From: Kees Cook <kees.cook@canonical.com>
To: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
Alexander Viro <viro@zeniv.linux.org.uk>,
Andrew Morton <akpm@linux-foundation.org>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Neil Horman <nhorman@tuxdriver.com>,
Roland McGrath <roland@redhat.com>, Ingo Molnar <mingo@elte.hu>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH] sanitize task->comm to avoid leaking escape codes
Date: Wed, 23 Jun 2010 14:28:31 -0700 [thread overview]
Message-ID: <20100623212831.GA4809@outflux.net> (raw)
In-Reply-To: <20100623202335.GA4424@x200>
On Wed, Jun 23, 2010 at 11:23:35PM +0300, Alexey Dobriyan wrote:
> On Wed, Jun 23, 2010 at 09:41:45PM +0200, Oleg Nesterov wrote:
> > On 06/23, Kees Cook wrote:
>
> > > -extern char *get_task_comm(char *to, struct task_struct *tsk);
> > > +#define get_task_comm(buf, task) get_task_comm_size(buf, sizeof(buf), task)
> > > +extern char *get_task_comm_size(char *to, size_t len, struct task_struct *tsk);
> >
> > Oh, but this means that get_task_comm(ptr, task) doesn't work?
>
> The number of users is so small, and everyone uses TASK_COMM_LEN,
> so maybe nothing should be done or "char buf[TASK_COMM_LEN]"?
I couldn't handle the pathological use of strncpy(dest, src, sizeof(src))
that is currently in get_task_comm; that's just asking for trouble.
If someone wants to use a ptr for get_task_comm, they would get to call
get_task_comm_size() instead?
-Kees
--
Kees Cook
Ubuntu Security Team
next prev parent reply other threads:[~2010-06-23 21:28 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-23 18:11 [PATCH] sanitize task->comm to avoid leaking escape codes Kees Cook
2010-06-23 19:41 ` Oleg Nesterov
2010-06-23 20:23 ` Alexey Dobriyan
2010-06-23 21:28 ` Kees Cook [this message]
2010-06-28 20:00 ` Andrew Morton
2010-06-28 21:03 ` Kees Cook
2010-06-29 8:45 ` Alexey Dobriyan
2010-06-29 15:09 ` Kees Cook
2010-06-29 18:59 ` Andrew Morton
2010-06-29 19:13 ` Kees Cook
2010-06-29 4:58 ` Artem Bityutskiy
2010-06-29 13:31 ` Oleg Nesterov
2010-06-29 16:23 ` Paul E. McKenney
2010-06-29 17:18 ` Oleg Nesterov
2010-06-29 17:33 ` Paul E. McKenney
2010-06-29 22:32 ` john stultz
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