From:   Tiezhu Yang <yangtiezhu@loongson.cn>
To:     Steven Rostedt <rostedt@goodmis.org>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        naveen.n.rao@linux.ibm.com, anil.s.keshavamurthy@intel.com,
        davem@davemloft.net
Cc:     linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] kprobes: Replace memcpy() with direct assignment
Date:   Tue, 31 Jan 2023 20:01:50 +0800
Message-Id: <1675166510-7798-1-git-send-email-yangtiezhu@loongson.cn>
Precedence: bulk

Just do a direct assignment, then give a chance to probe memcpy()
for some archs or kernel versions which do not blacklist memcpy().

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
 kernel/kprobes.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 1c18ecf..5a3cf9f 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -407,8 +407,8 @@ static inline bool kprobe_unused(struct kprobe *p)
 /* Keep all fields in the kprobe consistent. */
 static inline void copy_kprobe(struct kprobe *ap, struct kprobe *p)
 {
-	memcpy(&p->opcode, &ap->opcode, sizeof(kprobe_opcode_t));
-	memcpy(&p->ainsn, &ap->ainsn, sizeof(struct arch_specific_insn));
+	p->opcode = ap->opcode;
+	p->ainsn = ap->ainsn;
 }
 
 #ifdef CONFIG_OPTPROBES
-- 
2.1.0