linux-kernel - [PATCH 0/2] wait/ptrace: always assume _

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Date:	Tue, 20 Oct 2015 19:17:40 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Dmitry Vyukov <dvyukov@...gle.com>
Cc:	Alexander Potapenko <glider@...gle.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Jan Kratochvil <jan.kratochvil@...hat.com>,
	Julien Tinnes <jln@...gle.com>,
	Kees Cook <keescook@...gle.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
	Pedro Alves <palves@...hat.com>,
	Robert Swiecki <swiecki@...gle.com>,
	Roland McGrath <roland@...k.frob.com>,
	syzkaller@...glegroups.com, linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] wait/ptrace: always assume __WALL if the child is
	traced

Damn. I simply do not know what should/can we do. From the change
log:

	And I can only hope that this won't break something.

yet this patch cc's -stable.

Please see the changelog, but in short: this is not a kernel bug
but unlikely we can fix all distributions, so I think we have to
change the kernel.

HOWEVER. With this change __WCLONE and __WALL have no effect for
debugger, do_wait() works as if __WALL is set if the child (natural
or not) is traced.

Jan, Pedro, could you please confirm this won't break gdb? I tried
to look into gdb-7.1, and at first glance gdb uses __WCLONE only
because __WALL doesn't work on older kernels, iow it seems to me
that gdb actually wants __WALL so this change should be fine.

Any other ideas?

Oleg.

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