linux-kernel - [RFC PATCH 0/3] mt-exec: fix deadlock with ptrace

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Message-ID: <aRDL3HOB21pMVMWC@redhat.com>
Date: Sun, 9 Nov 2025 18:14:04 +0100
From: Oleg Nesterov <oleg@...hat.com>
To: Bernd Edlinger <bernd.edlinger@...mail.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dmitry Levin <ldv@...ace.io>
Cc: Alexander Viro <viro@...iv.linux.org.uk>,
	Alexey Dobriyan <adobriyan@...il.com>, Kees Cook <kees@...nel.org>,
	Andy Lutomirski <luto@...capital.net>,
	Will Drewry <wad@...omium.org>,
	Christian Brauner <brauner@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Hocko <mhocko@...e.com>, Serge Hallyn <serge@...lyn.com>,
	James Morris <jamorris@...ux.microsoft.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Yafang Shao <laoar.shao@...il.com>, Helge Deller <deller@....de>,
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	Adrian Reber <areber@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>, Jens Axboe <axboe@...nel.dk>,
	Alexei Starovoitov <ast@...nel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-kselftest@...r.kernel.org, linux-mm@...ck.org,
	linux-security-module@...r.kernel.org,
	tiozhang <tiozhang@...iglobal.com>,
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	Stefan Roesch <shr@...kernel.io>, Chao Yu <chao@...nel.org>,
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	David Windsor <dwindsor@...il.com>,
	Mateusz Guzik <mjguzik@...il.com>, Ard Biesheuvel <ardb@...nel.org>,
	"Joel Fernandes (Google)" <joel@...lfernandes.org>,
	"Matthew Wilcox (Oracle)" <willy@...radead.org>,
	Hans Liljestrand <ishkamiel@...il.com>,
	Penglei Jiang <superman.xpt@...il.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Adrian Ratiu <adrian.ratiu@...labora.com>,
	Ingo Molnar <mingo@...nel.org>,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Eric Dumazet <edumazet@...gle.com>
Subject: [RFC PATCH 0/3] mt-exec: fix deadlock with ptrace_attach()

Not for inclusion yet. 2/2 is untested, incomplete, possibly buggy.

But could you review at least the intent? Do you see any problem with
this approach?

This problem is very, very old. It seems that nobody can suggest a
simple/clean fix...

Oleg.
---

 fs/binfmt_elf.c         |   4 +-
 fs/binfmt_elf_fdpic.c   |   4 +-
 fs/binfmt_flat.c        |   4 +-
 fs/exec.c               | 142 +++++++++++++++++++++++-------------------------
 include/linux/binfmts.h |   2 +-
 kernel/exit.c           |   9 +--
 kernel/signal.c         |   6 +-
 7 files changed, 87 insertions(+), 84 deletions(-)