From: Kees Cook <keescook@chromium.org>
To: Nick Bowler <nbowler@elliptictech.com>
Cc: linux-kernel@vger.kernel.org,
Alexander Viro <viro@zeniv.linux.org.uk>,
Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@linux-foundation.org>,
Rik van Riel <riel@redhat.com>,
Federica Teodori <federica.teodori@googlemail.com>,
Lucian Adrian Grijincu <lucian.grijincu@gmail.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Eric Paris <eparis@redhat.com>,
Randy Dunlap <rdunlap@xenotime.net>,
Dan Rosenberg <drosenberg@vsecurity.com>,
linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org,
kernel-hardening@lists.openwall.com
Subject: Re: [PATCH v2012.1] fs: symlink restrictions on sticky directories
Date: Thu, 5 Jan 2012 11:34:43 -0800 [thread overview]
Message-ID: <CAGXu5jLYhxOK8u-H8mhTvHBzvkRi8d-=zTeginjukDMEFri-0Q@mail.gmail.com> (raw)
In-Reply-To: <20120105143008.GA31728@elliptictech.com>
On Thu, Jan 5, 2012 at 6:30 AM, Nick Bowler <nbowler@elliptictech.com> wrote:
> On 2012-01-04 12:18 -0800, Kees Cook wrote:
>> diff --git a/fs/Kconfig b/fs/Kconfig
>> index 5f4c45d..26ede24 100644
>> --- a/fs/Kconfig
>> +++ b/fs/Kconfig
>> @@ -278,3 +278,19 @@ source "fs/nls/Kconfig"
>> source "fs/dlm/Kconfig"
>>
>> endmenu
>> +
>> +config PROTECTED_STICKY_SYMLINKS
>> + bool "Protect symlink following in sticky world-writable directories"
>> + default y
> [...]
>
> Why do we need a config option for this? What's wrong with just using
> the sysctl?
This way the sysctl can configured directly without needing to have a
distro add a new item to sysctl.conf.
> Why have you made this option "default y", when enabling it clearly
> makes user-visible changes to kernel behaviour?
Ingo specifically asked me to make it "default y".
-Kees
--
Kees Cook
ChromeOS Security
next prev parent reply other threads:[~2012-01-05 19:35 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-04 20:18 [PATCH v2012.1] fs: symlink restrictions on sticky directories Kees Cook
2012-01-05 9:17 ` Ingo Molnar
2012-01-05 19:36 ` Kees Cook
2012-01-06 7:36 ` Ingo Molnar
2012-01-06 9:21 ` Andrew Morton
2012-01-06 9:43 ` Ingo Molnar
2012-01-06 9:58 ` Andrew Morton
2012-01-06 10:05 ` Ingo Molnar
2012-01-06 10:33 ` Andrew Morton
2012-01-06 11:16 ` Ingo Molnar
2012-01-06 18:34 ` Kees Cook
2012-01-06 18:44 ` Kees Cook
2012-01-05 14:30 ` Nick Bowler
2012-01-05 19:34 ` Kees Cook [this message]
2012-01-05 20:08 ` Nick Bowler
2012-01-05 20:55 ` Kees Cook
2012-01-05 22:18 ` Nick Bowler
2012-01-06 0:08 ` Kees Cook
2012-01-06 2:05 ` Rik van Riel
2012-01-06 7:34 ` Ingo Molnar
2012-01-06 7:10 ` Ingo Molnar
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