// SPDX-License-Identifier: GPL-2.0 #include <linux/errno.h>#include <linux/prctl.h>#include <linux/random.h>#include <linux/sched.h>#include <asm/cpufeature.h>#include <asm/pointer_auth.h> int ptrauth_prctl_reset_keys(struct task_struct *tsk, unsigned long arg){	struct ptrauth_keys_user *keys = &tsk->thread.keys_user;	unsigned long addr_key_mask = PR_PAC_APIAKEY | PR_PAC_APIBKEY |				      PR_PAC_APDAKEY | PR_PAC_APDBKEY;	unsigned long key_mask = addr_key_mask | PR_PAC_APGAKEY; 	if (!system_supports_address_auth() && !system_supports_generic_auth())		return -EINVAL; 	if (!arg) {		ptrauth_keys_init_user(keys);		return 0;	} 	if (arg & ~key_mask)		return -EINVAL; 	if (((arg & addr_key_mask) && !system_supports_address_auth()) ||	    ((arg & PR_PAC_APGAKEY) && !system_supports_generic_auth()))		return -EINVAL; 	if (arg & PR_PAC_APIAKEY)		get_random_bytes(&keys->apia, sizeof(keys->apia));	if (arg & PR_PAC_APIBKEY)		get_random_bytes(&keys->apib, sizeof(keys->apib));	if (arg & PR_PAC_APDAKEY)		get_random_bytes(&keys->apda, sizeof(keys->apda));	if (arg & PR_PAC_APDBKEY)		get_random_bytes(&keys->apdb, sizeof(keys->apdb));	if (arg & PR_PAC_APGAKEY)		get_random_bytes(&keys->apga, sizeof(keys->apga)); 	return 0;}