From: Masami Hiramatsu (Google) <mhiramat@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>, Chris Mason <clm@meta.com>,
Mark Rutland <mark.rutland@arm.com>,
Alexei Starovoitov <alexei.starovoitov@gmail.com>,
Florent Revest <revest@chromium.org>, bpf <bpf@vger.kernel.org>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
KP Singh <kpsingh@kernel.org>,
Brendan Jackman <jackmanb@google.com>,
markowsky@google.com, Masami Hiramatsu <mhiramat@kernel.org>,
Xu Kuohai <xukuohai@huawei.com>,
LKML <linux-kernel@vger.kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Christoph Hellwig <hch@infradead.org>
Subject: Re: [RFC 0/1] BPF tracing for arm64 using fprobe
Date: Mon, 21 Nov 2022 23:40:23 +0900 [thread overview]
Message-ID: <20221121234023.0a8d3a89bf26ad463cf11ad4@kernel.org> (raw)
In-Reply-To: <Y3tOUcOjEDJrm7w6@hirez.programming.kicks-ass.net>
On Mon, 21 Nov 2022 11:09:21 +0100
Peter Zijlstra <peterz@infradead.org> wrote:
> On Fri, Nov 18, 2022 at 01:06:08PM -0500, Steven Rostedt wrote:
> > How do I know that a function return was modified by BPF? If I'm debugging
> > something, is it obvious to the developer that is debugging an issue
> > (perhaps unaware of what BPF programs are loaded on the users machine),
> > that the return of a function was tweaked by BPF and that could be the
> > source of the bug?
>
> Have it taint the kernel if something is overridden ;-) Then we can all
> ignore the report until it comes back without taint.
Hmm, indeed. BTW, error injection should set that too.
Thanks,
--
Masami Hiramatsu (Google) <mhiramat@kernel.org>
next prev parent reply other threads:[~2022-11-21 14:48 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-08 22:06 [RFC 0/1] BPF tracing for arm64 using fprobe Florent Revest
2022-11-08 22:06 ` [RFC 1/1] bpf: Invoke tracing progs using fprobe on archs without direct call Florent Revest
2022-11-17 2:41 ` [RFC 0/1] BPF tracing for arm64 using fprobe Alexei Starovoitov
2022-11-17 13:33 ` Masami Hiramatsu
2022-11-17 16:50 ` Alexei Starovoitov
2022-11-18 16:26 ` Mark Rutland
2022-11-17 17:16 ` Steven Rostedt
2022-11-17 21:55 ` Chris Mason
2022-11-17 22:40 ` Steven Rostedt
2022-11-18 16:34 ` Mark Rutland
2022-11-18 16:45 ` Steven Rostedt
2022-11-18 17:44 ` Chris Mason
2022-11-18 18:06 ` Steven Rostedt
2022-11-18 18:52 ` Chris Mason
2022-11-21 13:47 ` KP Singh
2022-11-21 14:16 ` Peter Zijlstra
2022-11-21 14:23 ` KP Singh
2022-11-21 15:15 ` Steven Rostedt
2022-11-21 15:29 ` KP Singh
2022-11-21 15:39 ` Steven Rostedt
2022-11-21 16:16 ` Jiri Kosina
2022-11-21 15:40 ` Alexei Starovoitov
2022-11-21 15:45 ` Steven Rostedt
2022-11-21 15:55 ` Borislav Petkov
2022-11-21 10:09 ` Peter Zijlstra
2022-11-21 14:40 ` Masami Hiramatsu [this message]
2022-11-18 16:18 ` Mark Rutland
2022-11-17 13:16 ` Masami Hiramatsu
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