split ->file_mmap() into ->mmap_addr()/->mmap_file()

... i.e. file-dependent and address-dependent checks.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

6 files changed, 30 insertions, 51 deletions

diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index 8430d8937afb..8ea39aabe948 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -490,17 +490,9 @@ static int common_mmap(int op, struct file *file, unsigned long prot,
         return common_file_perm(op, file, mask);
 }
 
-static int apparmor_file_mmap(struct file *file, unsigned long reqprot,
-                              unsigned long prot, unsigned long flags,
-                              unsigned long addr, unsigned long addr_only)
+static int apparmor_mmap_file(struct file *file, unsigned long reqprot,
+                              unsigned long prot, unsigned long flags)
 {
-        int rc = 0;
-
-        /* do DAC check */
-        rc = cap_mmap_addr(addr);
-        if (rc || addr_only)
-                return rc;
-
         return common_mmap(OP_FMMAP, file, prot, flags);
 }
 
@@ -646,7 +638,8 @@ static struct security_operations apparmor_ops = {
         .file_permission =              apparmor_file_permission,
         .file_alloc_security =          apparmor_file_alloc_security,
         .file_free_security =           apparmor_file_free_security,
-        .file_mmap =                    apparmor_file_mmap,
+        .mmap_file =                    apparmor_mmap_file,
+        .mmap_addr =                    cap_mmap_addr,
         .file_mprotect =                apparmor_file_mprotect,
         .file_lock =                    apparmor_file_lock,
 
diff --git a/security/capability.c b/security/capability.c
index fca889676c5e..61095df8b89a 100644
--- a/security/capability.c
+++ b/security/capability.c
@@ -949,7 +949,8 @@ void __init security_fixup_ops(struct security_operations *ops)
         set_to_cap_if_null(ops, file_alloc_security);
         set_to_cap_if_null(ops, file_free_security);
         set_to_cap_if_null(ops, file_ioctl);
-        set_to_cap_if_null(ops, file_mmap);
+        set_to_cap_if_null(ops, mmap_addr);
+        set_to_cap_if_null(ops, mmap_file);
         set_to_cap_if_null(ops, file_mprotect);
         set_to_cap_if_null(ops, file_lock);
         set_to_cap_if_null(ops, file_fcntl);
diff --git a/security/commoncap.c b/security/commoncap.c
index ebac3618896e..6dbae4650abe 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -980,23 +980,8 @@ int cap_mmap_addr(unsigned long addr)
         return ret;
 }
 
-/*
- * cap_file_mmap - check if able to map given addr
- * @file: unused
- * @reqprot: unused
- * @prot: unused
- * @flags: unused
- * @addr: address attempting to be mapped
- * @addr_only: unused
- *
- * If the process is attempting to map memory below dac_mmap_min_addr they need
- * CAP_SYS_RAWIO.  The other parameters to this function are unused by the
- * capability security module.  Returns 0 if this mapping should be allowed
- * -EPERM if not.
- */
-int cap_file_mmap(struct file *file, unsigned long reqprot,
-                  unsigned long prot, unsigned long flags,
-                  unsigned long addr, unsigned long addr_only)
+int cap_mmap_file(struct file *file, unsigned long reqprot,
+                  unsigned long prot, unsigned long flags)
 {
-        return cap_mmap_addr(addr);
+        return 0;
 }
diff --git a/security/security.c b/security/security.c
index 5497a57fba01..d91c66d3956b 100644
--- a/security/security.c
+++ b/security/security.c
@@ -657,18 +657,22 @@ int security_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
         return security_ops->file_ioctl(file, cmd, arg);
 }
 
-int security_file_mmap(struct file *file, unsigned long reqprot,
-                        unsigned long prot, unsigned long flags,
-                        unsigned long addr, unsigned long addr_only)
+int security_mmap_file(struct file *file, unsigned long reqprot,
+                        unsigned long prot, unsigned long flags)
 {
         int ret;
 
