linux-kernel - Re: [PATCH -tip v8 01/13] ia64: kprobes: Fix to pass correct trampoline address to the handler

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Date:   Mon, 5 Jul 2021 19:05:55 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>, X86 ML <x86@...nel.org>,
        Daniel Xu <dxu@...uu.xyz>, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org, kuba@...nel.org, mingo@...hat.com,
        ast@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>, kernel-team@...com,
        yhs@...com, linux-ia64@...r.kernel.org,
        Abhishek Sagar <sagar.abhishek@...il.com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>
Subject: Re: [PATCH -tip v8 01/13] ia64: kprobes: Fix to pass correct
 trampoline address to the handler

On Mon, 5 Jul 2021 09:46:33 +0200
Ingo Molnar <mingo@...nel.org> wrote:

> 
> * Masami Hiramatsu <mhiramat@...nel.org> wrote:
> 
> > Commit e792ff804f49 ("ia64: kprobes: Use generic kretprobe trampoline handler")
> > missed to pass the wrong trampoline address (it passes the descriptor address
> > instead of function entry address).
> > This fixes it to pass correct trampoline address to __kretprobe_trampoline_handler().
> > This also changes to use correct symbol dereference function to get the
> > function address from the kretprobe_trampoline.
> > 
> > Fixes: e792ff804f49 ("ia64: kprobes: Use generic kretprobe trampoline handler")
> > Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> 
> A better changelog:
> 
>   The following commit:
> 
>      Commit e792ff804f49 ("ia64: kprobes: Use generic kretprobe trampoline handler")
> 
>   Passed the wrong trampoline address to __kretprobe_trampoline_handler(): it
>   passes the descriptor address instead of function entry address.
> 
>   Pass the right parameter.
> 
>   Also use correct symbol dereference function to get the function address
>   from 'kretprobe_trampoline' - an IA64 special.

Thanks for rewriting! OK, I'll update it.

> 
> (Although I realize that much of this goes away just a couple of patches 
> later.)

Yes, but since this is a real bug. I think I should split it for backporting
to stable trees. (Oh, I also forgot to add Cc: stable. Sorry about that.)

Thank you,


-- 
Masami Hiramatsu <mhiramat@...nel.org>