arm: Add CONFIG_DELAY_ENVIRONMENT to delay environment loading

This option delays loading of the environment until later, so that only the
default environment will be available to U-Boot.

This can address the security risk of untrusted data being used during boot.

Any time you load untrusted data you expose yourself to a bug in the
code. The attacker gets to choose the data so can sometimes carefully
craft it to exploit a bug. We try to avoid touching user-controlled
data during a verified boot unless strictly necessary. Since the
default environment is good enough in this case (or you would just
change it), this gets around the problem by just not loading the
environment.

When CONFIG_DELAY_ENVIRONMENT is defined, it is convenient to have a
run-time way of enabling loading of the environment. Add this to the
fdt as /config/delay-environment.

Note: This patch depends on http://patchwork.ozlabs.org/patch/194342/

Signed-off-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Doug Anderson <dianders@chromium.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/README b/README
index 653ef6aa4a5..ef8571c8981 100644
--- a/README
+++ b/README
@@ -2378,6 +2378,15 @@ CBFS (Coreboot Filesystem) support
 		run-time determined information about the hardware to the
 		environment.  These will be named board_name, board_rev.
 
+		CONFIG_DELAY_ENVIRONMENT
+
+		Normally the environment is loaded when the board is
+		intialised so that it is available to U-Boot. This inhibits
+		that so that the environment is not available until
+		explicitly loaded later by U-Boot code. With CONFIG_OF_CONTROL
+		this is instead controlled by the value of
+		/config/load-environment.
+
 - DataFlash Support:
 		CONFIG_HAS_DATAFLASH