linux-kernel - Re: [PATCH 2/2] security: remove unused security

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Date:	Tue, 1 Feb 2011 15:06:35 -0500 (EST)
From:	Eric Paris <eparis@...hat.com>
To:	Stephen Smalley <sds@...ho.nsa.gov>
Cc:	Lucian Adrian Grijincu <lucian.grijincu@...il.com>,
	James Morris <jmorris@...ei.org>,
	"ebiederm@...ssion.com" <ebiederm@...ssion.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-security-module@...r.kernel.org" 
	<linux-security-module@...r.kernel.org>
Subject: Re: [PATCH 2/2] security: remove unused security_sysctl hook





On Feb 1, 2011, at 2:05 PM, Stephen Smalley <sds@...ho.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@...il.com>
> 
> Acked-by:  Stephen Smalley <sds@...ho.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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