From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Jiri Olsa <olsajiri@gmail.com>, Aleksa Sarai <cyphar@cyphar.com>,
Eyal Birger <eyal.birger@gmail.com>,
mhiramat@kernel.org, linux-kernel <linux-kernel@vger.kernel.org>,
linux-trace-kernel@vger.kernel.org,
BPF-dev-list <bpf@vger.kernel.org>,
Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
peterz@infradead.org, tglx@linutronix.de, bp@alien8.de,
x86@kernel.org, linux-api@vger.kernel.org,
Andrii Nakryiko <andrii@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Alexei Starovoitov <ast@kernel.org>,
"rostedt@goodmis.org" <rostedt@goodmis.org>,
rafi@rbk.io, Shmulik Ladkani <shmulik.ladkani@gmail.com>
Subject: Re: Crash when attaching uretprobes to processes running in Docker
Date: Tue, 14 Jan 2025 13:45:11 -0800 [thread overview]
Message-ID: <CAEf4BzaRCzWMVvyGC_T52djF7q65yM8=AdBEMOPUU8edG-PLxg@mail.gmail.com> (raw)
In-Reply-To: <20250114203922.GA5051@redhat.com>
On Tue, Jan 14, 2025 at 12:40 PM Oleg Nesterov <oleg@redhat.com> wrote:
>
> On 01/14, Andrii Nakryiko wrote:
> >
> > Should we just fix whoever is blocking kernel-internal special syscall
> > (sys_uretprobe)?
>
> Well, we can add __NR_uretprobe to mode1_syscalls[] but this won't
> really help.
>
> We can't "fix" the existing user-space setups which can nack any
> "unnecessary/unknown" syscall.
>
> > What would happen if someone blocked that other
> > special kernel-internal syscall for signal handling (can't remember
> > the name,
>
> sys_rt_sigreturn().
>
> Yes, the task will crash after return from the signal handler if this
> syscall is filtered out.
>
> But, unlike sys_uretprobe(), sys_rt_sigreturn() is old, so the existing
> setups must know that sigreturn() should be respected...
someday sys_uretprobe will be old as well ;) FWIW, systemd allowlisted
sys_uretprobe, see [0]
[0] https://github.com/systemd/systemd/issues/34615#issuecomment-2406761451
>
> Oleg.
>
>
next prev parent reply other threads:[~2025-01-14 21:45 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-01-10 15:12 Crash when attaching uretprobes to processes running in Docker Eyal Birger
2025-01-10 15:25 ` Aleksa Sarai
2025-01-11 18:40 ` Jiri Olsa
2025-01-14 9:22 ` Jiri Olsa
2025-01-14 10:05 ` Masami Hiramatsu
2025-01-14 11:21 ` Oleg Nesterov
2025-01-14 14:21 ` Jiri Olsa
2025-01-17 1:23 ` Masami Hiramatsu
2025-01-17 1:57 ` Oleg Nesterov
2025-01-14 10:42 ` Peter Zijlstra
2025-01-14 11:01 ` Oleg Nesterov
2025-01-14 12:02 ` Peter Zijlstra
2025-01-14 12:32 ` Oleg Nesterov
2025-01-14 14:07 ` Peter Zijlstra
2025-01-14 17:43 ` Oleg Nesterov
2025-01-14 10:58 ` Oleg Nesterov
2025-01-14 14:19 ` Jiri Olsa
2025-01-14 19:21 ` Andrii Nakryiko
2025-01-14 20:39 ` Oleg Nesterov
2025-01-14 21:45 ` Andrii Nakryiko [this message]
2025-01-14 22:10 ` Oleg Nesterov
2025-01-14 23:52 ` Andrii Nakryiko
2025-01-15 0:09 ` Eyal Birger
2025-01-15 0:50 ` Oleg Nesterov
2025-01-15 5:45 ` Shmulik Ladkani
2025-01-15 15:51 ` Oleg Nesterov
2025-01-17 11:41 ` Peter Zijlstra
2025-01-17 17:53 ` Andrii Nakryiko
2025-01-14 14:08 ` Eyal Birger
2025-01-14 14:33 ` Oleg Nesterov
2025-01-14 14:56 ` Jiri Olsa
2025-01-14 17:25 ` Oleg Nesterov
2025-01-15 9:36 ` Jiri Olsa
2025-01-15 13:24 ` Eyal Birger
2025-01-15 13:25 ` Jiri Olsa
2025-01-15 15:06 ` Oleg Nesterov
2025-01-15 17:56 ` Alexei Starovoitov
2025-01-15 18:20 ` Andrii Nakryiko
2025-01-15 18:40 ` Oleg Nesterov
2025-01-15 18:48 ` Eyal Birger
2025-01-15 19:03 ` Oleg Nesterov
2025-01-15 21:14 ` Eyal Birger
2025-01-16 14:39 ` Oleg Nesterov
2025-01-16 14:47 ` Eyal Birger
2025-01-16 15:31 ` Oleg Nesterov
2025-01-16 17:11 ` Eyal Birger
2025-01-17 0:48 ` Oleg Nesterov
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