error-injection: Fix to prohibit jump optimization

Since the kprobe which was optimized by jump can not change
the execution path, the kprobe for error-injection must not
be optimized. To prohibit it, set a dummy post-handler as
officially stated in Documentation/kprobes.txt.

Fixes: 4b1a29a7f542 ("error-injection: Support fault injection framework")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

diff --git a/kernel/fail_function.c b/kernel/fail_function.c
index 21b0122..1d5632d 100644 (file)
--- a/kernel/fail_function.c
+++ b/kernel/fail_function.c
@@ -14,6 +14,15 @@
 
 static int fei_kprobe_handler(struct kprobe *kp, struct pt_regs *regs);
 
+static void fei_post_handler(struct kprobe *kp, struct pt_regs *regs,
+                            unsigned long flags)
+{
+       /*
+        * A dummy post handler is required to prohibit optimizing, because
+        * jump optimization does not support execution path overriding.
+        */
+}
+
 struct fei_attr {
        struct list_head list;
        struct kprobe kp;
@@ -56,6 +65,7 @@ static struct fei_attr *fei_attr_new(const char *sym, unsigned long addr)
                        return NULL;
                }
                attr->kp.pre_handler = fei_kprobe_handler;
+               attr->kp.post_handler = fei_post_handler;
                attr->retval = adjust_error_retval(addr, 0);
                INIT_LIST_HEAD(&attr->list);
        }