linux-kernel - Re: [PATCH] signals: Generate warning when flush_signals() is called from non-kthread context

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20150504173515.GA12200@redhat.com>
Date:	Mon, 4 May 2015 19:35:16 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	NeilBrown <neilb@...e.de>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Evgeniy Polyakov <zbr@...emap.net>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	Alex Williamson <alex.williamson@...hat.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	kvm <kvm@...r.kernel.org>
Subject: Re: [PATCH] signals: Generate warning when flush_signals() is
	called from non-kthread context

On 05/02, NeilBrown wrote:
>
> All the calls in md.c are in a kernel thread so safe, but I'd rather have an
> explicit "uninterruptible, but no load-average" wait....

Could you please explain why md_thread() does allow_signal(SIGKILL) ?

I am just curious. It looks as if we want to allow user-space to "call"
thread->run(), and this looks strange.

Oleg.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/