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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154/* SPDX-License-Identifier: GPL-2.0 */#ifndef __ASM_POINTER_AUTH_H#define __ASM_POINTER_AUTH_H
#include <linux/bitops.h>#include <linux/prctl.h>#include <linux/random.h>
#include <asm/cpufeature.h>#include <asm/memory.h>#include <asm/sysreg.h>
/* * The EL0/EL1 pointer bits used by a pointer authentication code. * This is dependent on TBI0/TBI1 being enabled, or bits 63:56 would also apply. */#define ptrauth_user_pac_mask() GENMASK_ULL(54, vabits_actual)#define ptrauth_kernel_pac_mask() GENMASK_ULL(63, vabits_actual)
#define PR_PAC_ENABLED_KEYS_MASK \ (PR_PAC_APIAKEY | PR_PAC_APIBKEY | PR_PAC_APDAKEY | PR_PAC_APDBKEY)
#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;};
#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)
#ifdef CONFIG_ARM64_PTR_AUTH_KERNEL
struct ptrauth_keys_kernel { struct ptrauth_key apia;};
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();}
#endif /* CONFIG_ARM64_PTR_AUTH_KERNEL */
static inline void ptrauth_keys_install_user(struct ptrauth_keys_user *keys){ if (system_supports_address_auth()) { __ptrauth_key_install_nosync(APIB, keys->apib); __ptrauth_key_install_nosync(APDA, keys->apda); __ptrauth_key_install_nosync(APDB, keys->apdb); }
if (system_supports_generic_auth()) __ptrauth_key_install_nosync(APGA, keys->apga);}
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));
ptrauth_keys_install_user(keys);}
extern int ptrauth_prctl_reset_keys(struct task_struct *tsk, unsigned long arg);
extern int ptrauth_set_enabled_keys(struct task_struct *tsk, unsigned long keys, unsigned long enabled);extern int ptrauth_get_enabled_keys(struct task_struct *tsk);
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_suspend_exit() \ ptrauth_keys_install_user(¤t->thread.keys_user)
#define ptrauth_thread_init_user() \ do { \ ptrauth_keys_init_user(¤t->thread.keys_user); \ \ /* enable all keys */ \ if (system_supports_address_auth()) \ ptrauth_set_enabled_keys(current, \ PR_PAC_ENABLED_KEYS_MASK, \ PR_PAC_ENABLED_KEYS_MASK); \ } while (0)
#define ptrauth_thread_switch_user(tsk) \ ptrauth_keys_install_user(&(tsk)->thread.keys_user)
#else /* CONFIG_ARM64_PTR_AUTH */#define ptrauth_enable()#define ptrauth_prctl_reset_keys(tsk, arg) (-EINVAL)#define ptrauth_set_enabled_keys(tsk, keys, enabled) (-EINVAL)#define ptrauth_get_enabled_keys(tsk) (-EINVAL)#define ptrauth_suspend_exit()#define ptrauth_thread_init_user()#define ptrauth_thread_switch_user(tsk)#endif /* CONFIG_ARM64_PTR_AUTH */
#ifdef CONFIG_ARM64_PTR_AUTH_KERNEL#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#define ptrauth_thread_init_kernel(tsk)#define ptrauth_thread_switch_kernel(tsk)#endif /* CONFIG_ARM64_PTR_AUTH_KERNEL */
#endif /* __ASM_POINTER_AUTH_H */