1 files changed, 168 insertions, 10 deletions

diff --git a/include/linux/security.h b/include/linux/security.h
index 5eff459b3833..d050b66ab9ef 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -28,6 +28,7 @@
 #include <linux/resource.h>
 #include <linux/sem.h>
 #include <linux/shm.h>
+#include <linux/mm.h> /* PAGE_ALIGN */
 #include <linux/msg.h>
 #include <linux/sched.h>
 #include <linux/key.h>
@@ -52,7 +53,7 @@ struct audit_krule;
 extern int cap_capable(struct task_struct *tsk, const struct cred *cred,
                        int cap, int audit);
 extern int cap_settime(struct timespec *ts, struct timezone *tz);
-extern int cap_ptrace_may_access(struct task_struct *child, unsigned int mode);
+extern int cap_ptrace_access_check(struct task_struct *child, unsigned int mode);
 extern int cap_ptrace_traceme(struct task_struct *parent);
 extern int cap_capget(struct task_struct *target, kernel_cap_t *effective, kernel_cap_t *inheritable, kernel_cap_t *permitted);
 extern int cap_capset(struct cred *new, const struct cred *old,
@@ -66,6 +67,9 @@ extern int cap_inode_setxattr(struct dentry *dentry, const char *name,
 extern int cap_inode_removexattr(struct dentry *dentry, const char *name);
 extern int cap_inode_need_killpriv(struct dentry *dentry);
 extern int cap_inode_killpriv(struct dentry *dentry);
+extern int cap_file_mmap(struct file *file, unsigned long reqprot,
+                         unsigned long prot, unsigned long flags,
+                         unsigned long addr, unsigned long addr_only);
 extern int cap_task_fix_setuid(struct cred *new, const struct cred *old, int flags);
 extern int cap_task_prctl(int option, unsigned long arg2, unsigned long arg3,
                           unsigned long arg4, unsigned long arg5);
@@ -92,6 +96,7 @@ extern int cap_netlink_send(struct sock *sk, struct sk_buff *skb);
 extern int cap_netlink_recv(struct sk_buff *skb, int cap);
 
 extern unsigned long mmap_min_addr;
+extern unsigned long dac_mmap_min_addr;
 /*
  * Values used in the task_security_ops calls
  */
@@ -116,6 +121,21 @@ struct request_sock;
 #define LSM_UNSAFE_PTRACE       2
 #define LSM_UNSAFE_PTRACE_CAP   4
 
+/*
+ * If a hint addr is less than mmap_min_addr change hint to be as
+ * low as possible but still greater than mmap_min_addr
+ */
+static inline unsigned long round_hint_to_min(unsigned long hint)
+{
+        hint &= PAGE_MASK;
+        if (((void *)hint != NULL) &&
+            (hint < mmap_min_addr))
+                return PAGE_ALIGN(mmap_min_addr);
+        return hint;
+}
+extern int mmap_min_addr_handler(struct ctl_table *table, int write, struct file *filp,
+                                 void __user *buffer, size_t *lenp, loff_t *ppos);
+
 #ifdef CONFIG_SECURITY
 
