linux-kernel - [PATCH v2 1/3] params: Fix the maximum length in param_get

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Date:   Thu, 28 Sep 2017 16:25:15 +0200
From:   Jean Delvare <jdelvare@...e.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>, Baoquan He <bhe@...hat.com>,
        Michal Hocko <mhocko@...e.com>
Subject: [PATCH v2 1/3] params: Fix the maximum length in param_get_string

The length parameter of strlcpy() is supposed to reflect the size of
the target buffer, not of the source string. Harmless in this case as
the buffer is PAGE_SIZE long and the source string is always much
shorter than this, but conceptually wrong, so let's fix it.

Signed-off-by: Jean Delvare <jdelvare@...e.de>
---
Changes since v1:
* Patch added

 kernel/params.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-4.13.orig/kernel/params.c	2017-09-28 11:09:09.604089430 +0200
+++ linux-4.13/kernel/params.c	2017-09-28 11:09:47.573434740 +0200
@@ -507,7 +507,7 @@ EXPORT_SYMBOL(param_set_copystring);
 int param_get_string(char *buffer, const struct kernel_param *kp)
 {
 	const struct kparam_string *kps = kp->str;
-	return strlcpy(buffer, kps->string, kps->maxlen);
+	return strlcpy(buffer, kps->string, PAGE_SIZE);
 }
 EXPORT_SYMBOL(param_get_string);
 

-- 
Jean Delvare
SUSE L3 Support