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Date: Wed, 27 Feb 2008 01:25:41 +0200
From: "Ahmed S. Darwish" <darwish.07@...il.com>
To: Chris Wright <chrisw@...s-sol.org>,
Stephen Smalley <sds@...ho.nsa.gov>,
James Morris <jmorris@...ei.org>,
Eric Paris <eparis@...isplace.org>,
Casey Schaufler <casey@...aufler-ca.com>,
David Woodhouse <dwmw2@...radead.org>
Cc: linux-security-module@...r.kernel.org,
LKML <linux-kernel@...r.kernel.org>,
akpm <akpm@...ux-foundation.org>
Subject: [PATCH -mm 2/4] SELinux: Remove various exported symbols
Remove the following exported SELinux interfaces:
selinux_get_inode_sid(inode, sid)
selinux_get_ipc_sid(ipcp, sid)
selinux_get_task_sid(tsk, sid)
selinux_sid_to_string(sid, ctx, len)
and substitue them with following equivalents respectively:
new LSM hook, inode_getsecid(inode, secid)
new LSM hook, ipc_getsecid*(ipcp, secid)
LSM hook, task_getsecid(tsk, secid)
LSM hook, sid_to_secctx(sid, ctx, len)
This is done to remove SELinux dependency from some
of the kernel subsystems (audit).
Signed-off-by: Casey Schaufler <casey@...aufler-ca.com>
Signed-off-by: Ahmed S. Darwish <darwish.07@...il.com>
---
include/linux/selinux.h | 62 ---------------------------------------------
security/selinux/exports.c | 42 ------------------------------
security/selinux/hooks.c | 19 ++++++++++++-
3 files changed, 17 insertions(+), 106 deletions(-)
diff --git a/include/linux/selinux.h b/include/linux/selinux.h
index 8c2cc4c..24b0af1 100644
--- a/include/linux/selinux.h
+++ b/include/linux/selinux.h
@@ -16,7 +16,6 @@
struct selinux_audit_rule;
struct audit_context;
-struct inode;
struct kern_ipc_perm;
#ifdef CONFIG_SECURITY_SELINUX
@@ -70,45 +69,6 @@ int selinux_audit_rule_match(u32 sid, u32 field, u32 op,
void selinux_audit_set_callback(int (*callback)(void));
/**
- * selinux_sid_to_string - map a security context ID to a string
- * @sid: security context ID to be converted.
- * @ctx: address of context string to be returned
- * @ctxlen: length of returned context string.
- *
- * Returns 0 if successful, -errno if not. On success, the context
- * string will be allocated internally, and the caller must call
- * kfree() on it after use.
- */
-int selinux_sid_to_string(u32 sid, char **ctx, u32 *ctxlen);
-
-/**
- * selinux_get_inode_sid - get the inode's security context ID
- * @inode: inode structure to get the sid from.
- * @sid: pointer to security context ID to be filled in.
- *
- * Returns nothing
- */
-void selinux_get_inode_sid(const struct inode *inode, u32 *sid);
-
-/**
- * selinux_get_ipc_sid - get the ipc security context ID
- * @ipcp: ipc structure to get the sid from.
- * @sid: pointer to security context ID to be filled in.
- *
- * Returns nothing
- */
-void selinux_get_ipc_sid(const struct kern_ipc_perm *ipcp, u32 *sid);
-
-/**
- * selinux_get_task_sid - return the SID of task
- * @tsk: the task whose SID will be returned
- * @sid: pointer to security context ID to be filled in.
- *
- * Returns nothing
- */
-void selinux_get_task_sid(struct task_struct *tsk, u32 *sid);
-
-/**
* selinux_string_to_sid - map a security context string to a security ID
* @str: the security context string to be mapped
* @sid: ID value returned via this.
