[PATCH v18 1/4] printk: Move back proc_dointvec_minmax_sysadmin() to sysctl.c

[Mickaël Salaün <mic@xxxxxxxxxxx>]

From: Mickaël Salaün <mic@xxxxxxxxxxxxxxxxxxx>

The proc_dointvec_minmax_sysadmin() helper is useful for the
fs.trusted_for_policy sysctl brought by the next commit.

This partially revert commit 642fd23fb826 ("printk: move printk sysctl
to printk/sysctl.c") from Luis Chamberlain's 20211129-sysctl-cleanups
branch [1], to share the proc_dointvec_minmax_sysadmin() helper.  FYI,
this previous commit also got the buffer pointer an __user attribute.

Also remove the forgotten ten_thousand static variable (moved to
kernel/printk/sysctl.c).

Link: https://lkml.kernel.org/r/20211124231435.1445213-6-mcgrof@xxxxxxxxxx [1]
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Cc: Xiaoming Ni <nixiaoming@xxxxxxxxxx>
Signed-off-by: Mickaël Salaün <mic@xxxxxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220104155024.48023-2-mic@xxxxxxxxxxx
---
 include/linux/sysctl.h | 2 ++
 kernel/printk/sysctl.c | 9 ---------
 kernel/sysctl.c        | 9 +++++++++
 3 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 180adf7da785..cf1ba98aab50 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -69,6 +69,8 @@ int proc_dobool(struct ctl_table *table, int write, void *buffer,
 int proc_dointvec(struct ctl_table *, int, void *, size_t *, loff_t *);
 int proc_douintvec(struct ctl_table *, int, void *, size_t *, loff_t *);
 int proc_dointvec_minmax(struct ctl_table *, int, void *, size_t *, loff_t *);
+int proc_dointvec_minmax_sysadmin(struct ctl_table *, int, void *, size_t *,
+		loff_t *);
 int proc_douintvec_minmax(struct ctl_table *table, int write, void *buffer,
 		size_t *lenp, loff_t *ppos);
 int proc_dou8vec_minmax(struct ctl_table *table, int write, void *buffer,
diff --git a/kernel/printk/sysctl.c b/kernel/printk/sysctl.c
index 653ae04aab7f..c7129428ee9b 100644
--- a/kernel/printk/sysctl.c
+++ b/kernel/printk/sysctl.c
@@ -11,15 +11,6 @@
 
 static const int ten_thousand = 10000;
 
-static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
-				void __user *buffer, size_t *lenp, loff_t *ppos)
-{
-	if (write && !capable(CAP_SYS_ADMIN))
-		return -EPERM;
-
-	return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
-}
-
 static struct ctl_table printk_sysctls[] = {
 	{
 		.procname	= "printk",
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 5ae443b2882e..2e2027e323fd 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -888,6 +888,15 @@ static int proc_taint(struct ctl_table *table, int write,
 	return err;
 }
 
+int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
+				void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+	if (write && !capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
+	return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
+}
+
 /**
  * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
  * @min: pointer to minimum allowable value
-- 
2.34.1