linux-kernel - Re: [PATCH 0/2] LoongArch: Make bounds-checking instructions useful

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Message-ID: <CAAhV-H6PfjkYPYsBEzHY5i=74-tyqSHCRC65Fbz3O0Jaggypmg@mail.gmail.com>
Date:   Sat, 22 Apr 2023 16:39:55 +0800
From:   Huacai Chen <chenhuacai@...nel.org>
To:     WANG Xuerui <kernel@...0n.name>
Cc:     Xi Ruoyao <xry111@...111.site>, loongarch@...ts.linux.dev,
        WANG Xuerui <git@...0n.name>,
        Eric Biederman <ebiederm@...ssion.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>, linux-api@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] LoongArch: Make bounds-checking instructions useful

On Thu, Apr 20, 2023 at 5:38 PM WANG Xuerui <kernel@...0n.name> wrote:
>
> On 2023/4/20 16:36, Huacai Chen wrote:
> > Hi, Xuerui,
> >
> > I hope V2 can be applied cleanly without the patch series "LoongArch:
> > Better backtraces", thanks.
>
> I believe it's already the case (just try; I've moved the BADV printing
> for BCE into the better backtraces series before sending this).
>
> I'm only waiting for comments from the other UAPI maintainers on the CC
> list.
You changed arch/loongarch/include/asm/kdebug.h, does it have
something to do with UAPI?
On the other hand, kprobe has dropped the notifier mechanism, so this
piece should be changed, I think.

+ /*
+ * notify the kprobe handlers, if instruction is likely to
+ * pertain to them.
+ */
+ if (notify_die(DIE_BOUNDS_CHECK, "Bounds check error", regs, 0,
+       current->thread.trap_nr, SIGSEGV) == NOTIFY_STOP)
+ goto out;

Huacai

>
> --
> WANG "xen0n" Xuerui
>
> Linux/LoongArch mailing list: https://lore.kernel.org/loongarch/
>