The following commit has been merged into the locking/kcsan branch of tip:
Commit-ID: f770ed10a9ee65529f3ec8d90eb374bbd8b7c238
Gitweb: https://git.kernel.org/tip/f770ed10a9ee65529f3ec8d90eb374bbd8b7c238
Author: Marco Elver <elver@xxxxxxxxxx>
AuthorDate: Fri, 10 Apr 2020 18:44:17 +02:00
Committer: Paul E. McKenney <paulmck@xxxxxxxxxx>
CommitterDate: Mon, 13 Apr 2020 17:18:15 -07:00
kcsan: Fix function matching in report
Pass string length as returned by scnprintf() to strnstr(), since
strnstr() searches exactly len bytes in haystack, even if it contains a
NUL-terminator before haystack+len.
Signed-off-by: Marco Elver <elver@xxxxxxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
---
kernel/kcsan/report.c | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)
diff --git a/kernel/kcsan/report.c b/kernel/kcsan/report.c
index ddc18f1..cf41d63 100644
--- a/kernel/kcsan/report.c
+++ b/kernel/kcsan/report.c
@@ -192,11 +192,11 @@ skip_report(enum kcsan_value_change value_change, unsigned long top_frame)
* maintainers.
*/
char buf[64];
+ int len = scnprintf(buf, sizeof(buf), "%ps", (void *)top_frame);
- snprintf(buf, sizeof(buf), "%ps", (void *)top_frame);
- if (!strnstr(buf, "rcu_", sizeof(buf)) &&
- !strnstr(buf, "_rcu", sizeof(buf)) &&
- !strnstr(buf, "_srcu", sizeof(buf)))
+ if (!strnstr(buf, "rcu_", len) &&
+ !strnstr(buf, "_rcu", len) &&
+ !strnstr(buf, "_srcu", len))
return true;
}
@@ -262,15 +262,15 @@ 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;
for (; skip < num_entries; ++skip) {
- snprintf(buf, sizeof(buf), "%ps", (void *)stack_entries[skip]);
- if (!strnstr(buf, "csan_", sizeof(buf)) &&
- !strnstr(buf, "tsan_", sizeof(buf)) &&
- !strnstr(buf, "_once_size", sizeof(buf))) {
+ 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;
- }
}
return skip;
}
|