*tsk
, unsigned long arg
);
71 static inline unsigned long ptrauth_strip_insn_pac(unsigned long ptr
)
73 return ptrauth_clear_pac(ptr
);
76 #define ptrauth_thread_init_user(tsk) \
77 ptrauth_keys_init_user(&(tsk)->thread.keys_user)
78 #define ptrauth_thread_init_kernel(tsk) \
79 ptrauth_keys_init_kernel(&(tsk)->thread.keys_kernel)
80 #define ptrauth_thread_switch_kernel(tsk) \
81 ptrauth_keys_switch_kernel(&(tsk)->thread.keys_kernel)
83 #else /* CONFIG_ARM64_PTR_AUTH */
84 #define ptrauth_prctl_reset_keys(tsk, arg) (-EINVAL)
85 #define ptrauth_strip_insn_pac(lr) (lr)
86 #define ptrauth_thread_init_user(tsk)
87 #define ptrauth_thread_init_kernel(tsk)
88 #define ptrauth_thread_switch_kernel(tsk)
89 #endif /* CONFIG_ARM64_PTR_AUTH */
91 #endif /* __ASM_POINTER_AUTH_H */