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Diffstat (limited to 'arch/arm64/include/asm/pointer_auth.h')
-rw-r--r--arch/arm64/include/asm/pointer_auth.h61
1 files changed, 51 insertions, 10 deletions
diff --git a/arch/arm64/include/asm/pointer_auth.h b/arch/arm64/include/asm/pointer_auth.h
index b112a11e9302..d50416be99be 100644
--- a/arch/arm64/include/asm/pointer_auth.h
+++ b/arch/arm64/include/asm/pointer_auth.h
@@ -3,6 +3,7 @@
#define __ASM_POINTER_AUTH_H
#include <linux/bitops.h>
+#include <linux/prctl.h>
#include <linux/random.h>
#include <asm/cpufeature.h>
@@ -34,6 +35,25 @@ struct ptrauth_keys_kernel {
struct ptrauth_key apia;
};
+#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 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()) {
@@ -45,14 +65,9 @@ static inline void ptrauth_keys_init_user(struct ptrauth_keys_user *keys)
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)
+ ptrauth_keys_install_user(keys);
+}
static __always_inline void ptrauth_keys_init_kernel(struct ptrauth_keys_kernel *keys)
{
@@ -71,6 +86,10 @@ static __always_inline void ptrauth_keys_switch_kernel(struct ptrauth_keys_kerne
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 inline unsigned long ptrauth_strip_insn_pac(unsigned long ptr)
{
return ptrauth_clear_pac(ptr);
@@ -85,8 +104,23 @@ static __always_inline void ptrauth_enable(void)
isb();
}
-#define ptrauth_thread_init_user(tsk) \
- ptrauth_keys_init_user(&(tsk)->thread.keys_user)
+#define ptrauth_suspend_exit() \
+ ptrauth_keys_install_user(&current->thread.keys_user)
+
+#define ptrauth_thread_init_user() \
+ do { \
+ ptrauth_keys_init_user(&current->thread.keys_user); \
+ \
+ /* enable all keys */ \
+ if (system_supports_address_auth()) \
+ set_task_sctlr_el1(current->thread.sctlr_user | \
+ SCTLR_ELx_ENIA | SCTLR_ELx_ENIB | \
+ SCTLR_ELx_ENDA | SCTLR_ELx_ENDB); \
+ } while (0)
+
+#define ptrauth_thread_switch_user(tsk) \
+ ptrauth_keys_install_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) \
@@ -95,10 +129,17 @@ static __always_inline void ptrauth_enable(void)
#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_strip_insn_pac(lr) (lr)
-#define ptrauth_thread_init_user(tsk)
+#define ptrauth_suspend_exit()
+#define ptrauth_thread_init_user()
#define ptrauth_thread_init_kernel(tsk)
+#define ptrauth_thread_switch_user(tsk)
#define ptrauth_thread_switch_kernel(tsk)
#endif /* CONFIG_ARM64_PTR_AUTH */
+#define PR_PAC_ENABLED_KEYS_MASK \
+ (PR_PAC_APIAKEY | PR_PAC_APIBKEY | PR_PAC_APDAKEY | PR_PAC_APDBKEY)
+
#endif /* __ASM_POINTER_AUTH_H */