-        ret = security_ops->file_mmap(file, reqprot, prot, flags, addr, addr_only);
+        ret = security_ops->mmap_file(file, reqprot, prot, flags);
         if (ret)
                 return ret;
         return ima_file_mmap(file, prot);
 }
 
+int security_mmap_addr(unsigned long addr)
+{
+        return security_ops->mmap_addr(addr);
+}
+
 int security_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot,
                             unsigned long prot)
 {
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 25c125eaa3d8..372ec6502aa8 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -3083,9 +3083,7 @@ error:
         return rc;
 }
 
-static int selinux_file_mmap(struct file *file, unsigned long reqprot,
-                             unsigned long prot, unsigned long flags,
-                             unsigned long addr, unsigned long addr_only)
+static int selinux_mmap_addr(unsigned long addr)
 {
         int rc = 0;
         u32 sid = current_sid();
@@ -3104,10 +3102,12 @@ static int selinux_file_mmap(struct file *file, unsigned long reqprot,
         }
 
         /* do DAC check on address space usage */
-        rc = cap_mmap_addr(addr);
-        if (rc || addr_only)
-                return rc;
+        return cap_mmap_addr(addr);
+}
 
+static int selinux_mmap_file(struct file *file, unsigned long reqprot,
+                             unsigned long prot, unsigned long flags)
+{
         if (selinux_checkreqprot)
                 prot = reqprot;
 
@@ -5570,7 +5570,8 @@ static struct security_operations selinux_ops = {
         .file_alloc_security =          selinux_file_alloc_security,
         .file_free_security =           selinux_file_free_security,
         .file_ioctl =                   selinux_file_ioctl,
-        .file_mmap =                    selinux_file_mmap,
+        .mmap_file =                    selinux_mmap_file,
+        .mmap_addr =                    selinux_mmap_addr,
         .file_mprotect =                selinux_file_mprotect,
         .file_lock =                    selinux_file_lock,
         .file_fcntl =                   selinux_file_fcntl,
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index a62197718768..ee0bb5735f35 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -1171,7 +1171,7 @@ static int smack_file_fcntl(struct file *file, unsigned int cmd,
 }
 
 /**
- * smack_file_mmap :
+ * smack_mmap_file :
  * Check permissions for a mmap operation.  The @file may be NULL, e.g.
  * if mapping anonymous memory.
  * @file contains the file structure for file to map (may be NULL).
@@ -1180,10 +1180,9 @@ static int smack_file_fcntl(struct file *file, unsigned int cmd,
  * @flags contains the operational flags.
  * Return 0 if permission is granted.
  */
-static int smack_file_mmap(struct file *file,
+static int smack_mmap_file(struct file *file,
                            unsigned long reqprot, unsigned long prot,
-                           unsigned long flags, unsigned long addr,
-                           unsigned long addr_only)
+                           unsigned long flags)
 {
         struct smack_known *skp;
         struct smack_rule *srp;
@@ -1198,11 +1197,6 @@ static int smack_file_mmap(struct file *file,
         int tmay;
         int rc;
 
-        /* do DAC check on address space usage */
-        rc = cap_mmap_addr(addr);
-        if (rc || addr_only)
-                return rc;
-
         if (file == NULL || file->f_dentry == NULL)
                 return 0;
 
@@ -3482,7 +3476,8 @@ struct security_operations smack_ops = {
         .file_ioctl =                   smack_file_ioctl,
         .file_lock =                    smack_file_lock,
         .file_fcntl =                   smack_file_fcntl,
-        .file_mmap =                    smack_file_mmap,
+        .mmap_file =                    smack_mmap_file,
+        .mmap_addr =                    cap_mmap_addr,
         .file_set_fowner =              smack_file_set_fowner,
         .file_send_sigiotask =          smack_file_send_sigiotask,
         .file_receive =                 smack_file_receive,