mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
104 lines
2.8 KiB
104 lines
2.8 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
|
#ifndef __ASM_POINTER_AUTH_H |
|
#define __ASM_POINTER_AUTH_H |
|
|
|
#include <linux/bitops.h> |
|
#include <linux/random.h> |
|
|
|
#include <asm/cpufeature.h> |
|
#include <asm/memory.h> |
|
#include <asm/sysreg.h> |
|
|
|
#ifdef CONFIG_ARM64_PTR_AUTH |
|
/* |
|
* Each key is a 128-bit quantity which is split across a pair of 64-bit |
|
* registers (Lo and Hi). |
|
*/ |
|
struct ptrauth_key { |
|
unsigned long lo, hi; |
|
}; |
|
|
|
/* |
|
* We give each process its own keys, which are shared by all threads. The keys |
|
* are inherited upon fork(), and reinitialised upon exec*(). |
|
*/ |
|
struct ptrauth_keys_user { |
|
struct ptrauth_key apia; |
|
struct ptrauth_key apib; |
|
struct ptrauth_key apda; |
|
struct ptrauth_key apdb; |
|
struct ptrauth_key apga; |
|
}; |
|
|
|
struct ptrauth_keys_kernel { |
|
struct ptrauth_key apia; |
|
}; |
|
|
|
static inline void ptrauth_keys_init_user(struct ptrauth_keys_user *keys) |
|
{ |
|
if (system_supports_address_auth()) { |
|
get_random_bytes(&keys->apia, sizeof(keys->apia)); |
|
get_random_bytes(&keys->apib, sizeof(keys->apib)); |
|
get_random_bytes(&keys->apda, sizeof(keys->apda)); |
|
get_random_bytes(&keys->apdb, sizeof(keys->apdb)); |
|
} |
|
|
|
if (system_supports_generic_auth()) |
|
get_random_bytes(&keys->apga, sizeof(keys->apga)); |
|
} |
|
|
|
#define __ptrauth_key_install_nosync(k, v) \ |
|
do { \ |
|
struct ptrauth_key __pki_v = (v); \ |
|
write_sysreg_s(__pki_v.lo, SYS_ ## k ## KEYLO_EL1); \ |
|
write_sysreg_s(__pki_v.hi, SYS_ ## k ## KEYHI_EL1); \ |
|
} while (0) |
|
|
|
static __always_inline void ptrauth_keys_init_kernel(struct ptrauth_keys_kernel *keys) |
|
{ |
|
if (system_supports_address_auth()) |
|
get_random_bytes(&keys->apia, sizeof(keys->apia)); |
|
} |
|
|
|
static __always_inline void ptrauth_keys_switch_kernel(struct ptrauth_keys_kernel *keys) |
|
{ |
|
if (!system_supports_address_auth()) |
|
return; |
|
|
|
__ptrauth_key_install_nosync(APIA, keys->apia); |
|
isb(); |
|
} |
|
|
|
extern int ptrauth_prctl_reset_keys(struct task_struct *tsk, unsigned long arg); |
|
|
|
static inline unsigned long ptrauth_strip_insn_pac(unsigned long ptr) |
|
{ |
|
return ptrauth_clear_pac(ptr); |
|
} |
|
|
|
static __always_inline void ptrauth_enable(void) |
|
{ |
|
if (!system_supports_address_auth()) |
|
return; |
|
sysreg_clear_set(sctlr_el1, 0, (SCTLR_ELx_ENIA | SCTLR_ELx_ENIB | |
|
SCTLR_ELx_ENDA | SCTLR_ELx_ENDB)); |
|
isb(); |
|
} |
|
|
|
#define ptrauth_thread_init_user(tsk) \ |
|
ptrauth_keys_init_user(&(tsk)->thread.keys_user) |
|
#define ptrauth_thread_init_kernel(tsk) \ |
|
ptrauth_keys_init_kernel(&(tsk)->thread.keys_kernel) |
|
#define ptrauth_thread_switch_kernel(tsk) \ |
|
ptrauth_keys_switch_kernel(&(tsk)->thread.keys_kernel) |
|
|
|
#else /* CONFIG_ARM64_PTR_AUTH */ |
|
#define ptrauth_enable() |
|
#define ptrauth_prctl_reset_keys(tsk, arg) (-EINVAL) |
|
#define ptrauth_strip_insn_pac(lr) (lr) |
|
#define ptrauth_thread_init_user(tsk) |
|
#define ptrauth_thread_init_kernel(tsk) |
|
#define ptrauth_thread_switch_kernel(tsk) |
|
#endif /* CONFIG_ARM64_PTR_AUTH */ |
|
|
|
#endif /* __ASM_POINTER_AUTH_H */
|
|
|