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Re: [PATCH] Linux/x86: Support shadow stack pointer in setjmp/longjmp

On Tue, Dec 19, 2017 at 10:18 AM, Zack Weinberg <> wrote:
> On Tue, Dec 19, 2017 at 8:41 AM, H.J. Lu <> wrote:
>>>> That doesn't seem to be one of the patches you listed as a dependency of
>>>> this one.  Does that not matter because __SHSTK__ can never be defined
>>>> when building glibc unless that other patch is in glibc?
>>> I submitted the setjmp patch to show how backward binary compatibility
>>> is preserved.   Yes, setjmp is unchanged if we aren't building glibc with
>>> CET enabled, which will be done in a separate patch.
>> As I mentioned, we need room in jmp_buf to save and restore shadow stack
>> pointer in setjmp/longjmp.  Since only Linux/x86 jmp_buf has a space for
>> shadow stack pointer, this setjmp/longjmp patch is only for Linux/x86.
>> I am checking it in today.
> I don't think you have consensus. You haven't answered most of
> Joseph's questions, and it is not clear to me whether Florian
> considers his objection resolved.  This is not a high-priority bugfix.

I have answered all questions.   Please show one question which I haven't

> Please stop trying to rush it in.
> zw


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