+static inline void bprm_clear_caps(struct linux_binprm *bprm)
+{
+ cap_clear(bprm->cap_inheritable);
+ cap_clear(bprm->cap_permitted);
+ bprm->cap_effective = false;
+}
+
+#ifdef CONFIG_SECURITY_FILE_CAPABILITIES
+
+int cap_inode_need_killpriv(struct dentry *dentry)
+{
+ struct inode *inode = dentry->d_inode;
+ int error;
+
+ if (!inode->i_op || !inode->i_op->getxattr)
+ return 0;
+
+ error = inode->i_op->getxattr(dentry, XATTR_NAME_CAPS, NULL, 0);
+ if (error <= 0)
+ return 0;
+ return 1;
+}
+
+int cap_inode_killpriv(struct dentry *dentry)
+{
+ struct inode *inode = dentry->d_inode;
+
+ if (!inode->i_op || !inode->i_op->removexattr)
+ return 0;
+
+ return inode->i_op->removexattr(dentry, XATTR_NAME_CAPS);
+}
+
+static inline int cap_from_disk(struct vfs_cap_data *caps,
+ struct linux_binprm *bprm,
+ int size)
+{
+ __u32 magic_etc;
+
+ if (size != XATTR_CAPS_SZ)
+ return -EINVAL;
+
+ magic_etc = le32_to_cpu(caps->magic_etc);
+
+ switch ((magic_etc & VFS_CAP_REVISION_MASK)) {
+ case VFS_CAP_REVISION:
+ if (magic_etc & VFS_CAP_FLAGS_EFFECTIVE)
+ bprm->cap_effective = true;
+ else
+ bprm->cap_effective = false;
+ bprm->cap_permitted = to_cap_t(le32_to_cpu(caps->permitted));
+ bprm->cap_inheritable = to_cap_t(le32_to_cpu(caps->inheritable));
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
+
+/* Locate any VFS capabilities: */
+static int get_file_caps(struct linux_binprm *bprm)
+{
+ struct dentry *dentry;
+ int rc = 0;
+ struct vfs_cap_data incaps;
+ struct inode *inode;
+
+ if (bprm->file->f_vfsmnt->mnt_flags & MNT_NOSUID) {
+ bprm_clear_caps(bprm);
+ return 0;
+ }
+
+ dentry = dget(bprm->file->f_dentry);
+ inode = dentry->d_inode;
+ if (!inode->i_op || !inode->i_op->getxattr)
+ goto out;
+
+ rc = inode->i_op->getxattr(dentry, XATTR_NAME_CAPS, NULL, 0);
+ if (rc > 0) {
+ if (rc == XATTR_CAPS_SZ)
+ rc = inode->i_op->getxattr(dentry, XATTR_NAME_CAPS,
+ &incaps, XATTR_CAPS_SZ);
+ else
+ rc = -EINVAL;
+ }
+ if (rc == -ENODATA || rc == -EOPNOTSUPP) {
+ /* no data, that's ok */
+ rc = 0;
+ goto out;
+ }
+ if (rc < 0)
+ goto out;
+
+ rc = cap_from_disk(&incaps, bprm, rc);
+ if (rc)
+ printk(KERN_NOTICE "%s: cap_from_disk returned %d for %s\n",
+ __FUNCTION__, rc, bprm->filename);
+
+out:
+ dput(dentry);
+ if (rc)
+ bprm_clear_caps(bprm);
+
+ return rc;
+}
+
+#else
+int cap_inode_need_killpriv(struct dentry *dentry)
+{
+ return 0;
+}
+
+int cap_inode_killpriv(struct dentry *dentry)
+{
+ return 0;
+}
+
+static inline int get_file_caps(struct linux_binprm *bprm)
+{
+ bprm_clear_caps(bprm);
+ return 0;
+}
+#endif
+