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SubjectRe: [PATCH 2/2] security: remove unused security_sysctl hook
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On Feb 1, 2011, at 2:05 PM, Stephen Smalley <sds@tycho.nsa.gov> wrote:

> On Tue, 2011-02-01 at 18:44 +0200, Lucian Adrian Grijincu wrote:
>> 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>
>
> Acked-by: Stephen Smalley <sds@tycho.nsa.gov>

I've applied both to the selinux tree. Thanks

-Eric
>
>> ---
>> 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
>
> --
> Stephen Smalley
> National Security Agency
>


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