 struct security_mnt_opts {
@@ -633,6 +653,11 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
  *      manual page for definitions of the @clone_flags.
  *      @clone_flags contains the flags indicating what should be shared.
  *      Return 0 if permission is granted.
+ * @cred_alloc_blank:
+ *      @cred points to the credentials.
+ *      @gfp indicates the atomicity of any memory allocations.
+ *      Only allocate sufficient memory and attach to @cred such that
+ *      cred_transfer() will not get ENOMEM.
  * @cred_free:
  *      @cred points to the credentials.
  *      Deallocate and clear the cred->security field in a set of credentials.
@@ -645,6 +670,10 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
  *      @new points to the new credentials.
  *      @old points to the original credentials.
  *      Install a new set of credentials.
+ * @cred_transfer:
+ *      @new points to the new credentials.
+ *      @old points to the original credentials.
+ *      Transfer data from original creds to new creds
  * @kernel_act_as:
  *      Set the credentials for a kernel service to act as (subjective context).
  *      @new points to the credentials to be modified.
@@ -658,6 +687,10 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
  *      @inode points to the inode to use as a reference.
  *      The current task must be the one that nominated @inode.
  *      Return 0 if successful.
+ * @kernel_module_request:
+ *      Ability to trigger the kernel to automatically upcall to userspace for
+ *      userspace to load a kernel module with the given name.
+ *      Return 0 if successful.
  * @task_setuid:
  *      Check permission before setting one or more of the user identity
  *      attributes of the current process.  The @flags parameter indicates
@@ -974,6 +1007,17 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
  *      Sets the connection's peersid to the secmark on skb.
  * @req_classify_flow:
  *      Sets the flow's sid to the openreq sid.
+ * @tun_dev_create:
+ *      Check permissions prior to creating a new TUN device.
+ * @tun_dev_post_create:
+ *      This hook allows a module to update or allocate a per-socket security
+ *      structure.
+ *      @sk contains the newly created sock structure.
+ * @tun_dev_attach:
+ *      Check permissions prior to attaching to a persistent TUN device.  This
+ *      hook can also be used by the module to update any security state
+ *      associated with the TUN device's sock structure.
+ *      @sk contains the existing sock structure.
  *
  * Security hooks for XFRM operations.
  *
@@ -1068,6 +1112,13 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
  *      Return the length of the string (including terminating NUL) or -ve if
  *      an error.
  *      May also return 0 (and a NULL buffer pointer) if there is no label.
+ * @key_session_to_parent:
+ *      Forcibly assign the session keyring from a process to its parent
+ *      process.
+ *      @cred: Pointer to process's credentials
+ *      @parent_cred: Pointer to parent process's credentials
+ *      @keyring: Proposed new session keyring
+ *      Return 0 if permission is granted, -ve error otherwise.
  *
  * Security hooks affecting all System V IPC operations.
  *
@@ -1209,7 +1260,7 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
  *      @alter contains the flag indicating whether changes are to be made.
  *      Return 0 if permission is granted.
  *
- * @ptrace_may_access:
+ * @ptrace_access_check:
  *      Check permission before allowing the current process to trace the
  *      @child process.
  *      Security modules may also want to perform a process tracing check
@@ -1224,7 +1275,7 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
  *      Check that the @parent process has sufficient permission to trace the
  *      current process before allowing the current process to present itself
  *      to the @parent process for tracing.
- *      The parent process will still have to undergo the ptrace_may_access
+ *      The parent process will still have to undergo the ptrace_access_check
  *      checks before it is allowed to trace this one.
  *      @parent contains the task_struct structure for debugger process.
  *      Return 0 if permission is granted.
@@ -1331,12 +1382,47 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts)
  *      audit_rule_init.
  *      @rule contains the allocated rule
  *
+ * @inode_notifysecctx:
+ *      Notify the security module of what the security context of an inode
+ *      should be.  Initializes the incore security context managed by the
+ *      security module for this inode.  Example usage:  NFS client invokes
+ *      this hook to initialize the security context in its incore inode to the
+ *      value provided by the server for the file when the server returned the
+ *      file's attributes to the client.
+ *
+ *      Must be called with inode->i_mutex locked.
+ *
+ *      @inode we wish to set the security context of.
+ *      @ctx contains the string which we wish to set in the inode.
+ *      @ctxlen contains the length of @ctx.
+ *
+ * @inode_setsecctx:
+ *      Change the security context of an inode.  Updates the
+ *      incore security context managed by the security module and invokes the
+ *      fs code as needed (via __vfs_setxattr_noperm) to update any backing
+ *      xattrs that represent the context.  Example usage:  NFS server invokes
+ *      this hook to change the security context in its incore inode and on the
+ *      backing filesystem to a value provided by the client on a SETATTR
+ *      operation.
+ *
+ *      Must be called with inode->i_mutex locked.
+ *
+ *      @dentry contains the inode we wish to set the security context of.
+ *      @ctx contains the string which we wish to set in the inode.
+ *      @ctxlen contains the length of @ctx.
+ *
+ * @inode_getsecctx:
+ *      Returns a string containing all relavent security context information
+ *
+ *      @inode we wish to set the security context of.
+ *      @ctx is a pointer in which to place the allocated security context.
+ *      @ctxlen points to the place to put the length of @ctx.
  * This is the main security structure.
  */
 struct security_operations {
         char name[SECURITY_NAME_MAX + 1];
 
