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Subject[PATCH 2/2] security: remove unused security_sysctl hook
Date
The only user for this hook was selinux. sysctl routes every call
through /proc/sys/. Selinux and other security modules use the file
system checks for sysctl too, so no need for this hook any more.

Signed-off-by: Lucian Adrian Grijincu <lucian.grijincu@gmail.com>
---
include/linux/security.h | 13 -------------
kernel/sysctl.c | 5 -----
security/capability.c | 6 ------
security/security.c | 5 -----
4 files changed, 0 insertions(+), 29 deletions(-)

diff --git a/include/linux/security.h b/include/linux/security.h
index c642bb8..e7b48dc 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -1257,12 +1257,6 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
* @cap contains the capability <include/linux/capability.h>.
* @audit: Whether to write an audit message or not
* Return 0 if the capability is granted for @tsk.
- * @sysctl:
- * Check permission before accessing the @table sysctl variable in the
- * manner specified by @op.
- * @table contains the ctl_table structure for the sysctl variable.
- * @op contains the operation (001 = search, 002 = write, 004 = read).
- * Return 0 if permission is granted.
* @syslog:
* Check permission before accessing the kernel message ring or changing
* logging to the console.
@@ -1383,7 +1377,6 @@ struct security_operations {
const kernel_cap_t *permitted);
int (*capable) (struct task_struct *tsk, const struct cred *cred,
int cap, int audit);
- int (*sysctl) (struct ctl_table *table, int op);
int (*quotactl) (int cmds, int type, int id, struct super_block *sb);
int (*quota_on) (struct dentry *dentry);
int (*syslog) (int type);
@@ -1665,7 +1658,6 @@ int security_capset(struct cred *new, const struct cred *old,
int security_capable(int cap);
int security_real_capable(struct task_struct *tsk, int cap);
int security_real_capable_noaudit(struct task_struct *tsk, int cap);
-int security_sysctl(struct ctl_table *table, int op);
int security_quotactl(int cmds, int type, int id, struct super_block *sb);
int security_quota_on(struct dentry *dentry);
int security_syslog(int type);
@@ -1883,11 +1875,6 @@ int security_real_capable_noaudit(struct task_struct *tsk, int cap)
return ret;
}

-static inline int security_sysctl(struct ctl_table *table, int op)
-{
- return 0;
-}
-
static inline int security_quotactl(int cmds, int type, int id,
struct super_block *sb)
{
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 0f1bd83..56f6fc1 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1685,13 +1685,8 @@ static int test_perm(int mode, int op)

int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
{
- int error;
int mode;

- error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
- if (error)
- return error;
-
if (root->permissions)
mode = root->permissions(root, current->nsproxy, table);
else
diff --git a/security/capability.c b/security/capability.c
index 2a5df2b..ebe3b5d 100644
--- a/security/capability.c
+++ b/security/capability.c
@@ -12,11 +12,6 @@

#include <linux/security.h>

-static int cap_sysctl(ctl_table *table, int op)
-{
- return 0;
-}
-
static int cap_syslog(int type)
{
return 0;
@@ -880,7 +875,6 @@ void __init security_fixup_ops(struct security_operations *ops)
set_to_cap_if_null(ops, capable);
set_to_cap_if_null(ops, quotactl);
set_to_cap_if_null(ops, quota_on);
- set_to_cap_if_null(ops, sysctl);
set_to_cap_if_null(ops, syslog);
set_to_cap_if_null(ops, settime);
set_to_cap_if_null(ops, vm_enough_memory);
diff --git a/security/security.c b/security/security.c
index 739e403..53d793a 100644
--- a/security/security.c
+++ b/security/security.c
@@ -182,11 +182,6 @@ int security_real_capable_noaudit(struct task_struct *tsk, int cap)
return ret;
}

-int security_sysctl(struct ctl_table *table, int op)
-{
- return security_ops->sysctl(table, op);
-}
-
int security_quotactl(int cmds, int type, int id, struct super_block *sb)
{
return security_ops->quotactl(cmds, type, id, sb);
--
1.7.4.rc1.7.g2cf08.dirty


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