[PATCH 3/3] livepatch: Use FTRACE_OPS_FL_PERMANENT
From: Miroslav Benes <mbenes@suse.cz>
Date: 2019-10-07 08:17:26
Also in:
lkml
Subsystem:
live patching, the rest · Maintainers:
Josh Poimboeuf, Jiri Kosina, Miroslav Benes, Petr Mladek, Linus Torvalds
Use FTRACE_OPS_FL_PERMANENT flag to be immune to toggling the 'ftrace_enabled' sysctl knob. Signed-off-by: Miroslav Benes <mbenes@suse.cz> --- kernel/livepatch/patch.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/livepatch/patch.c b/kernel/livepatch/patch.c
index bd43537702bd..b552cf2d85f8 100644
--- a/kernel/livepatch/patch.c
+++ b/kernel/livepatch/patch.c@@ -196,7 +196,8 @@ static int klp_patch_func(struct klp_func *func) ops->fops.func = klp_ftrace_handler; ops->fops.flags = FTRACE_OPS_FL_SAVE_REGS | FTRACE_OPS_FL_DYNAMIC | - FTRACE_OPS_FL_IPMODIFY; + FTRACE_OPS_FL_IPMODIFY | + FTRACE_OPS_FL_PERMANENT; list_add(&ops->node, &klp_ops);
--
2.23.0