tracing: Change synthetic event string format to limit printed length (8db4d6bf) · Commits · 戴 / test

Change the format for printing synthetic field strings to limit the length of the string printed even if it's not correctly terminated. Link: https://lore.kernel.org/r/20201002210036.0200371b@oasis.local.home Link: https://lkml.kernel.org/r/b6bdb34e70d970e8026daa3503db6b8e5cdad524.1601848695.git.zanussi@kernel.org Signed-off-by:

kernel/trace/trace_events_synth.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -234,7 +234,7 @@ static const char synth_field_fmt(char type)
		else if (strcmp(type, "gfp_t") == 0)
		fmt = "%x";
		else if (synth_field_is_string(type))
		fmt = "%s";
		fmt = "%.*s";

		return fmt;
		}
		@@ -303,11 +303,13 @@ static enum print_line_t print_synth_event(struct trace_iterator *iter,
		str_field = (char *)entry + data_offset;

		trace_seq_printf(s, print_fmt, se->fields[i]->name,
		STR_VAR_LEN_MAX,
		str_field,
		i == se->n_fields - 1 ? "" : " ");
		n_u64++;
		} else {
		trace_seq_printf(s, print_fmt, se->fields[i]->name,
		STR_VAR_LEN_MAX,
		(char *)&entry->fields[n_u64],
		i == se->n_fields - 1 ? "" : " ");
		n_u64 += STR_VAR_LEN_MAX / sizeof(u64);