linux-kernel - [PATCH linux-next] x86/platform/uv: use strscpy to instead of strncpy()

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Message-ID: <202212031424175433783@zte.com.cn>
Date:   Sat, 3 Dec 2022 14:24:17 +0800 (CST)
From:   <yang.yang29@....com.cn>
To:     <steve.wahl@....com>
Cc:     <mike.travis@....com>, <dimitri.sivanich@....com>,
        <russ.anderson@....com>, <dvhart@...radead.org>,
        <andy@...radead.org>, <tglx@...utronix.de>, <mingo@...hat.com>,
        <bp@...en8.de>, <dave.hansen@...ux.intel.com>, <x86@...nel.org>,
        <hpa@...or.com>, <platform-driver-x86@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <xu.panda@....com.cn>,
        <yang.yang29@....com.cn>
Subject: [PATCH linux-next] x86/platform/uv: use strscpy to instead of strncpy()

From: Xu Panda <xu.panda@....com.cn>

The implementation of strscpy() is more robust and safer.
That's now the recommended way to copy NUL terminated strings.

Signed-off-by: Xu Panda <xu.panda@....com.cn>
Signed-off-by: Yang Yang <yang.yang29@....com>
---
 arch/x86/platform/uv/uv_nmi.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/x86/platform/uv/uv_nmi.c b/arch/x86/platform/uv/uv_nmi.c
index a60af0230e27..1b0c8062c731 100644
--- a/arch/x86/platform/uv/uv_nmi.c
+++ b/arch/x86/platform/uv/uv_nmi.c
@@ -205,8 +205,7 @@ static int param_set_action(const char *val, const struct kernel_param *kp)
 	char arg[ACTION_LEN], *p;

 	/* (remove possible '\n') */
-	strncpy(arg, val, ACTION_LEN - 1);
-	arg[ACTION_LEN - 1] = '\0';
+	strscpy(arg, val, ACTION_LEN - 1);
 	p = strchr(arg, '\n');
 	if (p)
 		*p = '\0';
@@ -959,7 +958,7 @@ static int uv_handle_nmi(unsigned int reason, struct pt_regs *regs)

 		/* Unexpected return, revert action to "dump" */
 		if (master)
-			strncpy(uv_nmi_action, "dump", strlen(uv_nmi_action));
+			strscpy(uv_nmi_action, "dump", strlen(uv_nmi_action));
 	}

 	/* Pause as all CPU's enter the NMI handler */
-- 
2.15.2