/* SPDX-License-Identifier: GPL-2.0 */#ifndef LINUX_PID_SYSCTL_H#define LINUX_PID_SYSCTL_H #include <linux/pid_namespace.h> #if defined(CONFIG_SYSCTL) && defined(CONFIG_MEMFD_CREATE)static int pid_mfd_noexec_dointvec_minmax(const struct ctl_table *table,	int write, void *buf, size_t *lenp, loff_t *ppos){	struct pid_namespace *ns = task_active_pid_ns(current);	struct ctl_table table_copy;	int err, scope, parent_scope; 	if (write && !ns_capable(ns->user_ns, CAP_SYS_ADMIN))		return -EPERM; 	table_copy = *table; 	/* You cannot set a lower enforcement value than your parent. */	parent_scope = pidns_memfd_noexec_scope(ns->parent);	/* Equivalent to pidns_memfd_noexec_scope(ns). */	scope = max(READ_ONCE(ns->memfd_noexec_scope), parent_scope); 	table_copy.data = &scope;	table_copy.extra1 = &parent_scope; 	err = proc_dointvec_minmax(&table_copy, write, buf, lenp, ppos);	if (!err && write)		WRITE_ONCE(ns->memfd_noexec_scope, scope);	return err;} static const struct ctl_table pid_ns_ctl_table_vm[] = {	{		.procname	= "memfd_noexec",		.data		= &init_pid_ns.memfd_noexec_scope,		.maxlen		= sizeof(init_pid_ns.memfd_noexec_scope),		.mode		= 0644,		.proc_handler	= pid_mfd_noexec_dointvec_minmax,		.extra1		= SYSCTL_ZERO,		.extra2		= SYSCTL_TWO,	},};static inline void register_pid_ns_sysctl_table_vm(void){	register_sysctl("vm", pid_ns_ctl_table_vm);}#elsestatic inline void register_pid_ns_sysctl_table_vm(void) {}#endif #endif /* LINUX_PID_SYSCTL_H */