tracing: Have trace event string test handle zero length strings

commit eca344a7362e0f34f179298fd8366bcd556eede1 upstream.

If a trace event has in its TP_printk():

 "%*.s", len, len ? __get_str(string) : NULL

It is perfectly valid if len is zero and passing in the NULL.
Unfortunately, the runtime string check at time of reading the trace sees
the NULL and flags it as a bad string and produces a WARN_ON().

Handle this case by passing into the test function if the format has an
asterisk (star) and if so, if the length is zero, then mark it as safe.

Link: https://lore.kernel.org/all/YjsWzuw5FbWPrdqq@bfoster/
Cc: stable@vger.kernel.org
Reported-by: Brian Foster <bfoster@redhat.com>
Tested-by: Brian Foster <bfoster@redhat.com>
Fixes: 9a6944fee68e2 ("tracing: Add a verifier to check string pointers for trace events")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 01002656f1ae98c45ebd73335ee73bcaa24c75b2..b49756608f838eb8cd6cead61dbd49e4e9cbdf9a 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3678,12 +3678,17 @@ static char *trace_iter_expand_format(struct trace_iterator *iter)
 }
 
 /* Returns true if the string is safe to dereference from an event */
-static bool trace_safe_str(struct trace_iterator *iter, const char *str)
+static bool trace_safe_str(struct trace_iterator *iter, const char *str,
+                          bool star, int len)
 {
        unsigned long addr = (unsigned long)str;
        struct trace_event *trace_event;
        struct trace_event_call *event;
 
+       /* Ignore strings with no length */
+       if (star && !len)
+               return true;
+
        /* OK if part of the event data */
        if ((addr >= (unsigned long)iter->ent) &&
            (addr < (unsigned long)iter->ent + iter->ent_size))
@@ -3869,7 +3874,7 @@ void trace_check_vprintf(struct trace_iterator *iter, const char *fmt,
                 * instead. See samples/trace_events/trace-events-sample.h
                 * for reference.
                 */
-               if (WARN_ONCE(!trace_safe_str(iter, str),
+               if (WARN_ONCE(!trace_safe_str(iter, str, star, len),
                              "fmt: '%s' current_buffer: '%s'",
                              fmt, show_buffer(&iter->seq))) {
                        int ret;