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tracing: fprobe: do not zero out unused fgraph_data

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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.

Link: https://lore.kernel.org/all/20260324084804.375764-1-martin@kaiser.cx/

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
This commit is contained in:
Martin Kaiser 2026-03-25 00:47:01 +09:00 committed by Masami Hiramatsu (Google)
parent c369299895
commit e0a384434a
1 changed files with 0 additions and 2 deletions
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2
kernel/trace/fprobe.c
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@ -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;