@@ -175,28 +135,6 @@ static inline void selinux_audit_set_callback(int (*callback)(void))
return;
}
-static inline int selinux_sid_to_string(u32 sid, char **ctx, u32 *ctxlen)
-{
- *ctx = NULL;
- *ctxlen = 0;
- return 0;
-}
-
-static inline void selinux_get_inode_sid(const struct inode *inode, u32 *sid)
-{
- *sid = 0;
-}
-
-static inline void selinux_get_ipc_sid(const struct kern_ipc_perm *ipcp, u32 *sid)
-{
- *sid = 0;
-}
-
-static inline void selinux_get_task_sid(struct task_struct *tsk, u32 *sid)
-{
- *sid = 0;
-}
-
static inline int selinux_string_to_sid(const char *str, u32 *sid)
{
*sid = 0;
diff --git a/security/selinux/exports.c b/security/selinux/exports.c
index 87d2bb3..64af2d3 100644
--- a/security/selinux/exports.c
+++ b/security/selinux/exports.c
@@ -25,48 +25,6 @@
/* SECMARK reference count */
extern atomic_t selinux_secmark_refcount;
-int selinux_sid_to_string(u32 sid, char **ctx, u32 *ctxlen)
-{
- if (selinux_enabled)
- return security_sid_to_context(sid, ctx, ctxlen);
- else {
- *ctx = NULL;
- *ctxlen = 0;
- }
-
- return 0;
-}
-
-void selinux_get_inode_sid(const struct inode *inode, u32 *sid)
-{
- if (selinux_enabled) {
- struct inode_security_struct *isec = inode->i_security;
- *sid = isec->sid;
- return;
- }
- *sid = 0;
-}
-
-void selinux_get_ipc_sid(const struct kern_ipc_perm *ipcp, u32 *sid)
-{
- if (selinux_enabled) {
- struct ipc_security_struct *isec = ipcp->security;
- *sid = isec->sid;
- return;
- }
- *sid = 0;
-}
-
-void selinux_get_task_sid(struct task_struct *tsk, u32 *sid)
-{
- if (selinux_enabled) {
- struct task_security_struct *tsec = tsk->security;
- *sid = tsec->sid;
- return;
- }
- *sid = 0;
-}
-
int selinux_string_to_sid(char *str, u32 *sid)
{
if (selinux_enabled)
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index f42ebfc..62a0f26 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2724,6 +2724,12 @@ static int selinux_inode_killpriv(struct dentry *dentry)
return secondary_ops->inode_killpriv(dentry);
}
+static void selinux_inode_getsecid(const struct inode *inode, u32 *secid)
+{
+ struct inode_security_struct *isec = inode->i_security;
+ *secid = isec->sid;
+}
+
/* file security operations */
static int selinux_revalidate_file_permission(struct file *file, int mask)
@@ -3120,7 +3126,8 @@ static int selinux_task_getsid(struct task_struct *p)
static void selinux_task_getsecid(struct task_struct *p, u32 *secid)
{
- selinux_get_task_sid(p, secid);
+ struct task_security_struct *tsec = p->security;
+ *secid = tsec->sid;
}
static int selinux_task_setgroups(struct group_info *group_info)
@@ -4090,7 +4097,7 @@ static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *
goto out;
if (sock && family == PF_UNIX)
- selinux_get_inode_sid(SOCK_INODE(sock), &peer_secid);
+ selinux_inode_getsecid(SOCK_INODE(sock), &peer_secid);
else if (skb)
selinux_skb_peerlbl_sid(skb, family, &peer_secid);
@@ -4970,6 +4977,12 @@ static int selinux_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
return ipc_has_perm(ipcp, av);
}
+static void selinux_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
+{
+ struct ipc_security_struct *isec = ipcp->security;
+ *secid = isec->sid;
+}
+
/* module stacking operations */
static int selinux_register_security (const char *name, struct security_operations *ops)
{
@@ -5292,6 +5305,7 @@ static struct security_operations selinux_ops = {
.inode_listsecurity = selinux_inode_listsecurity,
.inode_need_killpriv = selinux_inode_need_killpriv,
.inode_killpriv = selinux_inode_killpriv,
+ .inode_getsecid = selinux_inode_getsecid,
.file_permission = selinux_file_permission,
.file_alloc_security = selinux_file_alloc_security,
@@ -5332,6 +5346,7 @@ static struct security_operations selinux_ops = {
.task_to_inode = selinux_task_to_inode,
.ipc_permission = selinux_ipc_permission,
+ .ipc_getsecid = selinux_ipc_getsecid,
.msg_msg_alloc_security = selinux_msg_msg_alloc_security,
.msg_msg_free_security = selinux_msg_msg_free_security,
--
"Better to light a candle, than curse the darkness"
Ahmed S. Darwish
Homepage: http://darwish.07.googlepages.com
Blog: http://darwish-07.blogspot.com
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