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Date: Sat, 03 Jun 2017 13:32:35 -0400
From: Rik van Riel <riel@...hat.com>
To: Brad Spengler <spender@...ecurity.net>,
kernel-hardening@...ts.openwall.com
Subject: Re: Stop the plagiarism
On Sat, 2017-06-03 at 07:30 -0400, Brad Spengler wrote:
> While I'm here:
> http://openwall.com/lists/kernel-hardening/2017/06/02/3
>
> "a value linux-hardened and grsecurity have used for a long time now"
> Rik, you're giving credit to a project that didn't even exist a
> couple
> weeks ago, yet they've somehow used it "for a long time", even though
CopperheadOS has been around for a few years now, with
a hardened Linux kernel as one of its components.
> it only exists there because it was copy+pasted from grsecurity? Is
> that what we do now, credit plagiarists instead of the actual authors
> of
> the work? Sorry, but the "work" of struggling to understand code
> that
> isn't yours doesn't suddenly make it your code.
The actual code in my patch is different from the #ifdef
stuff in both linux-hardened and grsecurity.
The only thing that is the same is an integer constant.
> This is exactly how your plagiarism works.
If I wanted to do plagiarism, I would have copied the
ugly-as-all-hell #ifdef magic from grsecurity. What
do you think would have happened if I had submitted
something like this to lkml?
#ifdef CONFIG_PAX_SEGMEXEC
#define ELF_ET_DYN_BASE ((current->mm->pax_flags &
MF_PAX_SEGMEXEC) ? SEGMEXEC_TASK_SIZE/3*2 : TASK_SIZE/3*2)
#else
#define ELF_ET_DYN_BASE (TASK_SIZE / 3 * 2)
#endif
#ifdef CONFIG_PAX_ASLR
#ifdef CONFIG_X86_32
#define PAX_ELF_ET_DYN_BASE 0x10000000UL
#define PAX_DELTA_MMAP_LEN (current->mm->pax_flags &
MF_PAX_SEGMEXEC ? 15 : 16)
#define PAX_DELTA_STACK_LEN (current->mm->pax_flags &
MF_PAX_SEGMEXEC ? 15 : 16)
#else
#define PAX_ELF_ET_DYN_BASE 0x400000UL
#define PAX_DELTA_MMAP_LEN ((test_thread_flag(TIF_ADDR32)) ? 16 :
TASK_SIZE_MAX_SHIFT - PAGE_SHIFT - 3)
#define PAX_DELTA_STACK_LEN ((test_thread_flag(TIF_ADDR32)) ? 16 :
TASK_SIZE_MAX_SHIFT - PAGE_SHIFT - 3)
#endif
#endif
Notice how the code in my patch does not look like that,
at all?
> This is your last warning. This is not a new problem and it needs to
> end completely, or I will make sure it ends.
The grsecurity code you published is licensed under the
GPLv2. I would be happy to add your copyright in if I
ever copied around a larger piece of code, but most of
the time the code I end up submitting is a rewrite and
not a copy.
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