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| author | Alison Schofield <alison.schofield@intel.com> | 2022-08-29 10:10:48 -0700 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2022-09-06 22:26:00 -0400 |
| commit | 54be5509422ebee333709c92441aa7185ca182fa (patch) | |
| tree | ec5b01590969f3c0d2db1012b51bda69884eeb9d /kernel/tracepoint.c | |
| parent | f72c3a2d344b3933dedd42fdaf7d3e1aa4b8cce1 (diff) | |
| download | linux-54be5509422ebee333709c92441aa7185ca182fa.tar.gz linux-54be5509422ebee333709c92441aa7185ca182fa.tar.bz2 linux-54be5509422ebee333709c92441aa7185ca182fa.zip | |
tracepoint: Allow trace events in modules with TAINT_TEST
Commit 2852ca7fba9f ("panic: Taint kernel if tests are run")
introduced a new taint type, TAINT_TEST, to signal that an
in-kernel test module has been loaded.
TAINT_TEST taint type defaults into a 'bad_taint' list for
kernel tracing and blocks the creation of trace events. This
causes a problem for CXL testing where loading the cxl_test
module makes all CXL modules out-of-tree, blocking any trace
events.
Trace events are in development for CXL at the moment and this
issue was found in test with v6.0-rc1.
Link: https://lkml.kernel.org/r/20220829171048.263065-1-alison.schofield@intel.com
Fixes: 2852ca7fba9f7 ("panic: Taint kernel if tests are run")
Reported-by: Ira Weiny <ira.weiny@intel.com>
Suggested-by: Dan Williams <dan.j.williams@intel.com>
Tested-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: David Gow <davidgow@google.com>
Signed-off-by: Alison Schofield <alison.schofield@intel.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/tracepoint.c')
| -rw-r--r-- | kernel/tracepoint.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c index 64ea283f2f86..ef42c1a11920 100644 --- a/kernel/tracepoint.c +++ b/kernel/tracepoint.c @@ -571,7 +571,8 @@ static void for_each_tracepoint_range( bool trace_module_has_bad_taint(struct module *mod) { return mod->taints & ~((1 << TAINT_OOT_MODULE) | (1 << TAINT_CRAP) | - (1 << TAINT_UNSIGNED_MODULE)); + (1 << TAINT_UNSIGNED_MODULE) | + (1 << TAINT_TEST)); } static BLOCKING_NOTIFIER_HEAD(tracepoint_notify_list); @@ -647,7 +648,7 @@ static int tracepoint_module_coming(struct module *mod) /* * We skip modules that taint the kernel, especially those with different * module headers (for forced load), to make sure we don't cause a crash. - * Staging, out-of-tree, and unsigned GPL modules are fine. + * Staging, out-of-tree, unsigned GPL, and test modules are fine. */ if (trace_module_has_bad_taint(mod)) return 0; |