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From: Oleg Nesterov <oleg-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: "Eric W. Biederman" <ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
Cc: Andrew Morton
	<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
	Aleksa Sarai <asarai-IBi9RG/b67k@public.gmane.org>,
	Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>,
	Attila Fazekas <afazekas-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	Jann Horn <jann-XZ1E9jl8jIdeoWH0uzbU5w@public.gmane.org>,
	Kees Cook <keescook-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>,
	Michal Hocko <mhocko-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Ulrich Obergfell
	<uobergfe-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [RFC][PATCH 0/2] exec: Fixing ptrace'd mulit-threaded hang
Date: Sun, 2 Apr 2017 17:38:28 +0200	[thread overview]
Message-ID: <20170402153828.GB12637@redhat.com> (raw)
In-Reply-To: <878tnkpv8h.fsf_-_-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>

On 04/01, Eric W. Biederman wrote:
>
> These patches only handle the case when sighand_struct is not
> shared between different multi-threaded processes.

Ah, I didn't read 0/2 when looked at 2/2, so at least you documented this.

> The general
> case is solvable but that is a quite a bit more code.

I don't think so, please see my reply to 2/2.

Oleg.

  parent reply	other threads:[~2017-04-02 15:38 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20170213141452.GA30203@redhat.com>
     [not found] ` <20170224160354.GA845@redhat.com>
     [not found]   ` <87shmv6ufl.fsf@xmission.com>
     [not found]     ` <20170303173326.GA17899@redhat.com>
     [not found]       ` <20170303173326.GA17899-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-03-03 18:23         ` [PATCH 0/2] fix the traced mt-exec deadlock Eric W. Biederman
2017-03-03 18:59           ` Eric W. Biederman
     [not found]             ` <87d1dyw5iw.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2017-03-03 20:06               ` Eric W. Biederman
     [not found]                 ` <87tw7aunuh.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2017-03-03 20:11                   ` [RFC][PATCH] exec: Don't wait for ptraced threads to be reaped Eric W. Biederman
2017-03-04 17:03                     ` Oleg Nesterov
2017-03-30  8:07                       ` Eric W. Biederman
     [not found]                         ` <8760ir192p.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2017-04-01  5:11                           ` [RFC][PATCH 0/2] exec: Fixing ptrace'd mulit-threaded hang Eric W. Biederman
     [not found]                             ` <878tnkpv8h.fsf_-_-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2017-04-01  5:14                               ` [RFC][PATCH 1/2] sighand: Count each thread group once in sighand_struct Eric W. Biederman
2017-04-01  5:16                               ` [RFC][PATCH 2/2] exec: If possible don't wait for ptraced threads to be reaped Eric W. Biederman
     [not found]                                 ` <87vaqooggs.fsf_-_-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2017-04-02 15:35                                   ` Oleg Nesterov
     [not found]                                     ` <20170402153517.GA12637-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-04-02 18:53                                       ` Eric W. Biederman
     [not found]                                         ` <877f32k5ew.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2017-04-03 18:12                                           ` Oleg Nesterov
2017-04-03 21:04                                             ` Eric W. Biederman
2017-04-05 16:44                                               ` Oleg Nesterov
2017-04-02 15:38                               ` Oleg Nesterov [this message]
2017-04-02 22:50                               ` [RFC][PATCH v2 0/5] exec: Fixing ptrace'd mulit-threaded hang Eric W. Biederman
     [not found]                                 ` <874ly6a0h1.fsf_-_-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2017-04-02 22:51                                   ` [RFC][PATCH v2 1/5] ptrace: Don't wait in PTRACE_O_TRACEEXIT for exec or coredump Eric W. Biederman
2017-04-05 16:19                                     ` Oleg Nesterov
2017-04-02 22:51                                   ` [RFC][PATCH v2 2/5] sighand: Count each thread group once in sighand_struct Eric W. Biederman
2017-04-02 22:52                                   ` [RFC][PATCH v2 3/5] clone: Disallown CLONE_THREAD with a shared sighand_struct Eric W. Biederman
     [not found]                                     ` <87k2728lrp.fsf_-_-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2017-04-05 16:24                                       ` Oleg Nesterov
2017-04-05 17:34                                         ` Eric W. Biederman
2017-04-05 18:11                                           ` Oleg Nesterov
2017-04-02 22:53                                   ` [RFC][PATCH v2 4/5] exec: If possible don't wait for ptraced threads to be reaped Eric W. Biederman
2017-04-05 16:15                                     ` Oleg Nesterov
2017-04-02 22:57                                   ` [RFC][PATCH v2 5/5] signal: Don't allow accessing signal_struct by old threads after exec Eric W. Biederman
     [not found]                                     ` <87zify76z9.fsf_-_-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2017-04-05 16:18                                       ` Oleg Nesterov
     [not found]                                         ` <20170405161812.GD14536-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-04-05 18:16                                           ` Eric W. Biederman
     [not found]                                             ` <87zifu90to.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2017-04-06 15:48                                               ` Oleg Nesterov
2017-04-02 16:15                           ` [RFC][PATCH] exec: Don't wait for ptraced threads to be reaped Oleg Nesterov
     [not found]                             ` <20170402161518.GC12637-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-04-02 21:07                               ` Eric W. Biederman
     [not found]                                 ` <87inmmbjsq.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2017-04-03 18:37                                   ` Oleg Nesterov
     [not found]                                     ` <20170403183728.GB31390-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-04-03 22:49                                       ` Eric W. Biederman
2017-04-03 22:49                                       ` scope of cred_guard_mutex Eric W. Biederman
2017-04-05 16:08                                         ` Oleg Nesterov
2017-04-05 16:11                                           ` Kees Cook
2017-04-05 17:53                                           ` Eric W. Biederman
2017-04-05 18:15                                             ` Oleg Nesterov
     [not found]                                         ` <87fuhpjeco.fsf_-_-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2017-04-06 15:55                                           ` Oleg Nesterov
     [not found]                                             ` <20170406155540.GC7444-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-04-07 22:07                                               ` Kees Cook
2017-09-04  3:19                                   ` [RFC][PATCH] exec: Don't wait for ptraced threads to be reaped Robert O'Callahan
     [not found]           ` <87tw7axlr0.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2017-03-04 16:54             ` [PATCH 0/2] fix the traced mt-exec deadlock Oleg Nesterov

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