netdev - Re: [PATCH bpf-next v3 1/4] x86/ibt: factor out cfi and fineibt offset

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Message-ID: <CADxym3as+KdeBMUigq4xq302g2U7UG-7Gm+vKiYGnSjHouq=bg@mail.gmail.com>
Date: Mon, 3 Mar 2025 18:51:41 +0800
From: Menglong Dong <menglong8.dong@...il.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: rostedt@...dmis.org, mark.rutland@....com, alexei.starovoitov@...il.com, 
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Subject: Re: [PATCH bpf-next v3 1/4] x86/ibt: factor out cfi and fineibt offset

On Mon, Mar 3, 2025 at 5:18 PM Peter Zijlstra <peterz@...radead.org> wrote:
>
> On Mon, Mar 03, 2025 at 02:53:42PM +0800, Menglong Dong wrote:
> > index c71b575bf229..ad050d09cb2b 100644
> > --- a/arch/x86/kernel/alternative.c
> > +++ b/arch/x86/kernel/alternative.c
> > @@ -908,7 +908,7 @@ void __init_or_module noinline apply_seal_endbr(s32 *start, s32 *end, struct mod
> >
> >               poison_endbr(addr, wr_addr, true);
> >               if (IS_ENABLED(CONFIG_FINEIBT))
> > -                     poison_cfi(addr - 16, wr_addr - 16);
> > +                     poison_cfi(addr, wr_addr);
> >       }
> >  }
>
> If you're touching this code, please use tip/x86/core or tip/master.

Thank you for reminding me that, I were using the linux-next, and
I notice that you just did some optimization to the FINEIBT :/

I'll send a V4 later, based on the tip/x86/core.

Thanks!
Menglong Dong