security: define kernel_read_file hook

The kernel_read_file security hook is called prior to reading the file
into memory.

Changelog v4+:
- export security_kernel_read_file()

Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Luis R. Rodriguez <mcgrof@kernel.org>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index 7d04a1220223..d32b7bd13635 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -552,6 +552,12 @@
  *      the kernel module to load. If the module is being loaded from a blob,
  *      this argument will be NULL.
  *      Return 0 if permission is granted.
+ * @kernel_read_file:
+ *      Read a file specified by userspace.
+ *      @file contains the file structure pointing to the file being read
+ *      by the kernel.
+ *      @id kernel read file identifier
+ *      Return 0 if permission is granted.
  * @kernel_post_read_file:
  *      Read a file specified by userspace.
  *      @file contains the file structure pointing to the file being read
@@ -1455,6 +1461,7 @@ union security_list_options {
         int (*kernel_create_files_as)(struct cred *new, struct inode *inode);
         int (*kernel_module_request)(char *kmod_name);
         int (*kernel_module_from_file)(struct file *file);
+        int (*kernel_read_file)(struct file *file, enum kernel_read_file_id id);
         int (*kernel_post_read_file)(struct file *file, char *buf, loff_t size,
                                      enum kernel_read_file_id id);
         int (*task_fix_setuid)(struct cred *new, const struct cred *old,
@@ -1715,6 +1722,7 @@ struct security_hook_heads {
         struct list_head cred_transfer;
         struct list_head kernel_act_as;
         struct list_head kernel_create_files_as;
+        struct list_head kernel_read_file;
         struct list_head kernel_post_read_file;
         struct list_head kernel_module_request;
         struct list_head kernel_module_from_file;