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-rw-r--r--samples/livepatch/livepatch-sample.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/samples/livepatch/livepatch-sample.c b/samples/livepatch/livepatch-sample.c
index e34f871e69b1..629e0dca0887 100644
--- a/samples/livepatch/livepatch-sample.c
+++ b/samples/livepatch/livepatch-sample.c
@@ -17,6 +17,8 @@
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/livepatch.h>
@@ -69,6 +71,21 @@ static int livepatch_init(void)
{
int ret;
+ if (!klp_have_reliable_stack() && !patch.immediate) {
+ /*
+ * WARNING: Be very careful when using 'patch.immediate' in
+ * your patches. It's ok to use it for simple patches like
+ * this, but for more complex patches which change function
+ * semantics, locking semantics, or data structures, it may not
+ * be safe. Use of this option will also prevent removal of
+ * the patch.
+ *
+ * See Documentation/livepatch/livepatch.txt for more details.
+ */
+ patch.immediate = true;
+ pr_notice("The consistency model isn't supported for your architecture. Bypassing safety mechanisms and applying the patch immediately.\n");
+ }
+
ret = klp_register_patch(&patch);
if (ret)
return ret;