fdt: Allow device tree to specify secure booting

When secure booting is chosen:
* The u-boot shell is never invoked during boot--we just do a simple
  table lookup to find the command.  This means we could even remove
  the shell parsing from u-boot and still be able to boot.
* The boot command can't be interruped.
* Failure doesn't cause us to fall back to the shell.

Signed-off-by: Gabe Black <gabeblack@google.com>
Signed-off-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/common/main.c b/common/main.c
index fd70928..61c6cac 100644 (file)
--- a/common/main.c
+++ b/common/main.c
@@ -283,6 +283,59 @@ int abortboot(int bootdelay)
 # endif        /* CONFIG_AUTOBOOT_KEYED */
 #endif /* CONFIG_BOOTDELAY >= 0  */
 
+/*
+ * Runs the given boot command securely.  Specifically:
+ * - Doesn't run the command with the shell (run_command or parse_string_outer),
+ *   since that's a lot of code surface that an attacker might exploit.
+ *   Because of this, we don't do any argument parsing--the secure boot command
+ *   has to be a full-fledged u-boot command.
+ * - Doesn't check for keypresses before booting, since that could be a
+ *   security hole; also disables Ctrl-C.
+ * - Doesn't allow the command to return.
+ *
+ * Upon any failures, this function will drop into an infinite loop after
+ * printing the error message to console.
+ */
+
+#if defined(CONFIG_BOOTDELAY) && (CONFIG_BOOTDELAY >= 0) && \
+       defined(CONFIG_OF_CONTROL)
+static void secure_boot_cmd(char *cmd)
+{
+       cmd_tbl_t *cmdtp;
+       int rc;
+
+       if (!cmd) {
+               printf("## Error: Secure boot command not specified\n");
+               goto err;
+       }
+
+       /* Disable Ctrl-C just in case some command is used that checks it. */
+       disable_ctrlc(1);
+
+       /* Find the command directly. */
+       cmdtp = find_cmd(cmd);
+       if (!cmdtp) {
+               printf("## Error: \"%s\" not defined\n", cmd);
+               goto err;
+       }
+
+       /* Run the command, forcing no flags and faking argc and argv. */
+       rc = (cmdtp->cmd)(cmdtp, 0, 1, &cmd);
+
+       /* Shouldn't ever return from boot command. */
+       printf("## Error: \"%s\" returned (code %d)\n", cmd, rc);
+
+err:
+       /*
+        * Not a whole lot to do here.  Rebooting won't help much, since we'll
+        * just end up right back here.  Just loop.
+        */
+       hang();
+}
+
+#endif /* CONFIG_OF_CONTROL */
+
+
 /****************************************************************************/
 
 void main_loop (void)
@@ -397,6 +450,15 @@ void main_loop (void)
        env = fdtdec_get_config_string(gd->fdt_blob, "bootcmd");
        if (env)
                s = env;
+
+       /*
+        * If the bootsecure option was chosen, use secure_boot_cmd().
+        * Always use 'env' in this case, since bootsecure requres that the
+        * bootcmd was specified in the FDT too.
+        */
+       if (fdtdec_get_config_int(gd->fdt_blob, "bootsecure", 0))
+               secure_boot_cmd(env);
+
 #endif /* CONFIG_OF_CONTROL */
 
        debug ("### main_loop: bootcmd=\"%s\"\n", s ? s : "<UNDEFINED>");