linux-kernel - [PATCH 0/4] signalfd: a kernel interface for dumping/restoring pending signals

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 for Android: free password hash cracker in your pocket

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

Date:	Mon, 24 Dec 2012 12:13:23 +0400
From:	Andrey Vagin <avagin@...nvz.org>
To:	linux-kernel@...r.kernel.org
Cc:	criu@...nvz.org, linux-fsdevel@...r.kernel.org,
	Andrey Vagin <avagin@...nvz.org>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Pavel Emelyanov <xemul@...allels.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>
Subject: [PATCH 0/4] signalfd: a kernel interface for dumping/restoring pending signals

The idea is simple. We need to get the siginfo for each signal on dump,
and then return it back on restore.

The first problem is that the kernel doesn’t report complete siginfo-s
in user-space. In a signal handler the kernel strips SI_CODE from
siginfo. When a siginfo is received from signalfd, it has a different
format with fixed sizes of fields. The interface of signalfd was
extended. If a signalfd is created with the flag SFD_RAW, it returns
siginfo in a raw format. We need to choose a queue, so two flags
SFD_GROUP and SFD_PRIVATE were added.

rt_sigqueueinfo looks suitable for restoring signals, but it can’t send
siginfo with a positive si_code, because these codes are reserved for
the kernel. In the real world each person has right to do anything with
himself, so I think a process should able to send any siginfo to itself.

Cc: Serge Hallyn <serge.hallyn@...onical.com>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: "Eric W. Biederman" <ebiederm@...ssion.com>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Pavel Emelyanov <xemul@...allels.com>
CC: Cyrill Gorcunov <gorcunov@...nvz.org>

-- 
1.7.11.7

--
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/