Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...

[sfrench/cifs-2.6.git] / security / selinux / hooks.c

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index b332e2cc0954becf1fa365f9690fef63d52ba97c..869c2f1e0da187f9f406798f3afba3df90cd98ad 100644 (file)
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -106,7 +106,7 @@ int selinux_enforcing;
 static int __init enforcing_setup(char *str)
 {
        unsigned long enforcing;
-       if (!strict_strtoul(str, 0, &enforcing))
+       if (!kstrtoul(str, 0, &enforcing))
                selinux_enforcing = enforcing ? 1 : 0;
        return 1;
 }
@@ -119,7 +119,7 @@ int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE;
 static int __init selinux_enabled_setup(char *str)
 {
        unsigned long enabled;
-       if (!strict_strtoul(str, 0, &enabled))
+       if (!kstrtoul(str, 0, &enabled))
                selinux_enabled = enabled ? 1 : 0;
        return 1;
 }
@@ -1418,15 +1418,33 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
                isec->sid = sbsec->sid;
 
                if ((sbsec->flags & SE_SBPROC) && !S_ISLNK(inode->i_mode)) {
-                       if (opt_dentry) {
-                               isec->sclass = inode_mode_to_security_class(inode->i_mode);
-                               rc = selinux_proc_get_sid(opt_dentry,
-                                                         isec->sclass,
-                                                         &sid);
-                               if (rc)
-                                       goto out_unlock;
-                               isec->sid = sid;
-                       }
+                       /* We must have a dentry to determine the label on
+                        * procfs inodes */
+                       if (opt_dentry)
+                               /* Called from d_instantiate or
+                                * d_splice_alias. */
+                               dentry = dget(opt_dentry);
+                       else
+                               /* Called from selinux_complete_init, try to
+                                * find a dentry. */
+                               dentry = d_find_alias(inode);
+                       /*
+                        * This can be hit on boot when a file is accessed
+                        * before the policy is loaded.  When we load policy we
+                        * may find inodes that have no dentry on the
+                        * sbsec->isec_head list.  No reason to complain as
+                        * these will get fixed up the next time we go through
+                        * inode_doinit() with a dentry, before these inodes
+                        * could be used again by userspace.
+                        */
+                       if (!dentry)
+                               goto out_unlock;
+                       isec->sclass = inode_mode_to_security_class(inode->i_mode);
+                       rc = selinux_proc_get_sid(dentry, isec->sclass, &sid);
+                       dput(dentry);
+                       if (rc)
+                               goto out_unlock;
+                       isec->sid = sid;
                }
                break;
        }
@@ -3205,24 +3223,20 @@ error:
 
 static int selinux_mmap_addr(unsigned long addr)
 {
-       int rc = 0;
-       u32 sid = current_sid();
+       int rc;
+
+       /* do DAC check on address space usage */
+       rc = cap_mmap_addr(addr);
+       if (rc)
+               return rc;
 
-       /*
-        * notice that we are intentionally putting the SELinux check before
-        * the secondary cap_file_mmap check.  This is such a likely attempt
-        * at bad behaviour/exploit that we always want to get the AVC, even
-        * if DAC would have also denied the operation.
-        */
        if (addr < CONFIG_LSM_MMAP_MIN_ADDR) {
+               u32 sid = current_sid();
                rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT,
                                  MEMPROTECT__MMAP_ZERO, NULL);
-               if (rc)
-                       return rc;
        }
 
-       /* do DAC check on address space usage */
-       return cap_mmap_addr(addr);
+       return rc;
 }
 
 static int selinux_mmap_file(struct file *file, unsigned long reqprot,