If fprobe_entry does not fill the allocated fgraph_data completely, the unused part does not have to be zeroed.
fgraph_data is a short-lived part of the shadow stack. The preceding length field allows locating the end regardless of the content. Signed-off-by: Martin Kaiser <[email protected]> --- v2: - remove the memset instead of fixing the length kernel/trace/fprobe.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/kernel/trace/fprobe.c b/kernel/trace/fprobe.c index dcadf1d23b8a..56d145017902 100644 --- a/kernel/trace/fprobe.c +++ b/kernel/trace/fprobe.c @@ -450,8 +450,6 @@ static int fprobe_fgraph_entry(struct ftrace_graph_ent *trace, struct fgraph_ops used += FPROBE_HEADER_SIZE_IN_LONG + size_words; } } - if (used < reserved_words) - memset(fgraph_data + used, 0, reserved_words - used); /* If any exit_handler is set, data must be used. */ return used != 0; -- 2.43.7
