linux-kernel - [PATCH 4/9] sysctl: move maxolduid as a sysctl specific const

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Date:   Mon, 29 Nov 2021 12:55:43 -0800
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     akpm@...ux-foundation.org, viro@...iv.linux.org.uk,
        keescook@...omium.org, yzaikin@...gle.com, nixiaoming@...wei.com,
        ebiederm@...ssion.com, steve@....org,
        mcgrof@...badil.infradead.org, mcgrof@...nel.org,
        andriy.shevchenko@...ux.intel.com, jlayton@...nel.org,
        bfields@...ldses.org
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 4/9] 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.

Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
---
 fs/proc/proc_sysctl.c  |  2 +-
 include/linux/sysctl.h |  3 +++
 kernel/sysctl.c        | 12 ++++--------
 3 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index 7dec3d5a9ed4..675b625fa898 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -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, 65535, INT_MAX };
 EXPORT_SYMBOL(sysctl_vals);
 
 const unsigned long sysctl_long_vals[] = { 0, 1, LONG_MAX };
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 2de6d20d191b..bb921eb8a02d 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -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])
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index dbd267d0f014..05d9dd85e17f 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -109,10 +109,6 @@ 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;
 
@@ -2126,7 +2122,7 @@ static struct ctl_table kern_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_minmax,
 		.extra1		= SYSCTL_ZERO,
-		.extra2		= (void *)&maxolduid,
+		.extra2		= SYSCTL_MAXOLDUID,
 	},
 	{
 		.procname	= "overflowgid",
@@ -2135,7 +2131,7 @@ 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
 	{
@@ -2907,7 +2903,7 @@ static struct ctl_table fs_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_minmax,
 		.extra1		= SYSCTL_ZERO,
-		.extra2		= (void *)&maxolduid,
+		.extra2		= SYSCTL_MAXOLDUID,
 	},
 	{
 		.procname	= "overflowgid",
@@ -2916,7 +2912,7 @@ 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
 	{
-- 
2.33.0