Re: [PATCH] kernel/sysctl.c: If "count" including the terminating byte '\0' the write system call should retrun success.

From: Sean Fu
Date: Wed Aug 26 2015 - 11:48:14 EST

On Wed, Aug 26, 2015 at 3:05 AM, Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
> On Tue, 25 Aug 2015 13:33:57 -0400
> Austin S Hemmelgarn <ahferroin7@xxxxxxxxx> wrote:
>> >> How do you know that?
>> > I will prove that all other write usage is not impacted later.
>> Except that you can only really do this for programs that you have
>> access to, and by definition you can not have access to every program
>> ever written that writes to /proc.
>> If you were going to do this, it would need to be itself controlled by
>> another sysctl to toggle the behavior, which would need to default to
>> the current behavior.
> Defending the patch, I can't imagine any user space code expecting the
> current behavior. The current behavior is that if you write "1\0" it
> will error out instead of accepting the "1". I can't come up with a
> scenario that would require userspace to expect "1\0" to fail. Can you?
> -- Steve
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