projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 105ff533 JX |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef LINUX_PID_SYSCTL_H | |
| 3 | #define LINUX_PID_SYSCTL_H | |
| 4 | ||
| 5 | #include <linux/pid_namespace.h> | |
| 6 | ||
| 7 | #if defined(CONFIG_SYSCTL) && defined(CONFIG_MEMFD_CREATE) | |
| 8 | static inline void initialize_memfd_noexec_scope(struct pid_namespace *ns) | |
| 9 | { | |
| 10 | ns->memfd_noexec_scope = | |
| 11 | task_active_pid_ns(current)->memfd_noexec_scope; | |
| 12 | } | |
| 13 | ||
| 14 | static int pid_mfd_noexec_dointvec_minmax(struct ctl_table *table, | |
| 15 | int write, void *buf, size_t *lenp, loff_t *ppos) | |
| 16 | { | |
| 17 | struct pid_namespace *ns = task_active_pid_ns(current); | |
| 18 | struct ctl_table table_copy; | |
| 19 | ||
| 20 | if (write && !ns_capable(ns->user_ns, CAP_SYS_ADMIN)) | |
| 21 | return -EPERM; | |
| 22 | ||
| 23 | table_copy = *table; | |
| 24 | if (ns != &init_pid_ns) | |
| 25 | table_copy.data = &ns->memfd_noexec_scope; | |
| 26 | ||
| 27 | /* | |
| 28 | * set minimum to current value, the effect is only bigger | |
| 29 | * value is accepted. | |
| 30 | */ | |
| 31 | if (*(int *)table_copy.data > *(int *)table_copy.extra1) | |
| 32 | table_copy.extra1 = table_copy.data; | |
| 33 | ||
| 34 | return proc_dointvec_minmax(&table_copy, write, buf, lenp, ppos); | |
| 35 | } | |
| 36 | ||
| 37 | static struct ctl_table pid_ns_ctl_table_vm[] = { | |
| 38 | { | |
| 39 | .procname = "memfd_noexec", | |
| 40 | .data = &init_pid_ns.memfd_noexec_scope, | |
| 41 | .maxlen = sizeof(init_pid_ns.memfd_noexec_scope), | |
| 42 | .mode = 0644, | |
| 43 | .proc_handler = pid_mfd_noexec_dointvec_minmax, | |
| 44 | .extra1 = SYSCTL_ZERO, | |
| 45 | .extra2 = SYSCTL_TWO, | |
| 46 | }, | |
| 47 | { } | |
| 48 | }; | |
| 49 | static struct ctl_path vm_path[] = { { .procname = "vm", }, { } }; | |
| 50 | static inline void register_pid_ns_sysctl_table_vm(void) | |
| 51 | { | |
| 52 | register_sysctl_paths(vm_path, pid_ns_ctl_table_vm); | |
| 53 | } | |
| 54 | #else | |
| 55 | static inline void initialize_memfd_noexec_scope(struct pid_namespace *ns) {} | |
| 56 | static inline void set_memfd_noexec_scope(struct pid_namespace *ns) {} | |
| 57 | static inline void register_pid_ns_sysctl_table_vm(void) {} | |
| 58 | #endif | |
| 59 | ||
| 60 | #endif /* LINUX_PID_SYSCTL_H */ |