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From: Josh Poimboeuf <jpoimboe@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Miroslav Benes <mbenes@suse.cz>,
	Greg KH <gregkh@linuxfoundation.org>,
	Luis Chamberlain <mcgrof@kernel.org>,
	mbenes@suse.com, Minchan Kim <minchan@kernel.org>,
	keescook@chromium.org, dhowells@redhat.com, hch@infradead.org,
	ngupta@vflare.org, sergey.senozhatsky.work@gmail.com,
	axboe@kernel.dk, linux-block@vger.kernel.org,
	linux-kernel@vger.kernel.org, live-patching@vger.kernel.org,
	Jessica Yu <jeyu@kernel.org>
Subject: Re: [PATCH 1/2] zram: fix crashes due to use of cpu hotplug multistate
Date: Wed, 7 Apr 2021 10:30:31 -0500	[thread overview]
Message-ID: <20210407153031.m4gg3rsgwlr432ba@treble> (raw)
In-Reply-To: <YG29KAuOHbJd3Bll@hirez.programming.kicks-ass.net>

On Wed, Apr 07, 2021 at 04:09:44PM +0200, Peter Zijlstra wrote:
> On Tue, Apr 06, 2021 at 10:54:23AM -0500, Josh Poimboeuf wrote:
> 
> > Same for Red Hat.  Unloading livepatch modules seems to work fine, but
> > isn't officially supported.
> > 
> > That said, if rmmod is just considered a development aid, and we're
> > going to be ignoring bugs, we should make it official with a new
> > TAINT_RMMOD.
> 
> Another option would be to have live-patch modules leak a module
> reference by default, except when some debug sysctl is set or something.
> Then only those LP modules loaded while the sysctl is set to 'YOLO' can
> be unloaded.

The issue is broader than just live patching.

My suggestion was that if we aren't going to fix bugs in kernel module
unloading, then unloading modules shouldn't be supported, and should
taint the kernel.

-- 
Josh


  reply	other threads:[~2021-04-07 15:38 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-06  2:20 [PATCH 0/2] zram: fix few ltp zram02.sh crashes Luis Chamberlain
2021-03-06  2:20 ` [PATCH 1/2] zram: fix crashes due to use of cpu hotplug multistate Luis Chamberlain
2021-03-09  2:55   ` Minchan Kim
2021-03-10 13:11     ` Luis Chamberlain
2021-03-10 21:25       ` Luis Chamberlain
2021-03-12  2:08       ` Minchan Kim
2021-03-10 21:21     ` Luis Chamberlain
2021-03-12  2:14       ` Minchan Kim
2021-03-12 18:32         ` Luis Chamberlain
2021-03-12 19:28           ` Minchan Kim
2021-03-19 19:09             ` Luis Chamberlain
2021-03-22 16:37               ` Minchan Kim
2021-03-22 20:41                 ` Luis Chamberlain
2021-03-22 22:12                   ` Minchan Kim
2021-04-01 23:59                     ` Luis Chamberlain
2021-04-02  7:54                       ` Greg KH
2021-04-02 18:30                         ` Luis Chamberlain
2021-04-03  6:13                           ` Greg KH
     [not found]                             ` <20210406003152.GZ4332@42.do-not-panic.com>
2021-04-06 12:00                               ` Miroslav Benes
2021-04-06 15:54                                 ` Josh Poimboeuf
2021-04-07 14:09                                   ` Peter Zijlstra
2021-04-07 15:30                                     ` Josh Poimboeuf [this message]
2021-04-07 16:48                                       ` Peter Zijlstra
2021-04-07 20:17                         ` Josh Poimboeuf
2021-04-08  6:18                           ` Greg KH
2021-04-08 13:16                             ` Steven Rostedt
2021-04-08 13:37                             ` Josh Poimboeuf
2021-04-08  1:37                         ` Thomas Gleixner
2021-04-08  6:16                           ` Greg KH
2021-04-08  8:01                             ` Jiri Kosina
2021-04-08  8:09                               ` Greg KH
2021-04-08  8:35                                 ` Jiri Kosina
2021-04-08  8:55                                   ` Greg KH
2021-04-08 18:40                                     ` Luis Chamberlain
2021-04-09  3:01                                     ` Kees Cook
2021-04-05 17:07                       ` Minchan Kim
2021-04-05 19:00                         ` Luis Chamberlain
2021-04-05 19:58                           ` Minchan Kim
2021-04-06  0:29                             ` Luis Chamberlain
2021-04-07  1:23                               ` Minchan Kim
2021-04-07  1:38                                 ` Minchan Kim
2021-04-07 14:52                                   ` Luis Chamberlain
2021-04-07 14:50                                 ` Luis Chamberlain
2021-03-06  2:20 ` [PATCH 2/2] zram: fix races of sysfs attribute removal and usage Luis Chamberlain

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