Merge branch 'for-linus' of git://selinuxproject.org/~jmorris/linux-security

* 'for-linus' of git://selinuxproject.org/~jmorris/linux-security:
  capabilities: remove __cap_full_set definition
  security: remove the security_netlink_recv hook as it is equivalent to capable()
  ptrace: do not audit capability check when outputing /proc/pid/stat
  capabilities: remove task_ns_* functions
  capabitlies: ns_capable can use the cap helpers rather than lsm call
  capabilities: style only - move capable below ns_capable
  capabilites: introduce new has_ns_capabilities_noaudit
  capabilities: call has_ns_capability from has_capability
  capabilities: remove all _real_ interfaces
  capabilities: introduce security_capable_noaudit
  capabilities: reverse arguments to security_capable
  capabilities: remove the task from capable LSM hook entirely
  selinux: sparse fix: fix several warnings in the security server cod
  selinux: sparse fix: fix warnings in netlink code
  selinux: sparse fix: eliminate warnings for selinuxfs
  selinux: sparse fix: declare selinux_disable() in security.h
  selinux: sparse fix: move selinux_complete_init
  selinux: sparse fix: make selinux_secmark_refcount static
  SELinux: Fix RCU deref check warning in sel_netport_insert()

Manually fix up a semantic mis-merge wrt security_netlink_recv():

 - the interface was removed in commit fd7784615248 ("security: remove
   the security_netlink_recv hook as it is equivalent to capable()")

 - a new user of it appeared in commit a38f7907b926 ("crypto: Add
   userspace configuration API")

causing no automatic merge conflict, but Eric Paris pointed out the
issue.

5 files changed, 27 insertions, 85 deletions

diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index 68d50c5..97ce8fa 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -136,16 +136,16 @@ static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective,
 	return 0;
 }
 
-static int apparmor_capable(struct task_struct *task, const struct cred *cred,
-			    struct user_namespace *ns, int cap, int audit)
+static int apparmor_capable(const struct cred *cred, struct user_namespace *ns,
+			    int cap, int audit)
 {
 	struct aa_profile *profile;
 	/* cap_capable returns 0 on success, else -EPERM */
-	int error = cap_capable(task, cred, ns, cap, audit);
+	int error = cap_capable(cred, ns, cap, audit);
 	if (!error) {
 		profile = aa_cred_profile(cred);
 		if (!unconfined(profile))
-			error = aa_capable(task, profile, cap, audit);
+			error = aa_capable(current, profile, cap, audit);
 	}
 	return error;
 }
diff --git a/security/capability.c b/security/capability.c
index 3b5883b..2f680eb 100644
--- a/security/capability.c
+++ b/security/capability.c
@@ -998,7 +998,6 @@ void __init security_fixup_ops(struct security_operations *ops)
 	set_to_cap_if_null(ops, sem_semctl);
 	set_to_cap_if_null(ops, sem_semop);
 	set_to_cap_if_null(ops, netlink_send);
-	set_to_cap_if_null(ops, netlink_recv);
 	set_to_cap_if_null(ops, d_instantiate);
 	set_to_cap_if_null(ops, getprocattr);
 	set_to_cap_if_null(ops, setprocattr);
diff --git a/security/commoncap.c b/security/commoncap.c
index ee4f848..7ce191e 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -56,17 +56,8 @@ int cap_netlink_send(struct sock *sk, struct sk_buff *skb)
 	return 0;
 }
 
