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From: Andrew Morton <akpm@linux-foundation.org>
To: Bernd Edlinger <bernd.edlinger@hotmail.de>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>,
	Alexey Dobriyan <adobriyan@gmail.com>,
	Oleg Nesterov <oleg@redhat.com>,
	Kees Cook <keescook@chromium.org>,
	Andy Lutomirski <luto@amacapital.net>,
	Will Drewry <wad@chromium.org>, Shuah Khan <shuah@kernel.org>,
	Christian Brauner <christian.brauner@ubuntu.com>,
	Michal Hocko <mhocko@suse.com>, Serge Hallyn <serge@hallyn.com>,
	James Morris <jamorris@linux.microsoft.com>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	Charles Haithcock <chaithco@redhat.com>,
	Suren Baghdasaryan <surenb@google.com>,
	Yafang Shao <laoar.shao@gmail.com>, Helge Deller <deller@gmx.de>,
	YiFei Zhu <yifeifz2@illinois.edu>,
	Adrian Reber <areber@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Jens Axboe <axboe@kernel.dk>,
	"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	linux-kselftest@vger.kernel.org
Subject: Re: [PATCHv8] exec: Fix dead-lock in de_thread with ptrace_attach
Date: Thu, 10 Jun 2021 14:36:42 -0700	[thread overview]
Message-ID: <20210610143642.e4535dbdc0db0b1bd3ee5367@linux-foundation.org> (raw)
In-Reply-To: <AM8PR10MB4708AFBD838138A84CE89EF8E4359@AM8PR10MB4708.EURPRD10.PROD.OUTLOOK.COM>

On Thu, 10 Jun 2021 09:31:42 +0200 Bernd Edlinger <bernd.edlinger@hotmail.de> wrote:

> This introduces signal->unsafe_execve_in_progress,
> which is used to fix the case when at least one of the
> sibling threads is traced, and therefore the trace
> process may dead-lock in ptrace_attach, but de_thread
> will need to wait for the tracer to continue execution.

Deadlocks are serious.  Is this exploitable by unprivileged userspace?

> Signed-off-by: Bernd Edlinger <bernd.edlinger@hotmail.de>

Was a -stable backport considered?



  reply	other threads:[~2021-06-10 21:36 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-10  7:31 [PATCHv8] exec: Fix dead-lock in de_thread with ptrace_attach Bernd Edlinger
2021-06-10 21:36 ` Andrew Morton [this message]
2021-06-11  4:42   ` Bernd Edlinger
2021-06-11 15:55   ` [PATCH v9] " Bernd Edlinger
2021-06-11 23:16     ` Andrew Morton
2021-06-12  5:22       ` Bernd Edlinger
2021-06-12  7:02     ` Greg KH
2021-06-14 16:42     ` Eric W. Biederman
2021-06-15 14:26       ` Bernd Edlinger
2021-06-16 21:31         ` Bernd Edlinger
2021-06-22  5:10           ` Bernd Edlinger
2021-06-12 19:44   ` [PATCHv8] " Eric W. Biederman
2021-06-11  7:54 ` Bernd Edlinger
2021-06-11 23:15 ` Andrew Morton

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