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Linux Kernel Live Patching infrastructure tests

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Name		Name	Last commit message	Last commit date
Latest commit History 69 Commits
hiworkload		hiworkload
COPYING		COPYING
README		README
klp_compile_test_hrtimer.c		klp_compile_test_hrtimer.c
klp_tc_10.sh		klp_tc_10.sh
klp_tc_11-faulting_cat.c		klp_tc_11-faulting_cat.c
klp_tc_11.sh		klp_tc_11.sh
klp_tc_12.sh		klp_tc_12.sh
klp_tc_13.sh		klp_tc_13.sh
klp_tc_14.sh		klp_tc_14.sh
klp_tc_15.sh		klp_tc_15.sh
klp_tc_16.sh		klp_tc_16.sh
klp_tc_17.sh		klp_tc_17.sh
klp_tc_3-call_getpid.c		klp_tc_3-call_getpid.c
klp_tc_3.sh		klp_tc_3.sh
klp_tc_5.sh		klp_tc_5.sh
klp_tc_6.sh		klp_tc_6.sh
klp_tc_7.sh		klp_tc_7.sh
klp_tc_8.sh		klp_tc_8.sh
klp_tc_functions.sh		klp_tc_functions.sh
klp_tc_workload.sh		klp_tc_workload.sh
klp_test_livepatch.c		klp_test_livepatch.c
klp_test_support_mod.c		klp_test_support_mod.c
klp_test_support_mod.h		klp_test_support_mod.h
run.sh		run.sh

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Shell scripts to stress Linux Kernel Live Patching infrastructure. These
scripts try to induce a few stressful situations for the live patching
infrastructure in the hope of making bugs creep out of their hideouts.

Brief test case description
---------------------------

TC3 Patch under pressure (already tested on kselftests)
    * Patch a heavily hammered function in kernel.

TC5 Test kernel live patching in quick succession
    * Apply one patch after another in quick succession.

TC6 Patch while CPUs are busy
    * Make CPUs busy in user space and patch.

TC7 Test kernel live patching in low-memory condition
    * Run a workload that will bring the system close to OOM and then start
      patching.
    * Requires hiworkload (needs to be compiled).

TC8 Patch with replace-all (already tested on kselftests)
    * Make sure "replace-all" KLP function works as expected.

TC10 Patch caller of graph traced callee
    * Check that the reliable stacktrace implementation is able to
      discover callers of graph traced functions.

TC11 Patch function sleeping in a fault
    * Make sure that a patch to function sleeping in a fault exception
      gets blocked.

TC12 Patch caller of kretprobed callee
    * Check that the reliable stacktrace implementation is able to
      discover callers of functions with a kretprobe on them.

TC13 Patch traced function
    * Patch a function which is being traced and check that the live
      patch really is in effect.

TC14 Trace patched function
    * Trace a patched function and check that the live patch remains
      in effect.

TC15 Patch graph-traced function
    * Patch a function which is being graph-traced and check that the
      live patch really is in effect.

TC16 Graph-trace patched function
    * Graph-trace a patched function and check that the live patch
      remains in effect.

TC17 Check that patching a kprobed function fails (already tested on ksefltests)
    * Patch a function with a kprobe on it and check that the live
      patch fails to load: kprobes' and live patching ftrace_ops both
      have FTRACE_OPS_FL_IPMODIFY set.

Supported platforms
-------------------

This test suite is supported and regularly tested on:

* SUSE Linux Enterprise 12 SP4 and newer
* SUSE Linux Enterprise 15 GA and newer
* openSUSE Tumbleweed

Following distros are supported in the sense that there is intention to allow
running qa_test_klp on them but there may be no regular testing done on these
distros. If anything is broken in this area, we welcome bug reports and
patches.

* Debian 10 and newer
* Fedora 31 and newer
* openSUSE Leap 15.1 and newer

Supported hardware architectures include **x86_64/amd64**, **ppc64le** and
**s390x**.