linux-kernel - Re: [PATCH] lkdtm: use the return value of strim()

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Message-ID: <2023082228-breath-submitter-7a1e@gregkh>
Date:   Tue, 22 Aug 2023 14:03:46 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     "GONG, Ruiqi" <gongruiqi@...weicloud.com>
Cc:     Kees Cook <keescook@...omium.org>, Arnd Bergmann <arnd@...db.de>,
        linux-kernel@...r.kernel.org, gongruiqi1@...wei.com
Subject: Re: [PATCH] lkdtm: use the return value of strim()

On Thu, Aug 17, 2023 at 10:21:17PM +0800, GONG, Ruiqi wrote:
> From: "GONG, Ruiqi" <gongruiqi1@...wei.com>
> 
> Make use of the return value of strim() to achieve left-trim as well as
> right-trim, which prevents the following unusual fail case:
> 
>  # echo " EXCEPTION" > /sys/kernel/debug/provoke-crash/DIRECT
>  sh: write error: Invalid argument

And that is correct, don't use leading whitespace, the kernel is not
there to parse it away :)

thanks,

greg k-h