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authorMarco Elver <elver@google.com>2020-04-10 18:44:18 +0200
committerPaul E. McKenney <paulmck@kernel.org>2020-04-14 02:18:16 +0200
commitcdb9b07d8c78be63d72aba9a2686ff161ddd2099 (patch)
tree2383bfd37fc324be963fcdb297158ffb0493974f /kernel/kcsan
parentkcsan: Fix function matching in report (diff)
downloadlinux-cdb9b07d8c78be63d72aba9a2686ff161ddd2099.tar.xz
linux-cdb9b07d8c78be63d72aba9a2686ff161ddd2099.zip
kcsan: Make reporting aware of KCSAN tests
Reporting hides KCSAN runtime functions in the stack trace, with filtering done based on function names. Currently this included all functions (or modules) that would match "kcsan_". Make the filter aware of KCSAN tests, which contain "kcsan_test", and are no longer skipped in the report. This is in preparation for adding a KCSAN test module. Signed-off-by: Marco Elver <elver@google.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/kcsan')
-rw-r--r--kernel/kcsan/report.c30
1 files changed, 23 insertions, 7 deletions
diff --git a/kernel/kcsan/report.c b/kernel/kcsan/report.c
index cf41d63dd0cd..ac5f8345bae9 100644
--- a/kernel/kcsan/report.c
+++ b/kernel/kcsan/report.c
@@ -262,16 +262,32 @@ static const char *get_thread_desc(int task_id)
static int get_stack_skipnr(const unsigned long stack_entries[], int num_entries)
{
char buf[64];
- int len;
- int skip = 0;
+ char *cur;
+ int len, skip;
- for (; skip < num_entries; ++skip) {
+ for (skip = 0; skip < num_entries; ++skip) {
len = scnprintf(buf, sizeof(buf), "%ps", (void *)stack_entries[skip]);
- if (!strnstr(buf, "csan_", len) &&
- !strnstr(buf, "tsan_", len) &&
- !strnstr(buf, "_once_size", len))
- break;
+
+ /* Never show tsan_* or {read,write}_once_size. */
+ if (strnstr(buf, "tsan_", len) ||
+ strnstr(buf, "_once_size", len))
+ continue;
+
+ cur = strnstr(buf, "kcsan_", len);
+ if (cur) {
+ cur += sizeof("kcsan_") - 1;
+ if (strncmp(cur, "test", sizeof("test") - 1))
+ continue; /* KCSAN runtime function. */
+ /* KCSAN related test. */
+ }
+
+ /*
+ * No match for runtime functions -- @skip entries to skip to
+ * get to first frame of interest.
+ */
+ break;
}
+
return skip;
}