-int cap_netlink_recv(struct sk_buff *skb, int cap)
-{
-	if (!cap_raised(current_cap(), cap))
-		return -EPERM;
-	return 0;
-}
-EXPORT_SYMBOL(cap_netlink_recv);
-
 /**
  * cap_capable - Determine whether a task has a particular effective capability
- * @tsk: The task to query
  * @cred: The credentials to use
  * @ns:  The user namespace in which we need the capability
  * @cap: The capability to check for
@@ -80,8 +71,8 @@ EXPORT_SYMBOL(cap_netlink_recv);
  * cap_has_capability() returns 0 when a task has a capability, but the
  * kernel's capable() and has_capability() returns 1 for this case.
  */
-int cap_capable(struct task_struct *tsk, const struct cred *cred,
-		struct user_namespace *targ_ns, int cap, int audit)
+int cap_capable(const struct cred *cred, struct user_namespace *targ_ns,
+		int cap, int audit)
 {
 	for (;;) {
 		/* The creator of the user namespace has all caps. */
@@ -222,9 +213,8 @@ static inline int cap_inh_is_capped(void)
 	/* they are so limited unless the current task has the CAP_SETPCAP
 	 * capability
 	 */
-	if (cap_capable(current, current_cred(),
-			current_cred()->user->user_ns, CAP_SETPCAP,
-			SECURITY_CAP_AUDIT) == 0)
+	if (cap_capable(current_cred(), current_cred()->user->user_ns,
+			CAP_SETPCAP, SECURITY_CAP_AUDIT) == 0)
 		return 0;
 	return 1;
 }
@@ -874,7 +864,7 @@ int cap_task_prctl(int option, unsigned long arg2, unsigned long arg3,
 		     & (new->securebits ^ arg2))			/*[1]*/
 		    || ((new->securebits & SECURE_ALL_LOCKS & ~arg2))	/*[2]*/
 		    || (arg2 & ~(SECURE_ALL_LOCKS | SECURE_ALL_BITS))	/*[3]*/
-		    || (cap_capable(current, current_cred(),
+		    || (cap_capable(current_cred(),
 				    current_cred()->user->user_ns, CAP_SETPCAP,
 				    SECURITY_CAP_AUDIT) != 0)		/*[4]*/
 			/*
@@ -940,7 +930,7 @@ int cap_vm_enough_memory(struct mm_struct *mm, long pages)
 {
 	int cap_sys_admin = 0;
 
-	if (cap_capable(current, current_cred(), &init_user_ns, CAP_SYS_ADMIN,
+	if (cap_capable(current_cred(), &init_user_ns, CAP_SYS_ADMIN,
 			SECURITY_CAP_NOAUDIT) == 0)
 		cap_sys_admin = 1;
 	return __vm_enough_memory(mm, pages, cap_sys_admin);
@@ -967,7 +957,7 @@ int cap_file_mmap(struct file *file, unsigned long reqprot,
 	int ret = 0;
 
 	if (addr < dac_mmap_min_addr) {
-		ret = cap_capable(current, current_cred(), &init_user_ns, CAP_SYS_RAWIO,
+		ret = cap_capable(current_cred(), &init_user_ns, CAP_SYS_RAWIO,
 				  SECURITY_CAP_AUDIT);
 		/* set PF_SUPERPRIV if it turns out we allow the low mmap */
 		if (ret == 0)
diff --git a/security/security.c b/security/security.c
index 214502c..d754249 100644
--- a/security/security.c
+++ b/security/security.c
@@ -155,35 +155,16 @@ int security_capset(struct cred *new, const struct cred *old,
 				    effective, inheritable, permitted);
 }
 
-int security_capable(struct user_namespace *ns, const struct cred *cred,
+int security_capable(const struct cred *cred, struct user_namespace *ns,
 		     int cap)
 {
-	return security_ops->capable(current, cred, ns, cap,
-				     SECURITY_CAP_AUDIT);
+	return security_ops->capable(cred, ns, cap, SECURITY_CAP_AUDIT);
 }
 
-int security_real_capable(struct task_struct *tsk, struct user_namespace *ns,
-			  int cap)
+int security_capable_noaudit(const struct cred *cred, struct user_namespace *ns,
+			     int cap)
 {
-	const struct cred *cred;
-	int ret;
-
-	cred = get_task_cred(tsk);
-	ret = security_ops->capable(tsk, cred, ns, cap, SECURITY_CAP_AUDIT);
-	put_cred(cred);
-	return ret;
-}
-
-int security_real_capable_noaudit(struct task_struct *tsk,
-				  struct user_namespace *ns, int cap)
-{
-	const struct cred *cred;
-	int ret;
-
-	cred = get_task_cred(tsk);
-	ret = security_ops->capable(tsk, cred, ns, cap, SECURITY_CAP_NOAUDIT);
-	put_cred(cred);
-	return ret;
+	return security_ops->capable(cred, ns, cap, SECURITY_CAP_NOAUDIT);
 }
 
 int security_quotactl(int cmds, int type, int id, struct super_block *sb)
@@ -994,12 +975,6 @@ int security_netlink_send(struct sock *sk, struct sk_buff *skb)
 	return security_ops->netlink_send(sk, skb);
 }
 
-int security_netlink_recv(struct sk_buff *skb, int cap)
-{
-	return security_ops->netlink_recv(skb, cap);
-}
-EXPORT_SYMBOL(security_netlink_recv);
-
 int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
 {
 	return security_ops->secid_to_secctx(secid, secdata, seclen);
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 7cd4c3a..6a3683e 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1415,8 +1415,7 @@ static int current_has_perm(const struct task_struct *tsk,
 #endif
 
