linux-kernel - Re: [for-next][PATCH 14/15] tracepoint: Do not fail unregistering a probe due to memory failure

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Message-ID: <YBrXvQHJX1HXLvdf@hirez.programming.kicks-ass.net>
Date:   Wed, 3 Feb 2021 18:05:01 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Ingo Molnar <mingo@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        netdev <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>,
        Florian Weimer <fw@...eb.enyo.de>,
        syzbot+83aa762ef23b6f0d1991@...kaller.appspotmail.com,
        syzbot+d29e58bb557324e55e5e@...kaller.appspotmail.com,
        Matt Mullins <mmullins@...x.us>
Subject: Re: [for-next][PATCH 14/15] tracepoint: Do not fail unregistering a
 probe due to memory failure

On Wed, Feb 03, 2021 at 11:05:31AM -0500, Steven Rostedt wrote:
> [ Note, this version does use undefined compiler behavior (assuming that
>   a stub function with no parameters or return, can be called by a location
>   that thinks it has parameters but still no return value. Static calls
>   do the same thing, so this trick is not without precedent.

Specifically it relies on the C ABI being caller cleanup. CDECL is that.