linux-kernel - Re: [PATCH] coredump: fix pipe coredump when core limit is 0

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Message-ID: <20110826141032.GA13620@redhat.com>
Date:	Fri, 26 Aug 2011 16:10:32 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Pádraig Brady <P@...igBrady.com>
Cc:	Neil Horman <nhorman@...driver.com>,
	Jovi Zhang <bookjovi@...il.com>, dhowells@...hat.com,
	roland@...hat.com, viro@...iv.linux.org.uk,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] coredump: fix pipe coredump when core limit is 0

On 08/26, Pádraig Brady wrote:
>
> On 08/25/2011 04:57 PM, Oleg Nesterov wrote:
> > On 08/24, Neil Horman wrote:
> >>
> >> The long and the short of it is, making RLIMIT_CORE == 0 for the ispipe case
> >> skip the core dump, breaks lots of user space expectations
> >
> > Not sure this really makes sense, but perhaps ispipe can skip the dump
> > if RLIMIT_CORE == 0 _and_ the signal was sent from the user-space.
>
> I like the sound of that, though don't know the details for
> determining signal origin. SIGQUIT generated from a Ctrl-\
> from the tty driver might be problematic for example.

Hmm. Thanks for correcting me.

Indeed, contrary to what I expected tty uses SEND_SIG_PRIV, not
SEND_SIG_NOINFO. This is SI_KERNEL. Hmm. OTOH, this makes sense
from check_kill_permission() pov.

Thanks.

Oleg.

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