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Message-ID: <202212091545310085328@zte.com.cn>
Date: Fri, 9 Dec 2022 15:45:31 +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>, <andy.shevchenko@...il.com>
Subject: [PATCH linux-next v3] 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>
---
change for v3
- remove the remaining definition of p, and fix the mistake
which leads to eating one character. Thanks to Andy Shevchenko again.
---
arch/x86/platform/uv/uv_nmi.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/arch/x86/platform/uv/uv_nmi.c b/arch/x86/platform/uv/uv_nmi.c
index a60af0230e27..a55550b779e1 100644
--- a/arch/x86/platform/uv/uv_nmi.c
+++ b/arch/x86/platform/uv/uv_nmi.c
@@ -202,14 +202,10 @@ static int param_set_action(const char *val, const struct kernel_param *kp)
{
int i;
int n = ARRAY_SIZE(valid_acts);
- char arg[ACTION_LEN], *p;
+ char arg[ACTION_LEN];
/* (remove possible '\n') */
- strncpy(arg, val, ACTION_LEN - 1);
- arg[ACTION_LEN - 1] = '\0';
- p = strchr(arg, '\n');
- if (p)
- *p = '\0';
+ strscpy(arg, val, strnchrnul(val, ACTION_LEN - 1, '\n') - val + 1);
for (i = 0; i < n; i++)
if (!strcmp(arg, valid_acts[i].action))
--
2.15.2
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