60 строки
1.6 KiB
C
60 строки
1.6 KiB
C
/* 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 inline void initialize_memfd_noexec_scope(struct pid_namespace *ns)
|
|
{
|
|
ns->memfd_noexec_scope =
|
|
task_active_pid_ns(current)->memfd_noexec_scope;
|
|
}
|
|
|
|
static int pid_mfd_noexec_dointvec_minmax(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;
|
|
|
|
if (write && !ns_capable(ns->user_ns, CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
table_copy = *table;
|
|
if (ns != &init_pid_ns)
|
|
table_copy.data = &ns->memfd_noexec_scope;
|
|
|
|
/*
|
|
* set minimum to current value, the effect is only bigger
|
|
* value is accepted.
|
|
*/
|
|
if (*(int *)table_copy.data > *(int *)table_copy.extra1)
|
|
table_copy.extra1 = table_copy.data;
|
|
|
|
return proc_dointvec_minmax(&table_copy, write, buf, lenp, ppos);
|
|
}
|
|
|
|
static 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);
|
|
}
|
|
#else
|
|
static inline void initialize_memfd_noexec_scope(struct pid_namespace *ns) {}
|
|
static inline void set_memfd_noexec_scope(struct pid_namespace *ns) {}
|
|
static inline void register_pid_ns_sysctl_table_vm(void) {}
|
|
#endif
|
|
|
|
#endif /* LINUX_PID_SYSCTL_H */
|