linux-kernel - Re: [PATCH] coredump_filter: enable to change the default filter

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]

Date:	Thu, 11 Dec 2008 15:10:03 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	hidehiro.kawai.ez@...achi.com, kosaki.motohiro@...fujitsu.com,
	linux-kernel@...r.kernel.org, roland@...hat.com,
	yumiko.sugita.yf@...achi.com, satoshi.oshima.fk@...achi.com
Subject: Re: [PATCH] coredump_filter: enable to change the default filter

On Thu, 11 Dec 2008 15:46:49 +0900 (JST)
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:

> Hi
> 
> > This patch introduces new kernel parameter `coredump_filter'.
> > Setting a value to this parameter causes the default bitmask
> > of coredump_filter to be changed.
> > 
> > It is useful for users to change coredump_filter settings for
> > the whole system at boot time.  Without this parameter, users
> > have to change coredump_filter settings for each /proc/<pid>/
> > in an initializing script.
> 
> I think this patch only useful on following situation, right?
> 
>   - Administrator can't change rc script.
>   - Administrator can change boot parameter.
> 
> 
> When happen above situation?
> or, you intent to init process debugging?

Yes, this can be implemented in userspace by setting init's filter
before init forks any other processes.

I can understand the practical problems with that form of implementation
however :(


Or does the patch change other behaviour?  Say, when mm_init() is
called by a kernel thread (current->mm==NULL)?  call_usermodehelper(),
for example?

If so, then setting init's filter doesn't cover that case.
--
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/