 /* Check whether a task is allowed to use a capability. */
-static int task_has_capability(struct task_struct *tsk,
-			       const struct cred *cred,
+static int cred_has_capability(const struct cred *cred,
 			       int cap, int audit)
 {
 	struct common_audit_data ad;
@@ -1427,7 +1426,7 @@ static int task_has_capability(struct task_struct *tsk,
 	int rc;
 
 	COMMON_AUDIT_DATA_INIT(&ad, CAP);
-	ad.tsk = tsk;
+	ad.tsk = current;
 	ad.u.cap = cap;
 
 	switch (CAP_TO_INDEX(cap)) {
@@ -1811,7 +1810,7 @@ static int selinux_ptrace_access_check(struct task_struct *child,
 	if (rc)
 		return rc;
 
-	if (mode == PTRACE_MODE_READ) {
+	if (mode & PTRACE_MODE_READ) {
 		u32 sid = current_sid();
 		u32 csid = task_sid(child);
 		return avc_has_perm(sid, csid, SECCLASS_FILE, FILE__READ, NULL);
@@ -1868,16 +1867,16 @@ static int selinux_capset(struct cred *new, const struct cred *old,
  * the CAP_SETUID and CAP_SETGID capabilities using the capable hook.
  */
 
-static int selinux_capable(struct task_struct *tsk, const struct cred *cred,
-			   struct user_namespace *ns, int cap, int audit)
+static int selinux_capable(const struct cred *cred, struct user_namespace *ns,
+			   int cap, int audit)
 {
 	int rc;
 
-	rc = cap_capable(tsk, cred, ns, cap, audit);
+	rc = cap_capable(cred, ns, cap, audit);
 	if (rc)
 		return rc;
 
-	return task_has_capability(tsk, cred, cap, audit);
+	return cred_has_capability(cred, cap, audit);
 }
 
 static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb)
@@ -1954,8 +1953,7 @@ static int selinux_vm_enough_memory(struct mm_struct *mm, long pages)
 {
 	int rc, cap_sys_admin = 0;
 
-	rc = selinux_capable(current, current_cred(),
-			     &init_user_ns, CAP_SYS_ADMIN,
+	rc = selinux_capable(current_cred(), &init_user_ns, CAP_SYS_ADMIN,
 			     SECURITY_CAP_NOAUDIT);
 	if (rc == 0)
 		cap_sys_admin = 1;
@@ -2859,8 +2857,7 @@ static int selinux_inode_getsecurity(const struct inode *inode, const char *name
 	 * and lack of permission just means that we fall back to the
 	 * in-core context value, not a denial.
 	 */
-	error = selinux_capable(current, current_cred(),
-				&init_user_ns, CAP_MAC_ADMIN,
+	error = selinux_capable(current_cred(), &init_user_ns, CAP_MAC_ADMIN,
 				SECURITY_CAP_NOAUDIT);
 	if (!error)
 		error = security_sid_to_context_force(isec->sid, &context,
@@ -2993,8 +2990,8 @@ static int selinux_file_ioctl(struct file *file, unsigned int cmd,
 
 	case KDSKBENT:
 	case KDSKBSENT:
-		error = task_has_capability(current, cred, CAP_SYS_TTY_CONFIG,
-					SECURITY_CAP_AUDIT);
+		error = cred_has_capability(cred, CAP_SYS_TTY_CONFIG,
+					    SECURITY_CAP_AUDIT);
 		break;
 
 	/* default case assumes that the command will go
@@ -4718,24 +4715,6 @@ static int selinux_netlink_send(struct sock *sk, struct sk_buff *skb)
 	return selinux_nlmsg_perm(sk, skb);
 }
 
-static int selinux_netlink_recv(struct sk_buff *skb, int capability)
-{
-	int err;
-	struct common_audit_data ad;
-	u32 sid;
-
-	err = cap_netlink_recv(skb, capability);
-	if (err)
-		return err;
-
-	COMMON_AUDIT_DATA_INIT(&ad, CAP);
-	ad.u.cap = capability;
-
-	security_task_getsecid(current, &sid);
-	return avc_has_perm(sid, sid, SECCLASS_CAPABILITY,
-			    CAP_TO_MASK(capability), &ad);
-}
-
 static int ipc_alloc_security(struct task_struct *task,
 			      struct kern_ipc_perm *perm,
 			      u16 sclass)
@@ -5464,7 +5443,6 @@ static struct security_operations selinux_ops = {
 	.vm_enough_memory =		selinux_vm_enough_memory,
 
 	.netlink_send =			selinux_netlink_send,
-	.netlink_recv =			selinux_netlink_recv,
 
 	.bprm_set_creds =		selinux_bprm_set_creds,
 	.bprm_committing_creds =	selinux_bprm_committing_creds,