-        int (*ptrace_may_access) (struct task_struct *child, unsigned int mode);
+        int (*ptrace_access_check) (struct task_struct *child, unsigned int mode);
         int (*ptrace_traceme) (struct task_struct *parent);
         int (*capget) (struct task_struct *target,
                        kernel_cap_t *effective,
@@ -1463,12 +1549,15 @@ struct security_operations {
         int (*dentry_open) (struct file *file, const struct cred *cred);
 
         int (*task_create) (unsigned long clone_flags);
+        int (*cred_alloc_blank) (struct cred *cred, gfp_t gfp);
         void (*cred_free) (struct cred *cred);
         int (*cred_prepare)(struct cred *new, const struct cred *old,
                             gfp_t gfp);
         void (*cred_commit)(struct cred *new, const struct cred *old);
+        void (*cred_transfer)(struct cred *new, const struct cred *old);
         int (*kernel_act_as)(struct cred *new, u32 secid);
         int (*kernel_create_files_as)(struct cred *new, struct inode *inode);
+        int (*kernel_module_request)(void);
         int (*task_setuid) (uid_t id0, uid_t id1, uid_t id2, int flags);
         int (*task_fix_setuid) (struct cred *new, const struct cred *old,
                                 int flags);
@@ -1536,6 +1625,10 @@ struct security_operations {
         int (*secctx_to_secid) (const char *secdata, u32 seclen, u32 *secid);
         void (*release_secctx) (char *secdata, u32 seclen);
 
+        int (*inode_notifysecctx)(struct inode *inode, void *ctx, u32 ctxlen);
+        int (*inode_setsecctx)(struct dentry *dentry, void *ctx, u32 ctxlen);
+        int (*inode_getsecctx)(struct inode *inode, void **ctx, u32 *ctxlen);
+
 #ifdef CONFIG_SECURITY_NETWORK
         int (*unix_stream_connect) (struct socket *sock,
                                     struct socket *other, struct sock *newsk);
@@ -1572,6 +1665,9 @@ struct security_operations {
         void (*inet_csk_clone) (struct sock *newsk, const struct request_sock *req);
         void (*inet_conn_established) (struct sock *sk, struct sk_buff *skb);
         void (*req_classify_flow) (const struct request_sock *req, struct flowi *fl);
+        int (*tun_dev_create)(void);
+        void (*tun_dev_post_create)(struct sock *sk);
+        int (*tun_dev_attach)(struct sock *sk);
 #endif  /* CONFIG_SECURITY_NETWORK */
 
 #ifdef CONFIG_SECURITY_NETWORK_XFRM
@@ -1600,6 +1696,9 @@ struct security_operations {
                                const struct cred *cred,
                                key_perm_t perm);
         int (*key_getsecurity)(struct key *key, char **_buffer);
+        int (*key_session_to_parent)(const struct cred *cred,
+                                     const struct cred *parent_cred,
+                                     struct key *key);
 #endif  /* CONFIG_KEYS */
 
 #ifdef CONFIG_AUDIT
@@ -1617,7 +1716,7 @@ extern int security_module_enable(struct security_operations *ops);
 extern int register_security(struct security_operations *ops);
 
 /* Security operations */
-int security_ptrace_may_access(struct task_struct *child, unsigned int mode);
+int security_ptrace_access_check(struct task_struct *child, unsigned int mode);
 int security_ptrace_traceme(struct task_struct *parent);
 int security_capget(struct task_struct *target,
                     kernel_cap_t *effective,
@@ -1716,11 +1815,14 @@ int security_file_send_sigiotask(struct task_struct *tsk,
 int security_file_receive(struct file *file);
 int security_dentry_open(struct file *file, const struct cred *cred);
 int security_task_create(unsigned long clone_flags);
+int security_cred_alloc_blank(struct cred *cred, gfp_t gfp);
 void security_cred_free(struct cred *cred);
 int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp);
 void security_commit_creds(struct cred *new, const struct cred *old);
+void security_transfer_creds(struct cred *new, const struct cred *old);
 int security_kernel_act_as(struct cred *new, u32 secid);
 int security_kernel_create_files_as(struct cred *new, struct inode *inode);
+int security_kernel_module_request(void);
 int security_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags);
 int security_task_fix_setuid(struct cred *new, const struct cred *old,
                              int flags);
@@ -1776,6 +1878,9 @@ int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen);
 int security_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid);
 void security_release_secctx(char *secdata, u32 seclen);
 
