This is a note to let you know that I've just added the patch titled
sysctl: use const for typically used max/min proc sysctls
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sysctl-use-const-for-typically-used-max-min-proc-sys.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 2f261be58124e5da5a0f67b87ac2efe0d9d77acf
Author: Xiaoming Ni <nixiaoming@xxxxxxxxxx>
Date: Fri Jan 21 22:11:14 2022 -0800
sysctl: use const for typically used max/min proc sysctls
[ Upstream commit d73840ec2f747b860331bbba53677d0ce38fb9c1 ]
When proc_dointvec_minmax() or proc_doulongvec_minmax() are used we are
using the extra1 and extra2 parameters on the sysctl table only for a
min and max boundary, these extra1 and extra2 arguments are then used
for read-only operations. So make them const to reflect this.
[mcgrof@xxxxxxxxxx: commit log love]
Link: https://lkml.kernel.org/r/20211123202347.818157-7-mcgrof@xxxxxxxxxx
Signed-off-by: Xiaoming Ni <nixiaoming@xxxxxxxxxx>
Signed-off-by: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Amir Goldstein <amir73il@xxxxxxxxx>
Cc: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: Benjamin LaHaise <bcrl@xxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Iurii Zaikin <yzaikin@xxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Paul Turner <pjt@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Petr Mladek <pmladek@xxxxxxxx>
Cc: Qing Wang <wangqing@xxxxxxxx>
Cc: Sebastian Reichel <sre@xxxxxxxxxx>
Cc: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Cc: Stephen Kitt <steve@xxxxxxx>
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Cc: Antti Palosaari <crope@xxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Clemens Ladisch <clemens@xxxxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
Cc: Joel Becker <jlbec@xxxxxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Cc: Joseph Qi <joseph.qi@xxxxxxxxxxxxxxxxx>
Cc: Julia Lawall <julia.lawall@xxxxxxxx>
Cc: Lukas Middendorf <kernel@xxxxxxxxxxx>
Cc: Mark Fasheh <mark@xxxxxxxxxx>
Cc: Phillip Potter <phil@xxxxxxxxxxxxxxxx>
Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Cc: Douglas Gilbert <dgilbert@xxxxxxxxxxxx>
Cc: James E.J. Bottomley <jejb@xxxxxxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Cc: John Ogness <john.ogness@xxxxxxxxxxxxx>
Cc: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>
Cc: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
Cc: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Cc: "Theodore Ts'o" <tytso@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Stable-dep-of: d727935cad9f ("fs: fix proc_handler for sysctl_nr_open")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 0a84cb7a8bffe..48eb4e7b72dea 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -113,27 +113,26 @@
static int sixty = 60;
#endif
-static unsigned long zero_ul;
-static unsigned long one_ul = 1;
-static unsigned long long_max = LONG_MAX;
+static const unsigned long zero_ul;
+static const unsigned long one_ul = 1;
+static const unsigned long long_max = LONG_MAX;
#ifdef CONFIG_PRINTK
-static int ten_thousand = 10000;
+static const int ten_thousand = 10000;
#endif
#ifdef CONFIG_PERF_EVENTS
-static int six_hundred_forty_kb = 640 * 1024;
+static const int six_hundred_forty_kb = 640 * 1024;
#endif
/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
-static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
+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 int maxolduid = 65535;
-static int minolduid;
+static const int maxolduid = 65535;
+static const int minolduid;
static int ngroups_max = NGROUPS_MAX;
static const int cap_last_cap = CAP_LAST_CAP;
-
#ifdef CONFIG_INOTIFY_USER
#include <linux/inotify.h>
#endif
@@ -177,8 +176,8 @@ int sysctl_legacy_va_layout;
#endif
#ifdef CONFIG_COMPACTION
-static int min_extfrag_threshold;
-static int max_extfrag_threshold = 1000;
+static const int min_extfrag_threshold;
+static const int max_extfrag_threshold = 1000;
#endif
#endif /* CONFIG_SYSCTL */
@@ -2196,8 +2195,8 @@ static struct ctl_table kern_table[] = {
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
- .extra1 = &minolduid,
- .extra2 = &maxolduid,
+ .extra1 = (void *)&minolduid,
+ .extra2 = (void *)&maxolduid,
},
{
.procname = "overflowgid",
@@ -2205,8 +2204,8 @@ static struct ctl_table kern_table[] = {
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
- .extra1 = &minolduid,
- .extra2 = &maxolduid,
+ .extra1 = (void *)&minolduid,
+ .extra2 = (void *)&maxolduid,
},
#ifdef CONFIG_S390
{
@@ -2269,7 +2268,7 @@ static struct ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
- .extra2 = &ten_thousand,
+ .extra2 = (void *)&ten_thousand,
},
{
.procname = "printk_devkmsg",
@@ -2571,7 +2570,7 @@ static struct ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = perf_event_max_stack_handler,
.extra1 = SYSCTL_ZERO,
- .extra2 = &six_hundred_forty_kb,
+ .extra2 = (void *)&six_hundred_forty_kb,
},
{
.procname = "perf_event_max_contexts_per_stack",
@@ -2727,7 +2726,7 @@ static struct ctl_table vm_table[] = {
.maxlen = sizeof(dirty_background_bytes),
.mode = 0644,
.proc_handler = dirty_background_bytes_handler,
- .extra1 = &one_ul,
+ .extra1 = (void *)&one_ul,
},
{
.procname = "dirty_ratio",
@@ -2744,7 +2743,7 @@ static struct ctl_table vm_table[] = {
.maxlen = sizeof(vm_dirty_bytes),
.mode = 0644,
.proc_handler = dirty_bytes_handler,
- .extra1 = &dirty_bytes_min,
+ .extra1 = (void *)&dirty_bytes_min,
},
{
.procname = "dirty_writeback_centisecs",
@@ -2860,8 +2859,8 @@ static struct ctl_table vm_table[] = {
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
- .extra1 = &min_extfrag_threshold,
- .extra2 = &max_extfrag_threshold,
+ .extra1 = (void *)&min_extfrag_threshold,
+ .extra2 = (void *)&max_extfrag_threshold,
},
{
.procname = "compact_unevictable_allowed",
@@ -3147,8 +3146,8 @@ static struct ctl_table fs_table[] = {
.maxlen = sizeof(files_stat.max_files),
.mode = 0644,
.proc_handler = proc_doulongvec_minmax,
- .extra1 = &zero_ul,
- .extra2 = &long_max,
+ .extra1 = (void *)&zero_ul,
+ .extra2 = (void *)&long_max,
},
{
.procname = "nr_open",
@@ -3172,8 +3171,8 @@ static struct ctl_table fs_table[] = {
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
- .extra1 = &minolduid,
- .extra2 = &maxolduid,
+ .extra1 = (void *)&minolduid,
+ .extra2 = (void *)&maxolduid,
},
{
.procname = "overflowgid",
@@ -3181,8 +3180,8 @@ static struct ctl_table fs_table[] = {
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
- .extra1 = &minolduid,
- .extra2 = &maxolduid,
+ .extra1 = (void *)&minolduid,
+ .extra2 = (void *)&maxolduid,
},
#ifdef CONFIG_FILE_LOCKING
{
