kprobes: return proper error code from register_kprobe()

register_kprobe() aborts if the address of the new request falls in a
prohibited area (such as ftrace pouch, __kprobes annotated functions,
non-kernel text addresses, jump label text).  We however don't return the
right error on this abort, resulting in a silent failure - incorrect
adding/reporting of kprobes ('perf probe do_fork+18' or 'perf probe
mcount' for instance).

In V2 we are incorporating Masami Hiramatsu's  feedback.

This patch fixes it by returning -EINVAL upon failure.

While we are here, rename the label used for exit to be more appropriate.

Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Signed-off-by: Prashanth K Nageshappa <prashanth@linux.vnet.ibm.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 5 deletions

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 9788c0ec6f43..c62b8546cc90 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1334,8 +1334,10 @@ int __kprobes register_kprobe(struct kprobe *p)
         if (!kernel_text_address((unsigned long) p->addr) ||
             in_kprobes_functions((unsigned long) p->addr) ||
             ftrace_text_reserved(p->addr, p->addr) ||
-            jump_label_text_reserved(p->addr, p->addr))
-                goto fail_with_jump_label;
+            jump_label_text_reserved(p->addr, p->addr)) {
+                ret = -EINVAL;
+                goto cannot_probe;
+        }
 
         /* User can pass only KPROBE_FLAG_DISABLED to register_kprobe */
         p->flags &= KPROBE_FLAG_DISABLED;
@@ -1352,7 +1354,7 @@ int __kprobes register_kprobe(struct kprobe *p)
                  * its code to prohibit unexpected unloading.
                  */
                 if (unlikely(!try_module_get(probed_mod)))
-                        goto fail_with_jump_label;
+                        goto cannot_probe;
 
                 /*
                  * If the module freed .init.text, we couldn't insert
@@ -1361,7 +1363,7 @@ int __kprobes register_kprobe(struct kprobe *p)
                 if (within_module_init((unsigned long)p->addr, probed_mod) &&
                     probed_mod->state != MODULE_STATE_COMING) {
                         module_put(probed_mod);
-                        goto fail_with_jump_label;
+                        goto cannot_probe;
                 }
                 /* ret will be updated by following code */
         }
@@ -1409,7 +1411,7 @@ out:
 
         return ret;
 
-fail_with_jump_label:
+cannot_probe:
         preempt_enable();
         jump_label_unlock();
         return ret;