linux-kernel - Re: Crash when attaching uretprobes to processes running in Docker

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Message-ID: <CAADnVQJjroiR0SRp69f1NbomEH-riw53e_-TioqT4aEt3GSKGg@mail.gmail.com>
Date: Wed, 15 Jan 2025 09:56:08 -0800
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Oleg Nesterov <oleg@...hat.com>
Cc: Jiri Olsa <olsajiri@...il.com>, Eyal Birger <eyal.birger@...il.com>, 
	Aleksa Sarai <cyphar@...har.com>, Masami Hiramatsu <mhiramat@...nel.org>, 
	linux-kernel <linux-kernel@...r.kernel.org>, 
	linux-trace-kernel <linux-trace-kernel@...r.kernel.org>, BPF-dev-list <bpf@...r.kernel.org>, 
	Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>, 
	John Fastabend <john.fastabend@...il.com>, Peter Zijlstra <peterz@...radead.org>, 
	Thomas Gleixner <tglx@...utronix.de>, Borislav Petkov <bp@...en8.de>, X86 ML <x86@...nel.org>, 
	Linux API <linux-api@...r.kernel.org>, Andrii Nakryiko <andrii@...nel.org>, 
	Daniel Borkmann <daniel@...earbox.net>, Alexei Starovoitov <ast@...nel.org>, 
	Andrii Nakryiko <andrii.nakryiko@...il.com>, "rostedt@...dmis.org" <rostedt@...dmis.org>, rafi@....io, 
	Shmulik Ladkani <shmulik.ladkani@...il.com>
Subject: Re: Crash when attaching uretprobes to processes running in Docker

On Wed, Jan 15, 2025 at 7:06 AM Oleg Nesterov <oleg@...hat.com> wrote:
>
> Or we can change __secure_computing() to do nothing if
> this_syscall == __NR_uretprobe.

I think that's the best way forward.
seccomp already allowlists sigreturn syscall.
uretprobe syscall is in the same category.
See __secure_computing_strict.