feat(security): add support for SLS mitigation
This patch enables support for the gcc compiler option "-mharden-sls",
the default is not to use this option. Setting HARDEN_SLS=1 sets
"-mharden-sls=all" that enables all hardening against straight line
speculation.
Signed-off-by: Bipin Ravi <bipin.ravi@arm.com>
Change-Id: I59f5963c22431571f5aebe7e0c5642b32362f4c9
(cherry picked from commit 538516f5d3db6e2c30dfa9f0b82859389f529e78)
diff --git a/docs/getting_started/build-options.rst b/docs/getting_started/build-options.rst
index 3ebdbcc..d80a97f 100644
--- a/docs/getting_started/build-options.rst
+++ b/docs/getting_started/build-options.rst
@@ -671,6 +671,19 @@
This option defaults to 0.
+- ``HARDEN_SLS``: used to pass -mharden-sls=all from the TF-A build
+ options to the compiler currently supporting only of the options.
+ GCC documentation:
+ https://gcc.gnu.org/onlinedocs/gcc/AArch64-Options.html#index-mharden-sls
+
+ An example usage:
+
+ .. code:: make
+
+ HARDEN_SLS := 1
+
+ This option defaults to 0.
+
- ``NON_TRUSTED_WORLD_KEY``: This option is used when ``GENERATE_COT=1``. It
specifies the file that contains the Non-Trusted World private key in PEM
format. If ``SAVE_KEYS=1``, this file name will be used to save the key.