diff options
Diffstat (limited to 'kernel/utsname_sysctl.c')
| -rw-r--r-- | kernel/utsname_sysctl.c | 38 |
1 files changed, 17 insertions, 21 deletions
diff --git a/kernel/utsname_sysctl.c b/kernel/utsname_sysctl.c index 258033d62cb3..bfbaaecb1dd4 100644 --- a/kernel/utsname_sysctl.c +++ b/kernel/utsname_sysctl.c @@ -1,24 +1,21 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2007 * * Author: Eric Biederman <ebiederm@xmision.com> - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation, version 2 of the - * License. */ #include <linux/export.h> #include <linux/uts.h> #include <linux/utsname.h> +#include <linux/random.h> #include <linux/sysctl.h> #include <linux/wait.h> #include <linux/rwsem.h> #ifdef CONFIG_PROC_SYSCTL -static void *get_uts(struct ctl_table *table) +static void *get_uts(const struct ctl_table *table) { char *which = table->data; struct uts_namespace *uts_ns; @@ -33,8 +30,8 @@ static void *get_uts(struct ctl_table *table) * Special case of dostring for the UTS structure. This has locks * to observe. Should this be in kernel/sys.c ???? */ -static int proc_do_uts_string(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos) +static int proc_do_uts_string(const struct ctl_table *table, int write, + void *buffer, size_t *lenp, loff_t *ppos) { struct ctl_table uts_table; int r; @@ -61,6 +58,7 @@ static int proc_do_uts_string(struct ctl_table *table, int write, * theoretically be incorrect if there are two parallel writes * at non-zero offsets to the same sysctl. */ + add_device_randomness(tmp_data, sizeof(tmp_data)); down_write(&uts_sem); memcpy(get_uts(table), tmp_data, sizeof(tmp_data)); up_write(&uts_sem); @@ -76,7 +74,15 @@ static int proc_do_uts_string(struct ctl_table *table, int write, static DEFINE_CTL_TABLE_POLL(hostname_poll); static DEFINE_CTL_TABLE_POLL(domainname_poll); -static struct ctl_table uts_kern_table[] = { +// Note: update 'enum uts_proc' to match any changes to this table +static const struct ctl_table uts_kern_table[] = { + { + .procname = "arch", + .data = init_uts_ns.name.machine, + .maxlen = sizeof(init_uts_ns.name.machine), + .mode = 0444, + .proc_handler = proc_do_uts_string, + }, { .procname = "ostype", .data = init_uts_ns.name.sysname, @@ -114,16 +120,6 @@ static struct ctl_table uts_kern_table[] = { .proc_handler = proc_do_uts_string, .poll = &domainname_poll, }, - {} -}; - -static struct ctl_table uts_root_table[] = { - { - .procname = "kernel", - .mode = 0555, - .child = uts_kern_table, - }, - {} }; #ifdef CONFIG_PROC_SYSCTL @@ -133,7 +129,7 @@ static struct ctl_table uts_root_table[] = { */ void uts_proc_notify(enum uts_proc proc) { - struct ctl_table *table = &uts_kern_table[proc]; + const struct ctl_table *table = &uts_kern_table[proc]; proc_sys_poll_notify(table->poll); } @@ -141,7 +137,7 @@ void uts_proc_notify(enum uts_proc proc) static int __init utsname_sysctl_init(void) { - register_sysctl_table(uts_root_table); + register_sysctl("kernel", uts_kern_table); return 0; } |