linux-kernel - Re: [PATCH] sysctl: Check length at deprecated_sysctl

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Message-Id: <200711130350.lAD3oWnt054039@www262.sakura.ne.jp>
Date:	Tue, 13 Nov 2007 12:50:32 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	ebiederm@...ssion.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sysctl: Check length at deprecated_sysctl_warning.

Hello.

Andrew Morton wrote:
> I believe (args->nlen > CTL_MAXNAME) was correct.
I'll leave it to you.
But if you want to allow args->nlen == CTL_MAXNAME,
you also need to update do_sysctl().

int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
               void __user *newval, size_t newlen)
{
        ...
        if (nlen <= 0 || nlen >= CTL_MAXNAME)
                return -ENOTDIR;
        ...
}

Thanks.
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