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sysctl: move maxolduid as a sysctl specific const 

The maxolduid value is only shared for sysctl purposes for use on a max
range.  Just stuff this into our shared const array.

[akpm@linux-foundation.org: fix sysctl_vals[], per Mickaël]

Link: https://lkml.kernel.org/r/20211129205548.605569-5-mcgrof@kernel.org
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Mickaël Salaün <mic@digikod.net>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Luis Chamberlain 2022-01-21 22:13:03 -08:00 committed by Linus Torvalds
parent c8c0c239d5
commit 54771613e8
3 changed files with 8 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/proc/proc_sysctl.c
View File

@ -26,7 +26,7 @@ static const struct file_operations proc_sys_dir_file_operations;
static const struct inode_operations proc_sys_dir_operations;
/* shared constants to be used in various sysctls */
const int sysctl_vals[] = { -1, 0, 1, 2, 4, 100, 200, 1000, 3000, INT_MAX };
const int sysctl_vals[] = { -1, 0, 1, 2, 4, 100, 200, 1000, 3000, INT_MAX, 65535 };
EXPORT_SYMBOL(sysctl_vals);
const unsigned long sysctl_long_vals[] = { 0, 1, LONG_MAX };

3
include/linux/sysctl.h
View File

@ -49,6 +49,9 @@ struct ctl_dir;
#define SYSCTL_THREE_THOUSAND ((void *)&sysctl_vals[8])
#define SYSCTL_INT_MAX ((void *)&sysctl_vals[9])
/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
#define SYSCTL_MAXOLDUID ((void *)&sysctl_vals[10])
extern const int sysctl_vals[];
#define SYSCTL_LONG_ZERO ((void *)&sysctl_long_vals[0])

12
kernel/sysctl.c
View File

@ -110,10 +110,6 @@ static const int six_hundred_forty_kb = 640 * 1024;
/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
static const unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
static const int maxolduid = 65535;
/* minolduid is SYSCTL_ZERO */
static const int ngroups_max = NGROUPS_MAX;
static const int cap_last_cap = CAP_LAST_CAP;
@ -2127,7 +2123,7 @@ static struct ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = (void *)&maxolduid,
.extra2 = SYSCTL_MAXOLDUID,
},
{
.procname = "overflowgid",
@ -2136,7 +2132,7 @@ static struct ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = (void *)&maxolduid,
.extra2 = SYSCTL_MAXOLDUID,
},
#ifdef CONFIG_S390
{
@ -2908,7 +2904,7 @@ static struct ctl_table fs_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = (void *)&maxolduid,
.extra2 = SYSCTL_MAXOLDUID,
},
{
.procname = "overflowgid",
@ -2917,7 +2913,7 @@ static struct ctl_table fs_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = (void *)&maxolduid,
.extra2 = SYSCTL_MAXOLDUID,
},
#ifdef CONFIG_FILE_LOCKING
{