+int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen);
+int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen);
+int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen);
 #else /* CONFIG_SECURITY */
 struct security_mnt_opts {
 };
@@ -1798,10 +1903,10 @@ static inline int security_init(void)
         return 0;
 }
 
-static inline int security_ptrace_may_access(struct task_struct *child,
+static inline int security_ptrace_access_check(struct task_struct *child,
                                              unsigned int mode)
 {
-        return cap_ptrace_may_access(child, mode);
+        return cap_ptrace_access_check(child, mode);
 }
 
 static inline int security_ptrace_traceme(struct task_struct *parent)
@@ -2197,9 +2302,7 @@ static inline int security_file_mmap(struct file *file, unsigned long reqprot,
                                      unsigned long addr,
                                      unsigned long addr_only)
 {
-        if ((addr < mmap_min_addr) && !capable(CAP_SYS_RAWIO))
-                return -EACCES;
-        return 0;
+        return cap_file_mmap(file, reqprot, prot, flags, addr, addr_only);
 }
 
 static inline int security_file_mprotect(struct vm_area_struct *vma,
@@ -2248,6 +2351,11 @@ static inline int security_task_create(unsigned long clone_flags)
         return 0;
 }
 
+static inline int security_cred_alloc_blank(struct cred *cred, gfp_t gfp)
+{
+        return 0;
+}
+
 static inline void security_cred_free(struct cred *cred)
 { }
 
@@ -2263,6 +2371,11 @@ static inline void security_commit_creds(struct cred *new,
 {
 }
 
+static inline void security_transfer_creds(struct cred *new,
+                                           const struct cred *old)
+{
+}
+
 static inline int security_kernel_act_as(struct cred *cred, u32 secid)
 {
         return 0;
@@ -2274,6 +2387,11 @@ static inline int security_kernel_create_files_as(struct cred *cred,
         return 0;
 }
 
+static inline int security_kernel_module_request(void)
+{
+        return 0;
+}
+
 static inline int security_task_setuid(uid_t id0, uid_t id1, uid_t id2,
                                        int flags)
 {
@@ -2519,6 +2637,19 @@ static inline int security_secctx_to_secid(const char *secdata,
 static inline void security_release_secctx(char *secdata, u32 seclen)
 {
 }
+
+static inline int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
+{
+        return -EOPNOTSUPP;
+}
+static inline int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
+{
+        return -EOPNOTSUPP;
+}
+static inline int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
+{
+        return -EOPNOTSUPP;
+}
 #endif  /* CONFIG_SECURITY */
 
 #ifdef CONFIG_SECURITY_NETWORK
@@ -2557,6 +2688,9 @@ void security_inet_csk_clone(struct sock *newsk,
                         const struct request_sock *req);
 void security_inet_conn_established(struct sock *sk,
                         struct sk_buff *skb);
+int security_tun_dev_create(void);
+void security_tun_dev_post_create(struct sock *sk);
+int security_tun_dev_attach(struct sock *sk);
 
 #else   /* CONFIG_SECURITY_NETWORK */
 static inline int security_unix_stream_connect(struct socket *sock,
@@ -2707,6 +2841,20 @@ static inline void security_inet_conn_established(struct sock *sk,
                         struct sk_buff *skb)
 {
 }
+
+static inline int security_tun_dev_create(void)
+{
+        return 0;
+}
+
+static inline void security_tun_dev_post_create(struct sock *sk)
+{
+}
+
+static inline int security_tun_dev_attach(struct sock *sk)
+{
+        return 0;
+}
 #endif  /* CONFIG_SECURITY_NETWORK */
 
 #ifdef CONFIG_SECURITY_NETWORK_XFRM
@@ -2863,6 +3011,9 @@ void security_key_free(struct key *key);
 int security_key_permission(key_ref_t key_ref,
                             const struct cred *cred, key_perm_t perm);
 int security_key_getsecurity(struct key *key, char **_buffer);
+int security_key_session_to_parent(const struct cred *cred,
+                                   const struct cred *parent_cred,
+                                   struct key *key);
 
 #else
 
@@ -2890,6 +3041,13 @@ static inline int security_key_getsecurity(struct key *key, char **_buffer)
         return 0;
 }
 
+static inline int security_key_session_to_parent(const struct cred *cred,
+                                                 const struct cred *parent_cred,
+                                                 struct key *key)
+{
+        return 0;
+}
+
 #endif
 #endif /* CONFIG_KEYS */