x86: kprobes: add kprobes smoke tests that run on boot

Here is a quick and naive smoke test for kprobes. This is intended to
just verify if some unrelated change broke the *probes subsystem. It is
self contained, architecture agnostic and isn't of any great use by itself.

This needs to be built in the kernel and runs a basic set of tests to
verify if kprobes, jprobes and kretprobes run fine on the kernel. In case
of an error, it'll print out a message with a "BUG" prefix.

This is a start; we intend to add more tests to this bucket over time.

Thanks to Jim Keniston and Masami Hiramatsu for comments and suggestions.

Tested on x86 (32/64) and powerpc.

Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Acked-by: Masami Hiramatsu <mhiramat@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 12 insertions, 0 deletions

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index c4ecb2994ba3..f535b9b5eb00 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -494,6 +494,18 @@ config RCU_TORTURE_TEST
           Say M if you want the RCU torture tests to build as a module.
           Say N if you are unsure.
 
+config KPROBES_SANITY_TEST
+        bool "Kprobes sanity tests"
+        depends on DEBUG_KERNEL
+        depends on KPROBES
+        default n
+        help
+          This option provides for testing basic kprobes functionality on
+          boot. A sample kprobe, jprobe and kretprobe are inserted and
+          verified for functionality.
+
+          Say N if you are unsure.
+
 config LKDTM
         tristate "Linux Kernel Dump Test Tool Module"
         depends on DEBUG_KERNEL