security: remove unused security_sysctl hook

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>
Signed-off-by: Eric Paris <eparis@redhat.com>

diff --git a/include/linux/security.h b/include/linux/security.h
index 05dd5a6..14167f2 100644 (file)
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -1259,12 +1259,6 @@ 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.
@@ -1385,7 +1379,6 @@ 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);
@@ -1668,7 +1661,6 @@ 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);
@@ -1887,11 +1879,6 @@ 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 ae5cbb1..e24254c 100644 (file)
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1691,13 +1691,8 @@ 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 383d14d..85b67c8 100644 (file)
--- 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;
@@ -881,7 +876,6 @@ 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 4830f36..8f28685 100644 (file)
--- 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);