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authorAlison Schofield <alison.schofield@intel.com>2022-08-29 10:10:48 -0700
committerSteven Rostedt (Google) <rostedt@goodmis.org>2022-09-06 22:26:00 -0400
commit54be5509422ebee333709c92441aa7185ca182fa (patch)
treeec5b01590969f3c0d2db1012b51bda69884eeb9d /kernel
parentf72c3a2d344b3933dedd42fdaf7d3e1aa4b8cce1 (diff)
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')
-rw-r--r--kernel/tracepoint.c5
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;