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kcsan: Fix function matching in report

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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@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Marco Elver 2020-04-10 18:44:17 +02:00 committed by Paul E. McKenney
parent d071e91361
commit f770ed10a9
1 changed files with 9 additions and 9 deletions
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18
kernel/kcsan/report.c
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@ -192,11 +192,11 @@ skip_report(enum kcsan_value_change value_change, unsigned long top_frame)
* maintainers. * maintainers.
*/ */
char buf[64]; 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_", len) &&
if (!strnstr(buf, "rcu_", sizeof(buf)) && !strnstr(buf, "_rcu", len) &&
!strnstr(buf, "_rcu", sizeof(buf)) && !strnstr(buf, "_srcu", len))
!strnstr(buf, "_srcu", sizeof(buf)))
return true; 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) static int get_stack_skipnr(const unsigned long stack_entries[], int num_entries)
{ {
char buf[64]; char buf[64];
int len;
int skip = 0; int skip = 0;
for (; skip < num_entries; ++skip) { for (; skip < num_entries; ++skip) {
snprintf(buf, sizeof(buf), "%ps", (void *)stack_entries[skip]); len = scnprintf(buf, sizeof(buf), "%ps", (void *)stack_entries[skip]);
if (!strnstr(buf, "csan_", sizeof(buf)) && if (!strnstr(buf, "csan_", len) &&
!strnstr(buf, "tsan_", sizeof(buf)) && !strnstr(buf, "tsan_", len) &&
!strnstr(buf, "_once_size", sizeof(buf))) { !strnstr(buf, "_once_size", len))
break; break;
}
} }
return skip; return skip;
} }